JPH02177140A - Optical card - Google Patents

Abstract

PURPOSE:To protect a metal thin film layer from flaws in the production process by sticking a resin substrate with a metal thin film layer formed on one side of a transparent resin substrate and forming patterns of photosensitive material according to digital informations on the other side of the transparent resin substrate to avoid direct exposure of the metal thin film to environment. CONSTITUTION:The optical card material 8 is produced by forming the metal thin film layer 5 having high reflectance on the transparent resin substrate 4 and sticking it to the resin substrate 6. The optical recording part 10 formed thereon consists of a photosensitive material showing a color of low reflectance such as black and has patterns 9 according to digital informations. By this constitution, the transparent resin substrate 4 acts as a protective layer to protect the metal thin film layer 5 from flaws in the process of forming patterns according to the digital informations and from deterioration due to oxidation.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a read-only optical card.

<Prior Art> Optical recording has advantages over magnetic recording in that there is no contact between the recording medium and the henode, and high-density recording is possible.

As this optical recording medium, there are known read-only types, additionally writable types, and erasable/rewritable types, and tape-like, disk-like, and card-like shapes have been proposed as optical recording media.

Among them, card-shaped recording media do not take up much storage space.
It has many advantages compared to other shapes, such as being easy to carry, requiring no special packaging for mailing, and being able to use regular envelopes. In addition, read-only optical cards have these advantages as well as the ability to reproduce large f1 copies of the same information, so their application as information recording media for games, software, electronic publishing, parts lists, etc. is being actively considered. There is.

This read-only information II
ory, ROM) type optical card [Japanese Patent Application Laid-Open No. 60-6634
Publication No. 6 J Publication No. 1980-80631 J Proposal As shown, an optical card having an optical recording portion formed by etching an optical reflective surface made of a metal thin film layer is known. As shown in FIG. 5, the optical card includes a batten-forming metal thin IIW layer (]), a card base material (2) including a low reflectance layer adjacent to the batten-forming metal thin film layer (1), and a protective layer (3). ) (Problem to be Solved by the Invention) However, such optical cards do not require the formation of a metal thin film layer on a base material in advance, and then applying fine shading bumps corresponding to digital information to the metal thin film layer. In order to form a photosensitive material, the photosensitive material is coated, exposed, and developed using a photolithography method, and then a metal thin film layer is formed using a photoetching process. Because there are many and complex problems,
It has been difficult to reduce manufacturing costs.

Furthermore, since the pattern to be etched is minute, even slight changes in etching conditions affect the pattern shape of the optical reflective surface, making it difficult to record stable and accurate information.

Furthermore, since the metal thin film layer is exposed to the outside during pattern formation, there is a high possibility that scratches will occur in the metal thin film layer, and sufficient care must be taken in handling.

Therefore, the present invention was made to solve the above problems, and it eliminates the need for photoetching and processing of metal thin film layers, has excellent productivity, and provides accurate pattern formation and structure compatible with digital information. The purpose is to provide optical cards that are stable in terms of performance.

Means for Solving the Problems> The present invention, which has been made to achieve the above-mentioned objects, is an optical card having an optical recording section for recording digital information, in which a gold B thin film layer is formed on a transparent resin base layer, and the gold B thin film layer is formed on a transparent resin substrate. An optical card in which a metal thin film layer and a separately prepared resin base material are laminated together as an optical card base material, and an optical recording portion is formed with a pattern made of a photosensitive material on the transparent resin base layer of the optical card base material. be.

<Function> As mentioned above, a metal thin film layer as a reflective layer is formed on one side of a transparent resin base material, and is further bonded to the resin base material, and a photosensitive material is used on the opposite side of the transparent resin base material to support digital information. By forming the pattern, the metal thin film layer is not directly exposed to the outside when forming the batten, thereby preventing scratches and the like during the manufacturing process, improving productivity and making it possible to record accurate information.

<Example> The present invention will be described in detail below based on an example of the drawings. FIG. 1 is a partially enlarged sectional view of the optical card of the present invention,
A metal thin film layer (5) having optically high reflectance is formed on the surface of the transparent resin base material (4) and is bonded to the resin base material (6) on the optical card base material (8). The optical recording section 0ω is made of a photosensitive material having a color exhibiting an optically low reflectance, and has a pattern (9) corresponding to digital information formed thereon.

The manufacturing process of the optical card of the present invention will be explained using FIGS. 1 to 4. FIG. 2 shows a metal thin film layer (5) having a high optical reflectance on a transparent resin base material (4). It was formed.

The above-mentioned transparent resin base material (4) is preferably one that has excellent portability, suitability for mailing, etc. depending on the use as an optical card, and has rigidity and processability. Specific examples include polycarbonate resin, acrylic resin, and polyester resin.・Transparent seals such as polyvinyl chloride resin are used.

As the metal thin film layer (5), a metal material having optically high reflectance such as Al4 or Cr can be used, and general methods such as vacuum evaporation or spanking can be used to form the metal thin film layer (5). A layer having a thickness sufficient to obtain sufficient reflectance may be formed on the transparent resin base material (4) by a method known in the art, and the metal Wi film layer (5) may be formed by laminating metal foil. You may do so.

Figure 3 shows that after forming a metal thin film layer (5) on one side of a transparent resin base material (4), a separately prepared resin base material (6) is formed.
) are pasted together at the pasting part (7).
).

The resin base material (6) may be the same as the transparent resin base material (4), and if necessary, an opaque resin base material made of the same material as the transparent resin base material (4) or paper may also be used.

The metal thin film layer (5) formed on the transparent resin base material (4) and the resin base material (6) can be bonded together using heat fusion or an adhesive. Examples of the adhesive include acrylic, for example. system,
A room temperature or thermosetting type such as an epoxy type can be used.

The thickness of the resin base material (6) is not particularly limited, and a desired thickness can be used depending on the purpose of the card, but the transparent resin base material (4) has a metal thin film layer (5) as shown in FIG. ) and the batten (9) formed of a photosensitive material, the thinnest one possible is used to prevent a decrease in the contrast of the batten due to light diffraction phenomenon when reading with an optical card reader. is preferred.

Figure 1 shows that a button (9) made of a photosensitive material compatible with digital information is formed by photolithography on the transparent resin base material (4) of the optical card base material (8) obtained in Figure 3. By forming this into a predetermined card shape, an optical card can be obtained.

To form a batten made of a photosensitive material compatible with digital information using a photolithography method, a spin code method, roll coating method, or spray coating method is applied to the transparent resin base material (4) of the optical card base material (8). A liquid photosensitive material is applied using a known coating method such as, and exposed and developed through a photomask having a density button corresponding to digital information, thereby forming a button (9) made of the photosensitive material. It is possible to do so.

As a liquid photosensitive material, the color of the formed baton (9) has a large optical reflection contrast difference with respect to the metal film layer (5) having high reflectance, or the color of the formed batan (9) has a large optical reflection contrast difference with respect to the metal film layer (5) having high reflectance, or There are no particular limitations as long as it has excellent properties, such as those made by dispersing and mixing dichromate and carbon black in polyvinyl alcohol, and commercially available photosensitive materials made by adding stilbazolium groups as photosensitive groups to polyvinyl alcohol (for example, commercially available photosensitive materials). Known photosensitive materials can be used, such as SPP (manufactured by Toyo Gosei Co., Ltd.) with carbon black dispersed and mixed therein, diazonium photosensitive materials using diazonium salts, and silver salt photosensitive materials made with gelatin dispersed and mixed with halogen silver. It is.

Further, if the color of the formed batten (9) has a large optical reflection contrast difference with respect to the metal thin film layer (5) having a high reflectance, or has a fin with optical light blocking properties,
After a sheet-like solid photosensitive material typified by Transfer Key (trade name, manufactured by 3M Company) is brought into close contact with the transparent substrate (4), a batten (9) may be formed by exposure and development.

Further, even if the photosensitive material forming the batten (9) is transparent, it can be used as long as it can be colored by dyeing or the like during development or after battening.

FIG. 4 shows the transparent protection of the button (9) formed of the photosensitive material of the optical recording section 00 obtained in FIG. layer θ
1).

Effect> As described above, according to the present invention, there is provided an optical card having an optical recording section consisting of a light and shade button corresponding to digital information, and a resin is provided on the metal thin film layer forming surface of a transparent resin base material as an optical card base material. When forming a light and shade pattern on a metal thin film by bonding base materials together, the transparent resin base material serves as a protective layer to prevent surface scratches such as scratches on the metal thin film layer during the process of forming a light and shade pattern compatible with digital information. Prevented.

In addition, since the optical card base material with the above structure is not directly exposed to the atmosphere, there is no material deterioration due to oxidation of the metal thin film layer, and furthermore, the occurrence of scratches during storage is prevented, so it is not exposed to light. Cards can be stored for a long time, and when manufacturing optical cards, optical card base materials without shading tabs are manufactured and stored in advance, and if necessary, 'a shading tabs can be formed to correspond to digital information. By forcing
Efficient production of optical cards is possible.

In addition, since the button is made of photosensitive material using photolithography and corresponds to digital information, it is simpler and cheaper to produce in mass quantities than the conventional method of etching a metal thin film to record digital information. It is possible to obtain an optical card that can be easily mass-produced in time, has a good contrast ratio corresponding to the obtained digital information, and can record accurate information.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged sectional view of the optical card of the present invention. 2 to 4 are partially enlarged sectional views of an optical card in the manufacturing process of the optical card of the present invention, and FIG. 5 is a partially enlarged sectional view of a conventional optical card. 1. Card base material including a batten-forming metal thin film layer 2 and a low reflectance layer 3. Protective layer 4. Transparent resin base material 56 metal thin film layer 6. Resin base material 7, bonding part 8. Optical card base material 9, baton 10. Optical recording section 11, i3 bright protective layer patent application Toppan Printing Co., Ltd. Representative Suzu Figure 1 Section 2. Third C. Figure 4 District 5

Claims (1)

[Claims] (1) In an optical card having an optical recording section for recording digital information, a metal thin film is formed on a transparent resin base material, and the metal thin film layer and a separately prepared resin base material are bonded together to form an optical card base material, An optical card characterized in that an optical recording portion is formed on a transparent resin base material of the optical card base material using a pattern made of a photosensitive material corresponding to digital information.