JPH11161959A - Optical card provided with visible information recording layer and visible information recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical card provided with a visible information recording layer in which visible information are strong against the friction of a card surface and displays are not stained also. SOLUTION: In an optical card having at least a transparent substrate 3, an optical layer 1, a transparent protective layer 5 and a visible information recording layer 7 in this order, this optical card is an optical card provided with a visible information recording layer in which first visible information are readable through the optical recording layer 1 from a side from which the light beam of an optical recording is irradiated and the visible information recording layer 7 is formed from a DRAW possible recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium, and more particularly to an optical card having a visible information recording layer and a method for recording visible information on the optical card.

[0002]

2. Description of the Related Art At present, card-shaped information recording media having excellent portability, such as magnetic cards, are widely and widely used. In recent years, IC cards, optical cards, and the like have been widely used as larger-capacity memories. Proposed. Further, as disclosed in Japanese Patent Application Laid-Open No.
Many hybrid cards combining the above functions have been proposed.

By the way, a hybrid card combining the functions of magnetic, optical and IC has a specified card size (8
Each component must be arranged within (5.6 mm x 54 mm). For magnetic stripes and ICs with fixed sizes, optical recording requires more recording areas to increase the capacity. Therefore, various arrangements have been proposed for the arrangement of each element of the hybrid card.

[0004] On the other hand, logo printing and design printing showing the attributes of the card are performed on the surface of the card, and personal information such as the card owner's name, identification number, face photograph, and the like, embossed characters and bar codes are printed. Are also provided.

In order to effectively arrange such information in a limited space, Japanese Patent Application Laid-Open No. Hei 2-30595 discloses that a card is printed in advance on a protective substrate at a position corresponding to an optical recording area, and is passed through an optical recording layer. The present applicant has proposed a configuration in which visible information can be read from the side where the light beam incident on the optical recording layer is irradiated.

[0006]

In a personally owned card such as a credit card or various ID cards, attribute information about the owner, for example, information such as the owner's name, account number, and face photo is indispensable. The information about the card owner is usually additionally printed on the card surface when the card is issued. Further, like a prepaid card, transaction information, balance, and the like are usually added or rewritten after the card has been delivered to the user.

[0007] However, since the display of the added / rewritten information is performed on the surface of the card, there is a problem that the information becomes invisible due to friction of the surface. In addition, an optical card has an optical recording layer in which information is recorded and reproduced by light, and recording and reproduction are performed by light through a transparent substrate. There was a problem that it could not be formed. Further, in addition to the optical recording, a combination of other information recording methods, for example, in the case of an optical IC hybrid card,
There is a problem that a rewritable visible information area cannot be sufficiently secured.

In view of the above problems, the present invention displays an area of visible information which is additionally added or rewritten at the time of issuance of a card or after issuance, on the inner surface of the card, and the visible information reduces friction on the surface of the card. It is an object of the present invention to provide an optical card with a visible information recording layer that is strong and does not stain the display, and a method of recording visible information on the optical card.

[0009]

That is, the present invention relates to an optical card having at least a transparent substrate, an optical recording layer, a transparent protective layer, and a visible information recording layer in this order. An optical card with a visible information recording layer, wherein the optical card can be read visually from the side irradiated with the beam through the optical recording layer, and the visible information recording layer is formed of a recordable recording medium.

Further, the present invention has at least a transparent substrate, an optical recording layer, a transparent protective layer, and a visible information recording layer in this order, and the first visible information is provided from the side irradiated with the optical recording light beam. A method for recording visible information on an optical card that is visually readable through an optical recording layer and is formed on a recording medium on which a visible information recording layer is recordable, wherein the first visible information is recorded on the optical card. A visible information recording method for an optical card with a visible information recording layer, wherein the recording is performed from a side opposite to a side of the recording layer in contact with the transparent protective layer.

In the optical card with a visible information recording layer according to the present invention (hereinafter abbreviated as an optical card), the surface of the visible information recording layer opposite to the transparent protective layer is viewed from a direction in which the optical recording light beam is not irradiated. It is preferable that a concealing layer is provided so that the visible information recording layer is not visible, and a second visible information layer is further provided on the surface of the concealing layer.

Further, it is preferable that the visible information recording layer is formed of a rewritable recording medium. Further, the visible information recording layer is preferably made of a heat-sensitive material. Further, it is preferable that the visible information recording layer is made of a material that can be displayed by magnetism. Further, the wavelength of the optical recording layer is 400 to 600 n.
It is preferable that the transmittance in the visible light region of m is 10% or more. Further, it is preferable that the optical recording layer contains a polymethine dye.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic plan view showing a first embodiment of the optical card of the present invention, FIG. 2 is a bottom view of FIG. 1, and FIG.
It is sectional drawing. 1 to 3, 1 is an optical recording layer, 2 is a transparent hard coat layer, 3 is a transparent substrate, 4 is an adhesive layer, 5 is a transparent protective layer, 6 is a preformat pattern formed on a transparent substrate, and 7 is visible. Information recording layer, 8 is a shielding layer, 9 is a second visible information layer, 10 is an overcoat layer, 11 is a light beam for recording and reproducing information on the optical recording layer, and 12 is the first visible information added.・ Heat and magnetic field for rewriting.

An optical card according to the present invention is an optical card having at least a transparent substrate 3, an optical recording layer 1, a transparent protective layer 5, and a visible information recording layer 7 in this order, wherein the first visible information is optical recording light. It is characterized in that it is readable from the side irradiated with the beam 11 through the optical recording layer 1 and the visible information recording layer 7 is formed of a recordable recording medium.

Reference numeral 7 denotes a visible information recording layer, which has first visible information on the side facing the optical recording layer 1. That is, the visible information recording layer 7 is composed of a first layer 7a forming the whole view of the first visible information and a second layer 7b forming the background of the first visible information. A visible information recording layer 7 is formed. (See Fig. 3)
The visible information recording layer 7 is formed so as to overlap the optical recording area 1a, as shown in FIG. Here, when the visible information recording layer 7 itself is opaque, the background second layer 7b may not be provided. Also, the visible information recording layer on the card plane does not necessarily have to be in the optical recording area, and may be provided over the entire surface of the card.

Reference numeral 8 denotes a shielding layer, and 9 denotes a second visible information layer formed on the shielding layer. The shielding layer 8 may also serve as the second layer 7b constituting the background of the visible information recording layer 7 described above. The second visible information layer 9 forms second visible information with the shielding layer 8 as a background. Reference numeral 10 denotes a transparent overcoat layer for protecting the second visible information layer 9.

Numeral 11 is for recording information on the optical recording layer 1.
Alternatively, it is a light beam for reproducing information recorded on the optical recording layer 1. The optical recording layer 1 has a predetermined transmittance for light having a wavelength in the visible region, and the visible information recording layer 7 is visible through the optical recording layer 1.

Reference numeral 12 denotes a heat / magnetic field for additionally writing / rewriting the first visible information, and a thermal head or a magnetic head is generally used. The first visible information is additionally written and rewritten from behind the optical recording surface of the optical card.
Is provided, the content of the first visible information cannot be read from the back side of the optical recording surface.

The structure of the visible information recording layer will be described.
As shown in FIG. 3, the first visible information is information that can be visually recognized through the optical recording layer 1, and is information that can be additionally written or rewritten. As a method of recording information that can be additionally recorded, a method in which a general thermosensitive recording material is used and information is additionally recorded by the heat of a thermal head is simple.

On the other hand, a sheet for displaying rewritable visible information, that is, a rewritable display sheet is for recording rewritable visible information on a sheet, and includes a magnetic powder, a magnetic capsule type, and a thermoreversible type. The magnetic type generally comprises a back coat layer, a magnetic capsule, and a protective layer provided on a substrate. A scale-like magnetic powder is sealed inside the magnetic capsule and has light reflectivity.
By applying a vertical magnetic field to the display section, the magnetic particles are arranged vertically, and the color of the back coat is exposed. On the other hand, when a horizontal magnetic field is applied, the magnetic particles are arranged horizontally and characters are erased.

In the thermoreversible type, a thermosensitive recording layer made of a thermoreversible recording material is adhered on a back coat layer on a substrate, and printing and erasing can be repeatedly performed at a writing temperature and an erasing temperature by a thermal head. You can do it. For example, a thermosensitive material in which an organic low-molecular compound having a particle size of 1 μm or less is uniformly dispersed in a polymer matrix such as a polyvinyl chloride resin is coated on a substrate such as PET, and the crystal of the low-molecular compound depends on the temperature. This is a phase change type in which recording / erasing by transparency / white turbidity is performed by changing the oxidation behavior.
Conventionally, the background color was only the silver color of the aluminum vapor-deposited film, but in recent years, it has become possible to print black, blue and any other colors. In addition, any rewrite display such as a rewrite display using a polymer liquid crystal can be used in the present invention.

In the present invention, these rewritable displays may be provided on the surface of the transparent protective layer 5 of the optical card opposite to the surface facing the optical recording layer 1 in the order of a rewritable display portion and a rear portion, or may be provided by PET. After forming a backside portion and a rewritable display portion on a thin base material such as a film in this order to prepare a rewritable display sheet in advance, the surface on the rewritable display portion side may be attached to a transparent protective layer. Further, after the portion corresponding to the rewrite recording area of the transparent protective layer is cut to form a cavity, the above-described rewrite display sheet may be embedded.

The recording / erasing of rewrite information is performed from the back of the rewrite display, instead of recording / erasing from the rewrite display section (actually, a display section with a protective layer) as in a normal rewrite card. On the other hand, it is necessary to form the base material holding the rear surface portion and the rewritable display layer as thin as possible in order to reduce the display density.

The postscript or rewrite information used in the present invention includes personal information of the cardholder, for example, character information such as transaction information and balance of a name, address, telephone number, reference number, account number, pre-built card, and face information. All kinds of information such as image information such as photographs, fingerprints and pictures, and symbol information such as bar codes can be entered.

Next, the shielding layer 8 will be described. The shielding layer 8 is a layer for preventing the first visible information and the second visible information from interfering with each other. As described above, when the second layer 7b of the visible information recording layer 7 is used as a printing layer, the amount of the pigment mixed is reduced by preventing noise from being mixed into the reproduction signal of the information recorded on the optical recording layer, and from the optical card. 70% by weight or less, preferably 60% by weight to suppress peeling and cracking
% Or less, and the thickness of the second layer 7b is preferably 10 μm or less from the viewpoint of printing accuracy.

However, even in the above case, it may be difficult to completely prevent the transmission of visible light only with the second layer 7b of the visible information recording layer, and the first visible information and the second visible information may not be completely separated. It is possible that they may interfere with each other. For example,
In the optical card shown in FIG. 1, when the second visible information is viewed through the transparent overcoat layer 10 without the shielding layer, the first visible information on the visible information recording layer 7 can be visually recognized. As a result, it is conceivable that the quality of the first visible information and the second visible information deteriorates. With respect to such a problem, by providing a shielding layer 8 between the visible information recording layer 7 and the second visible information layer 9, the transmission of visible light through both visible information layers is prevented, and the first visible information layer is prevented. And the interference with the second visible information can be completely suppressed.

It is preferable that the shielding layer 8 has a low transmittance of visible light, for example, a transmittance of 10% or less for light having a wavelength of 400 to 700 nm. The thickness is preferably 3 to 30 μm so as not to affect the thickness of the optical card. Such a shielding layer 8 is obtained, for example, by using a printing layer. Further, it is preferable to use white or a color close to white so as not to affect the colors of the first visible information and the second visible information.

When the shielding layer 8 is formed of a printing layer, a printing layer containing aluminum powder or aluminum oxide powder can be suitably used. In this case, the content of the powder in the printing layer is 30 to 70 wt%, particularly 30 to 60 wt%, in order to achieve the above-mentioned light transmittance and to suppress the peeling and cracking of the printing layer from the medium. It is preferable that For such a printing layer having a thickness of 3 to 30 μm, for example, an aluminum powder or an aluminum oxide powder is added to the above-mentioned liquid resin for printing ink by 10%.
An addition of about 30 wt% can be formed using a general printing technique. More specifically, for example, a liquid resin containing about 10 to 20% by weight of a polyester resin (trade name:
Sericol EGS, manufactured by Teikoku Ink Mfg. Co., Ltd.) to which 10 to 30 wt% of aluminum powder having an average particle diameter of about 0.1 to 3 μm or aluminum oxide powder having the same particle diameter is added in an amount of 10 to 30 wt%. (For example, screen printing) by coating to a thickness of about 3 to 30 μm, a printing layer which is excellent in visible light impermeability and hardly causes peeling or cracking when bending an optical card, and is preferably used as a shielding layer. can get.

The material of such a shielding layer may exhibit, for example, a reflectance of more than 30% with respect to light in the infrared region, and the first layer 7a and the second layer 7a constituting the visible information recording layer 7 may be provided. 7b is not preferred. However, the optical recording layer 1
When provided on the transparent protective layer 5 via a visible information recording layer in which the reflectance of the surface opposite to the surface is suppressed to 30% or less, noise does not occur in the optical reproduction signal.

The shielding layer 8 may be composed of a plurality of layers, for example, a laminate of printing layers. In this case, transmission of visible light can be suppressed more efficiently. For example, a print layer having a thickness of 5 μm formed of an ink obtained by mixing particles of aluminum or aluminum oxide described above, and a print layer having a thickness of 4 μm formed of a white ink containing titanium oxide which can be used for the second layer 7b of the visible information recording layer. The laminated film with the printing layer is preferably used as the shielding layer 8 because the visible light transmittance can be 10% or less.

Next, the optical recording layer 1 will be described. The optical recording layer 1 transmits visible light within a range that does not substantially affect the recording / reproduction of information by the light beam, and specifically, for example, has a transmittance of visible light of at least 400 to 700 nm that is at least 400 nm. 10% or more, especially 20% or more is suitably used. As the optical recording material constituting such an optical recording layer, a material satisfying the above conditions may be appropriately selected from known optical recording materials, and includes, for example, metals, metal compounds, organic dyes, and organic dyes. A metal or a metal compound is exemplified.

In particular, organic dyes have wavelength dependence in light transmittance as compared with metals and the like, and exhibit excellent absorption of, for example, light in the infrared wavelength range (for example, light having a wavelength of 760 nm or more). Some of them have a property of exhibiting a high transmittance for light in the visible wavelength range, and are preferable as a material for the optical recording layer. When such an organic dye is applied to the optical recording layer, its thickness is generally designed so that the surface reflectance with respect to the light beam becomes substantially maximum. Therefore, an organic dye having visible light transmittance at such a thickness is more preferable.

Examples of such organic dyes include polymethine dyes, anthodiquinone derivatives, cyanine dyes, merocyanine dyes, naphthoquinone dyes, dioxazine compounds, triphenodithiazine compounds, phenanthrene derivatives, phthalocyanine dyes, pyrylium dyes, and croconium dyes. Dyes, azo dyes, azulene, and the like. Among them, especially by using a polymethine dye,
Since characteristics with high recording sensitivity and good durability can be obtained, and the film can be manufactured by wet coating, an optical recording medium that is less expensive than a vacuum film forming method such as an evaporation method or a sputtering method can be manufactured. For example, 1,1,5,5-tetrakis (p-diethylaminophenyl) -2,4-pentadienium perchlorate, which is known as an organic dye for optical recording,
Its thickness is about 90-100nm (900-1000mm)
At the time, the reflectance shows a maximum value of about 12%. The dye film having this thickness has a visible light wavelength range showing a transmittance of 80 to 95%, and is one of the materials suitable for the optical recording layer.

Next, as the transparent substrate 3, a material which is excellent in smoothness, has high transmittance of laser light used for recording and reproduction, and has little optical distortion is preferable. Usually, a plastic sheet or film is used, for example, an acrylic resin, a polyester resin, a polycarbonate resin, a polystyrene resin, a vinyl resin, a polyimide resin,
A polyacetal resin or the like is used, and particularly, an acrylic resin and a polycarbonate resin having good laser light transmittance and low birefringence are preferable.

As the adhesive used for the adhesive layer 4, any adhesive which does not adversely affect the material forming the optical recording portion can be used. For example, a vinyl monomer such as vinyl acetate / ethylene / acrylic acid / acrylamide can be used. Thermoplastic adhesives such as homopolymers and copolymers, polyamides, polyesters, and epoxy resins, and thermosetting resins such as amino resins (urea resins and melamine resins), phenolic resins, epoxy resins, urethane resins, and thermosetting vinyl resins Adhesives, rubber-based adhesives such as natural rubber, nitrile rubber, chloro rubber, silicone rubber and the like can be used. In particular, a hot-melt adhesive, for example, an ethylene-vinyl acetate copolymer or an ethylene-acrylic acid copolymer is preferable because the production process can be simplified.

The transparent protective layer 5 can be used as long as it is excellent in smoothness and has transparency to visible light. However, considering durability, the same material as the transparent substrate 3 or a material having similar physical properties such as thermal expansion coefficient is used. preferable.

The thickness of the transparent substrate 3 and the transparent protective layer 5 through which the light beam passes is, for example, 0.4 for an optical card.
mm ± 0.04 mm, and the total thickness of the transparent substrate 3 and the transparent protective layer 5 that does not allow a light beam to pass therethrough is 0.2 to 0.5 mm with the adhesive layer 4. Is preferred.

As shown in the present embodiment, the visible information recording layer 7 is provided on the surface of the transparent protective layer 5 on the side not facing the optical recording layer 1,
That is, by providing on the outer surface of the transparent protective layer 5, it is possible to effectively prevent the light beam transmitted through the optical recording layer 1 from being reflected on the visible information recording layer and returning to the light beam incident direction again. That is, in the present embodiment, even when visible information is provided, deterioration of the C / N ratio of an optically reproduced signal can be suppressed.

Next, the second visible information layer 9 will be described. The second visible information layer 9 that carries the second visible information,
As described above, the foreground of the second visible information is formed, and the shielding layer 8 forms the background of the second visible information. The second visible information layer can be formed using any general printing ink used for general card printing.

As the printing ink, a commercially available resin solution for an ink to which an appropriate amount of a dye or a pigment is added can be used. Examples of the resin solution for printing ink include a resin solution containing an acrylic resin and an acrylic polyol (trade name: Acrydic, Dainippon Ink and Chemicals, Inc.)
Manufactured), polyisocyanate, polyester polyol,
Resin solution containing alkyd polyol and blocked polyisocyanate (trade name: Pernock, manufactured by Dainippon Ink and Chemicals, Inc.), resin solution containing urethane acrylate, unsaturated polyester and epoxy acrylate (trade names: Unidick, Dainippon Ink) Chemical Industry Co., Ltd.)
Resin solution (trade name: Sericol 13, manufactured by Teikoku Ink Mfg. Co., Ltd., trade name: SS8, manufactured by Toyo Ink Co., Ltd.) containing vinyl chloride and acrylic resin, resin solution containing polyester resin (trade name: Sericol EGS, manufactured by Teikoku Ink Mfg. Co., Ltd.). Among them, an ink appropriately selected in consideration of the quick drying property, the amount of the remaining solvent, the durability of the optical card, and the like can be used. it can.

The thickness of the printing layer is 1 to 1 per layer.
The thickness is preferably 0 μm, particularly preferably 1 to 7 μm in order to improve the printing accuracy. The second visible information layer 9 made of such a printed layer does not peel off from the transparent protective layer 5 even if the optical card is bent, for example, and can prevent the second visible information layer 9 from cracking. .

[0042]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 A dye mixture of 75 parts by weight of a polymethine dye represented by the following structural formula (1) and 25 parts by weight of an aminium salt compound represented by the following structural formula (2) as a heat resistance improving material was used as a dye solvent. The dye coating solution was dissolved in diacetone alcohol as a solvent so as to be 3% by weight.

The above dye coating solution is applied by gravure printing to a 0.4 mm thick polycarbonate substrate on which a repregroove has been formed by the RG method, and dried to a thickness of 1000 mm.
Was formed on the pre-groove surface. On the other surface of the substrate, a hard coat layer made of an acrylic resin was provided in order to improve scratch resistance.

Next, a 0.15 mm thick transparent polycarbonate sheet was prepared as a protective layer, and a 50 μm thick hot melt adhesive (Cranbetter O-4121) was applied to the optical recording surface side of the substrate provided with the optical recording layer. , Kurabo Industries, Ltd.
).

[0046]

Embedded image

Next, a heat-sensitive recording layer was provided as follows on one surface of a PET film having a thickness of 10 μm as a write-once sheet. Preparation of Dye Precursor Dispersion Solution 25 parts by weight of 2- (o-fluoroanilino) -6-diethylaminofluoran, 20 parts by weight of a 25% aqueous solution of polyvinyl alcohol (molecular weight 500), and 55 parts by weight of water were prepared, and a sand grinder was prepared. Average particle size is 1-3 μm
Dispersion miniaturization operation was performed so that

Preparation of Developer Dispersion Solution Bis (3-allyl-4-hydroxyphenyl) sulfone 12 parts by weight Polyvinyl alcohol 25% solution 16 parts by weight Water 72 parts by weight was prepared and dispersed in the same manner as described above.

The dye precursor dispersion, the developer dispersion, and a 50% SBR latex solution as a binder were added at 10: 6.
The mixture was mixed at a ratio of 0:30, and the mixture was applied and dried on PET so that the solid content became 10 g / m ² , thereby providing a heat-sensitive recording layer.

On the other hand, on the other side of the PET film, a UV curable ink (Sericol UV FIL) was used as a back layer.
384 OP-611 white) was applied so as to have a thickness of about 7 μm, and cured by irradiating 80 W / cm ultraviolet rays. The content of the heat-sensitive recording layer could not be confirmed from the back coat surface.

After applying a pressure-sensitive adhesive (LS-1086, Lintec Co., Ltd.) to the surface of the protective layer of the above-mentioned bonded product, the surface of the heat-sensitive recording layer and the protective layer of the PET sheet processed on both sides are combined. After lamination, it was cut into a card size to obtain an optical card having a heat-sensitive recording layer in the optical recording area.

When characters were written from the non-optical recording surface side of the obtained optical card by the heat of a thermal head (120 ° C.), the characters written from the optical recording surface could be read visually.
On the other hand, no visible information characters could be confirmed from the non-optical recording surface of the optical card. By adding card-specific information as additional information, the security of the card has also been improved.

Example 2 In the same manner as in Example 1, the substrate provided with the optical recording layer and the transparent protective layer were bonded via an adhesive.

Next, 50 parts by weight of linoglyceric acid 50 parts by weight of tetracosandioic acid 250 parts by weight of vinyl chloride-vinyl acetate-phosphate ester copolymer (Denka Vinyl # 1000P, manufactured by Denki Kagaku Kogyo KK) di-n-phthalate -A solution composed of 30 parts by weight of heptyl and 1500 parts by weight of tetrahydrofuran is coated on a polyester film (Metal Me, manufactured by Toray Industries, Inc.) having a thickness of about 10 μm on which Al is deposited, by a wire bar, and dried by heating to form a reversible thermosensitive layer of about 5 μm thickness. Created.

Further, a solution consisting of 10 parts by weight of a polyamide resin (CM8000, manufactured by Toray Industries, Inc.) and 90 parts by weight of methyl alcohol was applied by a wire bar and dried by heating to form an intermediate layer having a thickness of about 1 μm.

The obtained reversible thermosensitive layer is cloudy in the initial state, and becomes transparent when heat of about 77 to 90 ° C. is applied.
It remained transparent after cooling. On the other hand, when heat of 95 ° C. or more was applied, the solution became cloudy and maintained cloudy even after cooling.

Next, on the other surface of the polyester film, a UV curable ink (Sericol UV FIL 384) was used.
OP-611 white) was applied to a thickness of about 7 μm, and cured by irradiating 80 W / cm of ultraviolet rays. Further colored UV ink (Sericol UV FIL 38
4 OP-911 black, etc.), card printing was performed as the second visible information.

The surface on which the intermediate layer of the polyester film is provided on the protective layer side of the optical card bonded product via a pressure-sensitive adhesive (Hybon 10-322-2S: manufactured by Hitachi Chemical Co., Ltd.). After lamination, it was cut into a card size to obtain an optical card having a rewrite display in an optical recording area as shown in FIG.

From the printing surface of the obtained optical card, when printing was performed by applying heat (about 90 ° C.) of a thermal head to the surface of the card, the reversible recording layer became transparent and the underlying color appeared, and became character information. Confirmed through the optical recording layer. The added text information could not be confirmed from the printed surface. The surface of the printing surface and the optical recording portion were not affected by the deformation or deterioration of the thermal head due to heat. Further, when heat (approximately 100 ° C.) of a thermal head was applied to the printed surface of the card, the printed portion was erased. Again, there was no effect on the printing surface or the optical recording section.

Example 3 In the same manner as in Example 1, the substrate provided with the optical recording layer and the transparent protective layer were bonded via an adhesive.

Next, microcapsules (particle diameter: about 20 μm) containing magnetic powder (particle diameter: about 5 μm, flakes) made of an iron-nickel alloy using polyvinyl alcohol resin as a binder were bonded on the laminated transparent protective layer. After directly providing a polyester resin layer having a thickness of 10 μm as an anchor layer, a UV ink (Sericol UV FIL38) was used.
4 OP-911 black, etc.), card printing was performed as the second visible information. The bonded product having the visible magnetic recording layer was cut into a card size to obtain an optical card having a magnetic rewrite display in the optical recording area.

[0062]

As described above, according to the present invention, the visible information of additional writing or rewriting is provided on the inner surface of the optical recording layer, so that the visible information of additional writing or rewriting inside the card is displayed on the inner surface of the card. Therefore, the visible information can be made stronger against the friction on the card surface. Further, it is possible to provide an optical card which does not stain the display and is excellent in aesthetics.

Further, since information that can be additionally written and rewritten can be displayed on the optical recording surface, it is possible to add more additional information that can be additionally written and rewritten on one card. For this reason, even in various hybrid cards combined with optical recording, it is possible to add visible information additional / rewrite information without being relatively restricted by the arrangement space. Furthermore, when the visible information is of the write-once type, unique information can be added to the inside of the card, so that an optical card with extremely high security can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a first embodiment of the optical card of the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a schematic sectional view showing another embodiment of the optical card of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Optical recording layer 2 Transparent hard coat layer 3 Transparent substrate 4, 4a Adhesive layer 5 Transparent protective layer, 6 Preformat pattern 7 Visible information recording layer 7a 1st layer which comprises the whole view of 1st visible information 7b 1st visible Second layer forming background of information 8 Shielding layer 9, 9a Second visible information layer 10 Overcoat layer 11 Light beam for recording / reproducing information on optical recording layer 12 Addition / rewriting of first visible information Heat to do
Magnetic field 13 Support for visible information recording layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 7/24 572 G11B 7/24 572J 13/00 13/00 23/40 23/40 A

Claims (8)

[Claims] 1. An optical card having at least a transparent substrate, an optical recording layer, a transparent protective layer, and a visible information recording layer in this order, wherein the visible information recording layer is an optical recording layer from a side irradiated with an optical recording light beam. Can be read visually through
An optical card having a visible information recording layer, wherein the visible information recording layer is formed of a recordable recording medium. 2. A concealing layer is provided on a surface of the visible information recording layer opposite to the transparent protective layer so that the visible information recording layer is not visible from a direction in which a light beam of optical recording is not irradiated,
The optical card according to claim 1, further comprising a second visible information layer on the surface of the concealing layer. 3. The optical card according to claim 1, wherein said visible information recording layer is formed of a rewritable recording medium. 4. The optical card according to claim 1, wherein said visible information recording layer is made of a heat-sensitive material. 5. The optical card according to claim 1, wherein the visible information recording layer is made of a material that can be displayed by magnetism. 6. The optical card according to claim 1, wherein the optical recording layer has a transmittance of 10% or more in a visible light region having a wavelength of 400 to 600 nm. 7. The optical card according to claim 1, wherein the optical recording layer contains a polymethine dye. 8. At least a transparent substrate, an optical recording layer, a transparent protective layer, and a visible information recording layer are provided in this order, and the first visible information passes through the optical recording layer from a side irradiated with a light beam of optical recording. A method for recording visible information on an optical card that is visually readable and has a visible information recording layer formed on a recordable recording medium, wherein the first visible information is recorded on a transparent information recording layer. A visible information recording method for an optical card with a visible information recording layer, wherein the method is performed from the side opposite to the side in contact with the protective layer.