CN111352211A - Small-head high-resolution lens - Google Patents
Small-head high-resolution lens Download PDFInfo
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- CN111352211A CN111352211A CN201811577059.1A CN201811577059A CN111352211A CN 111352211 A CN111352211 A CN 111352211A CN 201811577059 A CN201811577059 A CN 201811577059A CN 111352211 A CN111352211 A CN 111352211A
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
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Abstract
The invention relates to a small-head high-resolution lens, which comprises the following components in sequence from an object side to an image side: a first lens P1 with negative refractive power and concave object side, a second lens P2 with positive refractive power and convex image side, a diaphragm arranged between P1 and P2, and a prism I with 45 degree included angle between the reflecting surface and the optical axis; a third lens element with negative refractive power having a concave image-side surface, at least one surface of the third lens element being aspheric; a fourth lens element with positive refractive power having a convex object side, at least one surface of the fourth lens element being aspheric; a fifth lens element with negative refractive power having a convex image-side surface, wherein the object-side surface and the image-side surface are both concave at paraxial region; a fifth lens element with positive refractive power having a convex image-side surface; a sixth lens element with negative refractive power and a concave image-side surface, which has an M-shaped configuration. The prism is made of glass materials, the other six lenses are aspheric plastic lenses, the half apertures of the first lens and the second lens at the front ends are all smaller than 0.9, the field angle FOV is larger than 70 degrees, and the optical back focus is larger than 0.55.
Description
Technical Field
The invention relates to an optical lens, in particular to a periscopic lens with small head size, large field angle and high resolution, which is suitable for a mobile phone with a comprehensive screen and a very narrow frame.
Background
In the existing camera system, lens structures are arranged in a sequence straight line mode, and high pixels are required. Along with the screen occupation ratio of the smart phone is larger and larger, the frame is extremely small, the installation space of the lens is narrower, the head of the lens is required to meet the small space and the high resolution, and the small size and the high resolution of the head can be met by changing the arrangement mode of the lenses.
Disclosure of Invention
The invention aims to provide a small-head high-resolution lens, which has a small head size and a field angle larger than 70 degrees. The direction of an optical axis is changed through the prism, and the prism is combined with lenses with different focal powers for use, so that the high resolution of the lens is ensured, and the lens is suitable for the configuration of a mobile phone with a very narrow frame.
In order to realize the purpose of the invention, the technical scheme is as follows:
a small-head high-resolution lens, in order from an object side to an image side, comprises:
the first lens P1 has negative refractive power, and the object side is a concave surface;
the second lens element P2 has a convex image-side surface with positive refractive power;
the prism is arranged between the first lens P1 and the second lens P2, and the included angle between the reflecting surface and the optical axis is 45 degrees;
the third lens element P3 with negative refractive power has a concave image-side surface, and at least one surface thereof is aspheric;
the fourth lens element P4 with positive refractive power has a convex object-side surface, and at least one surface of the fourth lens element is aspheric;
the fifth lens element P5 with positive refractive power has a convex image-side surface; the object side surface is a concave surface at the position close to the optical axis;
the sixth lens element P6 with negative refractive power has a concave image-side surface and an M-shaped configuration;
the prism is made of glass materials, the other six lenses are aspheric plastic lenses, the field angle FOV is larger than 70 degrees, and the optical back focus is larger than 0.55 degrees;
the following formula is satisfied:
Y1<0.9
Y2<0.9
0.538<r1/r2<0.775
-0.339<f2/f1<-0.126
n1>1.66
1.638<-sag1+ct1+ct2+ct3<1.816
Et5>0.47
-2.178<f4/f3<-1.416
-2.495<f6/f<-0.677
-0.179<(r6-r7)/(r6+r7)<0.372
oal2/imh>1.315
0.83<ct4/ct5<2.688
abv1<30
abv6<30
wherein Y1 is the half aperture of the first lens and Y2 is the half aperture of the second lens; r1 is the radius of curvature of the object-side surface of the first lens, r2 is the radius of curvature of the image-side surface of the first lens; f1 is the focal length of the first lens P1, f2 is the focal length of the second lens P2, f3 is the focal length of the third lens P3, f4 is the focal length of the fourth lens P4, f6 is the focal length of the sixth lens, and f is the effective focal length of the system; sag1 is the object-side edge rise of first lens P1; ct1 is the center thickness of the first lens P1, ct3 is the center thickness of the second lens P2, and ct2 is the center-to-center spacing of the first lens P1 to the second lens P2; et7 is the distance between the image side surface of the prism and the edge of the third lens P3; oal2 is the length of the third lens P3 to the phase plane; r6 is the curvature radius of the object-side surface of the sixth lens, and r7 is the curvature radius of the image-side surface of the sixth lens; ct4 is the center thickness of the fourth lens, and ct5 is the center thickness of the fifth lens; abv1 is the Abbe number of the first lens P1, abv6 is the Abbe number of the sixth lens P6;
the half apertures of the first lens P1 and the second lens P2 are less than 0.9 mm.
The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are even-order aspheric plastic lenses, and aspheric coefficients meet the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+A16y16
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, and k is cone coefficient、A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
The invention has the beneficial effects that:
1. the invention is suitable for the extremely narrow frame of the mobile phone, requires the front end part of the head to be smaller in size, and meets the requirement of limiting the size of the front end of the lens so as to be minimized. The spherical aberration and astigmatism of the system can be reduced.
2. The field angle of the invention is larger than 70 degrees, the optical angles of the first lens and the second lens can be reasonably distributed, and meanwhile, the small size and the large field angle of the head are satisfied, and the resolving power is improved.
3. The first lens is negative refractive power, and a high-refractive-index material is used, so that the formula is satisfied, and the aberration and the name sensitivity of the whole system can be reduced. The length of the front end structure enables the lens to adapt to the ultrathin characteristic of the mobile phone, the interference amount of the second lens and the third lens relative to the lens barrel can be reduced, and the assembly stability is improved. The optical aberration correction device is beneficial to correcting the aberration of a system, reasonably distributing the light angle, reducing the field curvature of the marginal field of view, shortening the distance of the rear end of the lens and facilitating assembly. Shortening the overall length of the system. The aberrations of the system can be reduced.
4. In the process of increasing the light flux, the invention ensures that the lens has the advantage of large aperture, enhances the imaging effect in a dark environment and shortens the length of the lens.
5. The invention can simultaneously meet the conditions of large field angle and smaller outer diameter of the first lens, and is beneficial to improving the resolution sheet; the sixth lens has negative refractive power, the refractive index and the dispersion coefficient are less than 30, the resolving power of the system is improved, and the system aberration is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a lens barrel of the present invention;
FIG. 2 is an optical path diagram of the lens of the present invention;
FIG. 3 is a defocus graph of the lens of embodiment 1 of the present invention, wherein the abscissa is the defocus value (unit um) and the ordinate is the diffraction value of the corresponding field of view;
FIG. 4 is the vertical axis color difference values of example 1 of the present invention, with the vertical axis being the normalized field of view and the horizontal axis being the color difference values;
fig. 5 is an astigmatic field curvature diagram of the lens of embodiment 1 of the present invention, in which the abscissa is a field curvature value and the ordinate is a field height;
FIG. 6 is a graph of optical distortion for a lens of example 1 of the present invention, wherein the abscissa is the distortion percentage and the ordinate is the field image height;
FIG. 7 is a schematic structural view of embodiment 2;
FIG. 8 is a defocus graph of the lens of embodiment 2 of the present invention, wherein the abscissa is the defocus value (unit um) and the ordinate is the diffraction value of the corresponding field of view;
FIG. 9 is the vertical axis color difference values of example 1 of the present invention, with the vertical axis being the normalized field of view and the horizontal axis being the color difference values;
fig. 10 is an astigmatic field curvature diagram of the lens of embodiment 2 of the present invention, in which the abscissa is a field curvature value and the ordinate is a field height;
fig. 11 is an optical distortion graph of the lens of embodiment 2 of the present invention, in which the abscissa is the distortion percentage and the ordinate is the field image height;
FIG. 12 is the homeotropic color difference values for example 1 of the present invention, with the vertical axis being the normalized field of view and the horizontal axis being the color difference values;
FIG. 13 is a schematic structural view of embodiment 3;
FIG. 14 is a defocus graph of a lens of embodiment 3 of the present invention, in which the abscissa is an out-of-focus value (unit um) and the ordinate is a diffraction value of a corresponding field of view;
fig. 15 is an astigmatic field curvature diagram of the lens of embodiment 3 of the present invention, in which the abscissa is the field curvature value and the ordinate is the field height;
fig. 16 is an optical distortion graph of the lens of embodiment 3 of the present invention, in which the abscissa is the distortion percentage and the ordinate is the field image height.
Detailed Description
The invention is described in further detail below with reference to the accompanying figures 1-16 and examples.
The half aperture Y1 of the first lens and the half aperture Y2 of the second lens satisfy the formula:
y1 is less than 0.9, Y2 is less than 0.9, the camera system needs to adapt to the extremely narrow frame of the mobile phone, the size of the front end part of the head part is required to be small, the size of the front end of the lens can be effectively limited by the above formula, and the size of the front end of the lens is minimized.
The radius of curvature r1 of the object-side surface and the radius of curvature r2 of the image-side surface of the first lens satisfy the formula:
0.538<r1/r2<0.775
satisfying the above formula can reduce the spherical aberration and astigmatism of the system.
The focal length f2 of the second lens and the focal length f1 of the first lens satisfy the formula:
-0.339<f2/f1<-0.126
the field angle of the camera system is larger than 70 degrees, and the half aperture of the front lens P1 and P2 is required to be smaller than 0.9. The optical angle of the first lens and the second lens can be reasonably distributed, the small size and the large field angle of the head are met, and the resolving power is improved.
The refractive index N1 of the first lens satisfies the formula:
N1>1.66
in a typical lens, the object-side surface of the first lens element is convex and the refractive power is positive. The first lens of the camera system is negative refractive power, and high-refractive-index materials are used, so that the above formula is satisfied, and the aberration and the name sensitivity of the whole system can be reduced.
The lens structure in front of the prism satisfies the formula:
1.638<-sag1+ct1+ct2+ct3<1.816
the structural length of the P1 and the P2 is limited by the upper formula, the upper formula is satisfied, and the structural length of the front end enables the lens to adapt to the characteristic of ultra-thin mobile phone.
The edge-to-prism separation of the second lens P2 satisfies the formula:
et5>0.47
the P2 and the P3 interfere with the common wall part of the lens barrel, the above formula is satisfied, the interference amount of the P2 and the P3 relative to the lens barrel can be reduced, and the assembly stability is improved.
The focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy:
-2.178<f4/f3>-1.416
the imaging system uses the prism to change the direction of the optical axis, so that the imaging system is applied to an ultrathin structure. The optical lens meets the above formula, is beneficial to correcting the aberration of the system, reasonably distributes the light angle, reduces the field curvature of the marginal field of view, shortens the distance of the rear end of the lens and is convenient to assemble.
The focal length f6 of the sixth lens and the effective focal length of the system satisfy:
-2.495<f6/f>-0.677
the distance from the maximum rise of the image pickup system P6 to the image plane is larger than 0.55 mm. The above formula is satisfied, and the total length of the system is shortened.
The curvature radius r6 of the object side surface and the curvature radius r7 of the image side surface of the sixth lens satisfy:
-0.179<(r6-r7)/(r6+r7)<0.372
the range of the above formula can reduce the aberration of the system and improve the resolving power.
oal2/imgh>1.315
oal2 is the distance from the maximum rise of the object side to the image plane of the third lens p3 at the rear end of the prism, so that the design ensures that the lens has the advantage of large aperture in the process of increasing the light flux, the imaging effect in dark environment is enhanced, and the length of the lens is shortened
The central thickness ct2 of the second lens and the central thickness of the third lens satisfy the formula:
0.83<ct4/ct5<2.688
the thickness ratio of the fifth lens and the fourth lens is limited, so that the fifth lens can be used for compensating the high-order aberration of the third lens and the fourth lens, and the molding process and the assembly stability of the lens are facilitated.
The abbe number abv1 of the first lens and the abbe number abv6 of the sixth lens satisfy:
abv1<30,abv6<30
the first lens is a negative refractive power lens, satisfies the formula, has an abbe number less than 30, can satisfy the conditions of a large field angle and a small outer diameter of the first lens, and is beneficial to improving the resolving power sheet; the sixth lens has negative refractive power, the refractive index and the dispersion coefficient are less than 30, the resolving power of the system is improved, and the system aberration is reduced.
Example 1
In order from an object side to an image side: a first lens P1 with negative refractive power and concave object side, a second lens P2 with positive refractive power and convex image side, a diaphragm arranged between P1 and P2, and a prism I with 45 degree included angle between the reflecting surface and the optical axis; a third lens element with negative refractive power having a concave image-side surface, at least one surface of the third lens element being aspheric; a fourth lens element with positive refractive power having a convex object side, at least one surface of the fourth lens element being aspheric; a fifth lens element with negative refractive power having a convex image-side surface, wherein the object-side surface and the image-side surface are both concave at paraxial region; a fifth lens element with positive refractive power having a convex image-side surface; a sixth lens element with negative refractive power and a concave image-side surface, which has an M-shaped configuration. The prism is made of glass materials, the other six lenses are aspheric plastic lenses, the field angle FOV of the lens is larger than 70 degrees, and the optical back focus is larger than 0.55. And satisfies the following formula:
Y1<0.9；Y2<0.9
0.538<r1/r2<0.775
-0.339<f2/f1<-0.126
n1>1.66
1.638<-sag1+ct1+ct2+ct3<1.816
Et5>0.47
-2.178<f4/f3<-1.416
-2.495<f6/f<-0.677
-0.179<(r6-r7)/(r6+r7)<0.372
oal2/imh>1.315
0.83<ct4/ct5<2.688
abv1<30
abv6<30
1. wherein Y1 is the half aperture of the first lens and Y2 is the half aperture of the second lens; r1 is the radius of curvature of the object-side surface of lens P1, and r2 is the radius of curvature of the image-side surface of lens P1; f1 is the focal length of the first lens P1, f2 is the focal length of the second lens P2, f3 is the focal length of the third lens P3, f4 is the focal length of the fourth lens P4, f6 is the focal length of the sixth lens, and f is the effective focal length of the system; sag1 is the object-side edge rise of lens p 1; ct1, ct4 are the center thicknesses of lenses P1 and P2, respectively, and ct2 is the center-to-center spacing of lenses P1 to P2; et7 is the distance between the image side surface of the prism and the edge of the third lens P3; oal2 is the length of the third lens P3 to the phase plane; r6 is the curvature radius of the object-side surface of the sixth lens, and r7 is the curvature radius of the image-side surface of the sixth lens; ct4 is the center thickness of the fourth lens, and ct5 is the center thickness of the fifth lens; abv1 is the Abbe number of the first lens P1, abv6 is the Abbe number of the sixth lens P6;
p1 and P2 both have half apertures smaller than 0.9mm, and the optical reflection element between P1 and P2 is a 45-degree prism. And the field angle FOV is larger than 70 degrees, and the back focal length is larger than 0.55.
The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are even-order aspheric plastic lenses, and aspheric coefficients meet the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+A16y16
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
Specific design parameters of the lens are shown in tables 1 and 2.
TABLE 1
| Flour mark | Surface type | Radius of curvature | Thickness of | Abbe number of material | Refractive mode | Half aperture of Y | Half aperture of X | |
| obj | Spherical surface | Infinite number of elements | 400 | Refraction | ||||
| 1 | Aspherical surface | -2.40294 | 0.866631 | 1.661:20.534 | Refraction | 0.89 | 0.89 | |
| 2 | Aspherical surface | -4.4705 | 0.05 | Refraction | 0.858013 | 0.858013 | ||
| stop | Spherical surface | Infinite number of elements | -8E-17 | Refraction | 0.84053 | 0.84053 | ||
| 4 | Aspherical surface | 8.238453 | 0.55829 | 1.5445:55.987 | Refraction | 0.843476 | 0.843476 | |
| 5 | Aspherical surface | -2.14569 | 0.25 | Refraction | 0.9 | 0.9 | ||
| 6 | Spherical surface | Infinite number of elements | 1.25 | TAF1_HOYA | Refraction | 1.25 | 1.25 | |
| 7 | Spherical surface | Infinite number of elements | -1.25 | TAF1_HOYA | Reflection | 1.77 | 1.77 | Eccentricity and bending |
| 8 | Spherical surface | Infinite number of elements | -0.14753 | Refraction | 1.24 | 1.24 | ||
| 9 | Aspherical surface | 57.60721 | -0.26 | 1.6612:20.534 | Refraction | 1.303542 | 1.303542 | |
| 10 | Aspherical surface | -5.19791 | -0.05354 | Refraction | 1.359066 | 1.359066 | ||
| 11 | Aspherical surface | -16.6235 | -0.55476 | 1.5445:55.987 | Refraction | 1.389813 | 1.389813 | |
| 12 | Aspherical surface | 11.67857 | -0.05 | Refraction | 1.414199 | 1.414199 | ||
| 13 | Aspherical surface | -57.5301 | -0.66808 | 1.5445:55.987 | Refraction | 1.467502 | 1.467502 | |
| 14 | Aspherical surface | 3.876804 | -0.05 | Refraction | 1.520451 | 1.520451 | ||
| 15 | Aspherical surface | -1.06004 | -0.44137 | 1.6397:23.53 | Refraction | 1.532508 | 1.532508 | |
| 16 | Aspherical surface | -0.73846 | -0.97506 | Refraction | 1.996 | 1.996 | ||
| IMA | Spherical surface | Infinite number of |
0 | Refraction | 2.422 | 2.422 |
TABLE 2
In this embodiment, the half-image height is 2.322mm, and the field angle FOV is 70 °
Y1＝0.89；Y2＝0.9
r1/r2＝0.538
f2/f1＝-0.339
n1＝1.6612
-sag1+ct1+ct2+ct3＝1.6386
Et5＝0.47
F4/f3＝-2.178
f6/f＝-2.495
(r6-r7)/(r6+r7)＝-0.179
oal2/imh＝1.315
ct4/ct5＝0.83
abv1＝20.534
abv6＝23.529
Referring to fig. 1, each lens of the lens is symmetrical in shape, so that the lens is convenient to mold and produce, and the distance between lenses is reasonable, so that the structural design at the later stage is convenient.
Referring to fig. 3, a defocus graph of the lens represents a slight distance from a focal point of each field of view to an image plane, different curves represent different fields of view, a solid line is a meridian direction, and a dotted line is a sagittal direction. The vertex of each curve represents the MTF value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is, the closer the vertex is to the center, the better the imaging is
Referring to fig. 4, a vertical axis chromatic aberration diagram of the lens shows vertical axis chromatic aberration of a lens imaging system, the vertical axis chromatic aberration shows the difference of focal positions of wavelengths of each color on the whole image plane of the system, and the smaller the vertical axis chromatic aberration is, the better the light of the wavelengths of each color is converged is
Referring to fig. 5, the astigmatic field curvature of the lens shown, different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, the difference between the two curves is the astigmatism of the system, astigmatism and field curvature are important aberrations affecting the rays of the off-axis field of view, the imaging quality of the off-axis field of view is seriously affected by too much astigmatism, and the central and peripheral images are not in the same plane due to the field curvature.
Referring to fig. 6, the optical distortion curve of the lens is shown, the horizontal axis represents distortion value, and the vertical axis represents field height; the distortion does not affect the definition of an image, but can cause system deformation, the distortion of the system is less than 2%, and the influence on the imaging is small.
Example 2
TABLE 3
TABLE 4
| Flour mark | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 1 | -98.7315 | -0.4546 | 2.125079 | -8.6008 | 25.94825 | -54.6343 | 76.89378 | -68.5274 |
| 2 | -98.947 | -0.14763 | 0.518737 | -1.06528 | 0.289868 | 4.903216 | -13.955 | 18.1017 |
| 4 | -4.55608 | 0.030364 | -0.11931 | 0.197938 | -0.63163 | 1.083069 | -1.01828 | 0.352547 |
| 5 | 1.220581 | 0.008986 | -0.01505 | -0.00572 | -0.05505 | 0.11162 | -0.11549 | 0.036054 |
| 9 | -99 | 0.056433 | -0.06482 | -0.27441 | 0.842872 | -1.04951 | 0.716082 | -0.27916 |
| 10 | -9.99215 | 0.082343 | 0.000641 | -0.86133 | 1.999149 | -2.19555 | 1.370803 | -0.49978 |
| 11 | 55.74005 | -0.03632 | 0.089025 | -0.55473 | 1.191705 | -1.29009 | 0.787619 | -0.27469 |
| 12 | -16.7752 | 0.001607 | -0.84838 | 2.373941 | -3.31742 | 3.009838 | -1.85132 | 0.736449 |
| 13 | 97.17172 | 0.071142 | -0.95808 | 2.377969 | -3.31875 | 3.019418 | -1.79082 | 0.660088 |
| 14 | -10.2394 | 0.234754 | -0.66118 | 1.17674 | -1.48203 | 1.208111 | -0.60528 | 0.177432 |
| 15 | -3.00896 | 0.278466 | -0.02179 | 0.026883 | -0.26575 | 0.33756 | -0.19431 | 0.059229 |
| 16 | -1.94441 | 0.424582 | -0.33859 | 0.146809 | -0.02651 | -0.00447 | 0.003667 | -0.00091 |
In this embodiment, the half-image height is 2.322mm, and the field angle FOV is 70 °
Y1＝0.9
Y2＝0.9
r1/r2＝0.773
f2/f1＝-0.126
n1＝1.6612
-sag1+ct1+ct2+ct3＝1.816
Et5＝0.486
F4/f3＝-1.428
f6/f＝-0.7
(r6-r7)/(r6+r7)＝0.362
oal2/imh＝1.454
ct4/ct5＝2.688
abv1＝20.534
abv6＝23.529
Referring to fig. 7, the lens has symmetrical lens shapes, which is convenient for molding production, and has reasonable lens spacing and is convenient for later structural design.
Referring to fig. 8, a defocus graph of the lens represents a slight distance from a focal point to an image plane of each field of view, different curves represent different fields of view, a solid line is a meridian direction, and a dashed line is a sagittal direction. The vertex of each curve represents the MTF value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is, the closer the vertex is to the center, the better the imaging is
Referring to fig. 9, a vertical axis chromatic aberration diagram of the lens shows vertical axis chromatic aberration of the lens imaging system, the vertical axis chromatic aberration shows the difference of focal positions of the wavelengths of each color on the whole image plane of the system, and the smaller the vertical axis chromatic aberration is, the better the light of the wavelengths of each color is converged is
Referring to fig. 10, the astigmatic field curvature of the lens shown, different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, the difference between the two curves is the astigmatism of the system, astigmatism and field curvature are important aberrations affecting the rays of the off-axis field of view, the imaging quality of the off-axis field of view is seriously affected by too much astigmatism, and the field curvature causes the central and peripheral images to be out of a plane.
Referring to fig. 11, the optical distortion curve of the lens is shown, the horizontal axis represents distortion value, and the vertical axis represents field height; the distortion does not affect the definition of an image, but can cause system deformation, the distortion of the system is less than 2%, and the influence on the imaging is small.
TABLE 5
TABLE 6
In this embodiment, the half-image height is 2.322mm, and the field angle FOV is 70 °
Y1＝0.9；Y2＝0.9
r1/r2＝0.757
f2/f1＝-0.151
n1＝1.6612
-sag1+ct1+ct2+ct3＝1.793
Et5＝0.497
F4/f3＝-1.416
f6/f＝-0.677
(r6-r7)/(r6+r7)＝0.372
oal2/imh＝1.441
ct4/ct5＝2.399
abv1＝20.354
abv6＝23.53
Referring to fig. 12, the lens has symmetrical lens shapes, which is convenient for molding production, and has reasonable lens spacing, which is convenient for later structural design.
Referring to fig. 13, a defocus graph of the lens represents a slight distance from a focal point to an image plane of each field of view, different curves represent different fields of view, a solid line is a meridional direction, and a dashed line is a sagittal direction. The vertex of each curve represents the MTF value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is, the closer the vertex is to the center, the better the imaging is
Referring to fig. 14, a vertical axis chromatic aberration diagram of the lens is shown, which represents the vertical axis chromatic aberration of the lens imaging system, the vertical axis chromatic aberration represents the difference of the focal position of each color wavelength on the whole image plane of the system, and the smaller the vertical axis chromatic aberration, the better the light of each color wavelength is converged
Referring to fig. 15, the astigmatic field curvature of the lens shown, different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, the difference between the two curves is the astigmatism of the system, astigmatism and field curvature are important aberrations affecting the rays of the off-axis field of view, the imaging quality of the off-axis field of view is seriously affected by too much astigmatism, and the field curvature causes the central and peripheral images to be out of a plane.
Referring to fig. 16, the optical distortion curve of the lens is shown, the horizontal axis represents distortion value, and the vertical axis represents field height; the distortion does not affect the definition of an image, but can cause system deformation, the distortion of the system is less than 2%, and the influence on the imaging is small.
Claims (3)
1. A small-head high-resolution lens, in order from an object side to an image side, comprising:
the first lens P1 has negative refractive power, and the object side is a concave surface;
the second lens element P2 has a convex image-side surface with positive refractive power;
the prism is arranged between the first lens P1 and the second lens P2, and the included angle between the reflecting surface and the optical axis is 45 degrees;
the third lens element P3 with negative refractive power has a concave image-side surface, and at least one surface thereof is aspheric;
the fourth lens element P4 with positive refractive power has a convex object-side surface, and at least one surface of the fourth lens element is aspheric;
the fifth lens element P5 with positive refractive power has a convex image-side surface; the object side surface is a concave surface at the position close to the optical axis;
the sixth lens element P6 with negative refractive power has a concave image-side surface and an M-shaped configuration;
the prism is made of glass materials, the other six lenses are aspheric plastic lenses, the field angle FOV is larger than 70 degrees, and the optical back focus is larger than 0.55 degrees;
the following formula is satisfied:
Y1<0.9
Y2<0.9
0.538<r1/r2<0.775
-0.339<f2/f1<-0.126
n1>1.66
1.638<-sag1+ct1+ct2+ct3<1.816
Et5>0.47
-2.178<f4/f3<-1.416
-2.495<f6/f<-0.677
-0.179<(r6-r7)/(r6+r7)<0.372
oal2/imh>1.315
0.83<ct4/ct5<2.688
abv1<30
abv6<30
wherein Y1 is the half aperture of the first lens and Y2 is the half aperture of the second lens; r1 is the radius of curvature of the object-side surface of the first lens, r2 is the radius of curvature of the image-side surface of the first lens; f1 is the focal length of the first lens P1, f2 is the focal length of the second lens P2, f3 is the focal length of the third lens P3, f4 is the focal length of the fourth lens P4, f6 is the focal length of the sixth lens, and f is the effective focal length of the system; sag1 is the object-side edge rise of first lens P1; ct1 is the center thickness of the first lens P1, ct3 is the center thickness of the second lens P2, and ct2 is the center-to-center spacing of the first lens P1 to the second lens P2; et7 is the distance between the image side surface of the prism and the edge of the third lens P3; oal2 is the length of the third lens P3 to the phase plane; r6 is the curvature radius of the object-side surface of the sixth lens, and r7 is the curvature radius of the image-side surface of the sixth lens; ct4 is the center thickness of the fourth lens, and ct5 is the center thickness of the fifth lens; abv1 is the Abbe number of the first lens P1, abv6 is the Abbe number of the sixth lens P6;
2. the small-head high-resolution lens according to claim 1,
the half apertures of the first lens P1 and the second lens P2 are less than 0.9 mm.
3. Small-head periscope lens according to claim 1,
the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are even-order aspheric plastic lenses, and aspheric coefficients meet the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+A16y16
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
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| CN201811577059.1A CN111352211A (en) | 2018-12-23 | 2018-12-23 | Small-head high-resolution lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811577059.1A CN111352211A (en) | 2018-12-23 | 2018-12-23 | Small-head high-resolution lens |
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Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292832A (en) * | 1999-04-02 | 2000-10-20 | Olympus Optical Co Ltd | Real image type finder |
| JP2001133701A (en) * | 1999-11-09 | 2001-05-18 | Asahi Optical Co Ltd | Real image finder optical system |
| CN101349809A (en) * | 2008-08-29 | 2009-01-21 | 北京理工大学 | Zoom and focus system based on MOEMS |
| JP2011164237A (en) * | 2010-02-08 | 2011-08-25 | Kyocera Corp | Imaging lens |
| WO2012086199A1 (en) * | 2010-12-22 | 2012-06-28 | 富士フイルム株式会社 | Image pickup lens and image pickup device |
| CN102566011A (en) * | 2012-02-08 | 2012-07-11 | 中国科学院光电技术研究所 | Projection optical system |
| JP2013109081A (en) * | 2011-11-18 | 2013-06-06 | Olympus Corp | Inverted microscope |
| US20140092491A1 (en) * | 2012-10-02 | 2014-04-03 | Largan Precision Co., Ltd. | Imaging lens assembly |
| JP2014153599A (en) * | 2013-02-12 | 2014-08-25 | Canon Inc | Zoom lens and imaging apparatus including the same |
| JP2014163983A (en) * | 2013-02-21 | 2014-09-08 | Konica Minolta Inc | Imaging optical system |
| CN107346058A (en) * | 2016-05-06 | 2017-11-14 | 信泰光学(深圳)有限公司 | Panorama camera lens |
| CN107783251A (en) * | 2016-08-26 | 2018-03-09 | 大立光电股份有限公司 | Image lens, image capturing device and electronic device |
| US20180284393A1 (en) * | 2017-03-28 | 2018-10-04 | Largan Precision Co., Ltd. | Photographing optical lens assembly, image capturing unit and electronic device |
| CN108627954A (en) * | 2018-05-15 | 2018-10-09 | 辽宁中蓝电子科技有限公司 | A kind of imaging lens system group |
| US20180299647A1 (en) * | 2017-04-17 | 2018-10-18 | Largan Precision Co., Ltd. | Optical image capturing lens assembly, imaging apparatus and electronic device |
| CN208172360U (en) * | 2018-06-09 | 2018-11-30 | 辽宁中蓝电子科技有限公司 | The small four-piece type camera lens of image planes incident angle |
| CN208172361U (en) * | 2018-06-09 | 2018-11-30 | 辽宁中蓝电子科技有限公司 | A kind of large aperture high-pixel mobile phone lens |
| CN208172358U (en) * | 2018-05-15 | 2018-11-30 | 辽宁中蓝电子科技有限公司 | A kind of high pixel micromirrors head |
-
2018
- 2018-12-23 CN CN201811577059.1A patent/CN111352211A/en active Pending
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292832A (en) * | 1999-04-02 | 2000-10-20 | Olympus Optical Co Ltd | Real image type finder |
| JP2001133701A (en) * | 1999-11-09 | 2001-05-18 | Asahi Optical Co Ltd | Real image finder optical system |
| CN101349809A (en) * | 2008-08-29 | 2009-01-21 | 北京理工大学 | Zoom and focus system based on MOEMS |
| JP2011164237A (en) * | 2010-02-08 | 2011-08-25 | Kyocera Corp | Imaging lens |
| WO2012086199A1 (en) * | 2010-12-22 | 2012-06-28 | 富士フイルム株式会社 | Image pickup lens and image pickup device |
| JP2013109081A (en) * | 2011-11-18 | 2013-06-06 | Olympus Corp | Inverted microscope |
| CN102566011A (en) * | 2012-02-08 | 2012-07-11 | 中国科学院光电技术研究所 | Projection optical system |
| US20140092491A1 (en) * | 2012-10-02 | 2014-04-03 | Largan Precision Co., Ltd. | Imaging lens assembly |
| JP2014153599A (en) * | 2013-02-12 | 2014-08-25 | Canon Inc | Zoom lens and imaging apparatus including the same |
| JP2014163983A (en) * | 2013-02-21 | 2014-09-08 | Konica Minolta Inc | Imaging optical system |
| CN107346058A (en) * | 2016-05-06 | 2017-11-14 | 信泰光学(深圳)有限公司 | Panorama camera lens |
| CN107783251A (en) * | 2016-08-26 | 2018-03-09 | 大立光电股份有限公司 | Image lens, image capturing device and electronic device |
| US20180284393A1 (en) * | 2017-03-28 | 2018-10-04 | Largan Precision Co., Ltd. | Photographing optical lens assembly, image capturing unit and electronic device |
| US20180299647A1 (en) * | 2017-04-17 | 2018-10-18 | Largan Precision Co., Ltd. | Optical image capturing lens assembly, imaging apparatus and electronic device |
| CN108627954A (en) * | 2018-05-15 | 2018-10-09 | 辽宁中蓝电子科技有限公司 | A kind of imaging lens system group |
| CN208172358U (en) * | 2018-05-15 | 2018-11-30 | 辽宁中蓝电子科技有限公司 | A kind of high pixel micromirrors head |
| CN208172360U (en) * | 2018-06-09 | 2018-11-30 | 辽宁中蓝电子科技有限公司 | The small four-piece type camera lens of image planes incident angle |
| CN208172361U (en) * | 2018-06-09 | 2018-11-30 | 辽宁中蓝电子科技有限公司 | A kind of large aperture high-pixel mobile phone lens |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113703128A (en) * | 2020-05-20 | 2021-11-26 | 大立光电股份有限公司 | Imaging optical lens assembly, image capturing device and electronic device |
| CN113703128B (en) * | 2020-05-20 | 2022-12-30 | 大立光电股份有限公司 | Imaging optical lens assembly, image capturing device and electronic device |
| US11841550B2 (en) | 2020-05-20 | 2023-12-12 | Largan Precision Co., Ltd. | Imaging optical lens assembly, image capturing unit and electronic device |
| CN111830683A (en) * | 2020-09-01 | 2020-10-27 | 辽宁中蓝光电科技有限公司 | A high-resolution lens with a periscope small head |
| CN112558282A (en) * | 2020-12-22 | 2021-03-26 | 厦门力鼎光电股份有限公司 | Wide-angle optical imaging lens |
| CN112578535A (en) * | 2020-12-23 | 2021-03-30 | 江西晶超光学有限公司 | Periscopic optical lens group, lens module and electronic equipment |
| CN115993700A (en) * | 2021-10-20 | 2023-04-21 | 大立光电股份有限公司 | Imaging system mirror group, imaging device and electronic device |
| CN114609754A (en) * | 2022-03-15 | 2022-06-10 | 浙江舜宇光学有限公司 | Optical imaging system and electronic device |
| CN114609754B (en) * | 2022-03-15 | 2023-08-08 | 浙江舜宇光学有限公司 | Optical imaging system and electronic device |
| CN118131440A (en) * | 2024-01-30 | 2024-06-04 | 武昌理工学院 | A projection lens and HUD device |
| CN118131440B (en) * | 2024-01-30 | 2024-08-20 | 武昌理工学院 | Projection lens and HUD equipment |
| CN119882183A (en) * | 2025-01-02 | 2025-04-25 | 昆山丘钛微电子科技股份有限公司 | Long-focus lens and electronic equipment |
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