JPH06342485A - Information card - Google Patents

Abstract

PURPOSE:To provide the merit of an optical card equipped with an optical recording part and to write information changing with time or required to be changed by recording the information, which is not required to be changed with its recording contents, in the optical recording part and recording the information required to be changed in an IC recording part. CONSTITUTION:This card is formed by providing an optical recording part 3 and an IC recording part 4 on a card base 2, this IC recording part 4 is composed of an IC module integrating electric elements including an IC chip and a wiring circuit, and this IC module is embedded in the card base 2. Thus, an information card 1 is provided with the optical recording part 3 and the IC recording part 4, concerning this information card 1, the items requiring no change such as a seal impression pattern, fingerprint, face photograph and voiceprint personal identification number, are recorded in the optical recording part 3 and the items changing with time or required to be changed such as the total amount of deposit, the remainder of deposit and the history of use are recorded in the IC recording part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information card, and more particularly to an information card having an IC recording section capable of changing recorded contents and an optical recording section capable of changing and tampering recorded contents.

[0002]

2. Description of the Related Art Conventionally, magnetic materials have been mainly used as recording materials embedded in cards such as credit cards and bank cards. This magnetic material has an advantage that information can be written and read easily, but on the other hand, it has a problem that information can be easily tampered with and high-density recording cannot be performed.

In order to solve the above problems, the photosensitive material is subjected to pattern exposure to form a light transmitting portion which is an unexposed portion and a light shielding portion which is an exposed portion. There has been proposed an optical recording material of a type in which information is written in and read out by the difference in light transmittance.

On the other hand, there is also an attempt to read information based on a difference in light reflectivity instead of reading information based on a difference in light transmittance. For example, cards which have a recording layer in which silver particles are dispersed in a gelatin matrix have been proposed. Writing of information to the recording layer is performed by irradiating the recording layer with a laser beam to form recording pits. This recording layer can be continuously manufactured by a coating method, and by using silver, uniform reflectance can be obtained over a wide wavelength range, and it can be applied to a recording / reproducing apparatus using laser beams of various wavelengths. It has the advantage of

On the other hand, the recording layer of the recording material is irradiated with an energy beam such as a laser beam in a spot shape,
A so-called heat mode recording material has been proposed, which records by changing a part of the recording layer. As the recording layer used for this heat mode recording material, a metal thin film such as tellurium or bismuth, an organic thin film such as polystyrene or nitrocellulose, or a tellurium low oxide film utilizing phase transition is used. These recording materials are so-called DRAW (direct read af) that can be "read directly after writing" without the need for development processing after writing information.
ter write) medium, and has the advantage that high density recording is possible and additional writing is possible.

However, in an optical card having an optical recording section made of an optical recording material as described above, once the information is written in the optical recording section, the written information cannot be changed. However, there is a problem in that it is not possible to record matters that change or need to be changed, such as the deposit balance or the usage history. Further, in an optical card having an optical recording section, it may be preferable that the portion corresponding to the index of written information is changeable information. As described above, the optical card having the optical recording unit has a problem that the information that needs to be changed cannot be written.

The present invention is intended to solve the problems associated with the prior art as described above, and has the advantages of an optical card having an optical recording section, and can be changed from moment to moment. The purpose of the present invention is to provide an information card in which information that needs to be changed can be written.

[0008]

In an information card according to the present invention, both an optical recording section and an IC recording section are provided on the same medium, and information whose recorded content does not need to be changed is recorded in the optical recording section. Information whose contents need to be changed is recorded in the IC recording unit.

The information card according to the present invention will be described below with reference to specific examples shown in the drawings. Information card 1 according to the present invention
As shown in the sectional view of FIG. 1, the card is formed by providing an optical recording section 3 and an IC recording section 4 on the card substrate 2, and in some cases, on the card substrate 2. The protective film 5 may be provided on the.

As the card base material 2, any material that can be used as a base material of an ordinary card can be used. Specifically, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, polyvinylidene chloride, acrylic polymer such as polymethylmethacrylate, polystyrene, polyvinyl butyral, acetyl cellulose, styrene / butadiene copolymer, polyethylene, Polypropylene, polycarbonate, etc. are used. In some cases, iron,
Metal sheets such as stainless steel, aluminum, tin, copper and zinc, synthetic paper, paper and the like can also be used. Furthermore, a laminate of the above materials can also be used.

As the optical recording section 3, known ones can be widely used, including those exemplified below. (a) Metal thin films such as tellurium and bismuth, polystyrene,
An optical recording part made of a recording material such as an organic thin film such as nitrocellulose or a tellurium low oxide film using phase transition. Writing of information to this optical recording part is performed by spotting an energy beam such as a laser beam. The optical recording unit is irradiated in a uniform manner and the state of a part of the recording unit is changed, and when reading the written information, the recording unit is irradiated with recording / reproducing light and the intensity and phase of the reflected light are associated with each other. It is performed by detecting.

(B) An optical recording section in which silver particles are dispersed in a gelatin matrix, and information is written in the optical recording section by irradiating the recording section with an energy beam such as a laser beam. By forming
The written information is read by irradiating the recording portion with recording / reproducing light and detecting the intensity and phase of the reflected light in association with each other.

(C) An optical recording section in which a photosensitive material composed of a compound having a photosensitive group such as a diazo group is dispersed in a matrix, and information is written by subjecting the optical recording section to pattern exposure. The light-transmitting portion which is an unexposed portion and the light-shielding portion which is an exposed portion are formed, and the reading of the written information is performed by irradiating the recording portion with the recording / reproducing light to determine the difference in the light transmittance and the phase. Are associated and detected.

(D) (i) a substrate for an optical recording material, (ii) a first recording layer provided on the lower surface of the substrate, the first recording layer comprising a light transmitting portion and a light shielding portion, and (iii) the first recording layer. An optical recording section comprising a second recording layer formed of a reflective metal thin film layer provided on the lower surface of the recording layer, wherein the optical recording section is a second recording layer on a card substrate.
The recording layers are provided in contact with each other. This optical recording unit 3
FIG. 2 shows a sectional view of the above.

The optical recording material 3 includes (a) a base material 6 for optical recording material, and (b) a first recording layer 9 provided on a lower surface of the base material, the first recording layer 9 including a light transmitting portion 7 and a light shielding portion 8. (C) This first
The second recording layer 10 is provided on the lower surface of the recording layer 9 and is composed of a reflective metal thin film layer. Each layer will be described in detail below.

As the base material 6 for the optical recording material, glass, ceramic, paper, plastic film, which is transparent to light,
Although any type of material such as woven cloth and non-woven cloth can be used, glass or plastic film is preferable in terms of productivity and smoothness. As the plastic, a cellulose derivative, a polyester resin, a polycarbonate resin, a vinyl resin, a polyimide resin, an acrylic resin, a polyether resin, a polysulfone resin, a polyamide resin, or the like can be used, and in terms of dimensional stability and smoothness. , Cellulose triacetate, polyethylene terephthalate, and polyimide are particularly preferable. If necessary, these base materials 6 may be subjected to a pretreatment such as corona discharge treatment, plasma treatment, or primer treatment for improving the adhesiveness.

The first recording section 9 is composed of a light transmitting section 7 and a light shielding section 8. The first recording portion 9 is formed, for example, by pattern-exposing a photosensitive material having an unexposed portion light-transmitting and an exposed portion light-shielding, and then developing. In some cases, the first recording section 9 may be formed by pattern-exposing and developing a photosensitive material in which the unexposed area becomes light-shielding and the exposed area becomes light-transmissive.

The photosensitive material is, for example, (a) a transparent resin as a binder, (b) a photodecomposable development inhibitor having a diazo group or an azido group, and (c) a metal complex compound which becomes a metal development nucleus when reduced. It is composed of a metal compound. In this photosensitive material, the photodecomposable development inhibitor having a diazo group or an azide group is present in an amount of 1 to 100 parts by weight, preferably 20 to 50 parts by weight, based on 100 parts by weight of the transparent resin as a binder. The metal complex compound or metal compound that is reduced to metal development nuclei is 0.1 to 1
It is present in an amount of 00 parts by weight, preferably 1 to 10 parts by weight. The above-mentioned development inhibitor, metal complex compound or metal compound is dissolved or dispersed in a transparent resin as a binder, but preferably dissolved.

As the transparent resin, either a lipophilic or hydrophilic transparent resin can be used. Examples of the lipophilic transparent resin include polyvinyl acetate resin, vinyl acetate / acrylic ester copolymer resin, acrylic acid / vinyl acetate copolymer resin, ethylene / vinyl acetate copolymer resin having ester groups, cellulose acetate, etc. Examples thereof include a resin having a hydroxyl group and a modified vinyl acetate resin having a carboxylic acid group or a sulfonic acid group.

Further, it is also effective for increasing the sensitivity to add a cellulose derivative such as nitrocellulose having a property of being deformed in a heat mode in view of optical recording characteristics to these lipophilic transparent resins.

Examples of the hydrophilic transparent resin include natural polymer compounds such as gelatin, casein, glue, gum arabic, shellac, carboxymethyl cellulose, ovalbumin, polyvinyl alcohol (partially saponified polyvinyl acetate), polyacrylic acid. Although synthetic resins such as polyacrylamide, polyvinylpyrrolidone, polyethylene oxide, and maleic anhydride copolymer are used, other than the above, as long as it is a water-soluble or hydrophilic resin. The hydrophilic transparent resin as a binder has such a hydrophilicity that the physical developing solution penetrates into the photosensitizer layer to enable physical development when the photosensitive material layer is formed of the transparent resin and brought into contact with the physical developing solution. It is preferable to have a property.

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 characteristics, in ethanol and add it to the above hydrophilic transparent resin.

As the development inhibitor, a compound having a diazo group or an azide group is used. The compound having a diazo group is preferably a zinc chloride double salt having a diazo group or a borohydride salt, or a compound which is a condensation product obtained from these compounds and paraformaldehyde.
More specifically, p-N, N-diethylaminobenzenediazonium zinc chloride double salt, p-N-ethyl-N-β hydroxyethylaminobenzenediazonium zinc chloride double salt, 4-morpholino 2,5-diethoxybenzene Diazonium zinc chloride double salt, 4-morpholino 2,5-
Dibutoxybenzenediazonium zinc chloride double salt, 4-benzoylamino-2,5-diethoxybenzenediazonium zinc chloride double salt, 4- (4'-methoxybenzoylamino) -2,5-diethoxybenzenediazonium zinc chloride double salt 4- (p-toluylmercapto) -2,5-
Dimethoxybenzenediazonium zinc chloride double salt, 4-diazo-4'-methoxydiphenylamine zinc chloride double salt,
Zinc chloride double salt having a diazo group such as 4-diazo-3-methoxy-diphenylamine zinc chloride double salt or the above borofluoride salt instead of the above zinc chloride double salt,
Sulfates, phosphates, etc. can also be used.

The compounds having an azido group include p-azidoacetophenone, 4,4'-diazidochalcone,
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 and the like can be used. Compounds other than the above may be used as long as they have a diazo group or an azido group, and two or more compounds having the above-mentioned diazo group or azido group may be optionally used in combination.

When a compound having a diazo group is used, it is preferable to use a stabilizer that stabilizes this compound, and an organic carboxylic acid or an organic sulfonic acid can be used as this stabilizer, which is more practical. It is preferable to use p-toluenesulfonic acid.

Next, the metal complex compound or metal compound which is reduced to form metal development nuclei will be described. First, as a metal complex compound that is reduced to form a metal development nucleus, a complex compound of a metal such as palladium, gold, silver, platinum, or copper is used, and a ligand serving as an electron donor is usually used for these metals. Known ones can be used. Specifically, the following metal complex compounds are used.

Bis (ethylenediamine) palladium (I
I) Salt, dichloroethylenediaminepalladium (II)
Salt, dichloro (ethylenediamine) platinum (V) salt, tetrachlorodiammineplatinum (IV) salt, dichlorobis (ethylenediamine) platinum (IV) salt, tetraethylammonium copper (II) salt, bis (ethylenediaminecopper (II) salt.

If a so-called chelating agent having a cyclic structure coordinated at two or more positions is used as the ligand forming the metal complex compound, the stability of the metal complex compound formed is high. It is suitable. Examples of the chelating agent include primary, secondary or tertiary amines, oximes, imines, and ketones. More specifically, dimethylglyoxime, dithizone, oxine, acetylacetone, glycine, Compounds such as ethylenediaminetetraacetic acid, nitrilotriacetic acid, and uramildiacetic acid are used.

Examples of the above-mentioned chelating agent include bis (2,2'-bipyridine) palladium (II)
Salt, bis (acetylacetonato) palladium (II),
Bis (N, N-diethylethylenediamine) copper (II)
Salt, bis (2,2'-bipyridine) copper (II) salt, bis (1,10-phenanthroline) copper (II) salt, bis (dimethylglyoximate) copper (II), bis (acetylacetonato) copper (II), bis (acetylacetonate)
Platinum (II) and the like are preferable.

As the metal compound that is reduced to give a metal development nucleus, a metal compound such as a chloride of a metal such as palladium, gold, silver, platinum or copper, or a water-soluble salt such as a nitrate is used. Salts of palladium chloride, silver nitrate, gold tetrahydrochloride, etc. contained in the activator solution for electroless plating are preferable, and of these, the salt of palladium is particularly preferable.

As described above, (a) a transparent resin as a binder, (b) a photodecomposable development inhibitor having a diazo group or an azide group, and (c) a metal complex compound which becomes a metal development nucleus when reduced, or The metal compound is mixed with a solvent selected according to the transparent resin as a binder to form a coating solution for forming a photosensitive material layer having a viscosity suitable for coating of 10 to 1000 centipoise. The coating liquid for forming the photosensitive material layer is usually applied on the substrate 6 for optical recording material in an amount of 0.1
The photosensitive material layer is formed by applying a film having a thickness of ˜30 μm.

As the solvent for dissolving the transparent resin as the binder, various solvents can be used. When a hydrophilic transparent resin is used, water or water and a lower alcohol,
A mixed solvent with a water-miscible solvent such as ketone or ether is used. When a lipophilic transparent resin is used, 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 n-butyl acetate, and polar such as methyl cellosolve. Solvents having a high viscosity are preferably used.

When a hydrophilic transparent resin is used, it is desirable to carry out a film hardening treatment after forming the photosensitive material layer in order to suppress elution of the binder and the like into the developing solution during the physical development processing. The film-hardening treatment is carried out, for example, by adding the following compound in an amount of 0.1 to 100 parts of the transparent resin in the coating solution for forming a photosensitive material.
It can be carried out by premixing in an amount of 50 parts or by coating an aqueous solution of the following compound on the already formed photosensitive material layer.

A such as Kari Ming Bun, Ammonium Ming Bing
Compounds: Cr compounds such as chromium alum and chromium sulfate; aldehydes such as formaldehyde, glyoxal, glutaraldehyde, 2-methylglutaraldehyde, succinaldehyde; o-benzoquinone, p-benzoquinone, cyclohexane-1,2- Diketones such as dione, cyclopentane-1,2-dione, diacetyl, 2,3-pentanedione, 2,5-hexanedione and 2,5-hexenedione; epoxides such as triglycidyl isocyanurate; tetraphthaloyl chloride , 4,
4'-diphenylmethanedisulphonyl chloride, 4,
Acid anhydrides such as 4'-diphenylmethanedisulfonyl chloride; tannic acid, gallic acid, 2,4-dichloro-
6-hydroxy-s-triazine, and the general formula R _{2
NPOX 2, (R 2 N)} n POX 3-n, (CH 2 -N-CH
₂ ) ₂ PR, (CH ₂ —N—CH ₂ ) ₂ POR and R
-N = C = N-R ' ( where R is an alkyl group having a carbon 2 to 6, R' is ^{_{(CH 3) 3 N + (}} CH 3) 3 X - group, X is F or Cl, n is 1 Or a carbodiimide represented by 2); styrene / maleic acid copolymer, vinylpyrrolidone / maleic acid copolymer, vinyl methyl ether / maleic acid copolymer, ethyleneimine /
Resins such as maleic acid copolymer, methacrylic acid / methacrylonitrile copolymer, polymethacrylamide, methacrylic acid ester copolymer, glutaric acid, succinic acid, malic acid, lactic acid, citric acid, aspartic acid, glycolic acid , Tartaric acid, etc.

In this way, the photosensitive material layer provided on the optical recording material substrate 6 is pattern-exposed and then developed to develop a light-transmitting portion 7 which is an unexposed portion and a light-shielding portion 8 which is an exposed portion. To form the first recording layer 9. The pattern exposure can be performed through a mask such as a photomask.

It is also possible to form the light-shielding portion 8 in a pattern by converging the irradiation light into a beam and directly irradiating the photosensitive material layer.

The image information provided by the light transmitting portion 7 and the light shielding portion 8 in the first recording layer 9 serves as tracking and pre-formatting when reading the information itself or the information.

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

As the light source used for the exposure, any light source capable of decomposing a compound having a diazo group or an azido group can be arbitrarily used, and an ultrahigh pressure mercury lamp is usually preferably used.

The latent image formed by decomposition of the compound having a diazo group or azido group by the above-mentioned pattern exposure is brought into contact with an aqueous solution of a reducing agent to generate metal development nuclei. In the unexposed area, since the development inhibitor having a diazo group or an azido group is not decomposed, metal development nuclei do not occur even when contacted with the reducing agent aqueous solution and remain as the light transmitting area.

Examples of the reducing agent used in this case include stannous chloride, stannous sulfate, sodium borohydride, borazine compounds such as dimethylamine borazane, diethylamine borazane and trimethylamine borazane, borane,
Borane compounds such as diborane and methyldiborane, hydrazine and the like are used. Of these, an acidic stannous chloride solution, a stannous sulfate solution (weiss solution) or a commercially available sensitizer solution for electroless plating is particularly preferable, but generally any strong reducing agent can be used.

Then, when the metal developing nuclei thus obtained are brought into contact with a physical developing solution, the metal contained in the physical developing solution is reduced, and the metal developing nuclei are mainly deposited to form a light-shielding portion. 8 is formed.

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, for example, water-soluble salts of Group VIb metals such as nickel, cobalt, iron and chromium and Group Ib metals such as copper are used alone or in combination. It is also possible to obtain a tin or tin / copper-based metal layer by carrying out physical development once with a copper salt solution and then displacement plating with stannous chloride or tin sulfate. Among these, safety,
Nickel, copper, and tin are preferable in consideration of storability. However, unlike vapor deposition, a small amount of different metals or elements such as phosphorus and sulfur may be mixed from the raw material purity, plating stabilizer, etc., but this does not particularly affect the characteristics as an optical recording material.

Suitable water-soluble reducible metal salts include:
Specifically, the following are used. Heavy metal halides such as cobaltous chloride, cobaltous iodide, ferrous bromide, ferrous chloride, chromic bromide, chromic iodide, cupric chloride; nickel sulfate, ferrous sulfate , Heavy metal sulfates such as cobaltous sulfate, chromic acid sulfate, cupric sulfate; heavy metal nitrates such as nickel nitrate, ferrous nitrate, cobaltous nitrate, chromic acid nitrate, cupric nitrate; ferras acetate , Organic salt of metal such as cobaltate acetate, chromic acetate, cupric formate.

These reducible heavy metal salts are preferably contained in the physical developer in an amount of, for example, 10 to 100 g / l.

Examples of the reducing agent include hypophosphorous acid, sodium hypophosphite, sodium borohydride, hydrazine, formalin, diethylamine borane, dimethylamine borane, trimethylamine borane, borane, diborane, methyldiborane, diborazane, borazene, Borazine, t-butylamine borazane, pyridine borane, 2,
6-lutidine borane, ethylenediamine borane, hydrazine diborane, dimethylphosphine borane, phenylphosphine borane, dimethyl argin borane, phenyl argin borane, dimethyl stibine borane, diethyl stibine borane, etc. can be used.

These reducing agents are preferably used in the physical developer in an amount of, for example, 0.1 to 50 g / l.

In the physical developer, for example, monocarboxylic acid, dicarboxylic acid, malic acid, lactic acid are used in order to prevent heavy metal ions generated by the dissolution of the reducible heavy metal salt from precipitating as hydroxide. Hydroxycarboxylic acid such as; succinic acid, citric acid, aspartic acid, glycolic acid, tartaric acid, ethylenediaminetetraacetic acid, gluconic acid, sugar acid, quinic acid, etc. Can be made. These complex chloride agents are contained in the physical developer in an amount of, for example, 1 to 1
It is preferably used in an amount of 00 g / l.

Further, in the physical developer, in order to improve the storability and operability of the developer and the quality of the obtained image, a pH adjusting agent such as acid and base, a buffering agent, a preservative,
A whitening agent, a surfactant and the like are added according to a conventional method as needed.

Among these additives, when the pH is raised with ammonia, it is easy to obtain gloss on the surface of the photosensitive material.
It is particularly preferable to use an ammonium salt or a pH adjusting agent composed of ammonium salt and ammonia as the H adjusting agent.

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

As the photosensitive material, in addition to the above-mentioned transparent resin, development inhibitor, metal complex compound or metal compound-based system, (a) silver halide, dry silver (registered trademark), etc. Silver salt materials, typified by organic silver salts of
(B) Combination system of diazonium salt and coupler, (c)
Diazo-based material represented by Culver film (registered trademark), PD process (registered trademark) material, etc., (d) Acrylic monomer, photopolymerization type photocrosslinking type photopolymer-based material represented by polyvinylcinnamic acid, etc. (E) An electrophotographic photosensitive member such as CdS, ZnO, or polyvinylcarbazole that forms a toner image or a transfer body thereof, (f) an electrophotographic material such as a thermoplastics electrophotographic photosensitive member that forms a frost image, or (g) Combination system of leuco dye and carbon tetrabromide, (h) Combination system of Dilux (registered trademark) cobalt complex and leuco dye, (ri) Combination system of oxalic acid secondary acid and iron salt, (nu) Materials such as spiropyran and molybdenum-tungsten compounds that form an image of a pigment or dye may be used.

Among the above-mentioned photosensitive materials, some of the photosensitive materials have light-shielding properties in the exposed areas and light-transmitting in the unexposed areas, while some materials have light-transmitting properties in the exposed areas and light-shielding in the unexposed areas. It is sex. In any case, any photosensitive material can be used as long as it is possible to perform recording consisting of a light transmitting portion and a light shielding portion by developing after exposure after exposure.

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

Next, the second recording layer 10 made of a reflective metal thin film layer is formed on the first recording layer 9 made of the light transmitting portion 7 and the light shielding portion 8 formed as described above.

The reflective metal thin film layer is made of Cr, Ti, Fe,
Co, Ni, Cu, Ag, Au, Ge, Al, Mg, S
b, Te, Pb, Pd, Cd, Bi, Sn, Se, I
It is formed by using metals such as n, Ga, and Rb alone or in combination of two or more kinds.

Second recording layer 10 comprising a reflective metal thin film layer
In the case of writing information in the area by irradiation with an energy beam, low melting point metals Te, Zn, Pb, Cd, Bi,
It is preferable that the reflective metal thin film is composed mainly of a metal such as Sn, Se, In, Ga or Rb, and especially Te
-Se, Te-Se-Pb, Te-Pb, Te-Sn-
Alloys such as S, Sn-Cu, Te-Cu, Te-Cu-Pb are preferred.

Further, among these alloys, a Te-Cu alloy containing 5 to 40 atomic percent Cu or 5 to 40 atomic percent
40 atomic percent Cu and 1-5 for Cu
A Te-Cu-Pb alloy containing 0 atomic percent Pb is particularly preferable when the wavelength of the irradiation energy beam for reading is 650 nm or more. When the reflective metal thin film layer made of these alloys is used as the second recording layer, recording pits with less disturbance in the outer peripheral portion can be obtained, and the wavelength of the irradiation energy beam for reading is 650 nm or more, particularly 700 to
When the thickness is 900 nm, a reflective metal thin film having excellent information reading characteristics such that the reflectance in the pit which is the recorded portion and the reflectance in the metal thin film which is the unrecorded portion, that is, the relative reflectance is small is obtained.

Further, when a Sn-Cu alloy containing 1 to 40 atomic percent Cu is used, a reflective metal thin film having less disorder in the outer peripheral portion of the recording pit shape and low toxicity can be obtained.

Second recording layer 10 comprising a reflective metal thin film layer
When the information is not written on and is simply used as the reflective layer, it is preferable to form the reflective metal thin film layer of a metal or an alloy such as Al, Ni, Ag, and Au which is particularly excellent in light reflectivity.

In order to form such a reflective metal thin film layer on the first recording layer, a metal or alloy as described above is prepared, and this is sputtered, vacuum deposited, ion plated or electroplated. The film may be formed on the first recording layer by a conventionally known method such as a method. The thickness of the reflective metal thin film layer is preferably 200 to 1000 angstrom. In some cases, a multilayer film made of the above metal, for example, a multilayer film of In film and Te film is also used as the reflective metal thin film. In addition, a complex of the above metal and an organic compound or an inorganic oxide, such as Te-CH ₄ , T
e-CS ₂ , Te-styrene, Sn-SO ₂ , Ges-
Thin film of Sn, SnS-S, etc. or SiO ₂ / Ti /
A multilayer film such as SiO ₂ / Al can also be used as the reflective metal thin film.

Further, a thin film obtained by aggregating a dye such as cyanine with light reflectivity, a resin in which a dye or metal particles such as silver is dispersed in a thermoplastic resin such as nitrocellulose, polystyrene, polyethylene, or the like. A material obtained by aggregating a pigment or metal particles on the surface of a plastic resin can be used as the reflective metal thin film.

Furthermore, a Te oxide, which undergoes a phase transition upon irradiation with an energy beam to change its reflectance,
Sb oxide, Mo oxide, Ge oxide, V oxide, Sm
Oxides or compounds such as Te oxide-Ge and Te-Sn can be used as the reflective metal thin film.

In addition, chalcogen or coloring type Mo
O ₃ —Cu and MoO ₃ —Sn—Cu are used as the reflective metal thin film, and in some cases, a multilayer body of a foam-forming organic thin film and a metal thin film can also be used as the reflective metal thin film.

Furthermore, GdCo and Tb which are magneto-optical recording materials are used.
Co, GdFe, DyFe, GdTbFe, GdFeB
i, TbDyFe, MnCuBi, CrO ₂ BiSmE
rGdIG, GdBiGaIG, GdBFaBiIG, etc. can also be used as a reflective metal thin film.

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

Next, the IC recording section 4 will be described. IC
The recording unit 4 is composed of an IC module in which electrical elements including an IC chip and a wiring circuit are integrated, and the IC module is embedded in the card base material 2. An electrode for connecting the IC module to the external power supply is provided on the surface of the card. In order to embed the IC module in the card base material 2, a recess suitable for embedding the IC module in the card base material 2 is cut out, the IC module is fitted into this recess, and then both are bonded.

The structure of this IC module and the method of embedding it in a card base material are conventionally known.

The information card 1 according to the present invention has the optical recording section 3 and the IC recording section 4 as described above,
In this information card, for example, items such as a seal stamp pattern, a fingerprint, a facial photograph, and a voiceprint personal identification number that do not need to be changed are recorded in the optical recording unit 3, and the total deposit amount, the deposit balance, the usage history, and the like change every moment. Items that need to be changed are recorded in the IC recording unit 4.

[0071]

Since the information card according to the present invention has the optical recording section and the IC recording section, the following effects can be obtained. (a) Much higher density recording is possible compared to magnetic cards. (b) Since the items that do not need to be changed are recorded in the optical recording unit, it is extremely difficult to falsify the records and the safety is high. (c) Since information that changes moment by moment or needs to be changed is recorded in the IC recording unit, an extremely large amount of information can be recorded as an information card.

[Brief description of drawings]

FIG. 1 is a sectional view of an information card according to the present invention.

FIG. 2 is a sectional view showing an example of an optical recording unit used in the information card according to the present invention.

[Explanation of symbols]

 1 Information card 2 Card base material 3 Optical recording unit 4 IC recording unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G06K 19/08 G11B 7/24 571 F 7215-5D

Claims (1)

[Claims] 1. An optical recording unit and an IC recording unit are provided on the same medium, information whose recording contents do not need to be changed is recorded in the optical recording unit, and information whose recording contents need to be changed is recorded in the IC recording unit. Information cards that are characterized by being.