JPS61210545A - Forgery-prevented card - Google Patents

Abstract

PURPOSE:To prevent easily forgery by adhering an optical recording part and protective layer or card base material at the adhesive power varied within the adhesive surface so that the optical recording part is ruptured at the bound ary between the different adhesive powers in the stage of stripping said part. CONSTITUTION:A primer treated part 5 is formed to part of the adhesive surfaces between the optical recording part 2 and the protective layer 3 and the primer treated part 5 is formed to part of the adhesive surfaces between the optical recording part 2 and a card base material 4. The adhesive power between the 1st recording layer and the layer 3 is varied within the adhesive surfaces thereof in the case of constituting the recording part 2 of the 1st record ing layer consisting of a light transmitting part and light shielding part and the 2nd recording layer consisting of a thin reflective metallic film layer. The recording part 2 is then ruptured at the boundary between the different adhesive powers when the optical card 1 is stripped at every constituting part. The forgery of the card 1 is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical card having an optical recording section, and more particularly to an optical card that can prevent counterfeiting of the optical recording section.

[Prior art and its problems]

Optical cards that have an optical recording section on which information is optically recorded and reproduced have a
Information can be recorded and reproduced with high density, and the recording dimensions of the optical recording section are minute, such as 1.5 to 50 μm, so it is not easy to copy and counterfeit the optical recording section itself. have. Therefore, optical cards are being widely used in place of magnetic cards or in combination with magnetic cards for various cards such as credit cards, bank cards, cash cards, and 10 cards.

However, optical cards are usually mainly composed of a card base material, an optical recording section, and a protective layer thereof, and each part has illumination.
It is manufactured by bonding and laminating it with the same material (for example, Japanese Patent Application No. 57-49716). In addition, an optical recording part was prepared by a photographic reproduction method, and read-only information (Re
ad Only Memory), a manufacturing method in which writing guides and address numbers are recorded in advance (e.g., Japanese Patent Application No. 55-91586, Japanese Patent Application No. 59-7158).
No. 2, Japanese Patent Application No. 59-71583), an optical card is mainly composed of a card base material, an optical recording section, and its protective layer, and these are manufactured by bonding them together.

Therefore, even if it is difficult to copy or forge the optical recording part itself, it is relatively easy to peel off each constituent part of the card at the joint and modify and rejoin the optical recording part during card distribution. Another problem with conventional optical cards is that they can be counterfeited or misused.

This invention was made to solve the above-mentioned problems, and its purpose is to provide an optical card that cannot be easily counterfeited.

[Means for solving problems]

The optical card of the present invention has an optical recording section and an insulating II layer laminated on a card base material, and includes a protective layer that clamps the optical recording section and/or an adhesive between the card base material and the optical recording section. It is characterized in that the force is different within the adhesive surface.

The optical recording section in this invention is an area where information is optically recorded and reproduced, and more specifically, an area where information is written and read based on differences in light transmittance and/or differences in light reflectance. .

In this invention, the optical card is formed such that the adhesive force between the optical recording part and the protective layer or the adhesive force between the optical recording part and the card base material is different within each adhesive surface. . There are various ways to make this difference. For example, a method of applying a primer treatment to a part of the surface of the optical recording part or card base material to strengthen the adhesive force partially, and conversely, There are methods of partially weakening the adhesive force by subjecting the surface to peeling treatment, and methods of partially changing the bonding adhesive. Processing methods for these include ordinary coating methods, plasma processing, thin film processing such as PVD, and CVD.

For example, in the optical card 1 shown in FIG. 1 and FIG. A brimer-treated portion 5 is formed on a part of the bonding surface with the material 4.

In the case where the adhesive strength is varied in the present invention, it is preferable that the boundary where the adhesive strength changes is overlapped with a random pattern such as a background pattern that is difficult to reproduce. This is expected to provide a high counterfeit prevention effect.

Furthermore, when the optical recording section is composed of a first recording layer consisting of a light transmitting section and a light blocking section and a second recording layer consisting of a reflective metal thin film layer, the adhesive force between at least the first recording layer and the protective layer It is desirable to carry out the method differently within its adhesive surface.

[Action and effect of the invention]

In the optical card of the present invention, since the adhesive strength is different within the adhesive surface of the optical recording part, when an attempt is made to peel off each constituent part of the card, the optical recording part breaks at the boundary where the adhesive strength is different. Therefore, the recording dimension of the optical recording section is 1.5
The optical recording section itself can be replicated and
The combination of the fact that it is not easy to forge and the effects of the present invention makes it possible to almost completely prevent forgery of optical cards.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to an embodiment of the optical card of the present invention and the drawings.

As shown in FIG. 2, the optical card 1 of this embodiment is mainly composed of a protective layer 3, an optical recording section 2, and a card base material 4.
They are joined and integrated.

In this embodiment, the optical recording section 2 consists of a first recording layer 2a and a second recording layer 2b adjacent thereto.

The first recording layer 2a is provided on the lower surface of the protective layer 3, and the second
The recording layer 2b is bonded to the four surfaces of the card base material via the adhesive layer 7.

The card base material 4 in this example has an opaque base material layer 4a.
and a transparent base material layer 4b.

In some cases, the lower surface of the card base material 4 or the protective layer 3
A magnetic recording body may be provided on the upper surface of the . In addition, the optical recording section 2
may be provided on the entire card surface or one surface thereof. Furthermore, we can store IC memory, photos, and engraving images as necessary.
Characters, marks, raised characters called imprints, etc. may also be provided on the surface of the optical card. By doing so, one card can support various playback methods.

In the embodiment, a surface hardening layer 6 is provided on the outer surface of the protective layer, and furthermore, according to the invention, a surface hardening layer 6 is provided on a part of the joint surface between the first recording layer 1i2a and the protective layer 3, and also on a part of the joint surface of the second recording layer. is treated with brimer treatment.

The constituent members of the optical card of this embodiment will be explained in detail below.

Card base material As the card base material 4, any material that can be used as a base material for a normal card can be used. Specifically, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer, polyvinylidene chloride, acrylic polymers such as polymethyl methacrylate, polystyrene, polyvinyl butyral, acetylcellulose, styrene/butadiene copolymer, polyethylene, Polypropylene, polycarbonate, etc. are used. In some cases, iron, stainless steel,
Metal sheets of aluminum, tin, copper, zinc, etc., synthetic paper, paper, etc. may also be used. Furthermore, a laminate of the materials mentioned above may also be used. Among these, white hard polyvinyl chloride is preferable as the opaque material layer 4a, and transparent hard polyvinyl chloride is preferable as the transparent material layer 4b.

Protective layer The protective layer 3 can be made of any type of material that is transparent, such as glass, ceramic, paper, plastic film, woven fabric, or nonwoven fabric. However, from the viewpoint of productivity and smoothness, glass or plastic film is preferable. preferable. Plastics include cellulose derivatives, polyester resins, polycarbonate resins, vinyl resins, polyimide resins, acrylic resins, polyether resins,
Polysulfone resin, polyamide resin, polymethylpentene resin, triacetate, etc. can be used, and from the viewpoint of transparency and smoothness, cellulose triacetate,
Particularly preferred are polyethylene terephthalate, polycarbonate, acrylic, polyvinyl chloride, polysulfone, polymethylpentene, and the like. According to the present invention, this protective layer 3 may be partially pretreated to improve adhesion, such as corona discharge treatment, plasma treatment, and brimer treatment.

First Recording Layer The first recording layer 2a is composed of a light transmitting part and a light shielding part. The first recording layer 2a is formed, for example, by exposing a photosensitive material in a pattern such that unexposed areas are light-transmissive and exposed areas are light-blocking, and then developed. In some cases, the first recording layer 2a may be formed by exposing a photosensitive material in a pattern such that unexposed areas are light-shielding and exposed areas are light-transmitting, followed by development.

The photosensitive material is made of, for example, (a) a transparent resin as a binder, (b) a photodegradable development inhibitor having a diazo group or an azide group, and (c) a metal complex compound or metal compound that is reduced to become a metal development nucleus. It is configured. In this photosensitive material, the amount of a photodegradable development inhibitor having a diazo group or an azide group is 1 to 100 parts by weight, preferably 20 to 5 parts by weight, per 100 parts by weight of a transparent resin as a binder.
The metal complex compound or metal compound which is reduced to become metal development nuclei is present in an amount of 0.1 to 100 parts by weight, preferably 1 to 10 parts by weight. The development inhibitor, metal complex compound, or metal compound described above is dissolved or dispersed in the transparent resin as a binder, and is preferably dissolved.

As the transparent resin, either lipophilic or hydrophilic transparent resin can be used. Lipophilic transparent resins include polyvinyl acetate resin, vinyl acetate/acrylic acid ester copolymer resin, resin, resin having ester groups such as acrylic acid/vinyl acetate copolymer resin, ethylene/vinyl acetate copolymer resin, and cellulose acetate. Examples include resins having a hydroxyl group such as, modified vinyl acetate resins containing a carboxylic acid group or a sulfonic acid group, and the like.

Furthermore, in terms of optical recording properties, it is also effective to add cellulose derivatives such as nitrocellulose, which have the property of deforming in a heat mode, to these lipophilic transparent resins to increase sensitivity.

In addition, hydrophilic transparent resins include natural polymer compounds such as gelatin, casein, glue, gum arabic, and shellac, carboxymethyl cellulose, egg albumin,
Polyvinyl alcohol (partially saponified polyvinyl acetate),
Synthetic resins such as polyacrylic acid, polyacrylamide, polyvinylpyrrolidone, polyethylene oxide, and maleic anhydride copolymers are used, but other resins than the above can also be used as long as they are water-soluble or hydrophilic resins. The hydrophilic transparent resin used as a binder has such hydrophilicity that when a photosensitive material layer is formed using this transparent resin and brought into contact with a physical developer, the physical developer penetrates into the photosensitive material layer and physical development is possible. It is preferable that the

In addition, it is also effective to dissolve a low molecular weight substance such as nitrocellulose, which has a property of being easily deformed in a heat mode in terms of optical recording properties, in ethanol and add it to the above-mentioned hydrophilic transparent resin.

As the development inhibitor, a compound having a diazo group or an azide group is used. Examples of compounds having a diazo group include zinc chloride double salts or fluoroborate salts having a diazo group;
Alternatively, compounds which are synthesis products obtained from these compounds and paraformaldehyde are preferred. More specifically, I)-N.

N-diethylaminobenzeneazonium zinc chloride double salt, p-N-ethyl-N-β hydroxyethylaminobenzenediazonium zinc chloride double salt, 4-morpholino-2
, 6-jethoxybenzenediazonium zinc chloride double salt,
4-morpholino-2゜5-dibutoxybenzenediazonium zinc chloride double salt, 4-benzoylamino-2,5-
Jetoxybenzenediazonium zinc chloride double salt, 4-(
4'-methoxybenzoylamino)-2,5-jethoxybenzenediazonium zinc chloride double salt, 4-(p-tolylmercapto)-2,5-dimethoxybenzenediazonium zinc chloride double salt, 4-diazo-4'-methoxy In place of the zinc chloride double salt having a diazo group such as diphenylamine zinc chloride double salt, 4-diazo-3-methoxy-diphenylamine zinc chloride double salt, or the above zinc chloride double salt, the above borofluoride salt, sulfate, Phosphates can also be used.

Compounds having an azide group include p-azidoacetophenone, 4,4'-diazidechalcone, 2,6-bis-
(4'-azidobenzal)-acetone, 2,6-bis-
(4'-azidobenzal)-cyclohexanone, 2,6
-bis=(4'-azidobenzal)-4-methylcyclohexanone, 2,6-bis(4'-azidostyryl)-
Acetone, azidopyrene, etc. can be used. Compounds other than those mentioned above can also be used as long as they have a diazo group or an azide group, and two or more of the above-described compounds having a diazo group or an azide group can also be used in combination.

In addition, when using a compound having a diazo group, it is recommended to use a stabilizer that stabilizes this compound. Organic carboxylic acids and organic sulfonic acids can be used as this stabilizer, and more practically p - It is preferable to use toluenesulfonic acid or the like.

Next, the metal complex compound or metal compound which is reduced to become a metal nucleus will be explained.

First, as metal complex compounds that are reduced and become metal development nuclei, complex compounds of metals such as palladium, gold, silver, platinum, and copper are used, and as ligands that become electron donors for these metals, Commonly known materials can be used. Specifically, the following metal complex compounds are used.

Bis(ethylenediamine)palladium(I)ju, dichloroethylenediaminepalladium(I)13! , dichloro(ethylenediamine)platinum (Vl salt, tetrachlorodiamineplatinum(rV) salt, dichlorobis(ethylenediamine)platinum(rV) salt, Te1-raethylammonium copper(In2, bis(ethylenediaminecopper(n)F).

Furthermore, as a ligand for forming a metal complex compound, it is preferable to use a so-called chelating agent that forms a cyclic structure by coordinating at two or more sites because the stability of the metal complex compound formed is high. be. Examples of chelating agents include primary, secondary or tertiary amines, oximes, imines, and ketones; more specifically, dimethylglyoxime, dithion, oxine, acetylacetone, glycine, Compounds such as ethylenediaminetetraacetic acid, nitrilotriacetic acid, and uramyl diacetic acid are used.

Examples using the above chelating agent include bis(2,
2'-bipyridine)palladium(ff) salt, bis(acetylacetonato)palladium(n), bis(N,N
-diethylethylenediamine) copper(II) salt, bis(2
,2'-bipyridine) copper(II) salt, bis1.10-
phenanthroline) copper (IF) salt, bis(dimethylglyoximate) copper(II), bis(acetylacetonato)copper (■), bis(acetylacetonato)platinum(I)
I) etc. are preferred.

As the metal compound that is reduced and provides the bottom development nucleus, metal compounds such as water-soluble salts such as chlorides and nitrates of metals such as palladium, gold, silver, platinum, and copper are used. Salts such as palladium chloride, silver nitrate, and gold tetrachloride contained in the plating activator solution are preferred, and among these, palladium salts are particularly preferred.

As mentioned above, (a) transparent resin as a binder, (
b) A photodegradable development inhibitor having a diazo group or an azide group, and (c) a metal complex compound or metal compound which is reduced and becomes a metal development nucleus, and is mixed with a solvent selected according to the transparent resin used as the binder. The coating liquid for forming a photosensitive material layer has a viscosity of 10 to 1000 centivoise, which is suitable for coating. This coating solution for forming a photosensitive material layer is applied onto the Ill.
A photosensitive material layer is formed by applying a thick coating.

As a solvent for dissolving the transparent resin as a binder,
Various solvents can be used, but when using a hydrophilic transparent resin, water, a water-miscible solvent such as a lower alcohol, a ketone, or an ether, or a mixed solvent of water and a water-miscible solvent are used. In addition, when using a lipophilic transparent resin, lower alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol, ketones such as acetone and methyl ethyl ketone, esters such as ethyl acetate and Mn-butyl acetate, and methyl cellosolve may be used. A highly polar solvent is preferably used.

In addition, when using a hydrophilic transparent resin, it is desirable to perform hardening treatment after forming the photosensitive material layer in order to suppress elution of the binder and the like into the developer during physical development.

For example, the hardening treatment can be carried out by pre-mixing the following compound in a coating solution for forming a photosensitive material in an amount of 0.1 to 50 parts per 100 parts of the transparent resin, or by adding an aqueous solution of the following compound to the coating solution that has already been formed. This can be done by coating on the photosensitive material layer.

Aldehydes such as formaldehyde, glyoxal, glutaraldehyde, 2-methylglutaraldehyde, succinaldehyde; 0-benzoquinone, p- Benzoquinone, cyclohexane-1,2-dione, cyclopentane-1,2
- Diones, diacetyl, diketones such as 2,3-pentanedione, 2゜5-hexanedione, 2.5-hexanedione; epoxides such as triglycidyl isocyanurate; tetraphthaloyl chloride, 4,4'-diphenylmethanedis Acid anhydrides such as fluoronyl chloride; tannic acid, gallic acid, 2゜4-dichloroo-6-hydroxy-5-triazine, and the general formula R2NPOx2 R-N-C=N-R' (where R is C2-6 alkyl group, R' is (CH) N+ (CH3)3X- group, X is F or C
j, n are 1 or 2) phosphorus compound or carbodiimide; styrene/maleic acid copolymer, vinylpyrrolidone/maleic acid copolymer, vinyl methyl ether/maleic acid copolymer, ethyleneimine/maleic acid copolymer Resins such as methacrylic l/methacrylic nitrile copolymer, polymethacrylamide, methacrylic acid ester copolymer, glutaric acid, succinic acid, malic acid, lactic acid, citric acid, aspartic acid, gelcholic acid, tartaric acid Such.

In this way, the photosensitive material layer provided on the first layer 3 is exposed to light in a pattern, and then developed to form the first recording layer 2a, which is made up of a light-transmitting area that is an unexposed area and a light-blocking area that is an exposed area. Form. Pattern exposure can be performed, for example, through a mask such as a photomask.

It is also possible to form light shielding portions in a pattern by condensing the irradiation light into a beam and irradiating it directly onto the photosensitive material layer.

The image information provided by the light transmitting portions and the light shielding portions in the first recording layer 2a functions as tracking and preformat when reading the information itself or the information.

In the exposed area of the photosensitive material layer, the photodegradable development inhibitor having a diazo group or an azide group is decomposed according to the amount of exposure to form a latent image.

As the light source used for exposure, any light source that can decompose a compound having a diazo group or an azide group can be used, and an ultra-high pressure mercury lamp is usually preferably used.

A latent image formed by decomposition of a compound having a diazo group or an azide group by pattern exposure as described above,
Metal development nuclei are generated by contacting with an aqueous reducing agent solution. Note that in the unexposed area, the development inhibitor having a diazo group or an azide group is not decomposed, so even when it comes into contact with the reducing agent aqueous solution, no metal development nuclei are generated and it remains as a light-transmitting area.

The reducing agents used at this time include stannous chloride, Ti
Al1! Borane compounds such as stannous, sodium borohydride, dimethylamine borazane, diethylamine borazane, and trimethylamine borazane, borane compounds such as borane, diborane, and methyldiborane, hydrazine, and the like are used. Among these, acidic stannous chloride solution,
A stannous sulfate solution ('5eiSS solution) or a commercially available sensitizer solution for electroless plating is particularly preferred, but in general, any strong reducing agent can be used.

Next, when the metal development nuclei thus obtained are brought into contact with a physical developer, the metal contained in the physical developer is reduced and precipitated around the metal development nuclei, forming the light-shielding portion 4. be done.

As the physical developer, an aqueous solution containing a water-soluble reducible metal salt and a reducing agent is used at a low temperature or in a heated state if necessary.

As the reducible metal salt, water-soluble salts of VTB group metals such as nickel, cobalt, iron and chromium, and Ib group metals such as copper are used alone or in combination. It is also possible to obtain a tin or tin/copper metal layer by performing physical development with a salt solution and then performing displacement plating with stannous chloride or tin sulfate.

Among these, considering safety and preservation, nickel,
Copper and tin are preferred. However, unlike vapor deposition, small amounts of different metals and elements such as phosphorus and sulfur may be mixed in due to the purity of the raw materials, plating stabilizers, etc., but this does not particularly affect the properties as an optical recording material.

Specifically, the following are used as suitable water-soluble reducible metal salts.

Cobaltous chloride, cobaltous iodide, ferrous bromide,
Heavy metal halides such as ferrous chloride, nichrome bromide, nichrome iodide, cupric chloride; nickel sulfate, ferrous sulfate, cobaltous sulfate, ferrous sulfate, cupric sulfate, etc. Heavy metal sulfur! Heavy metal nitrates such as nickel nitrate, ferrous nitrate, cobaltous nitrate, dichromic nitrate, cupric nitrate: ferrus acetate, cobalt acetate
1~, metal chromic acid salts such as chromic acetate and Kubrick formate.

These reducible heavy metal salts are contained in a physical developer solution, for example, 10
It is preferably included in an amount of ~100 g/j.

Examples of reducing agents include hypophosphorous acid, sodium hypophosphite, sodium borohydride, hydrazine, formalin, diethylamine borane, dimethylamine borane,
Trimethylamine borane, borane, diborane, methyldiborane, diborazane, borazane, borazine, t-butylamine borazane, borazine, borazine, t-butylamine borazane, pyridine borane, 2,6-ruticine borane, ethylenediamine borane, hydrazine diborane, dimethylphosphine borane , phenylbosphineborane, dimethylarsineborane, phenylarsineborane, dimethylstibineborane, diethylstibinborane, and the like can be used.

These reducing agents are contained in the physical developer in an amount of, for example, 0.1 to
Preferably, m of 50 g/ρ is used.

In order to prevent heavy metal ions generated by dissolving the above-mentioned reducible heavy metal salts from precipitating as hydroxides, hydroxyl acids such as monocarboxylic acids, dicarboxylic acids, malic acid, and lactic acid are added to the physical developer. One or more complexing agents consisting of organic carboxylic acids such as carboxylic acid, succinic acid, citric acid, aspartic acid, glycolic acid, tartaric acid, ethylenediaminetetraacetic acid, gluconic acid, sugar acid, and quinic acid may be included. can. It is preferable that these complex chloride agents are used in a physical developer in a matrix of, for example, 1 to 1009/IQ. For improvement, pH adjusters such as acids and bases, buffers, preservatives, brighteners, surfactants, etc. are added as necessary according to conventional methods.

Among these additives, it is particularly preferable to use aqueous ammonia or aqueous sodium hydroxide solution in order to raise the pH.

Physical development may also be carried out under high speed plating conditions in a high temperature nickel plating bath of 65° C. to 90° C. using a sodium hypophosphite reducing agent or the same plating bath. It is also possible to selectively remove a portion of the transparent resin in the light transmitting portion by treating the image obtained at this time with an aqueous solution of 5% hydrochloric acid or 5% nitric acid for about 5 minutes, for example.

Furthermore, in photosensitive materials, in addition to the above-mentioned transparent resin, development inhibitor, metal complex compound, or metal compound system,
(a) Silver salt materials represented by organic silver salts such as silver halides and Dry Silver (registered trademark), (b) combination systems of diazonium salts and couplers, (c) Carbafilm (registered trademark), (d) Photopolymerizable photopolymer materials such as acrylic monomers, polyvinyl cinnamic acid, etc. (e) Toner image Cd forming
Electrophotographic photoreceptors such as 51Zn O and polyvinyl carbazole or their transfer bodies, electrophotographic materials such as thermoplastic electrophotographic photoreceptors that form (to)frost images, combinations of (to)leuco dyes and carbon tetrabromide system,(
H) Forming images of pigments or dyes such as Guirax (registered trademark) combination system of cobalt complex and leuco dye, (S) combination system of dioxalic acid and iron salt, (N) spiropyran, molybdenum tungsten compound, etc. Materials that can be used may be used.

Among the above-mentioned photosensitive materials, some types have light-shielding properties in exposed areas and light-transmitting properties in unexposed areas, while others have light-transmitting properties in exposed areas and light-blocking properties in unexposed areas. . In any case, any photosensitive material can be used as long as it can perform recording consisting of a light-transmitting area and a light-blocking area by developing as necessary after exposure.

However, among the above photosensitive materials, (a) a transparent resin as a binder, (a) a photodegradable development inhibitor having a diazo group or an azide group, and (c) a metal complex compound that becomes a metal development nucleus upon reduction. Alternatively, if a photosensitive material made of a metal compound is used, the light-shielding part can be read as a high-density material even when reading using near-infrared rays, and has the advantage of having high resolution and being able to be handled in a bright room.

As the light for irradiating such a photosensitive material, ultraviolet rays, visible light, infrared rays, X-rays, electron beams, etc. can be used.

On the first recording layer 2a consisting of a second recording layer light transmitting part and a light shielding part,
A second recording layer 2b made of a reflective metal 7s film layer is formed.

The reflective metal 7s film layer is made of Cr, Ti, Fe, Co.
, Ni, Cu1Ao, Au, Ge, AN, Ma, Sb
, Te, Pb, Pd, Cd, Bi, Sn
, Se, In, Ga, Rh, etc. alone or in combination.

When information is further written in the second recording layer 2b consisting of reflective gold [9119 layer] by irradiation with an energy beam, low melting point metals such as Te, Zn, and Pb are used.

It is preferable that the reflective gold ff4its film is composed mainly of metals such as Cd, Bi, Sn, Se, In1Qa, and Rb, particularly 7e-3e, Te-8e-
Pb, Te-Pb, Te-3n-8,S
Alloys such as n -Cu 1Te -Cu and Te -Cu-Pb are preferred.

Further, among these alloys, Te-CLI alloy containing 5 to 40 atomic percent Cu or T+3-Cu-Pb containing 5 to 40 atomic percent Cu and 1 to 50 atomic percent Pb to Cu. Alloys are particularly preferred when the wavelength of the readout irradiation energy beam is greater than or equal to 650 rv. When a reflective metal thin film layer made of these alloys is used as the second recording layer, recorded bits with less disturbance at the outer periphery can be obtained, and the wavelength of the readout irradiation energy beam is 650 no+ or more, especially 700 nm.
~ 900 n11, a reflective metal thin film can be obtained that has excellent information readout characteristics such that the reflectance in the bits, which are recorded areas, and the reflectance, that is, the relative reflectance, in the metal 'a film, which is an unrecorded area, are small. 5 Furthermore, 1~
When a 3n-Cu alloy containing 40 atomic percent of CU is used, a reflective metal thin film with less disturbance in the outer periphery of the recording bit shape and with low toxicity can be obtained.

When the second recording layer 2b made of the reflective metal WIwA layer is used simply as a reflective layer without writing information, Aj
It is preferable to form the reflective metal thin film layer using a metal or alloy having particularly excellent light reflectivity, such as SCr 2 , Ni 2 , A(J 2 , A(1), etc.).

In order to form such a reflective gold RF4 thin film layer on the first recording layer, the above-mentioned metal or alloy is prepared and coated using a sputtering method, vacuum evaporation method, ion blating method, electroplating method, etc. The film may be formed on the first recording layer by a conventionally known method. This reflective gold IF! The thickness of the thin film layer is 200 to 10,000, preferably 1
It is preferable that it is 000-50008. In some cases, a multilayer film made of the above metals, such as a ln film and a tea film, may be used.
! A multilayer film of 1 and 2 is also used as a reflective metal thin film. Further, composites of the above metals and organic compounds or inorganic oxides such as Te-CH, Te-C8, Te-styrene, Sn-802, Ge5-8n, Sn S-S Nato (F) 1111 Al-IhaSi02/ Ti/Si
Multilayer films such as 02/AΩ may also be used as reflective gold till films.

In addition, there are thin films made by aggregating pigments such as cyanine to give light reflectivity, films in which pigments or metal particles such as silver are dispersed in thermoplastic resins such as nitrocellulose, polystyrene, and polyethylene, or films made from thermoplastic resins such as pigments or metal particles such as silver. Reflective gold having pigments or metal particles aggregated on its surface can be used as the reflective gold.

Furthermore, a Tea compound, an SBA compound, whose reflectance changes due to a phase transition caused by energy beam irradiation,
Compounds such as MO oxide, Gem oxide, Vjl oxide, Sl oxide, Te oxide-Ge, and Te-3n are used as the reflective metal thin film.

In addition, chalcogen or colored M2O3-CIJ
1MOO3-8n-Ctl is used as the reflective metal thin film, and in some cases, a multilayer body of a bubble-forming organic thin film and a metal N film can also be used as the reflective metal thin film.

Furthermore, magneto-optical recording materials such as QdCo and 7bCo.

GdFe, DyFe, GdTbFc
.

Gd Fe Bi , Tb Dy Fe , Mn Cu
Bi and the like are also used as reflective metal thin films.

It is also possible to use a combination of various types of reflective metal thin films as described above.

L Plate 1 The hardened surface layer 6 increases the hardness of the surface of the optical recording section side of the optical card 1 and protects it, thereby preventing surface damage when the card is carried or used.

This increases the durability and writing/reading accuracy of the card, thereby improving its reliability.

Materials for this surface hardening layer include silicone-based, acrylic-based, melamine-based, urethane-based, epoxy-based hardeners, AJ
In addition to gold B oxides such as 203 and S f 02, plasma polymerized films and the like are used.

11 A method for manufacturing an optical card according to this embodiment will be explained.

First, a part of the surface of the material that will become the protective layer is subjected to a blimmer treatment, and a first recording layer and a second recording layer are provided on the surface to form an optical recording section. This protective layer serves as a card protective layer when assembled as an optical card.

Next, the card base material and the protective layer are laminated via an adhesive layer such as a thermal adhesive so that the second recording layer of the optical recording section is in contact with the card base material, and then heated to a temperature of about 90 to 150°C. An optical card can be manufactured by pressing with a heated roll or the like.

Depending on the case, an optical card can also be manufactured as follows. In other words, it is safe! After treating a part of the surface of the single layer material with a primer and providing a first recording layer and a second recording layer containing a hydrophilic resin as a binder on the surface, on the reflective metal thin film which is the second recording layer, A protective film such as acrylic resin is applied by screen printing to make this part water resistant. At this time, Ho ii! The peripheral edges of the layer are not provided with the protective coating. Next, this optical recording section is immersed in warm water,
After removing the hydrophilic resin in the area where the protective film is not provided, drying is performed.

On the other hand, if necessary, recesses for inserting the first and second recording layers of the optical recording section may be formed on the card base material such as white polyvinyl chloride film by heat pressing or the like. An adhesive layer is provided on.

Next, an optical card can be manufactured by folding the optical recording part and the card base material so that the second recording layer of the optical recording part is in contact with the card base material, and pressing them together with a hot roll or the like.

proof! 211 Writing information to the reflective metal thin film layer and reading information written to the optical card will be explained.

To write information on the reflective table fiiWIIJi, this gold rAN film layer is irradiated with an energy beam such as a laser beam with a wavelength of 300 to 110,001, focused by a lens, etc., and the metal in the irradiated area is evaporated or unevenly distributed and recorded. This is done by forming bits.

At this time, the intensity of the energy beam is 0.1 to 100'I
rLW1 pulse 11] is 5 n5ec ~ 500 m5
ec, the beam diameter is preferably 0.1 to 100 μm.

As the energy beam irradiated onto the reflective metal thin film layer, a laser beam such as a semiconductor laser, an argon laser, a helium-neon laser, an infrared flash, or the like is used.

- To read the information written on the optical card according to Rikiki's invention, the optical card is protected by using a low-energy energy beam, white light, tungsten light, etc. that does not melt the reflective metal thin film layer through a lens, etc. This is carried out by condensing and irradiating light onto the first recording layer and the second recording layer, which are made up of a light-transmitting part and a light-blocking part, from the layer side, and detecting the intensity of the reflected light in association with the phase change.

- As mentioned above, the light-shielding part in the first recording layer is formed with a color close to black due to metal precipitated around the metal development nucleus, so the readout irradiation beam is irradiated onto this light-shielding part. Then, the irradiation beam is absorbed in this part and the reflectance becomes small. On the other hand, in the light transmitting part, the irradiation beam reaches the reflective metal thin film layer without being absorbed much, so the reflectance in this light transmitting part becomes a large value.

Further, in the reflective gold rIf4 thin HE, a high reflectance is obtained in the metal thin film layer corresponding to the unrecorded part, whereas a low reflectance is obtained in the bit part corresponding to the recorded part.

In this way, the difference in transmittance between the light-shielding part and the light-transmitting part in the first recording layer, and the difference in reflectance between the bit part and the unrecorded part in the second recording layer, can be considered as a phase change.
The information written on the optical card according to the present invention can be read out by reading out the information written in the optical card according to the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an optical card according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of another embodiment of an optical card according to the present invention, and FIG. 3 is a cross-sectional view of an optical card according to the present invention. FIG. 2 is a plan view of one card showing an example. DESCRIPTION OF SYMBOLS 1... Optical card, 2... Optical recording part, 2a... 1st
Recording layer, 2b...Second recording layer 1.3...Protective layer, 4
... Car 17 base material, 4a... Opaque base material, 4b...
- Transparent base material, 5... Brimer treatment, 6... Surface hardening layer, 7... Adhesive layer.

Claims (1)

[Claims] An optical card in which an optical recording part and a protective layer are laminated on a card base material, and the adhesive force between the protective layer that clamps the optical recording part and/or the card base material and the optical recording part is different within the adhesive surface. An optical card that is characterized by: