JP2001260577A - Manufacturing method of optical recording medium, optical recording medium and manufacturing device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the manufacturing method of an optical recording medium, capable of transferring a computer hologram at a correct position without any positional deviation and capable of transferring simultaneously only the necessary group of the computer holograms. SOLUTION: In the manufacturing method of the optical recording medium, only a part corresponding to a hologram forming area is transferred from a transfer foil having at least a separating layer 6, a hologram layer 8 comprising the hologram forming area partially, a protective layer consisting of a resin having a refractive index different from that of the hologram layer or a metallic refractory layer and an adhesive layer 10. According to this method, the computer hologram can be transferred at the correct position without any positional deviation and only the group of necessary computer holograms can be transferred simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium capable of easily preventing forgery and falsification and discriminating the authenticity thereof, and particularly relates to a prepaid card, credit card, cash card, ID
The present invention relates to a method for manufacturing an optical recording medium suitable for a card, a passport, and the like, an optical recording medium, and an apparatus for manufacturing the same.

[0002]

2. Description of the Related Art In general, for the purpose of preventing counterfeiting and unauthorized use of credit cards, bank cash cards, and the like, those in which an image such as a hologram is adhered to such cards have been put to practical use. These holograms visually recognize a single hologram image due to interference of white light. There is a method of applying the image based on such a hologram to determine the authenticity of the optical recording medium, that is, to determine whether the optical recording medium is a genuine optical recording medium or a counterfeit product that is not authorized at all. Only one hologram image can be recognized. Further, a hologram whose image is visible with the naked eye can produce a pseudo image relatively easily, and it has not been possible to completely prevent the production of a counterfeit product.

Accordingly, the present applicant has filed Japanese Patent Application No. 11-1679.
No. 45 proposes an optical recording medium equipped with an IC, which is effective in preventing forgery as having a machine-readable hologram. Here, an example of a conventional optical recording medium and a manufacturing method thereof will be described. 13 is a plan view showing a conventional transfer foil, FIG. 14 is an enlarged sectional view of the transfer foil shown in FIG. 13, and FIG. 15 is a schematic configuration diagram showing a conventional optical recording medium manufacturing apparatus for transferring a hologram from the transfer foil. ,
FIG. 16 is an enlarged view showing a peeled state of a support when transferring is performed using a conventional transfer foil, and FIG. 17 is a plan view showing a completed conventional optical recording medium. FIG. 14 shows the transfer foil upside down. As shown in FIGS. 13 and 14, the transfer foil 2 is composed of a release layer 6, a hologram layer 8, a reflection layer 10, and an adhesive layer on a resin base film 4 as a support made of PET (polyethylene terephthalate) or the like. 12 are sequentially laminated.

[0004] Specifically, as described above, a release layer 6 is formed on a heat-resistant base film 4 such as PET, and an ultraviolet curable resin is applied thereon. Generated
Hologram (hereinafter, also referred to as CGH) 14 is brought into contact with a stamper on which it is recorded, and is cured by irradiating the stamper with ultraviolet light to form a hologram layer 8. Further, a reflective layer 10 and an adhesive layer 12 made of a metal film of aluminum, gold, TiO ₂ or the like are formed thereon, thereby forming a heat-sealed transfer foil 2 for thermal transfer. Here, as shown in FIG. 13, the CGH 14 includes an elongated tracking CGH 14A for tracking and data CGH 14B for data arranged on both sides thereof. The data CGH14B generates a plurality of types of diffraction patterns by irradiating the data CGH14B with monochromatic light. Further, the tracking CGH 14A is the data CGH1.
A timing pulse for imaging the 4B diffraction pattern by the image sensor is generated as a diffracted light, which is received by a light receiving element such as a photodetector and used as a trigger of the image sensor.

In order to thermally transfer the CGH 14 of the transfer foil 2 to a recording medium base serving as an optical recording medium, as shown in FIG. 15, a roll-shaped transfer foil is used to transfer a desired CGH 14 onto a recording medium base 16. The hot stamp 18 heated to about 140 ° C. at a predetermined CGH 14 is pressed onto the recording medium base 16 via the transfer foil 2. As a result, only the portion heated and heated on the recording medium base 16 by the heat sealing of the transfer foil 2 is transferred. Thereafter, as shown in FIG. 16, the release layer 6 and the base film 4 are integrally peeled off from other portions, and the CGHs 14 are formed on the recording medium base 16. It is easy to print an image on the recording medium base 16 by a retransfer type printing machine or to form a protective film,
Thus, the optical recording medium 20 as shown in FIG. 17 is formed. In this case, an area having the same area as the contact area of the hot stamp 18 in FIG. 15, that is, the entire transfer area 22 (see FIG. 13) enclosed by a square in FIG. 13 is transferred to the recording medium base 16 side.

[0006]

By the way, generally,
The hot stamp 18 and the recording medium base 16 can be aligned with each other with very high precision. On the other hand, the transfer foil 2 has a thickness of about several tens μm and is thin. The relative relationship between the transfer foil 2 and the recording medium base 16 during transfer is easily shifted.
As a result, there is a problem that the CGH 14 group may be transferred to a shifted position instead of a regular position on the recording medium base 16. In addition, depending on the type of the optical recording medium 20, instead of using the entire group of transferred CGHs 14, a part of them may be erased and the remaining CGHs may be deleted.
In some cases, 14 groups may be used. In this case, however, it is necessary to perform a method of erasing a part of the computer generated hologram, and this step has been a factor hindering the cost reduction of the optical recording medium.

[0007] The present invention focuses on the above problems,
The purpose of the present invention is to provide an optical recording system capable of transferring a computer-generated hologram to an accurate position without displacement and simultaneously transferring only a necessary group of computer-generated holograms. Media production method,
An object of the present invention is to provide an optical recording medium manufacturing apparatus and an optical recording medium.

[0008]

According to the invention defined in claim 1, the present invention provides a hologram layer partially including a release layer, a hologram formation region, and a resin having a different refractive index from the hologram layer. A method for manufacturing an optical recording medium, wherein only a portion corresponding to the hologram forming area is transferred from a transfer foil having at least a layer or a metal reflective layer and an adhesive layer. In this case, for example, as defined in claim 2, the hologram layer includes:
It is also possible to have a plurality of hologram formation areas in which a plurality of different types of information are recorded, and to transfer only a portion corresponding to the selected hologram formation area among the plurality of hologram formation areas.

[0009] The invention as defined in claim 3 is that the support,
A transfer layer having at least a release layer, a hologram layer partially including a hologram formation region, a protective layer made of a resin having a different refractive index from the hologram layer, and a metal reflection layer, and an adhesive layer; The optical recording medium is characterized in that only a portion corresponding to is transferred. The invention as defined in claim 4 includes, on a support, a release layer, a hologram layer partially including a hologram formation region, a protective layer made of a resin having a different refractive index from the hologram layer, or a metal reflection layer; In an optical recording medium manufacturing apparatus for transferring a desired portion to a recording medium base from a transfer foil having at least an adhesive layer, the device has a plurality of heating blocks for transferring only a portion corresponding to the hologram forming region of the transfer foil. This is an apparatus for manufacturing an optical recording medium. In this case, for example, the plurality of heating blocks have a structure capable of selectively controlling transfer or non-transfer.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing an optical recording medium, an optical recording medium and an apparatus for manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a plan view showing a transfer foil used for carrying out the present invention, FIG. 2 is an enlarged sectional view of the transfer foil shown in FIG. 1, and FIG. 3 is a perspective view showing a hot stamp of the optical recording medium manufacturing apparatus according to the present invention. FIG. 4 is an enlarged plan view showing a transfer foil after thermal transfer, and FIG. 5 is a plan view showing an optical recording medium of the present invention. The same components as those shown in FIGS. 13 to 17 described above are denoted by the same reference numerals and described. FIG. 2 shows the transfer foil upside down.

First, as shown in FIGS. 1 and 2, a transfer foil 30 is formed on a resin base film 4 as a support made of PET (polyethylene terephthalate) or the like, on a release layer 6, a hologram layer 8, and a reflection layer. It is formed by sequentially laminating the layer 10 and the adhesive layer 12.

More specifically, as described above, a release layer 6 is formed on a heat-resistant base film 4 such as PET, and an ultraviolet curable resin is applied thereon. ) 14 is brought into contact with a recorded stamper, and cured by irradiating the stamper with ultraviolet light to form a hologram layer 8. Furthermore, aluminum on it,
A reflective layer 10 and an adhesive layer 12 made of a metal film such as gold or TiO ₂ are formed, and thereby a heat-sealed transfer foil 30 for thermal transfer is formed. Here, as shown in FIG. 1, as the CGH 14, a long and narrow tracking CGH 14 for tracking divided into a large number of continuous rectangles is used.
A and a plurality of rectangular data CGHs 14B arranged on both sides thereof. Interference fringes that generate different diffracted lights are formed in each of the rectangular sections. The above data CGH14B
Irradiates this with monochromatic light to generate a plurality of types of diffraction patterns. In addition, the tracking CGH
14A generates, as diffracted light, a timing pulse for imaging the diffraction pattern of the data CGH 14B with the imaging device, and receives this by a light-receiving element such as a photodetector;
Used as a trigger for the image sensor. Here, it should be noted that each CGH 14 (14A, 14A,
The size of 14B) is set to be larger by a predetermined size than the area of the area where the thermal transfer is actually performed in the post-process in consideration of a margin for the positional deviation. In the case shown in FIG. 1, the data CGHs 14B and the data CGHs 14B and the tracking CGHs 14A are provided continuously in contact with each other. If they are provided, they need not be provided continuously.

To thermally transfer the group of CGHs 14 of the transfer foil 30 onto a recording medium base serving as an optical recording medium, a manufacturing apparatus as described above with reference to FIG. 15 is used. Use That is, the desired CGH is recorded on the recording medium base 16 (see FIG. 15).
14 is transferred from the roll-shaped transfer foil 2 to transfer the same, and is placed thereon, and a hot stamp 32 is heated via the transfer foil 30 as shown in FIG. Pressure is applied to the medium base 16. As a result, only the portion heated and pressed on the recording medium base 16 by the heat sealing of the transfer foil 30 is transferred.

Here, the hot stamp 32 does not have its entire lower surface in contact with the transfer foil 30 but only a selected portion. That is, as shown in FIG.
In this case, a plurality of heating blocks 34 are further projected downward.
Are provided, and these are heated. Specifically, the heating block 34
And a plurality of heating blocks for data 34B provided on both sides thereof in correspondence with the data CGH 14B.

Here, each data heating block 34B
Are not in contact with each other and are arranged in a state of being separated from each other. The contact surface area of the tracking heating block 34A and the contact surface area of each of the data heating blocks 34B are set to be smaller than the corresponding tracking CGH 14A and each data CGH 14B by a predetermined area. The positional deviation of the transfer foil 30 is given a margin so that the positional deviation can be absorbed. Therefore, by performing transfer using the hot stamp 32 having the above-described configuration,
Only the CGH 14 corresponding to the contact surface at the lower end of each of the heating blocks 34A and 34B is thermally transferred onto the recording medium base 16.

Thereafter, as shown in FIG. 16, the peeling layer 6 and the base film 4 are integrally peeled off from other portions, and a group of CGHs 14 is formed on the recording medium base 16. It is possible to easily print an image or form a protective film on the recording medium base 16 by a retransfer type printing machine, thereby forming an optical recording medium 20 as shown in FIG. . The state of the transfer foil 30 after the thermal transfer is
This is shown in FIG. 4. In FIG. 4, a portion drawn with a white square corresponds to the thermally transferred CGH. Here, FIG.
This shows a situation when the transfer foil 30 is set at a proper position without causing a positional shift between the hot stamp 32 and the recording medium base 16, and the center of each CGH area is thermally transferred. On the other hand, FIG. 4B shows an example of a situation when the transfer foil 30 is set in a state where the transfer foil 30 is displaced between the hot stamp 32 and the recording medium base 16. Thermal transfer is performed on one side in the CGH area, that is, from a portion biased in the direction of displacement.

However, as shown in FIG.
Even if the transfer foil 30 is set in a state where the transfer foil 30 is displaced, the area of each of the CGHs 14A and 14B is set to be large in view of a margin, and the hot stamp 32 and the recording medium base 16 are both accurately aligned. Therefore, CGH can be thermally transferred to an accurate position on the recording medium base 16. In this case, the area of each of the CGHs 14A and 14B is set wide as described above to provide a margin, but the amount of the margin is ± H1 in the vertical direction in the figure as shown in FIG. The width may be ± H2 in the left-right direction, and this width may be set, for example, empirically to the maximum deviation amount generated in the transfer foil 30.

In the above embodiment, the hot stamp 3
2, all the heating blocks 34A and 34B are brought into pressure contact with the transfer foil 30. However, the present invention is not limited to this. As shown in FIG. 6, each heating block, particularly each data heating block 34B, It is also possible to use a structure that can appear and disappear without contacting the transfer foil 30, that is, can be retracted. FIG. 6 shows a state in which the data heating block 34B indicated by oblique lines is retracted. Data heating block 34
In order to make B retractable, an electromagnetic mechanism such as a solenoid, a motor driving mechanism, and a block moving means such as an air driving mechanism may be provided for each block 34B in the main body of the hot stamp 32. For example of the 20 data heating block 34B, if as always retreated five and can have the meaning of ₂₀ C ₅ kinds of formula mathematical combinations. When a hot stamp 32 as shown in FIG. 6 is transferred to the transfer foil 30 by heating and pressing, an optical recording medium on which a CGH pattern is transferred as shown in FIG. 7 is obtained.

The state of the transfer foil 30 after the transfer is shown in an enlarged manner in FIG. 8, and the data CGH 14B corresponding to the data heating block 34B that has not contacted remains without being thermally transferred. Further, in the above embodiment, the hot stamp having the heating block 34 at the lower end is used. Instead, as shown in FIG. A thermal head 42 having a plurality of heat generating chips 40 capable of controlling the temperature may be used. According to this,
If only a desired portion of the CGH 14 is transferred from the transfer foil 30 shown in FIG. 6, only the desired CGH can be transferred as shown in FIG. Such a structure is built in, for example, a card printer or a passport printer, and simultaneously transports the card or passport and the transfer foil to the CG at an accurate position.
H can be transferred.

In the above embodiment, the recording medium base 1
The tracking CGH 14A when thermally transferred onto 6 is
As shown in FIG. 5, for example, the state is set so as to be continuous in a straight line in the length direction of the base 16. However, the present invention is not limited to this. The tracking CGH may be formed so as to be separated by a predetermined interval. FIG. 10 is a plan view showing a transfer foil used when manufacturing such an optical recording medium, FIG. 11 is a perspective view showing a hot stamp of an optical recording medium manufacturing apparatus used at that time, and FIG. 12 is a view showing a transfer foil after thermal transfer. It is an enlarged plan view shown. Here, as described above,
Tracking CGH 14A formed on optical recording medium 20
Is not a continuum as shown in FIG. 5, but data CGH1
As shown in FIG. 4B, the individual components are separated and arranged at predetermined intervals. Then, in order to absorb the displacement during the thermal transfer, the tracking CGHs 14A are continuously formed in the same pattern on the transfer foil 30 as shown in FIG.

In order for the tracking CGHs 14A to be individually separated and arranged at predetermined intervals, as shown in FIG. 11, a tracking heating block 34A arranged at the center of the hot stamp 32 is used. Are divided into a plurality of small, substantially rectangular blocks and arranged at predetermined intervals, similarly to the data heating blocks 34B arranged on both sides thereof. FIG. 12 shows the transfer foil 30 after thermal transfer using the hot stamp 32. Similar to FIG. 4, a white square portion in FIG. 12 indicates a portion removed by thermal transfer. In this case, not only the positional deviation in the direction orthogonal to the arrangement direction of the tracking CGHs 14A, but also the positional deviation in the arrangement direction of the tracking CGHs 14A can be absorbed. It should be noted that the arrangement of the tracking CGH in each of the above embodiments is merely an example, and it is a matter of course that the arrangement is not limited thereto.

[0022]

As described above, according to the method for manufacturing an optical recording medium, the optical recording medium and the apparatus for manufacturing the same according to the present invention,
The following excellent functions and effects can be exhibited. Even if the transfer foil is displaced from the optical recording medium (recording medium base), the computer generated hologram (CGH) can be formed at an accurate position. Further, since information as a computer hologram group can be simultaneously formed on a computer hologram group selected from a plurality of computer hologram groups, unnecessary computer holograms need not be erased later, and the manufacturing process can be simplified. If the information of the computer hologram group is to be tampered with, it is necessary to add a computer hologram of a portion that has not been transferred. Since it is impossible to add the computer hologram, it is an effective countermeasure against forgery.

[Brief description of the drawings]

FIG. 1 is a plan view showing a transfer foil used for carrying out the present invention.

FIG. 2 is an enlarged sectional view of the transfer foil shown in FIG.

FIG. 3 is a perspective view showing a hot stamp of the optical recording medium manufacturing apparatus according to the present invention.

FIG. 4 is an enlarged plan view showing a transfer foil after thermal transfer.

FIG. 5 is a plan view showing an optical recording medium of the present invention.

FIG. 6 is a perspective view showing a hot stamp having a retractable heating block.

7 is a plan view showing an optical recording medium manufactured using the hot stamp shown in FIG.

FIG. 8 is a plan view showing a transfer foil after using the hot stamp shown in FIG. 6;

FIG. 9 is a schematic configuration diagram showing an optical recording medium manufacturing apparatus when a thermal head is used instead of a hot stamp.

FIG. 10 is a plan view showing another example of a transfer foil used when manufacturing a recording medium.

11 is a perspective view showing a hot stamp of the optical recording medium manufacturing apparatus used for the transfer foil shown in FIG.

FIG. 12 is an enlarged plan view showing a transfer foil after thermal transfer.

FIG. 13 is a plan view showing a conventional transfer foil.

FIG. 14 is an enlarged sectional view of the transfer foil shown in FIG.

FIG. 15 is a schematic configuration diagram showing a conventional optical recording medium manufacturing apparatus for transferring a hologram from a transfer foil.

FIG. 16 is an enlarged view showing a peeled state of a support when transferring is performed using a conventional transfer foil.

FIG. 17 is a plan view showing a conventional optical recording medium.

[Explanation of symbols]

4 base film (support), 6 release layer, 8 hologram layer, 10 reflection layer, 12 adhesive layer, 14 computer hologram (CGH), 14A tracking CGH,
14B: data CGH, 16: recording medium base, 20:
Optical recording medium, 30: transfer foil, 32: hot stamp, 3
4 heating block, 34A tracking heating block, 34B data heating block, 40 heating chip (heating block), 42 thermal head.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G11B 7/0065 G11B 7/24 572M 5D121 7/24 572 572L 7/26 531 7/26 531 G06K 19/00 RF term (Ref.)

Claims (5)

[Claims] A hologram layer partially including a hologram formation region, a protective layer made of a resin having a different refractive index from the hologram layer or a metal reflective layer, and an adhesive layer are formed on a support. A method for manufacturing an optical recording medium, wherein only a portion corresponding to the hologram forming region is transferred from at least a transfer foil. 2. The hologram layer has a plurality of hologram formation areas in which a plurality of different types of information are recorded, and transfers only a portion of the plurality of hologram formation areas corresponding to a selected hologram formation area. 2. The method for manufacturing an optical recording medium according to claim 1, wherein the method is performed. 3. A separation layer, a hologram layer partially including a hologram formation region, a protective layer made of a resin having a different refractive index from the hologram layer or a metal reflection layer, and an adhesive layer are formed on a support. An optical recording medium, wherein only a portion corresponding to the hologram forming area is transferred from at least a transfer foil. 4. A separation layer, a hologram layer partially including a hologram formation region, a protective layer made of a resin having a different refractive index from the hologram layer or a metal reflection layer, and an adhesive layer are formed on a support. In an apparatus for manufacturing an optical recording medium for transferring a desired portion to a recording medium base from at least a transfer foil, an optical recording medium having a plurality of heating blocks for transferring only a portion corresponding to the hologram forming region of the transfer foil. manufacturing device. 5. The apparatus according to claim 4, wherein the plurality of heating blocks have a structure capable of selectively controlling transfer or non-transfer.