JP2000035517A - Optical transmitter, optical transmitter array, image sensor, lens plate, and image forming apparatus - Google Patents

Abstract

(57) [Problem] To provide an optical transmitter capable of transmitting an image with less bleeding due to chromatic aberration and having a large difference in refractive index between a central portion and an outer peripheral portion. SOLUTION: A columnar optical transmission body having a radius R whose refractive index continuously decreases from a center toward an outer peripheral portion. 0-0.
Within the range of 8R, the difference in Abbe number between the site having the highest Abbe number and the site having the lowest Abbe number is 2 or less, and (A) methyl methacrylate, (B) an alicyclic group-containing (meth) acrylate and / or t- Butyl methacrylate and (C) fluorinated alkyl methacrylate are contained in at least one polymer among a plurality of polymers.
A polymer containing a fluorinated alkyl methacrylate is contained within a predetermined range set to 0.5 R to R from the center. The content of the fluorinated alkyl methacrylate in the entire polymer in the range of 0.99 R to R from the center is 20 to 60% by weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission technique among optical techniques, and more particularly to an optical transmission element made of plastic, and an optical transmission element array, an image sensor, a lens plate, and an image forming apparatus using the same. Related to the device.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 47-816 has already proposed a glass optical transmission body having a continuous refractive index distribution inside. A product made of a synthetic resin is proposed in Japanese Patent Publication No. 47-28059.
After that, optical transmission bodies made of glass or synthetic resin obtained by various methods have been proposed. Generally, this refractive index distribution type optical transmission body is mirror-polished so that both end faces thereof are parallel planes perpendicular to the central axis of the transmission body, and is used as a single lens as a single lens. In addition, a large number of them are arranged in an array so as to be parallel to each other and bonded and integrated to form a lens array in combination with a line sensor such as a copier, a facsimile, a scanner, or a writing device of an LED printer. Widely used to do. Also, a large number of them are arranged in a plane so as to be parallel to each other to form a plate-shaped lens assembly (lens plate) as a component of a device for reading, transmitting or displaying two-dimensional image information. Used. In a specific application, one or both end faces of the optical transmission body are formed into a spherical shape having a slight curvature.

[0003]

Although these conventional refractive index distribution type optical transmission bodies have excellent image transmission characteristics, the change in Abbe number from the central axis to the outer peripheral portion is large.
All had large chromatic aberrations. Japanese Patent Publication No. 57-59241 discloses a method of manufacturing a synthetic resin optical transmission body having small chromatic aberration. Even in the optical transmission body obtained by this manufacturing method, the difference in Abbe number between the central axis and the outer peripheral portion is as large as 10 or more, and bleeding or spots due to chromatic aberration have occurred in a transmitted image. Further, Japanese Unexamined Patent Publication No.
Japanese Patent No. 35929 discloses a graded-index optical transmitter in which the difference in Abbe number between the center and the outer periphery is 2 or less. Although this optical transmission body had little blurring or spots on the image to be transmitted, only a small difference in refractive index between the center and the outer periphery was obtained.

On the other hand, in a refractive index distribution type lens (optical transmitter) and a lens array (optical transmitter array) having small chromatic aberration, a lens having high resolution and excellent optical characteristics is required. So-called flare light and crosstalk light pose a problem in obtaining good image contrast.

In a gradient index lens, light rays incident from one end face travel in a sine curve in the lens and exit from the other end face to form an image. In general, however, the refractive index distribution in the lens is not always necessary. It does not correspond to the ideal distribution. In particular, it deviates from the ideal distribution in the vicinity of the outer periphery, and due to distortion of the refractive index distribution near this outer periphery and external light entering the lens through the lens side peripheral surface, an image called flare light is formed around the lens. Blurry light that does not contribute is generated. The flare light adversely affects the resolution of the lens and the contrast of the image. Further, in a lens array, light that cross-talks between adjacent lenses adversely affects the resolution of the lens array.

[0006]

Accordingly, the present inventors have studied to develop an optical transmission body which can transmit an image with less bleeding due to chromatic aberration and has a large difference in the refractive index between the central portion and the outer peripheral portion. Have reached the present invention.

According to the present invention, there is provided a columnar optical transmitter having a radius R whose refractive index continuously decreases from the center to the outer peripheral portion, which is composed of a plurality of kinds of polymers, The difference in Abbe number between the site having the highest Abbe number and the site having the lowest Abbe number in the range of 0 to 0.8R toward the outer peripheral portion is 2 or less, and (A) methyl methacrylate, (B) alicyclic group-containing ( Meth) acrylate and / or t-butyl methacrylate, and (C) fluorinated alkyl methacrylate are each contained in at least one of the plurality of polymers, and contain the fluorinated alkyl methacrylate. An optical transmitter characterized in that the polymer is contained within a predetermined range set to 0.5R from the center and outside the center.

In one embodiment of the present invention, the distance from the center is 0.1 mm.
The content of the fluorinated alkyl methacrylate in the entire polymer in the range of 5R to 0.8R is 0 to 20% by weight.

In one embodiment of the present invention, the distance from the center is 0.1 mm.
The content of the fluorinated alkyl methacrylate in the entire polymer in the range of 99R to R is 20 to 60% by weight.

In one embodiment of the present invention, the alicyclic group of the alicyclic group-containing (meth) acrylate is tricyclo [5
· 2 · 1 · 0 ^2,6] decanyl group is any one of the adamantyl group and an isobornyl group.

In one embodiment of the present invention, the fluorinated alkyl methacrylate is 2,2,3,3,4,4,
One of 5,5-octafluoropentyl methacrylate and 2,2,3,3-tetrafluoropropyl methacrylate.

In one embodiment of the present invention, a light-absorbent mixed layer in which the light-absorbent is almost uniformly mixed is formed in a portion within 100 μm from the outer peripheral surface toward the center.

In one embodiment of the present invention, the light-absorbing agent-mixed layer is formed with N layers (N ≧ 2), and is an n-th layer (n = 1, 2,...) From the center toward the outer periphery. ..., when the concentration of the light absorbing agent in the light absorber mixed layer of n) and d _n, for n other than 1 is d _n> d _n-1.

In one embodiment of the present invention, the light-absorbing agent-mixed layer is formed of N layers (N ≧ 2), and is an n-th layer (n = 1, 2,...) From the center toward the outer periphery. ..., when the absorbance at a specific wavelength in the light absorbing agent mixed layer of n) and a _n, for n other than 1 is a _n> a _n-1.

Further, according to the present invention, a plurality of light transmitting bodies as described above are arranged in a line in one direction crossing the central axis of the light transmitting bodies so as to be parallel to each other. An optical transmitter array having at least one transmitter array is provided.

According to the present invention, there is also provided an image sensor comprising the above-described optical transmitter array and a sensor on which an image is formed by the optical transmitter array.
Is provided. .

Further, according to the present invention, d _n ≧ 5d _n-1
Alternatively, a plurality of the optical transmission members satisfying A _n ≧ 5A _n-1 are closely adhered so as to be parallel to each other and are arranged in a plane in a direction crossing the direction of the central axis of the optical transmission members. A lens plate.

According to the present invention, there is provided an image forming apparatus including the above-described lens plate, an image light source, and a screen on which an image of the image light source is projected by the lens plate. Provided.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of an optical transmitter, an optical transmitter array, an image sensor, a lens plate and an image forming apparatus according to the present invention.

FIGS. 1 and 2 are cross-sectional views of a plastic optical transmission body according to an embodiment of the present invention, taken along a plane perpendicular to the central axis. The optical transmitter 1 is a columnar optical transmitter having a radius R whose refractive index continuously decreases from the central axis 4 toward the outer peripheral surface.
(Ie, within the range of 0 to 0.8R in the radial direction from the central axis of the optical transmission body toward the outer peripheral surface) [X + Y], the difference between the Abbe number between the highest Abbe number and the lowest Abbe number is 2
It is as follows.

The monomers constituting the polymer used in the light transmitting body 1 are represented by the following (A), (B) and (C): (A) methyl methacrylate, (B) alicyclic group-containing (A) (Meth) acrylate and / or t-butyl methacrylate, (C) fluorinated alkyl methacrylate.

From the center of the optical transmission body 1 toward the outer periphery,
As a monomer constituting the plastic (polymer) used in the range [X + Y] of 0.8R, it is preferable to use two or more monomers having a difference in Abbe number of a homopolymer of 2 or less, and mainly It is preferable to configure the above (A) and (B). The total content of (A) and (B) in the entire polymer in the range of 0 to 0.8R is 90 to 100.
% By weight. As the two kinds of monomers (B), both may be used, or only one of them may be used.
With this configuration, the Abbe number of polymethyl methacrylate, which is a polymer of methyl methacrylate, is 55, the Abbe number of a homopolymer of an alicyclic group-containing (meth) acrylate is around 53 to 55, and t-butyl is used. Since the Abbe number of the homopolymer of methacrylate is 55, the difference in Abbe number of the polymer can be set to 2 or less in the range of 0 to 0.8R from the center of the optical transmission body toward the outer periphery. Since the difference in Abbe number between the highest Abbe number and the lowest Abbe number in the range of 0 to 0.8R from the center toward the outer peripheral portion is 0 or less, the chromatic aberration is very small. Has features.

As the alicyclic group of the alicyclic group-containing (meth) acrylate, a tricyclo [ ^5.2.1.02,6 ] decanyl group, an adamantyl group and an isobornyl group are preferably used.

In the optical transmitter according to the present invention, in order to increase the difference in the refractive index between the center and the outer peripheral portion and to improve the refractive index distribution near the outer peripheral portion of the optical transmitter, the outer peripheral portion of the optical transmitter 1 is improved. (C) fluorinated alkyl methacrylate is used. The fluorinated alkyl methacrylate has a sufficiently low refractive index, and when used together with (A) and / or (B), a highly transparent polymer can be obtained. A fluorinated alkyl methacrylate is contained in a predetermined range set within a range [Y + Z + W] of 0.5R to R from the center,
In particular, in the range [Y] of 0.5R to 0.8R, it is preferable that the content of the fluorinated alkyl methacrylate in the whole polymer is 0 to 20% by weight,
In the range [W] of 0.99R to R, the content of the fluorinated alkyl methacrylate in the entire polymer is from 20 to
Preferably, it is 60% by weight. The predetermined range in which the fluorinated alkyl methacrylate is contained is appropriately set depending on the content thereof, the performance required for the optical transmitter, and the like. It is preferable to set so as to include the range of 8R to R.

That is, by including a fluorinated alkyl methacrylate having a low refractive index in the outer peripheral portion of the optical transmission body 1, the refractive index distribution in the outer peripheral portion is improved, and the refractive index difference is increased to increase the refractive index distribution constant g. By increasing the value of, an optical transmitter having a short conjugate length can be obtained. However, on the other hand, the fluorinated alkyl methacrylate has a large Abbe number (the Abbe number of polymethyl methacrylate PMMA is 55).
On the other hand, the Abbe number of a homopolymer of octafluoropentyl methacrylate is 66), and when it is contained, the difference in the Abbe number in the optical transmission body 1 increases, and chromatic aberration tends to deteriorate. Here, the effect of the difference in Abbe number on the chromatic aberration is greater nearer the center of the optical transmission body 1 and the effect is smaller as it is closer to the outer periphery, so that the fluorinated alkyl methacrylate is contained in a range closer to the outer periphery. (That is, it is contained in a predetermined range including 0.5R and outside 0.5R, and is not substantially contained inside 0.5R). Since it is preferable to reduce the difference in Abbe number nearer the center of the optical transmission body 1, the content of the fluorinated alkyl methacrylate in the range of 0.5R to 0.8R is relatively small as described above (preferably 0-20% by weight)
In the range of 0.99R to R, the influence of the Abbe number difference on the chromatic aberration is considerably small, so that the fluorination is relatively large (preferably 20 to 60% by weight) as described above to improve the refractive index distribution. Contains alkyl methacrylate.
In the range of 0.8R to 0.99R, 0.5R to 0.8R
And an intermediate content between 0.99R and R.

If the difference in the refractive index between the central portion and the outer peripheral portion is small, the conjugate length becomes long, and the size of the optical system when configuring an imaging optical system as an optical transmission body array is undesirably increased. Further, when fluorinated alkyl methacrylate is not used, the refractive index distribution near the outer peripheral portion is poor, so that flare light and crosstalk light increase, and the performance of the optical transmission body decreases due to the influence.

Examples of the fluorinated alkyl methacrylate include 2,2,2-trifluoroethyl methacrylate, 2,2,3,
3-tetrafluoropropyl methacrylate, 2,2,3,3,3-
Pentafluoropropyl methacrylate, 1-trifluoromethyl-2,2,2-trifluoroethyl methacrylate,
2,2,3,3,4,4,5,5-octafluoropentyl methacrylate, 2,2,3,3,4,4-hexafluorobutyl methacrylate and the like can be mentioned. As the fluorinated alkyl methacrylate, it is particularly preferable to use any of 2,2,3,3-tetrafluoropropyl methacrylate and 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate.

In order to prepare a refractive index distribution type optical transmitter using the above-mentioned monomers, a copolymer of these monomers or a mixture of the polymers can be used.

In preparing the graded index optical transmission body of the present invention, in addition to the above-mentioned monomers, the resulting optical transmission body has reduced transparency, reduced refractive index difference, and 0 to 0.8R. Other monomers can also be used in a range that does not substantially increase the Abbe number difference in the range.

The graded-index plastic optical transmission body of the present invention has a quadratic curve-shaped refractive index distribution that decreases almost in proportion to the square of the distance from the center to the outer periphery. Image transmission can be performed.

Further, in the optical transmission body of the present invention, the difference in Abbe number between the highest Abbe number and the lowest Abbe number in the range of 0 to 0.8R from the center to the outer peripheral portion is 2 or less. The transmitted image has an advantage that blurring due to the magnitude of chromatic aberration is small. Further, since the difference in the refractive index between the central portion and the outer peripheral portion of the optical transmission body can be increased, the optical system can be made compact. Further, the optical performance is high because the refractive index distribution near the outer peripheral portion is good.

The optical transmitter according to the present invention reduces the flare light generated by the irregular portion of the refractive index distribution slightly existing in the vicinity of the outer periphery of the optical transmitter described above. In order to reduce the crosstalk light, the light absorber can be almost uniformly mixed in a predetermined radial direction range.

In the light transmitting body of the present invention, the light absorbing agent is mixed in a predetermined range within 100 μm from the outer peripheral surface. This range includes portions where the refractive index distribution at the outer peripheral portion becomes irregular when manufactured by a conventional method. The portion to which the light absorber is added may include not only a portion having an irregular refractive index distribution at the outer peripheral portion but also a portion having a good refractive index distribution. The part to which the light absorber is added is 100 μm on the outer peripheral side
When it spreads to the center side beyond, the light amount is remarkably reduced, which is not preferable.

Since the light transmitting body of the present invention has the light absorbing agent dispersed in the outer peripheral portion, flare light generated in the vicinity thereof is absorbed by the light absorbing agent without interfacial reflection. For this reason, the flare light of the optical transmitter is reduced, and the performance of the optical transmitter is improved.

Further, in the optical transmission medium of the present invention, N layers (N ≧ 2) of the light absorber mixed layer in which the light absorber is uniformly mixed are formed, and the nth layer (N ≧ 2) from the center to the outer peripheral portion is formed. n =
1,2, ..., when the concentration of the light absorbing agent in the light absorber mixed layer of N) was d _n, the optical transmission member is d _n> d _n-1, the optical transmission article array Is preferable because the crosstalk light between adjacent lenses in the above method is greatly reduced. FIG. 2 shows an example of a light transmitting body in which two layers of a light absorbing agent are formed. In the embodiment shown in FIG. 2, the first light-absorbent mixed layer 2 is located immediately adjacent to and inside the second light-absorbent mixed layer 3.

In another expression, the expression d _n > d _n-1 for the light absorbing agent is expressed in the n-th layer (n = 1, 2,..., N) from the center to the outer periphery. the absorbance at a specific wavelength in the light absorbing agent mixed layer of) when the a _n, is a _n> a _n-1. Here, the specific wavelength is any one of the absorption wavelengths of the light absorbing agent added to the optical transmission medium, and is practically the wavelength of visible light, near infrared light, or near ultraviolet light. Is set to the area. When a plurality of types of light absorbers are present, it is only necessary that A _n > A _n-1 is satisfied for the sum of the absorbances of the plurality of light absorbers at one specific wavelength (however, a plurality of light absorbers are provided at each of the plurality of wavelengths). It is preferable that A _n > A _n-1 holds for the total absorbance of the light absorbers). By using the light transmitting body using the light of the specific wavelength, the effect of introducing the light absorbing agent into the light transmitting body is exhibited. As a method of measuring the absorbance, a method in which each light-absorbent mixed layer is formed into a film of the same thickness and measured with a spectrophotometer, or the same weight is measured for each light-absorbent mixed layer, dissolved in a solvent, and dissolved in a solvent to obtain a spectrophotometer There is a method of measuring with a meter.

The light transmitting body 1 has a light absorbing agent dispersed in an outer peripheral portion.
Flare light generated in the vicinity of the
Absorbed by light absorber without irradiation. Further
And d _n > D_n-1 (Or A_n > A_n-1 ) And light
Since the concentration of the light absorbent in the absorbent mixed layer 3 is high,
As shown in FIG. 3, a number of optical transmission bodies 1 are parallel to each other.
In the direction perpendicular to the direction of the optical transmitter.
In the case where the optical transmitter array 5 is arranged in a row (row).
In addition, light cross-talk between adjacent optical transmitters 1 is greatly reduced.
It is said that the performance of the optical transmitter array 5 is improved in order to reduce
There are features. Also, d_n ≦ d_n-1 (Or A_n ≤A
_n-1 ), The light transmitted through the optical transmitter 1
The quantity can be kept high. That is, the optical transmitter 1 is
The light absorber is mixed almost uniformly in the thickness direction in the constituent composition.
Two or more existing layers are formed, and d_n> D_n-1 (is there
A_n > A_n-1 ), The optical transmission array 5
Crosstalk light is reduced and light transmitted by the optical transmitter array 5 is reduced.
The drop in volume is small. Note that, in FIG.
Adhesive for bonding the fibers and maintaining the array of optical transmission bodies 1
The illustration of a side plate for holding is omitted.

The optical transmission body 1 has d _n > d _n-1 (or A
_n > A _n-1 ), but effectively reduces crosstalk light in the optical transmitter array 5;
In order to effectively prevent a decrease in the amount of light, it is more preferable that d _n ≧ 2d _{n -1} (or A _n ≧ 2A _{n -1} ). Further, when d _n ≧ 5 d _{n -1} (or A _n ≧ 5A _{n -1} ), as shown in FIG. The lens plate 6 arranged in a plane perpendicular to the direction of the central axis of the transmission body is particularly preferable because crosstalk light is hardly observed. That is, in the lens plate 6, since one optical transmitter 1 is in contact with the other six optical transmitters, the amount of crosstalk light is larger than that of the optical transmitter array 5. Therefore, when the lens plates 6 using a number of light transmitting body 1 in order to eliminate cross talk light more effectively, d _n ≧ 5d _n-1
(Or A _n ≧ 5A _n-1 ).

The concentration of the light absorbing agent in each of the light absorbing agent mixed layers 2 and 3 of the light transmitting body 1 is substantially uniform. Looking at the distribution of the light transmitted through the optical transmission body 1 in the cross section of FIG. 2, the light passing through the central portion is larger than the light passing through the peripheral portion. Therefore, the refractive index distribution becomes worse toward the periphery, but the actual amount of transmitted light decreases,
As the distance from the center increases, the deviation of the refractive index distribution from the ideal decreases, and the amount of transmitted light increases. For this reason, it is more effective to prevent flare light when the light absorber is present in a portion (peripheral portion) where the refractive index distribution is irregular.

As the light absorbing agent, various dyes, pigments and dyes capable of absorbing light having a wavelength used in the optical system in which the light transmitting body 1 is used can be used. It is particularly effective to use a dye that absorbs the wavelength light used in the optical transmitter 1 in combination. When the light transmitter 1 is used for an application such as a color scanner as the light transmitter array 5, it is preferable to use a combination of dyes that absorb light of each wavelength of RGB. When the purpose is to absorb all light in the visible light region, a black material in which various kinds of dyes, pigments, and pigments are mixed can be selected. Further, a light absorbing agent such as carbon black and graphite carbon can also be used.
There is no particular limitation as long as it is a substance that absorbs light. In the present invention, it is preferable that the light absorbing agent is present in a dispersed state in the composition constituting the light transmitting body 1. This is a state in which dye molecules and pigment molecules are dispersed or bonded in the organic polymer in a field of physical or chemical affinity.

The concentration of the light absorbing agent contained in the light absorbing agent mixed layers 2 and 3 of the light transmitting body 1 is preferably in the range of 0.001 to 10% by weight, more preferably 0.01 to 1% by weight. . If the concentration is too low, the effect of preventing flare light and the effect of preventing crosstalk light are low.

The optical transmitter array 5 can be manufactured using the optical transmitter 1 by a conventionally known method. As long as the optical transmission bodies 1 are arranged in a single row as shown in FIG. 3 or a plurality of the optical transmission bodies 1 are arranged so that the respective rows are parallel to each other, the shape and material of the array are not limited. As a result, an optical transmitter array can be obtained in which the transmitted image is less blurred and the optical system can be made compact.

As shown in FIG. 5, the image sensor according to the present invention has the above-described optical transmitter array 5 and light receiving sensor 32. It is preferable to arrange a light source 31 for illuminating the read document 33. Scanned manuscript 33
Is conveyed in the direction of the arrow, an image of the read document 33 illuminated by the light source 31 is formed on the light receiving sensor 32 by the optical transmitter array 5 and read. The image sensor of the present invention may be used as a monochrome image sensor using light having a wavelength corresponding to the absorption wavelength of the light absorbing agent mixed in each light transmitter of the light transmitter array 5, or may be mixed in the light transmitter. When the light absorber used absorbs the three primary colors of RGB, it may be used as a color image sensor.

In the case of a color image sensor, it is preferable to use an LED light source of three primary colors of RGB or a white light source as the light source 31. Also, the light receiving sensor 3
As 2, when using RGB three primary color LED light sources, any of a monochrome light receiving sensor and a three primary color light receiving sensor can be used. When a white light source is used, light receiving sensors for three primary colors can be used.

The image sensor of the present invention can read a good color image because the image is less blurred due to chromatic aberration. In addition, good monochrome or color image reading with less influence of flare light and crosstalk light is possible.

Next, the lens plate 6 will be described.
You. The lens plate 6 is d_n ≧ 5d _n-1 (Or A
_n ≧ 5A_n-1 ) Is brought into a flat shape
They are arranged.

In the conventional lens plate, one optical transmission member comes in contact with the other six optical transmission members, so that a large amount of crosstalk light is generated, and the crosstalk light causes a blurred light called a ghost to be emitted from the optical transmission member. This has adversely affected the two-dimensional image display performance. However, the lens plate 6 according to the present invention has d _n ≧ 5 d _n−1 (or A _n ≧ 5A).
_{n- 1} ), the optical transmitters 1 are used.
There is almost no reduction in performance due to crosstalk light, and a clear display image can be formed when used as a display screen. The lens plate 6 of the present invention can be preferably used for applications such as displaying, reading, and transmitting two-dimensional images.

The lens plate 6 can be manufactured as follows. That is, a large number of optical transmission bodies are arranged in close contact with one another in a bale-stacked shape so as to be parallel to each other. An adhesive containing a black light absorbing agent or the like is injected into the gap between the light transmitting bodies, and the light transmitting bodies are bonded and fixed. The assembly of the optical transmission bodies fixed by bonding is cut perpendicular to the central axis of the optical transmission body, and the end surface is polished to a mirror surface to obtain a lens plate 6 having a predetermined thickness as shown in FIG. .

The two-dimensional image forming apparatus of the present invention is characterized by using a lens plate 6 as shown in FIG. That is, this image forming apparatus includes a display 35 as an image light source for forming a two-dimensional display image, a lens plate 6 and a screen 36 on which the image on the display 35 is projected. Are displayed on the screen 36. The erect real image may be enlarged, equal in magnification, or reduced, and may be selected according to the purpose. To enlarge or reduce the erect real image, a lens for enlargement or reduction is arranged between the lens plate and the screen. The display 35 and the screen 36 may be any known ones. The two-dimensional image forming apparatus of the present invention can form a clear image because the influence of the crosstalk light is very small.

Although the case where the number N of the light-absorbing agent-containing layers is 2 has been described above, the present invention can be implemented in the same manner even when the number N is 3 or more. For example,
In the case of N = 3, the light transmitting body of the present invention is [the light absorbing agent concentration d ₃ (or the absorbance A ₃ ) of the _third light absorbing agent mixed layer]>
[Light absorber concentration d ₂ (or absorbance A ₂ ) of second light absorber mixed layer] is satisfied, and [light absorber concentration d ₂ (or absorbance A ₂ of light absorber mixed layer of second layer) is satisfied. )]> [Light absorber concentration d ₁ (or absorbance A in _first light absorber mixed layer)
₁ )] is satisfied. When an optical transmitter is used for the lens plate, the optical transmitter of the present invention has d ₃ > 5d ₂ and d ₂ >
It is preferable to satisfy 5d ₁ (or A ₃ > 5A ₂ and A ₂ > 5A ₁ ).

The optical transmitter 1 of the present invention can be manufactured as follows. Uncured viscosity of 10 ³ to 10
^A substance having ⁸ poises and a cured product obtained by curing the substance, and the refractive index n _{d of which} is n _d1 > n _d2 >...> N _dX (X ≧ 3). When laminating from the center to the outer periphery, an uncured laminate (hereinafter referred to as a “filament” as appropriate) is arranged so that the refractive index gradually decreases toward the outer periphery, and is concentrically laminated. ), And while the inter-diffusion process of the substance between adjacent layers is performed or after the inter-diffusion process is performed so that the refractive index distribution between the layers of the filament becomes a continuous distribution, the filament is cured. Manufactured by processing. X is desirably in the range of 4 to 6 in order to make the refractive index distribution of the obtained optical transmission body close to the ideal distribution. When a light absorbing agent is mixed in the light transmitting body, for example, the light absorbing agent is mixed in advance into the Xth and / or X-1st uncured material from the center side.

The uncured substance used in the present invention preferably has a viscosity of 10 ³ to 10 ⁸ poise and is curable. If the viscosity is too low, thread breakage occurs during shaping, and it is difficult to form a thread. On the other hand, if the viscosity is too high, the operability during shaping is poor, and concentricity of each layer is impaired, or a thread having a large thickness unevenness is apt to be formed, which is not preferable. The uncured material is preferably composed of a mixture of a monomer and a polymer.

In order to cure the thread formed from the uncured material, it is preferable to add a thermosetting catalyst or a photocuring catalyst to the uncured material. An azo-based catalyst is used. Photocuring catalysts include benzophenone, benzoin alkyl ether, 4'-isopropyl-2-hydroxy-2-methylpropiophenone, 1-hydroxycyclohexyl phenyl ketone, benzyl methyl ketal, 2,2-diethoxyacetophenone, chlorothioxanthone, and thioxanthone Compounds, benzophenone-based compounds, ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, N-methyldiethanolamine, triethylamine and the like.

Next, in order to cure the uncured material, ultraviolet rays are preferably applied from the surroundings in the cured portion, and the filament containing the thermosetting catalyst and / or the photocuring catalyst is subjected to heat treatment or photocuring treatment.

The optical transmission body 1 of the present invention can be manufactured by using, for example, a filament forming apparatus shown in FIG. FIG.
FIG. 1 is a schematic configuration diagram of a filament forming apparatus, showing an interdiffusion unit 1;
2 and only the hardening portion 13 are shown in a longitudinal sectional view. In FIG. 7, reference numeral 10 denotes a concentric composite nozzle, 1
1 is an extruded uncured filament, 12 is a mutual diffusion part for diffusing monomers of each layer of the filament mutually to give a refractive index distribution, and 13 is curing for curing the uncured material. Processing unit, 14 is a take-off roller, 15 is a manufactured optical transmission body, 16 is a winding unit, 17 is an inert gas inlet,
Reference numeral 18 denotes an inert gas discharge port. In order to remove volatile substances released from the filament 11 from the interdiffusion section 12 and the hardening section 13, an inert gas such as nitrogen gas is introduced from the inert gas inlet 17.

The light source used for photopolymerization is 150 to 60
Examples thereof include a carbon arc lamp, a high-pressure mercury lamp, a medium-pressure mercury lamp, a low-pressure mercury lamp, an ultra-high-pressure mercury lamp, a chemical lamp, a xenon lamp, and a laser beam that generate light having a wavelength of 0 nm.

[0057]

The present invention will be described in detail with reference to the following examples.

Example 1 Polymethyl methacrylate ([η] = 0.40, MEK
Medium, measured at 25 ° C .: The following [η] of polymethyl methacrylate was the same) 47 parts by weight, tricyclo [5.2 ·
[ ^1.0,6 ] decanyl methacrylate 35 parts by weight, methyl methacrylate 18 parts by weight, 1-hydroxycyclohexyl phenyl ketone 0.25 parts by weight, and hydroquinone 0.1 parts by weight are kneaded at 70 ° C. to form a first layer. 49 parts by weight of polymethyl methacrylate, 15 parts by weight of tricyclo [ ^5.2.1.2.6 ] decanyl methacrylate, 36 parts by weight of methyl methacrylate, 0.25 parts by weight of 1-hydroxycyclohexylphenyl ketone, 0.1 part by weight of hydroquinone was heated and kneaded at 70 ° C. to prepare a stock solution for forming a second layer, 51 parts by weight of polymethyl methacrylate, 10 parts by weight of tricyclo [ ^5.2.1.02,6 ] decanyl methacrylate, 10 parts by weight of t-butyl methacrylate, 29 parts by weight of methyl methacrylate, 1-
0.25 parts by weight of hydroxycyclohexyl phenyl ketone and 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. to prepare a stock solution for forming a third layer. 50 parts by weight of polymethyl methacrylate, 30 parts by weight of t-butyl methacrylate, methyl methacrylate 20 parts by weight, 0.25 parts by weight of 1-hydroxycyclohexylphenyl ketone, 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. to prepare a stock solution for forming a fourth layer, 42 parts by weight of polymethyl methacrylate and 18 parts by weight of methyl methacrylate , 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate, 40 parts by weight, 1-hydroxycyclohexyl phenyl ketone 0.25 part by weight, and hydroquinone 0.1 part by weight were heated and kneaded at 70 ° C. The fifth
The five kinds of stock solutions, which were used as layer forming stock solutions, were sequentially arranged from the center so that the refractive index of the uncured material became lower from the center using a concentric five-layer composite nozzle, and were simultaneously extruded.

The temperature of the composite spinning nozzle 10 was 48 ° C. The discharge ratio of each layer is 55/15/1 in the ratio of the radial dimension.
2/16/2. Then, each layer is passed through a 30 cm-long inter-diffusion processing section 12, and thereafter, 12 chemical lamps each having a length of 120 cm and 40 W are passed through a strand fiber to the center of a light irradiation hardening processing section 13 arranged at equal intervals in a circular shape. It was picked up by the nip roller 14 at a speed of 120 cm / min. Nitrogen flow rate in the interdiffusion processing section is 80L
/ Min.

The obtained optical transmitter has a radius R of 0.29 mm.
And the refractive index is 1.502 at the center and 1.4 at the outer periphery.
80. The Abbe number in the range of 0 to 0.8R from the center to the outer periphery was between 54 and 55. 2,2,3,3,4,
0.9 for 4,5,5-octafluoropentyl methacrylate
It was contained only in the range outside R, and its content was about 35% by weight in 0.99R to R.

Using a plurality of these light transmitting bodies, using two phenolic resins (1.2 mm thick) on both side plates, and using an epiform (manufactured by Somar) containing 2 wt% of carbon black as an adhesive. The light transmitting bodies were arranged in parallel in a row between the side plates, filled with an adhesive, cured with the adhesive, and then cut and polished at both end faces to produce a light transmitting body array having a lens length of 7 mm. When image transmission (image reading) was performed by incorporating this optical transmitter array into a color image sensor head, a transmission image with less bleeding due to chromatic aberration was obtained. The conjugate length was 14 mm.

Example 2 An optical transmitter was obtained in the same manner as in Example 1 except that tricyclo [ ^5.2.1.02,6 ] decanyl methacrylate was changed to adamantyl methacrylate.

The obtained optical transmission body has a radius R of 0.29 mm.
And the refractive index is 1.508 at the center and 1.4 at the outer periphery.
80. The Abbe number in the range of 0 to 0.8R from the center to the outer periphery was between 54 and 55. 2,2,3,3,4,
The range and content of 4,5,5-octafluoropentyl methacrylate were almost the same as in Example 1.

Using a plurality of these optical transmission members, a lens length of 6
An optical transmitter array was produced in the same manner as in Example 1 except that the thickness was set to mm. When this optical transmitter array was incorporated into a color image sensor head and image transmission was performed,
A transmission image with less bleeding due to chromatic aberration was obtained. The conjugate length was 12 mm.

Example 3 70 parts by weight of polymethyl methacrylate, 40 parts by weight of isobornyl methacrylate, 16 parts by weight of methyl methacrylate, 0.25 part by weight of 1-hydroxycyclohexylphenyl ketone and 0.1 part by weight of hydroquinone
The mixture was heated and kneaded at a temperature of 40 ° C. to obtain a stock solution for forming a first layer, which was 49 parts by weight of polymethyl methacrylate, 15 parts by weight of isobornyl methacrylate, 36 parts by weight of methyl methacrylate,
0.25 parts by weight of hydroxycyclohexyl phenyl ketone and 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. to prepare a stock solution for forming a second layer, 51 parts by weight of polymethyl methacrylate, 10 parts by weight of isobornyl methacrylate, t- 10 parts by weight of butyl methacrylate, 29 parts by weight of methyl methacrylate, 0.25 parts by weight of 1-hydroxycyclohexyl phenyl ketone, 0.1 part of hydroquinone
50 parts by weight of polymethyl methacrylate, 10 parts by weight of t-butyl methacrylate, 25 parts by weight of methyl methacrylate
Parts by weight, 15 parts by weight of 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate, 0.25 part by weight of 1-hydroxycyclohexylphenyl ketone 0.1 part by weight of hydroquinone are heated and kneaded at 70 ° C. To obtain a fourth layer forming stock solution.
42 parts by weight of polymethyl methacrylate, 18 parts by weight of methyl methacrylate, 40 parts by weight of 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate 0.25 parts by weight of 1-hydroxycyclohexylphenyl ketone, hydroquinone 0.1 part by weight was heated and kneaded at 70 ° C. to prepare a fifth layer forming stock solution. The five kinds of stock solutions were sequentially concentrated from the center using a concentric five-layer composite nozzle so that the refractive index of the uncured material became lower. Aligned and extruded simultaneously.

The temperature of the composite spinning nozzle was 48 ° C.
The discharge ratio of each layer is 40/15/25 / in the ratio of the radial dimension.
18/2. An optical transmitter was obtained in the same manner as in Example 1 except for these points.

The obtained optical transmission body has a radius R of 0.29 mm.
And the refractive index is 1.496 at the center and 1.4 at the outer periphery.
80. The Abbe number in the range of 0 to 0.8R from the center to the outer periphery was between 54 and 55. 2,2,3,3,4,
4,5,5-octafluoropentyl methacrylate is 0.6
R is contained only in the range outside the R, and the content is 5% by weight or less in 0.5R to 0.8R, 0.99R
To R was about 35% by weight.

An optical transmitter array was manufactured in the same manner as in Example 1 except that a plurality of the optical transmitters were used and the lens length was 7.5 mm. When this optical transmitter array was incorporated into a color image sensor head and image transmission was performed, a transmission image with less bleeding due to chromatic aberration was obtained.
The conjugate length was 16 mm.

Example 4 Example 1 was used as the undiluted solution for forming the first layer and the undiluted solution for forming the fifth layer.
48 parts by weight of polymethyl methacrylate, 23 parts by weight of tricyclo [ ^5.2.1.02 ] decanyl methacrylate, 29 parts by weight of methyl methacrylate, 0.1 part of 1-hydroxycyclohexyl phenyl ketone.
25 parts by weight and 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. to obtain a stock solution for forming a second layer, 50 parts by weight of polymethyl methacrylate, tricyclo [5.2.1.0]
^2,6 ] decanyl methacrylate 10 parts by weight, methyl methacrylate 40 parts by weight, 1-hydroxycyclohexyl phenyl ketone 0.25 parts by weight, hydroquinone 0.1
Parts by weight were heated and kneaded at 70 ° C. to prepare a stock solution for forming a third layer, 50 parts by weight of polymethyl methacrylate, 40 parts by weight of methyl methacrylate, 2,2,3,3,4,4,5,5-octafluoro. 10 parts by weight of pentyl methacrylate, 0.25 parts by weight of 1-hydroxycyclohexyl phenyl ketone and 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. to obtain a stock solution for forming a fourth layer, and the discharge ratio of each layer was determined in the radial dimension ratio. 48 /
The optical transmitter was manufactured in the same manner as in Example 1 except that the conditions were changed to 12/20/18/2.

The obtained optical transmission body has a radius R of 0.29 mm.
And the refractive index is 1.502 at the center and 1.4 at the outer periphery.
80. The Abbe number in the range of 0 to 0.8R from the center to the outer periphery was between 54 and 56. 2,2,3,3,4,
4,5,5-octafluoropentyl methacrylate is 0.6
Is contained only in a range outside R, the content is 5% by weight or less in 0.5R to 0.8R,
It was about 35% by weight in 0.99R to R.

When the image transmission was performed by incorporating the optical transmitter array manufactured in the same manner as in Example 1 into a color image sensor head, a transmission image with less bleeding due to chromatic aberration was obtained. The conjugate length was 14 mm.

Example 5 57 parts by weight of polymethyl methacrylate, 43 parts by weight of methyl methacrylate, 0.25 parts by weight of 1-hydroxycyclohexylphenyl ketone and 0.1 part by weight of hydroquinone were kneaded at 70 ° C. to form a first layer. Undiluted,
52 parts by weight of polymethyl methacrylate, 38 parts by weight of methyl methacrylate, 10 parts by weight of t-butyl methacrylate, 0.1 part of 1-hydroxycyclohexylphenyl ketone.
25 parts by weight and 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. to obtain a stock solution for forming a second layer, 51 parts by weight of polymethyl methacrylate, 20 parts of t-butyl methacrylate 20
3 parts by heating and kneading 29 parts by weight of methyl methacrylate, 0.25 part by weight of 1-hydroxycyclohexyl phenyl ketone, and 0.1 part by weight of hydroquinone at 70 ° C.
49 parts by weight of polymethyl methacrylate, 35 parts by weight of t-butyl methacrylate, 16 parts by weight of methyl methacrylate, 0.25 parts by weight of 1-hydroxycyclohexylphenyl ketone 0.25 parts by weight of hydroquinone 0.1
Parts by weight were heated and kneaded at 70 ° C. to prepare a stock solution for forming the fourth layer, 42 parts by weight of polymethyl methacrylate, 18 parts by weight of methyl methacrylate, 2,2,3,3,4,4,5,5-octafluoro. 40 parts by weight of pentyl methacrylate, 0.25 parts by weight of 1-hydroxycyclohexyl phenyl ketone, and 0.1 parts by weight of hydroquinone were heated and kneaded at 70 ° C. to obtain a stock solution for forming a fifth layer. An optical transmitter was obtained in the same manner as in Example 1 except for the composition of these stock solutions.

The obtained optical transmission body has a radius R of 0.29 mm.
And the refractive index is 1.492 at the center and 1.4 at the outer periphery.
80. The Abbe number in the range of 0 to 0.8R from the center to the outer periphery was between 54 and 55. 2,2,3,3,4,
0.9 for 4,5,5-octafluoropentyl methacrylate
It was contained only in the range outside R, and its content was about 35% by weight in 0.99R to R.

Using a plurality of these optical transmission members, a lens length of 9
An optical transmitter array was produced in the same manner as in Example 1 except that the thickness was set to mm. When this optical transmitter array was incorporated into a color image sensor head and image transmission was performed,
A transmission image with less bleeding due to chromatic aberration was obtained. The conjugate length was 18 mm.

Comparative Example 1 52 parts by weight of polymethyl methacrylate, 35 parts by weight of benzyl methacrylate, 13 parts by weight of methyl methacrylate, 0.1 part of 1-hydroxycyclohexyl phenyl ketone.
25 parts by weight and 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. to obtain a stock solution for forming a first layer, 51 parts by weight of polymethyl methacrylate, 33 parts by weight of benzyl methacrylate, 16 parts by weight of methyl methacrylate, 1-hydroxycyclohexyl 0.25 parts by weight of phenyl ketone and 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. to prepare a stock solution for forming a second layer, 50 parts by weight of polymethyl methacrylate, 30 parts by weight of benzyl methacrylate, 20 parts by weight of methyl methacrylate, 0.25 parts by weight of 1-hydroxycyclohexyl phenyl ketone and 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. to obtain a stock solution for forming a third layer.
50 parts by weight of polymethyl methacrylate, 15 parts by weight of benzyl methacrylate, 35 parts by weight of methyl methacrylate, 0.1 part of 1-hydroxycyclohexyl phenyl ketone.
25 parts by weight of hydroquinone 0.1 part by weight was heated and kneaded at 70 ° C. to prepare a fourth layer forming stock solution, 42 parts by weight of polymethyl methacrylate, 18 parts by weight of methyl methacrylate,
40 parts by weight of 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate, 0.25 part by weight of 1-hydroxycyclohexyl phenyl ketone, and 0.1 part by weight of hydroquinone were heated and kneaded at 70 ° C. This undiluted solution for forming the fifth layer,
Using a concentric five-layer composite nozzle, the undiluted solutions were sequentially arranged from the center so that the refractive index of the uncured material became lower, and were simultaneously extruded.

The temperature of the composite spinning nozzle was 48 ° C.
The discharge ratio of each layer is 48/14/16 /
21/1. An optical transmitter was manufactured in the same manner as in Example 1 except for these points.

The obtained optical transmission body has a radius R of 0.29 mm.
And the refractive index is 1.512 at the center and 1.5 at the outer periphery.
04. The Abbe number in the range of 0 to 0.8R from the center to the outer periphery was between 49 and 52.

Using a plurality of these optical transmission members, a lens length of 9
An optical transmitter array was produced in the same manner as in Example 1 except that the distance was set to mm. When this optical transmitter array was incorporated into a color image sensor head to perform image transmission, the resulting transmitted image was blurred due to chromatic aberration. The transmission image had a low resolution due to the influence of flare light and crosstalk light.

Example 6 In Example 1, 0.12 parts by weight of Nippon Kayaku Co., Ltd. Dye Blue ACR and Mitsui Toatsu Dye Co., Ltd. Dye MS Yellow HD-1800.1 were added to the stock solution of the fourth layer.
0 parts by weight and dye MS Mag manufactured by Mitsui Toatsu Dye Co., Ltd.
0.08 parts by weight of enta HM-1450 was added, and the mixture was heated and kneaded at 70 ° C. in the same manner as in Example 1 to obtain a stock solution for the fourth layer. Other conditions were the same as in Example 1 to obtain an optical transmitter.

The obtained light transmitter was the same as Example 1 except that the above dye was contained, and the light transmitter array manufactured in the same manner as in Example 1 was incorporated into a color image sensor head. As a result, a good transmission image was obtained, in which bleeding due to chromatic aberration was small and the influence of flare light was extremely small. The conjugate length was 14 mm.

Example 7 In Example 1, 0.12 parts by weight of Nippon Kayaku Co., Ltd. Dye Blue ACR and Mitsui Toatsu Dye Co., Ltd. Dye MS Yellow HD-1800.1 were added to the stock solution of the fourth layer.
0 parts by weight and dye MS Mag manufactured by Mitsui Toatsu Dye Co., Ltd.
0.08 parts by weight of enta HM-1450, the dye BlueACR 0.2 manufactured by Nippon Kayaku Co., Ltd.
0 parts by weight, dye MS Yellow manufactured by Mitsui Toatsu Dye Co., Ltd.
w HD-180 0.15 part by weight, and Mitsui Toatsu Dye Co., Ltd. dye MS Magenta HM-1450
0.12 parts by weight, and 70
The mixture was heated and kneaded at ℃ to obtain a stock solution for the fourth and fifth layers. Other conditions were the same as in Example 1 to obtain an optical transmitter.

[0082] The obtained optical transmission medium is the same as in Example 1 except that the dye is contained, was measured the absorbance of each layer containing a dye, about 1 A ₂ is A ₁ .
5 times (wavelength of used light: 570 nm: the same applies hereinafter).

When the image transmission was performed by incorporating the optical transmitter array manufactured in the same manner as in Example 1 into a color image sensor head, good transmission with little bleeding due to chromatic aberration and extremely little influence of flare light and crosstalk light was obtained. An image was obtained. The conjugate length was 14 mm.

Example 8 In Example 1, 0.12 parts by weight of Nippon Kayaku Co., Ltd. Dye Blue ACR and Mitsui Toatsu Dye Co., Ltd. dye MS Yellow HD-1800.1 were added to the stock solution of the fourth layer.
0 parts by weight and dye MS Mag manufactured by Mitsui Toatsu Dye Co., Ltd.
0.08 parts by weight of enta HM-1450, and a dye BlueACR 0.3 manufactured by Nippon Kayaku Co., Ltd.
0 parts by weight, dye MS Yellow manufactured by Mitsui Toatsu Dye Co., Ltd.
0.20 parts by weight of w-HD-180 and dye MS Magenta HM-1450 manufactured by Mitsui Toatsu Dyeing Co., Ltd.
0.18 parts by weight, and 70
The mixture was heated and kneaded at ℃ to obtain a stock solution for the fourth and fifth layers. Other conditions were the same as in Example 1 to obtain an optical transmitter.

The obtained light transmitting body was the same as that of Example 1 except that the above-mentioned dye was contained, and the absorbance of the dye-containing layer was such that A ₂ was about twice as large as A ₁ .

The image transmission was performed by incorporating the optical transmitter array manufactured in the same manner as in Example 1 into a color image sensor head. As a result, good transmission with little bleeding due to chromatic aberration and extremely little influence from flare light and crosstalk light was obtained. An image was obtained. The conjugate length was 14 mm.

Example 9 In Example 1, 0.06 parts by weight of Nippon Kayaku Co., Ltd. Dye Blue ACR and Mitsui Toatsu Dye Co., Ltd. Dye MS Yellow HD-1800.0 were added to the stock solution of the fourth layer.
4 parts by weight and Mitsui Toatsu Dye Co., Ltd. Dye MS Mag
enta HM-1450 0.03 parts by weight, Nippon Kayaku Co., Ltd. dye BlueACR 0.4
0 parts by weight, dye MS Yellow manufactured by Mitsui Toatsu Dye Co., Ltd.
0.22 parts by weight of HD-180 and dye MS Magenta HM-1450 manufactured by Mitsui Toatsu Dyeing Co., Ltd.
0.12 parts by weight, and 70
The mixture was heated and kneaded at ℃ to obtain a stock solution for the fourth and fifth layers. Other conditions were the same as in Example 1 to obtain an optical transmitter.

The obtained light transmitting body was the same as that of Example 1 except that the above-mentioned dye was contained, and the absorbance of the dye-containing layer was such that A ₂ was about 5 times that of A ₁ .

When the image transmission was performed by incorporating the optical transmitter array manufactured in the same manner as in Example 1 into a color image sensor head, good transmission was obtained with little bleeding due to chromatic aberration and extremely little influence of flare light and crosstalk light. An image was obtained. The conjugate length was 14 mm.

Comparative Example 2 In Comparative Example 1, 0.06 parts by weight of Dye Blue ACR manufactured by Nippon Kayaku Co., Ltd. and Dye MS Yellow HD-1800.0 manufactured by Mitsui Toatsu Dye Co., Ltd. were added to the stock solution of the fourth layer.
4 parts by weight and Mitsui Toatsu Dye Co., Ltd. Dye MS Mag
enta HM-1450 0.03 parts by weight, Nippon Kayaku Co., Ltd. dye BlueACR 0.4
0 parts by weight, dye MS Yellow manufactured by Mitsui Toatsu Dye Co., Ltd.
0.22 parts by weight of HD-180 and dye MS Magenta HM-1450 manufactured by Mitsui Toatsu Dyeing Co., Ltd.
0.12 parts by weight, and 70
The mixture was heated and kneaded at ℃ to obtain a stock solution for the fourth and fifth layers. Other conditions were the same as in Comparative Example 1 to obtain an optical transmitter.

The obtained light transmitting body was the same as Comparative Example 1 except that the above dye was contained, and the absorbance of the dye-containing layer was such that A ₂ was about 5 times that of A ₁ .

When the image transmission was performed by incorporating the optical transmitter array manufactured in the same manner as in Comparative Example 1 into a color image sensor head, the obtained transmission image was blurred by chromatic aberration.

Example 10 The composition of the undiluted solution of the first to fifth layers was the same as that of Example 1 except for the type and amount of the dye, and Nippon Kayaku Co., Ltd. was contained in the undiluted solution of the fourth layer.
0.06 parts by weight of Blue ACR dye, MS MS HD-180 dye manufactured by Mitsui Toatsu Dye Co., Ltd.
0.04 parts by weight and Mitsui Toatsu Dye Co., Ltd. Dye MS
0.04 parts by weight of Magenta HM-1450, in the stock solution of the fifth layer, the dye Blue ACR manufactured by Nippon Kayaku Co., Ltd.
0.50 parts by weight, dye MSY manufactured by Mitsui Toatsu Dye Co., Ltd.
0.22 parts by weight of yellow HD-180 and dye MS Magenta HM-1 manufactured by Mitsui Toatsu Dyeing Co., Ltd.
0.14 parts by weight of 450 was added, and the mixture was heated and kneaded at 70 ° C. in the same manner as in Example 1 to obtain a stock solution for the fourth and fifth layers.

An optical transmitter was obtained in the same manner as in Example 1 except that the amount of ultraviolet light was 1.30 times that of Example 1. Absorbance of the dye-containing layer, A ₂ was about 6 times the A _1.

The obtained light transmitting bodies are cut into a predetermined length, arranged in parallel in a bale-stacked shape, closely packed and closely packed to form a two-dimensional plane, and carbon is filled in the gaps between the light transmitting bodies arranged in a plane. Epiform with Black 2wt% (Somar)
Was filled, the adhesive was cured, and then both end faces were cut and polished to produce a lens plate having a lens length of 7 mm, a length of 210 mm and a width of 300 mm.

This lens plate is disposed between an A4 size display and a screen using an A4 size diffusion plate, and a two-dimensional image such that an erect real-size real image of the display image on the display is projected on the screen. An image forming apparatus was manufactured. When a color image displayed on a display was projected on a screen using this image forming apparatus, a clear color image with very little influence of flare light or crosstalk light could be formed.

Example 11 The lens length of the lens plate of Example 10 was 6.4 mm, and this lens plate was disposed between an A4 size display and a screen using a 300 mm long and 430 mm wide diffusion plate. Further, a two-dimensional image forming apparatus in which a magnifying lens is arranged between the lens plate and the screen to display an erect magnified real image of the display image on the display on the screen was manufactured. When a color image displayed on a display was projected on a screen using this image forming apparatus, a clear color image with very little influence of flare light or crosstalk light could be formed.

Example 12 The composition of the stock solution for forming the first to fifth layers was the same as in Example 10, and the take-up speed of the nip roller was 60 cm / min.
, The discharge amount is changed, and the radius R of the optical transmission body is set to 0.
An optical transmitter was obtained in the same manner as in Example 10 except that the length was 47 mm.

The refractive index of the obtained optical transmission body was 1. at the center.
502 and the outer peripheral portion was 1.480. The Abbe number in the range of 0 to 0.8R from the center to the outer periphery was between 54 and 55.

Example 1 except that the lens length was 12 mm
A lens plate was produced in the same manner as in Example 1.

This lens plate is disposed between an A4 size display and a screen using an A4 size diffusion plate, and a two-dimensional image is displayed on the screen to display an erect real-size real image of the display image on the display. An image forming apparatus was manufactured. When a color image displayed on a display was projected on a screen using this image forming apparatus, a clear color image with very little influence of flare light or crosstalk light could be formed.

[0102]

According to the optical transmission body of the present invention, the difference between the Abbe number between the highest Abbe number and the lowest Abbe number in the range of 0 to 0.8R from the center to the outer circumference is 2 or less. The transmission can be performed with less chromatic aberration and less image unevenness than the refractive index distribution type optical transmission body of (1). In addition, the chromatic aberration is reduced by mixing the light absorber in a predetermined range,
An optical transmitter with less influence of flare light and crosstalk light can be obtained. The optical transmitter array according to the present invention has high performance because there is little bleeding due to chromatic aberration and there is little influence of flare light and crosstalk light. By forming an image sensor using the optical transmitter array of the present invention, a clear image with few spots can be obtained. Since the lens plate of the present invention has little chromatic aberration and little influence of crosstalk light and flare light, a two-dimensional image can be transmitted clearly. The two-dimensional image forming apparatus of the present invention can clearly display a display on a display on a screen.

[Brief description of the drawings]

FIG. 1 is a sectional view of an optical transmission body of the present invention.

FIG. 2 is a sectional view of the optical transmission body of the present invention.

FIG. 3 is a schematic perspective view of an optical transmitter array of the present invention.

FIG. 4 is a schematic perspective view of a lens plate according to the present invention.

FIG. 5 is a schematic configuration diagram of an image sensor of the present invention.

FIG. 6 is a schematic configuration diagram of the image forming apparatus of the present invention.

FIG. 7 is a schematic configuration diagram of a manufacturing apparatus for manufacturing the optical transmission body of the present invention.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Optical transmission body 2 Light absorbing agent mixing layer 3 Light absorbing agent mixing layer 4 Central axis 5 Optical transmission body array 6 Lens plate 10 Concentric composite nozzle 11 Uncured thread-like body 12 Mutual diffusion part 13 Curing processing part 14 Take-off roller 15 Optical transmission body 16 Rewinding section 17 Inert gas inlet 18 Inert gas outlet 31 Light source 32 Light receiving sensor 33 Reading document 35 Display 36 Screen

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshinori Sumi 20-1 Miyukicho, Otake City, Hiroshima Prefecture Inside Mitsubishi Central Research Institute, Inc. (72) Inventor Keita Ishimaru 201-1 Miyukicho, Otake City, Hiroshima Prefecture No. Mitsubishi Rayon Co., Ltd. Central Research Laboratory F-term (reference) 2H050 AB43Z AB44Z AC05 AC07 AC71 AC76 AD03

Claims (14)

[Claims] 1. A radius R which is composed of a plurality of types of polymers and whose refractive index decreases continuously from the center to the outer periphery.
Wherein the difference in Abbe number between the highest and lowest Abbe numbers in the range of 0 to 0.8R from the center to the outer periphery is 2
(A) methyl methacrylate, (B) an alicyclic group-containing (meth) acrylate and / or t-butyl methacrylate, and (C) a fluorinated alkyl methacrylate,
Each of the plurality of polymers is contained in at least one polymer, and the polymer containing the fluorinated alkyl methacrylate is contained in a predetermined range set at 0.5 R from the center and outside the center. An optical transmission body characterized in that: 2. The method according to claim 1, wherein the content of the fluorinated alkyl methacrylate in the whole polymer in the range of 0.5R to 0.8R from the center is 0 to 20% by weight. Optical transmission body. 3. The method according to claim 1, wherein the content of the fluorinated alkyl methacrylate in the whole polymer in the range of 0.99 R to R from the center is 20 to 60% by weight. Optical transmission body. 4. The alicyclic group of the alicyclic group-containing (meth) acrylate is any one of a tricyclo [ ^5.2.1.02,6 ] decanyl group, an adamantyl group and an isobornyl group. The optical transmission body according to claim 1, wherein: 5. The method according to claim 1, wherein the fluorinated alkyl methacrylate is 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate or 2,2,3,3-tetrafluoropropyl methacrylate. The optical transmission body according to any one of claims 1 to 4, wherein: 6. A light absorbing agent mixed layer in which a light absorbing agent is almost uniformly mixed is formed in a portion within 100 μm from the outer peripheral surface toward the center. An optical transmission body as described in the above. 7. The light absorbing agent mixed layer is formed with N layers (N ≧ 2), and is an n-th layer (n = 2) from the center toward the outer peripheral portion.
The density of the light absorber in the light absorber mixed layer of (1, 2,..., N) is _dn, and _dn > dn _-1. 2. The optical transmission body according to claim 1. 8. The light absorbing agent mixed layer is formed with N layers (N ≧ 2), and is an n-th layer (n = 2) from the center toward the outer peripheral portion.
1,2, ..., when the absorbance at a specific wavelength in the light absorbing agent mixed layer of N) was A _n, characterized in that it is a A _n> A _n-1, claim 6 2. The optical transmission body according to claim 1. 9. An optical transmission system comprising: a plurality of optical transmission bodies according to claim 1 arranged in a line in a direction crossing a central axis of the optical transmission bodies so as to be parallel to each other. An optical transmission body array having at least one body arrangement. 10. An image sensor comprising: the optical transmitter array according to claim 9; and a sensor on which an image is formed by the optical transmitter array. 11. The optical transmitter according to claim 7, wherein d _n ≧ 5d _{n -1} . 12. The optical transmitter according to claim 8, wherein A _n ≧ 5A _{n -1} . 13. The optical transmitter according to claim 11, wherein a plurality of the optical transmitters are closely adhered so as to be parallel to each other, and are arranged in a plane in a direction crossing a direction of a center axis of the optical transmitters. Lens plate. 14. An image forming apparatus, comprising: the lens plate according to claim 13; an image light source; and a screen on which an image of the image light source is projected by the lens plate.