JPH0727181Y2 - Optical recording card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a certification card, in particular, an optical recording card with hologram.

In recent years, cards that store various types of information, such as ID cards, cash cards, and bank cards, have become widespread.

[Prior Art] It is necessary to record various information such as personal data and data of the issuing company on this kind of card, and at the initial stage, such information is recorded with visible characters or symbols. Also, in the latter stage, it is recorded by an electric signal using magnetism, but it is necessary to cope with the prevention of forgery and falsification and the increase in the amount of information.

Therefore, recently, an optical recording card to which an optical recording technology is applied has been developed. This optical recording card comprises an information recording medium having an optical reflection surface.

Such a card is called an optical recording card. A typical structure of such an optical recording card is one in which a plastic card front substrate and a card back substrate are bonded together, and an optical recording layer is sandwiched therebetween. The optical recording layer is equipped with a light-reflecting layer having an optical-reflecting surface.Data pits are formed on the optical-reflecting surface, and a laser beam is emitted to detect the data pits by the difference in reflectance and read the data. It was done.

On the other hand, it is considered to use a hologram for a certification card (see, for example, Japanese Patent Application Publication No. 6782 in 1986 and Japanese Patent Application Publication No. 176969 in 1986). A hologram is one in which the amplitude and phase information of the light wave from an object is recorded at the same time, and by applying reproduction illumination light to the hologram, the light wave itself whose amplitude and phase are equivalent to those of the light from the original object. Can be reproduced and a stereoscopic image can be reproduced. Therefore, by applying this to a certification card, the appearance of the card can be improved and the information that can be contained in the card can be densified. It is expected to make counterfeiting and falsification difficult. In particular, this hologram is easy to use because a technique for manufacturing a transparent substrate by a stamping method has been developed and mass production has become possible.

Therefore, if both the optical recording unit and the hologram are provided on the certification card, it is possible to further increase the density of information that can be included in the card and further improve the difficulty of counterfeiting or falsification of the card.

[Problems to be solved by the invention] However, by separately preparing the optical recording member and the hologram,
If this is attached to the card base material, the structure of the card becomes complicated, and the number of constituent members and man-hours increase simply and additively, which may increase the price of the card.

Therefore, the present applicant previously proposed an optical recording card with a hologram in which a hologram portion and an optical recording portion are formed in an overlapping manner (Japanese Patent Application No. 61-244995). However, in the newly proposed one, the optical recording pattern is formed on the hologram pattern, and the metal reflection film is formed so as to cover the optical recording pattern. In the above, there is a possibility that distortion will occur in the hologram due to insufficient adhesion between the unevenness of the hologram interference fringe and the metal reflection film, and improvement of this point is desired.

The present invention has been made in view of the above circumstances, and has both an optical recording unit and a hologram to enable high-density recording, improve the difficulty of forgery and falsification, and improve the appearance. It is a certification card, and its structure is simple, the number of constituent members and man-hours can be reduced, and it is inexpensive. Moreover, the unevenness of the interference fringes and the metal reflection film are well adhered to each other in the entire area of the hologram portion, and a good image is obtained. The purpose is to provide a certification card that can obtain

[Means for Solving the Problems] In order to achieve this object, the optical recording card of the present invention has an information recording portion forming area between a card front substrate and a card back substrate, and the information recording portion forming region is formed. At least a part of the optical recording pattern layer and the hologram are overlapped with each other in the area, and the optical recording pattern layer is made of a material that absorbs invisible light and is transparent to visible light. A pattern is formed in advance, and the hologram is a reflection type hologram in which a metal reflection film is in close contact with an uneven pattern of interference fringes.

[Operation] In the hologram-formed optical recording card configured in this manner, when the reproduction illumination light that is visible light is illuminated from the surface of the front substrate to the information recording portion forming region, it is diffracted in several directions by unevenness, Among these diffracted lights, there is a light wave having the same amplitude phase as the wavefront of the previously recorded light, which reproduces the recorded image. At this time, since the optical recording pattern layer is formed using a material transparent to visible light, it does not hinder the reproduction of the image from the hologram. At this time, the optical recording pattern layer is not visible. Next, the reading light of infrared rays or ultraviolet rays is incident on the optical recording pattern layer from the surface of the front substrate,
If the reflected light is taken, the contents recorded on the optical recording pattern layer can be read.

[Embodiment] Hereinafter, the details of these devices will be described with reference to the drawings illustrating an embodiment.

In FIGS. 1 and 2, 1 is an optical recording card,
The optical recording card 1 has an information recording portion forming area 9 between two card base materials, that is, a front base material 2 and a back base material 3,
The hologram pattern 4 is formed in the information recording portion forming area 9.
And the optical recording pattern layer 11b are arranged at least partially overlapping each other in the direction of the incident path of the reading light.
The front substrate 2 is made of a highly transparent resin such as polycarbonate and polymethylmethacrylate (PMMA) epoxy,
The back substrate 3 is made of a resin material such as vinyl chloride, polycarbonate, polyethylene terephthalate, polymethylmethacrylate, or epoxy.

The optical recording pattern layer 11b has a thickness of about 0.1 to 2.0 μm, is formed of a material that absorbs invisible light such as infrared rays or ultraviolet rays and is transparent to visible light. Therefore, this optical recording pattern layer 11b cannot be visually recognized by the illumination of visible light under normal conditions, but in a reader using infrared rays or ultraviolet rays as the reading light, the optical information contained in the optical information pits formed therein is recorded. Can be read.

A paint or ink prepared by dissolving an infrared absorber or an ultraviolet absorber in a binder of 0.01% to 20% is used as a material forming the optical recording pattern layer 11b.

Examples of such infrared absorbers include PA-1005 (manufactured by Mitsui Toatsu), PA-1004 (manufactured by Mitsui Toatsu), NK-2014 (manufactured by Japan Photosensitive Dye Research Institute), NK-2865 (Nihon Senshi Dye Research Institute), IR-820 (Nippon Kayaku), IRG-002 (Nippon Kayaku), IRG-003 (Nippon Kayaku), CY-20 (Nippon Kayaku), etc. Can be used.

As such an ultraviolet absorber, for example, Tinuvin (manufactured by CIBA-GEIGY, trade name) Uvinul (trade name manufactured by CIBA-GEIGY) Cyascrb (trade name manufactured by Am.Cyanamid) can be used.

As such a binder, for example, FVR (transparent photosensitive resin, manufactured by Fuji Yakuhin Co., Ltd.), Semicofine SP-910 (transparent thermosetting resin, manufactured by Toray Co., Ltd.), etc. No binder can be used.

A thermoplastic resin is also effective as the non-photosensitive binder. For example, resins such as vinyl chloride, acryl, styrene, polyester, polyvinyl alcohol cellulose, vinyl acetate, and vinyl chloride-vinyl acetate copolymer can be used.

As the patterning method, a photolithography method (in the case of a photosensitive binder), a photoetching method (in the case of a non-photosensitive binder), a printing method or the like can be used.

A hologram pattern 4 representing interference fringes of a hologram is formed over at least a part of the optical recording pattern layer 11b and over the entire surface of the information recording portion forming area 9. Further, on the hologram pattern 4, Al, Au, Ag, Cu, Cr, Ni, Te, B
It is covered with a metal reflection film 11a such as i. Metal reflective film 11
The surface of a is covered with the back substrate 3 with the adhesive 15 in between. Hologram pattern 4 on front substrate 2 and metal reflection film 11
A reflective hologram is constructed in cooperation with a. Therefore,
The reflection hologram in the information recording portion forming area 9 is composed of the hologram pattern 4 on the front substrate 2 and the metal reflection film 11a, and the optical recording pattern layer 11b is positioned overlapping the hologram pattern 4.

In the hologram-equipped optical recording card 1 configured as described above, the hologram pattern 4 can be obtained by illuminating the information recording portion forming area 9 from the surface of the front substrate 2 with reproduction illumination light which is visible light.
Are diffracted in several directions, and in those diffracted lights,
There is a light wave with the same amplitude and phase as the wavefront of the previously recorded light, which reproduces the recorded image. At this time, since the optical recording pattern layer 11b is transparent to visible light, it does not hinder the reproduction of the image from the hologram and cannot be visually observed. Next, by reading infrared or ultraviolet reading light from the surface of the front substrate 2 into the optical recording pattern layer 11b and taking the reflected light, the contents recorded in the optical recording pattern layer 11b can be read.

In the hologram-equipped optical recording card 1 thus configured, the hologram 4 pattern and the optical recording pattern layer 11b are provided.
The information that can be included in the hologram-equipped optical recording card 1 can be densified because of overlapping. Further, in order to forge or falsify the optical recording card with hologram 1, both the hologram pattern 4 and the optical recording pattern layer 11b must be processed, but the optical recording pattern layer 11b is invisible. If processing is added to the result, the other will be destroyed, and it will be difficult to modify these, and it is possible to prevent counterfeiting and falsification of the card. Further, in particular, even in the portion where the optical recording pattern layer 11b is formed, since the hologram pattern 4 is formed in the subsequent step of the optical recording pattern layer 11b, the hologram pattern 4 of the hologram interference fringes and the metal reflection film 11a are in close contact with each other. It is possible to obtain a holographic reproduction image.

Next, a method for manufacturing the above optical recording card with hologram 1a will be described with reference to FIG.

First, as shown in FIG. 3, a transparent front base material 2 of polycarbonate having a thickness of 0.40 mm is prepared (FIG. 3 (a)).

Next, Infrared absorbing dye CY-20 from Nippon Kayaku Co., Ltd. 1 part Toyo Ink Mfg. Co., Ltd. Screen Process Ink Medium S8-800 20 parts Toyo Ink Mfg. Co., Ltd. Screen Process Ink thinner S7-718 5 parts A desired optical recording pattern layer 11b having a dry film thickness of about 2 μm is formed on the information recording portion forming region 9 by sill screen printing on the front substrate 2 with the mixed ink (FIG. 3 (b)).

Next, the mold having the hologram pattern 4 formed thereon is applied to the information recording portion forming region 9 of the front substrate 2 from above the optical recording pattern layer 11b, and heated at 210 ° C., 20 kg / cm ² for 1 minute. Pressing is performed to form the hologram pattern 4 (FIG. 3 (c)).

Next, a metal reflection film 11a is formed on the information recording portion forming region 9 of the front substrate 2 by vacuum evaporation so that the film thickness is about 1000Å at a vacuum degree of 2 × 10 ^-5 Torr and an evaporation rate of 20Å / sec. It is formed (FIG. 3 (d)).

Next, a urethane-based thermoplastic adhesive 15 is preliminarily coated on the back substrate 3 of a vinyl chloride sheet having a desired design with a thickness of 0.35 mm by a roll coating method so that a dry film thickness is 5 μm on the inner surface side. Then, the inner surfaces of the front substrate 2 and the back substrate 3 are overlapped with each other, and hot pressed at 90 ° C. and 15 kg / cm ² for 10 minutes to bond them (FIG. 3 (e)).

Then, the optical recording card 1a is cut into a normal card shape to obtain an optical recording card 1a (FIG. 3 (f)).

FIG. 4 shows a method of manufacturing an optical recording card 1b in which an optical recording pattern layer is formed by etching, in which the hologram pattern 4 is formed on the front substrate 2 by the photopolymer method.

First, as shown in FIG. 4, a polycarbonate transparent front substrate 2 having a thickness of 0.40 mm is prepared (FIG. 4 (a)).

Next, Tokyo Ohka Kogyo's water-soluble photosensitive material G-90 100 parts Ammonium dichromate 10% solution 1 part Near-infrared absorption dye NK-125 1 part ethanol 50 parts of Japan Photosensitive Dye Research Institute are mixed and stirred. Is applied to the front substrate 2 by a roll coating method and dried at 70 ° C. for 4 minutes to give a dry film thickness of 1 μm.
Forming a thin film 21 (FIG. 4 (b)).

Next, the mask 30 having the desired optical recording pattern 11b formed on the surface base material 2 is brought into close contact with the coating surface and exposed at 100 mJ / cm ² using a high pressure mercury lamp to form the optical recording pattern layer 11b. (Fig. 4 (c)).

Next, the surface recording material 2 having the optical recording pattern 11b formed thereon is developed with pure water at 40 ° C. for 1 minute, and then baked at 100 ° C. for 30 minutes. (FIG. 4 (d)).

Next, the ultraviolet curable acrylic resin 22 of the front substrate 2 is
It is coated with a spinner to a thickness of 10 μm (Fig. 4 (e)), a mold having a hologram pattern 4 formed on the coating surface is applied, and 100 m is applied from the front substrate 2 side using a high pressure mercury lamp.
Irradiation with W / cm ² for 30 seconds forms a hologram pattern 4 (FIG. 4 (f)).

Next, the metal reflection film 11a is vacuum-deposited on the hologram pattern 4 of the front substrate 2 to form a vacuum degree of 2 × 10 ⁻⁵ Torr,
The vapor deposition rate is 20Å / sec to form a film thickness of about 1000Å (Fig. 4 (g)).

Next, a urethane-based thermoplastic adhesive 15 is preliminarily coated on the back substrate 3 of a vinyl chloride sheet having a desired design with a thickness of 0.35 mm by a roll coating method so that a dry film thickness is 5 μm on the inner surface side. Then, the inner surfaces of the front substrate 2 and the back substrate 3 are overlapped with each other, and heat pressed at 100 ° C. and 20 kg / cm ² for 10 minutes to bond them (FIG. 4 (h)).

Next, a normal card shape is cut to obtain an optical recording card 1b (FIG. 4 (i)).

FIG. 5 shows a method of manufacturing the optical recording card 1c, in which the optical recording pattern layer 11b is formed by etching.
The hologram pattern 4 is formed on the back substrate by the photopolymer method.

First, as shown in FIG. 7, a transparent back substrate 3 having a thickness of 0.35 mm and having a desired design is prepared (FIG. 5 (a)).

Next, the UV curable acrylic resin 22 is applied to the back substrate 3.
It is coated with a spinner to a thickness of 10 μm (FIG. 5 (b)), a mold having a hologram pattern 4 formed on the coated surface is applied, and a high pressure mercury lamp is used for 100 m from the back substrate 3 side.
Irradiation with W / cm ² for 30 seconds forms a hologram pattern 4 (FIG. 5 (c)).

Next, the metal reflection film 11a is vacuum-deposited on the hologram pattern 4 on the back substrate 3, and the degree of vacuum is 2 × 10 ⁻⁵ Torr.
The film is formed to a film thickness of about 500Å at a vapor deposition rate of 20Å / sec (Fig. 5 (d)).

Next, a negative photoresist OMR-83 of Tokyo Ohka Kogyo Co., Ltd. OMR-83 100 parts Near infrared absorption dye NK-2865 1 part of Japan Photosensitive Dye Research Institute 1 part Cyclohexane 50 parts are mixed and stirred, and the solution is mixed, and the metal reflective film on the backing substrate 3 It is applied onto 11a by a roll coating method and dried at 70 ° C. for 4 minutes to form a thin film 24 having a dry film thickness of 2 μm (FIG. 5 (e)).

Next, the mask 30 on which the desired optical recording pattern 11b is formed is brought into close contact with the coating surface of the back substrate 3, and exposed at 100 mJ / cm ² using a high pressure mercury lamp (FIG. 5 (f)).

Next, the back substrate 3 is developed with an OMR developer of Tokyo Ohka Kogyo Co., Ltd. and rinsed with an OMR rinse solution of Tokyo Ohka Kogyo Co., Ltd. to form an optical recording pattern layer 11b (FIG. 5 (g)). ).

Next, a UV-curable adhesive 16 was applied to a transparent front base material 2 made of polycarbonate having a thickness of 0.40 mm by a roll coating method so that the dry film thickness was 10 μm, and dried and the back substrate. The material 3 is brought into close contact with the hologram pattern surface and irradiated with 100 mW / cm ² for 40 seconds using a high pressure mercury lamp to adhere (FIG. 5 (h)).

Next, an optical recording card 1c is obtained by cutting into a normal card shape (FIG. 5 (i)).

Separately from this, as shown in FIG. 6, the information recording portion forming region 9 is formed on the PET film 8 having a thickness of 50 μm in the above steps (b) to (g), and the front substrate 2 and the back substrate are formed. It is also possible to make an optical recording card 1d by sandwiching the material 3 with adhesives 32 and 33 interposed therebetween.

[Advantages of the Invention] In the hologram-equipped optical recording card and the method for manufacturing the same configured as described above, since both the hologram and the optical recording unit are provided, it is possible to increase the density of information that can be included in the certification card. . In addition, in order to forge or falsify this certification card, both the hologram and the optical recording section must be processed, but if one is processed, the other will be affected, and it will not be possible to modify them. Since it is almost difficult, it is possible to prevent counterfeiting and falsification of cards.

For this reason, although the hologram is provided on the optical recording card, the structure is not complicated, the number of constituent members is not doubled, and the number of manufacturing steps is not simply increased. Moreover, it makes it difficult to forge and falsify cards.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of the hologram-equipped optical recording card 1, FIG. 2 is a plan explanatory view of the hologram-equipped optical recording card 1, and FIG.
FIG. 4 is a process explanatory view showing a method of manufacturing the hologram-mounted optical recording card 1a, FIG. 4 is a process explanatory view showing a method of manufacturing the hologram-mounted optical recording card 1b, and FIG. 5 is a manufacturing method of the hologram-mounted optical recording card 1c. 6A and 6B are cross-sectional explanatory views of the optical recording card with hologram 1d. 1 …… Optical recording card 1a …… Optical recording card 1b …… Optical recording card 1c …… Optical recording card 2 …… Front substrate 3 …… Back substrate 4 …… Hologram pattern 8 …… PET film 9 …… Information Recording area formation area 11a …… Metal reflective film 11b …… Optical recording pattern layer 13 …… Optical information pit 15 …… Adhesive 16 …… UV curable adhesive 21 …… Thin film 22 …… UV curable acrylic resin 24… … Thin film 30 …… Mask 32, 33 …… Adhesive

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 7/00 E 9464-5D 7/24 B 7215-5D 23/38 Z 7177-5D

Claims (3)

[Scope of utility model registration request] 1. An information recording portion forming region is provided between a card front substrate and a card back substrate, and an optical recording pattern layer and a hologram are provided at least partially overlapping each other in the information recording portion forming region. The optical recording pattern layer is formed of a material transparent to visible light that absorbs invisible light and has an optical recording pattern formed in advance, and the hologram is formed on the uneven pattern of interference fringes. Optical recording card characterized by being a reflection type hologram in which a metal reflection film is closely attached 2. An information recording portion forming region is provided between a card front substrate and a card back substrate, and an optical recording pattern layer and a hologram are at least partially overlapped in the information recording portion forming region. In the overlapped portion, the optical recording pattern layer and the metal reflection film are arranged adjacent to each other in order from the incident light of the reading light, and the optical recording pattern layer absorbs invisible light and absorbs visible light. The optical recording pattern is formed in advance by using a transparent material, and the hologram is formed by closely contacting the metal reflection film on the uneven pattern of interference fringes formed on the inner surface of the card surface base material. 2. An optical recording card according to claim 1, wherein the optical recording card is a reflection type hologram. 3. An information recording portion forming area is provided between a card front substrate and a card back substrate, and an optical recording pattern layer and a hologram are provided at least partially overlapping each other in the information recording portion forming area. In the overlapped portion, the optical recording pattern layer, the ultraviolet curable resin layer on which the concave and convex portions of the hologram are formed, and the metal reflection film are arranged adjacent to each other in order from the incident light of the reading light, and the optical recording pattern layer is An optical recording pattern is formed in advance by being made of a material that absorbs invisible light and is transparent to visible light, and the hologram is an uneven pattern of interference fringes formed on the surface of the ultraviolet curable resin layer. The optical recording card according to claim 1, wherein the optical recording card is a reflection type hologram in which the metal reflection film is in close contact with the reflection hologram.