JP2007316810A - Magnetic sheet, its manufacturing method and non-contact ic medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and highly effective magnetic sheet (separate sheet 4), its manufacturing method and a non-contact IC medium 1. <P>SOLUTION: This magnetic sheet is provided with a first magnetic layer 41 and a second magnetic layer 42, where a plurality of magnetic tapes 41a and 42a formed of magnetic substance, such as tape with fixed width, are arranged in parallel, and the first magnetic layer 41 and the second magnetic layer 42 are arranged so as to be superimposed on each other, while the directions of the magnetic tapes 41a and 42a made to cross so that a separate sheet 4 can be formed. The first magnetic layer 41 and the second magnetic layer 42 are configured so that the adjacent magnetic tapes 41a and 42a will not be superimpose on each other, and that a gap between the adjacent magnetic tapes 41a and 42a can be hardly generated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a magnetic sheet, a manufacturing method thereof, and a non-contact IC medium that improve communication from one side with respect to an antenna provided on the non-contact IC medium, for example, and block communication from the other.

  Conventionally, a non-contact IC medium that can store data and can perform data communication without contact with a reader / writer has been provided. This non-contact IC medium is provided with, for example, a loop antenna and an IC chip, and can communicate with the reader / writer in a non-contact manner by receiving the induction electromagnetic field irradiated by the antenna of the reader / writer with the loop antenna.

  With respect to such a non-contact IC medium, a mutual interference control method has been proposed that prevents fluctuations in resonance frequency due to mutual interference between non-contact IC media in a state where a plurality of non-contact IC media are arranged (Patent Document 1). reference). This mutual interference control method suppresses mutual interference between adjacent non-contact IC media in an arranged state by providing a shielding sheet having a diameter equal to or larger than the loop diameter of the loop antenna of the non-contact IC media.

  In order to improve the communication characteristics of a non-contact IC medium, an antenna device in which a flat soft magnetic material is provided between an antenna and a metal surface on the back has been proposed (see Patent Document 2). This antenna device is said to be able to improve productivity and communication characteristics by forming a soft magnetic body with an aggregate of a plurality of magnetic material pieces.

  However, since the latter antenna device is an assembly of a plurality of magnetic material pieces, electromagnetic waves pass through the gaps between adjacent magnetic material pieces. This passing electromagnetic wave is considered to be shielded by a metal plate provided on the back side of the aggregate of magnetic material pieces, but if there is no metal plate, the effect of improving the communication characteristics by passing through the electromagnetic wave is diminished. There is a problem that.

  In addition, when trying to realize the former mutual interference control method using an assembly of magnetic material pieces proposed in the latter antenna device, electromagnetic waves pass through the assembly of magnetic material pieces, so that the metal plate Otherwise, there is a problem that mutual interference cannot be prevented.

  When the magnetic material piece assembly and the metal plate are made into a two-layer structure as described above, it is necessary to prepare a plurality of types of materials for inventory management and to manage the stock, which is troublesome and costly.

JP 2004-246816 A JP 2006-101370 A

  In view of the above problems, an object of the present invention is to provide a low-cost and highly effective magnetic sheet, a manufacturing method thereof, and a non-contact IC medium.

  The present invention includes a plurality of magnetic layers in which a plurality of magnetic tapes formed in a tape shape having a certain width with a magnetic material are arranged in parallel, and the magnetic layers are arranged in a superposed manner with the directions of the magnetic tapes intersecting each other. It is a magnetic sheet.

  As an aspect of the present invention, the magnetic sheet comprises a step of creating a first magnetic layer by arranging a plurality of magnetic tapes formed in a tape shape having a certain width with a magnetic material on a base material sheet as a base material. A step of forming a second magnetic layer by arranging a plurality of magnetic tapes formed in a tape shape having a certain width with a magnetic material on the first magnetic layer in a direction crossing the magnetic tape of the first magnetic layer; And can be manufactured.

  Further, the present invention provides a non-contact IC medium comprising an IC chip that executes a control operation, an antenna connected to the IC chip for non-contact communication, and the magnetic sheet disposed so as to cover one side of the antenna. It is characterized by being.

  According to the present invention, it is possible to provide a low-cost and highly effective magnetic sheet, a manufacturing method thereof, and a non-contact IC medium.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view of the non-contact IC tag 1, and FIGS. 2 and 3 are explanatory views for explaining the configuration of the separate sheet 4.

  The non-contact IC tag 1 has a top sheet 2, a first non-contact IC label 3, a separate sheet 4, a second non-contact IC label 5, and a back sheet 6 that are superposed and bonded in this order from the top to form a tag shape. Has been.

  The top sheet 2 corresponding to the upper surface is formed in a rectangular plate shape having an appropriate size from a material such as resin having an appropriate rigidity, and the surface is constituted by a decorative surface on which printing or the like has been applied.

  The first non-contact IC label 3 is provided with an IC chip 30a and a loop antenna 30b printed on one side of the film. The IC chip 30a has a first function of communicating in a frequency band of 0.8 GHz, for example. Further, the film is provided between the IC chip 30 a and the loop antenna 30 b and the separate sheet 4 on the surface of the film opposite to the separate sheet 4.

  As shown in FIG. 2, the separate sheet 4 is a sheet in which magnetic tapes 41 a and 42 a are arranged in a lattice pattern on the entire surface of a rectangular plate-like base sheet 45 having an appropriate size.

  More specifically, as shown in the vertical sectional side view of FIG. 2A, the separate sheet 4 has the first magnetic layer 41 polymerized and bonded to the entire upper surface of the base sheet 45, and the entire upper surface of the first magnetic layer 41. The second magnetic layer 42 is polymerized and bonded. The first magnetic layer 41 and the second magnetic layer 42 are polymerized to form a polymerized magnetic layer 40.

  As shown in the plan view of FIG. 2B, the first magnetic layer 41 has a magnetic tape 41a adhered in a straight line along the short direction of the base sheet 45. The magnetic tape 41a is a magnetic tape. They are arranged in parallel and close to each other in the longitudinal direction of the base material sheet 45 that is the width direction of 41a. Adjacent magnetic tapes 41a do not overlap each other and are closely aligned and bonded so that there is almost no gap between them.

  As shown in the plan view of FIG. 2C, the second magnetic layer 42 has a magnetic tape 42a adhered in a straight line along the longitudinal direction of the base sheet 45, and the magnetic tape 42a is a magnetic tape 42a. Are arranged in parallel and close to each other in the short direction of the base sheet 45 which is the width direction of the sheet. Adjacent magnetic tapes 42a do not overlap each other and are closely aligned and bonded so that there is almost no gap between them.

  As shown in the plan view of FIG. 3A, the first magnetic layer 41 and the second magnetic layer 42 are laminated such that the magnetic tape 41a and the magnetic tape 42a are orthogonal to each other. Therefore, when viewed in plan, the gap where the magnetic tape 41a or the magnetic tape 42a does not exist is between the magnetic tapes 41a as shown in the AA and BB partial enlarged plan views of FIG. Only the intersection 43 where the first boundary 41b, which is the boundary, and the second boundary 42b, which is the boundary between the magnetic tapes 42a, intersects.

  The magnetic tape 41a and the magnetic tape 42a are magnetic tapes formed in a straight tape shape with a constant thickness and a constant width using a material such as a soft magnetic material. Specific materials include iron oxide, chromium, nickel, ferrite, amorphous alloy, permalloy, electromagnetic steel, silicon iron, Fe-AL alloy, Sendust alloy, carbonyl iron, or a mixture of these materials. be able to.

  In this embodiment, the magnetic tape 41a and the magnetic tape 42a are magnetic tapes containing iron oxide, chromium, nickel, etc. contained in a PET base, preferably video cassette tape, open reel tape, music cassette tape, DAT cassette. Magnetic tapes of storage cassette media that are stored magnetically, such as tapes and 8 mm video cassette tapes, are reused as they are. Reusing as it is means that the physical shape is reused as it is, and the magnetic state of the magnetic tape may be reused as it is or after demagnetization.

The separate sheet 4 is manufactured by the following steps.
Step 1: A plurality of magnetic tapes 41a are arranged in parallel in the width direction (longitudinal direction of the base sheet 45) with the longitudinal direction of the magnetic tape 41a facing the short direction of the base sheet 45 over the entire upper surface of the base sheet 45. Adhere to. The magnetic tape 41a is brought into close contact with almost no gap, and the plurality of magnetic tapes 41a constitute the first magnetic layer 41.
Step 2: The longitudinal direction of the magnetic tape 42a is directed to the entire upper surface of the first magnetic layer 41 in the longitudinal direction of the first magnetic layer 41, and the magnetic tape 42a is oriented in the width direction (the short direction of the first magnetic layer 41). Adhesive in parallel. The magnetic tape 42a is brought into close contact with almost no gap, and the plurality of magnetic tapes 42a constitute the second magnetic layer 42.
By this step, the separate sheet 4 in which the magnetic tapes 41a and 42a are arranged vertically and horizontally is completed.

As shown in FIG. 1, the second non-contact IC label 5 is provided with an IC chip 50a printed on a film and a loop antenna 50b. The IC chip 50a has a second function of communicating in a 13.56 MHz frequency band, for example.
Further, the IC chip 50 a and the loop antenna 50 b are provided on the surface of the film opposite to the separate sheet 4 so that the film is sandwiched between the IC chip 50 a and the loop antenna 50 b and the separate sheet 4.

  The back sheet 6 corresponding to the bottom surface is formed in a rectangular plate shape having an appropriate size with a material such as resin having an appropriate rigidity, and includes a magnetic stripe 36 on the back surface which is an outer surface. The portion other than the magnetic stripe 36 on the back surface is a decorative surface on which printing or the like has been performed.

  With the separate sheet 4 of the non-contact IC tag 1 described above, electromagnetic waves can be reflected by the first magnetic layer 41 and the second magnetic layer 42 to improve the communication characteristics of the loop antennas 30b and 50b. Electromagnetic waves can be prevented from passing through the sheet 4.

  The first magnetic layer 41 may pass or wrap around the electromagnetic wave at the first boundary 41b which is the boundary of the magnetic tape 41a alone, but the magnetic tape 42a is arranged in parallel in a direction orthogonal to the magnetic tape 41a. By laminating the second magnetic layer 42, the size of the intersection 43 between the second boundary 42b and the first boundary 41b of the magnetic tape 42a can be made as small as possible to prevent electromagnetic waves from passing therethrough. In other words, the first boundary 41b other than the intersection point 43 is covered with the magnetic tape 42a, and the second boundary 42b other than the intersection point 43 is covered with the magnetic tape 41a. .

  Further, as shown in the perspective view of FIG. 4, the IC chip 30a is transmitted from a reader / writer (not shown) and passes through the top surface sheet 2 by using the loop antenna 30b by the non-contact IC tag 1 having the above-described configuration. Data communication can be performed without contact with the reader / writer by the incoming electromagnetic wave G1. At this time, since the electromagnetic wave G1 is blocked by the separate sheet 4, it does not reach the IC chip 50a and the loop antenna 50b existing on the other side of the separate sheet 4, and the IC chip 50a and the loop antenna 50b do not react. Therefore, it is possible to prevent the IC chip 50a from inhibiting the communication of the IC chip 30a with respect to the electromagnetic wave G1. Further, it is possible to prevent the loop antenna 50b from interfering with the loop antenna 30b and hindering communication of the IC chip 30a.

  Conversely, the IC chip 50a can perform data communication with the reader / writer in a non-contact manner by the electromagnetic wave G2 transmitted from the reader / writer (not shown) and passing through the lower back sheet 6 using the loop antenna 50b. At this time, since the electromagnetic wave G2 is blocked by the separate sheet 4, it does not reach the IC chip 30a and the loop antenna 30b existing on the other side of the separate sheet 4, and the IC chip 30a and the loop antenna 30b do not react. Therefore, it is possible to prevent the IC chip 30a from inhibiting the communication of the IC chip 50a with respect to the electromagnetic wave G2. Further, it is possible to prevent the loop antenna 30b from interfering with the loop antenna 50b to hinder communication of the IC chip 50a.

  Moreover, since the separate sheet 4 can be manufactured with the magnetic tapes 41a and 42a without using an iron plate or the like, it can be manufactured at low cost. In particular, if a magnetic tape such as an old video cassette tape to be discarded is reused for the magnetic tapes 41a and 42a, it can be manufactured at a very low cost. Moreover, if it is reused in this way, it is possible to reduce the amount of magnetic tape discarded and contribute to environmental protection.

  Since the magnetic tapes 41a and 42a are arranged in parallel with each other, the width of the gap between the first boundary 41b and the second boundary 42b does not change depending on the part, and the first magnetic layer 41 and the second magnetic layer 42 are not changed. Stable quality can be obtained over the entire surface.

  Since the gap interval between the first boundary 41b and the second boundary 42b is the same, the passage of electromagnetic waves is not allowed depending on the part, and stable quality can be obtained.

As shown in the perspective view of FIG. 5, the separate sheet 4 has an electromagnetic wave blocking layer 47 formed in a sheet shape with an electromagnetic wave blocking material such as an aluminum material or an iron material between two upper and lower polymerized magnetic layers 40. It is good also as a structure. In this case, an insulating layer 49 formed in a sheet shape with an insulating material such as PET or vinyl is preferably interposed between the electromagnetic wave shielding layer 47 and the polymerized magnetic layer 40. In the example shown in the figure, the thickness of each layer is shown as being thick so as to be easily understood. However, in actuality, it is preferable that the thickness is approximately the same as that of the separate sheet 4 shown in FIG.
With this configuration, it is possible to more reliably prevent the IC chip 30a and the IC chip 50a provided on both surfaces of the separate sheet 4 from interfering with each other during communication.

  Moreover, although the magnetic tape 41a and the magnetic tape 42a employ | adopted the magnetic tape of the same raw material, the same width, and the same thickness, you may employ | adopt the magnetic tape of a different width and different thickness with a different material. For example, the magnetic tape 41a may be a video cassette tape and the magnetic tape 42a may be a DAT cassette tape. Even in this case, the above-described electromagnetic wave prevention effect, communication performance improvement effect, and low cost effect can be obtained.

  In addition, the first magnetic layer 41 and the second magnetic layer 42 have a double structure, but the first magnetic layer 41 and the second magnetic layer 42 are further superposed on each other to form a four-layer structure. The above multilayer structure can be obtained. Thereby, the separate sheet | seat 4 and the non-contact IC tag 1 from which a characteristic differs can be manufactured only by adjusting the frequency | count of overlapping according to the electromagnetic wave shielding performance requested | required.

  Further, the communication frequency used by the IC chip 30a and the communication frequency used by the IC chip 50a may be the same frequency. Also in this case, since the electromagnetic waves of the reader / writer do not reach the back side of the separate sheet 4, stable contactless communication can be performed with only one of the IC chip 30a and the IC chip 50a.

  Moreover, you may provide as the non-contact IC tag 1 which does not provide the 2nd non-contact IC label 5, and permits communication only from one side. Also in this case, the communication performance of the first non-contact IC label 3 can be improved by the separate sheet 4. Moreover, even if a metal plate, an electronic device, etc. exist in the lower surface side (side without the 1st non-contact IC label 3) of the separate sheet | seat 4, the 1st non-contact IC label 3 can communicate non-contact without a problem.

  Further, the separate sheet 4 may be provided as a single card. Thereby, the non-contact IC tag 1 can be manufactured using the separate sheet 4. Further, when the first non-contact IC label 3 is provided as a single unit, the user can use the separate non-contact IC label 3 by superposing the separate sheet 4 thereon. Even in this case, the separate sheet 4 can improve the communication of the first non-contact IC label 3, and can block electromagnetic waves from the separate sheet 4 side to the first non-contact IC label 3.

  When the separate sheet 4 is provided as a single card, a constant width gap is provided at the first boundary 41b of the adjacent magnetic tape 41a, and a constant width gap is provided at the second boundary 42b of the adjacent magnetic tape 42a. Alternatively, a hole having a constant size may be formed at the intersection 43. In this case, by adjusting the size of the hole and the width of the magnetic tapes 41a and 41b as appropriate, a low-frequency lower than a certain frequency is cut off and a passing electromagnetic wave adjustment sheet that allows a higher frequency to pass is provided. be able to.

In correspondence between the configuration of the present invention and the above-described embodiment,
The non-contact IC medium of the present invention corresponds to the non-contact IC tag 1 of the embodiment,
Similarly,
The magnetic sheet corresponds to the separate sheet 4,
The IC chip corresponds to the IC chip 30a,
The antenna corresponds to the loop antenna 30b,
The magnetic layers correspond to the first magnetic layer 41 and the second magnetic layer 42,
The gap corresponds to the gap of the first boundary 41b and the gap of the second boundary 42b,
Another IC chip and antenna correspond to the IC chip 50a and the loop antenna 50b,
The magnetic material corresponds to iron oxide, chromium, nickel, etc.
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

The disassembled perspective view of a non-contact IC tag. Explanatory drawing explaining the structure of a separate sheet | seat. Explanatory drawing explaining the structure of a separate sheet | seat. The perspective view of a non-contact IC tag. The perspective view of the separate sheet | seat of another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Non-contact IC tag, 4 ... Separate sheet, 30a, 50a ... IC chip, 30b, 50b ... Loop antenna, 40 ... Polymerization magnetic layer, 41 ... 1st magnetic layer, 42 ... 2nd magnetic layer, 41a, 42a ... Magnetic tape, 41b ... first boundary, 42b ... second boundary, 45 ... base sheet, 47 ... insulating layer, 49 ... electromagnetic wave shielding layer

Claims (9)

A plurality of magnetic layers in which a plurality of magnetic tapes formed in a tape shape having a certain width with a magnetic material are arranged in parallel,
A magnetic sheet in which the magnetic layers are arranged in a polymerized manner so that the directions of the magnetic tapes cross each other. The magnetic sheet according to claim 1, wherein the magnetic layer is configured such that adjacent magnetic tapes do not overlap each other. The magnetic sheet according to claim 1, wherein the magnetic layer has a configuration in which there is almost no gap between the adjacent magnetic tapes. The magnetic sheet according to claim 1, wherein the intersection is an orthogonal intersection. A plurality of the magnetic layers are polymerized by crossing the directions of the magnetic tapes to form a polymerized magnetic layer,
Equipped with an electromagnetic wave blocking layer made of an electromagnetic wave blocking material that blocks electromagnetic waves,
The magnetic sheet according to any one of claims 1 to 4, wherein the polymerized magnetic layer is provided on both surfaces of the electromagnetic wave shielding layer. The magnetic sheet according to claim 5, wherein an insulating layer made of an insulating material is interposed between the electromagnetic wave shielding layer and the polymerized magnetic layer. An IC chip that executes a control operation;
An antenna connected to the IC chip for non-contact communication;
A non-contact IC medium comprising: the magnetic sheet according to claim 1 disposed so as to cover one side of the antenna. The non-contact IC medium according to claim 7, further comprising another IC chip and an antenna on the other surface of the magnetic sheet. A step of creating a first magnetic layer by arranging a plurality of magnetic tapes formed in a tape shape having a certain width with a magnetic material on a base material sheet as a base material,
Arranging a plurality of magnetic tapes formed in a tape shape having a certain width with a magnetic material on the first magnetic layer in a direction crossing the magnetic tape of the first magnetic layer to form a second magnetic layer; A magnetic sheet manufacturing method comprising:

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