JPH0827994B2 - Light card - Google Patents

Description

The present invention relates to an optical card, and more particularly to a card-shaped information recording carrier for optically recording and reproducing information.

[Prior Art] In recent years, with the progress of informationization in society, as a means for efficiently handling a wide variety of information, an optical disk, an optical card, an optical tape, or another information recording carrier for optically recording or reproducing information, and an optical recording medium. Many information recording / reproducing devices have been proposed. The information record carrier has binarized information with a change in reflectance,
There is a type that can detect changes in reflected light intensity due to changes in surface shape such as the presence or absence of pits (holes) and changes in the polarization plane due to the magneto-optical effect, which can be converted into intensity changes. The above-mentioned information recording carrier has a feature that it has a long recording life because it has a high recording density and can record and reproduce data in a non-contact manner.

Further, a card-shaped information recording carrier (hereinafter, referred to as an optical card), which is excellent in portability and has a large capacity compared to its size, has been actively researched and developed recently, and proposals have started to be made.

Hereinafter, an optical card will be described as an information record carrier for optically recording / reproducing information.

To describe an optical information recording / reproducing method, for example, magneto-optical recording in which the magnetization direction is reversed by an energy beam, recording by forming concave and convex pits, or recording by high or low optical reflectance is performed. A record carrier having a high S / N ratio and an optical reflectance which is easy to manufacture is widely used.

Cards having a recording layer in which silver particles are dispersed in a gelatin matrix have been proposed as record carriers having high and low optical reflectance. Writing of information to the recording layer is performed by irradiating the recording layer with a laser beam to form recording pits.

On the other hand, a so-called heat mode recording material has been proposed in which the recording layer is irradiated with an energy beam such as a laser beam in a spot shape to change the state of a part of the recording layer for recording. As these recording layers, metal thin films such as tellurium and bismuth, organic thin films such as polystyrene and nitrocellulose, dye thin films such as cyanines, and tellurium low oxide films utilizing phase transition are used.
These recording materials are so-called DRAW (Direct Read After Write; direc) that can be "read directly after writing" without the need for development processing after writing information.
t read after write) medium, high density recording is possible and additional writing is possible.

FIG. 3 is a schematic plan view showing a recording format of a conventional DRAW type optical card.

In FIG. 3, a recording area 2 is provided on an optical card 1 which is a record carrier, and the recording area 2 is formed by arranging a plurality of tracks 3. Further, a start bit and a stop bit are formed on the track 3, and the track 3 has an information capacity of about several thousand bits. Also,
Each track 3 is separated by a reference line 5 (hereinafter referred to as R line). The arrow A indicates the moving direction of the optical card 1 during reproduction.

 FIG. 4 is a schematic configuration diagram of an optical card reproducing method.

In FIG. 4, the optical card 1 can be moved in the arrow A direction by the rotating mechanism 6. The information recorded on the optical card 1 is read and reproduced by the optical head 11 for each track 3. First, light from a light source 7 such as a semiconductor laser is condensed by a lens system 8 to illuminate a track 3 on which information is recorded. The image of the illuminated track 3 is formed on the sensor 10 by the image forming optical system 9,
The sensor 10 outputs an electric signal corresponding to the information recorded in.

When the reading of the track 3 is completed, the optical card 1 moves in the direction of arrow A or the optical head 11 moves in the direction of arrangement of the tracks 3 (direction of arrow C), and the information reading of the next track 3 is performed in the same manner. .

To access any track 3 on the optical card 1, the optical head 11 is moved in the direction of arrow C. Optical head
11 counts the R line 5 to select the track 3 to which the target track 3 to be read belongs, and stops when the track 3 is reached. Then, the rotation mechanism 6
The optical card 1 is moved in the direction of arrow A to read the information on the target track 3.

[Problems to be Solved by the Invention] As described above, the information recording carrier such as the conventional optical card 1 is optically driven by the light emitted from the light source 7 provided in the optical head 11 of the optical recording / reproducing apparatus. Information recording or reproduction is performed.

As described above, while the optical card 1 is being tracked during reproduction, the optical card 1 is moved in the direction of arrow A by the rotating mechanism 6 to read information. It was found that the card sometimes stopped due to reversal movement, and writing progressed, though very gradually, due to the energy of the reading light, and finally it became difficult to detect the tracking signal.

The present invention has been made for the purpose of solving the above problems, and it is an object of the present invention to provide an optical card in a DRAW type optical card in which writing by reading light is prevented at the time of inversion stop accompanying movement of the optical card. To do.

[Means for Solving the Problems] That is, according to the present invention, an optical recording layer, a film coating layer and an immobilization layer are provided in this order on the surface having a track groove of a transparent substrate, and the film coating layer is the optical recording layer. Of the recording area on which the optical recording is performed, the surface of the recording area facing the fixing layer is covered, and the position of the recording layer with respect to the optical recording layer is fixed by the fixing layer. An optical card comprising a resin film that does not substantially change the optical recording layer under the condition that optical recording is not performed at the contact interface with the optical recording layer.

 Hereinafter, the present invention will be described in detail.

FIG. 1 is a sectional view showing an embodiment of an optical card according to the present invention, and FIG. 2 is a plan view showing an embodiment of an optical card according to the present invention.

Referring to FIG. 1, an optical card according to the present invention is provided with an optical recording layer 22 on a track groove surface of a transparent substrate 21 having a track groove portion 26 and a recording area portion 28 (second area) of the optical recording layer 22.
(See the drawing) only is coated with the film coating layer 25. Margins 29 where optical recording layers are formed at both ends of the track groove surface
(See FIG. 2), the film coating layer 25 is not formed. The optical card includes an optical recording material 27 thus obtained and a card base material 24, an immobilizing layer 23 made of an adhesive or the like.
It is provided so as to be in contact with each other.

If necessary, the optical card may be provided with a magnetic recording layer, an IC memory, an engraved image, a photograph, characters, marks, and embossed characters called imprint on the front surface or the back surface of the optical card. By doing so, one card can be used for various reproduction systems, and forgery can be prevented more effectively.

As the transparent substrate 21 having the track groove portion 26, one having little inconvenience in optical recording / reproducing is preferable,
Further, it is preferable to use a thermoplastic material having good moldability for forming the track groove. For example, acrylic resin, polyester resin, polycarbonate resin, vinyl resin, polyimide resin, polyacetal resin, polyolefin resin, polyamide resin, cellulose derivative and the like can be used.

When the track groove portion 26 is formed on the substrate, when the substrate is a thermoplastic resin, the stamper mold is thermally transferred by a method such as injection molding or hot press molding at a temperature equal to or higher than the melting point, or a light is transferred onto the substrate. By applying a curable resin composition, bringing the stamper mold into close contact, and irradiating ultraviolet rays or the like to cure the photocurable resin composition by a method known in the art such as a method of optically transferring the stamper mold. It can be carried out.

In the present invention, the track groove of the transparent substrate 21 is preferably formed by the optical transfer method. This is a laminated structure in which the track groove portion 26 (track groove, preformat and track portion) formed by the optical transfer method is not integrated with the substrate. In this case, the substrate and the track groove portion 26 are slightly different in physical properties, and the track portion is made of photo-cured resin, so that it is an extremely thin layer (several μm to several hundreds).
It has been observed that even if it is (μm), the cured resin-like properties tend to be strong. This is almost no problem in an optical information record carrier having a hollow structure such as an optical disk, but in an optical information record carrier having a close-sealing structure such as an optical card, the sensitivity is slightly different. A decline has been observed.

As described above, in an optical card in which the optical recording layer 22 is formed on the transparent substrate with track grooves obtained by the optical transfer method and the card base material 24 is bonded via the fixing layer 23, the thermoplastic resin is It has been observed that recording tends to be slightly difficult as compared with an optical card formed by using a transparent substrate with a track groove formed directly on the transparent substrate by a hot pressing method. However, although it is difficult to perform optical recording on the track portion, the reflected light for tracking can be sufficiently detected by the sensor, so that the track groove portion can be detected. Therefore, the margin portion 29 in the optical card is a preferable mode.

That is, although reflected light can be detected and a tracking signal can be detected, optical recording is somewhat difficult, and it is considered that writing by reproduction light having low energy power is considerably suppressed. Also, in the margin part 29, when the optical head moves to access an arbitrary track and the target track is selected and stopped, the writing by the reproduction light is performed in the same way as when the optical card is reversed. It happens, but it can be suppressed.

In the case of an optical card, the groove width of the track groove portion 26 is usually 2 to 4 μm, and the track pitch is 8 μm to 15 μm.

The depth of the groove is preferably an odd multiple of λ / 4n (or λ / 8n) for tracking signal detection, where λ is the wavelength of the light source used and n is the refractive index of the transparent substrate. In consideration of the reproducibility of the moldability of the groove, it may be difficult to detect the reflected light amount due to the interference effect of only the phase component.In such a case, the reflected light amount is also detected by considering the intensity change of the amplitude component. In some cases, the theoretical depth of the groove may be changed in order to control the temperature, so it cannot be specified.

When the optical recording layer 22 is formed in the track groove portion 26,
Improved adhesion, improved optical characteristics (transmittance and reflectance), improved sealing performance against gas emission from the substrate, improved stability of the optical recording layer (for example, thermal conduction to prevent deterioration due to reproducing light) For the purpose of improving the properties, etc.), primer treatment, formation of an undercoat layer, corona treatment, UV-ozone treatment, plasma treatment or the like may be performed.

As the card base material 24, any material that can be used as an ordinary card base material can be used, and specifically, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer,
Acrylic polymers such as polyvinylidene chloride and polymethylmethacrylate, polystyrene, polyvinyl butyral, acetyl cellulose, styrene / butadiene copolymers, polyethylene, polypropylene and polycarbonate are used. Depending on the case, a metal sheet of iron, stainless steel, aluminum, tin, copper, zinc or the like, synthetic paper, paper or the like can be used. Furthermore, a laminate of the above materials can also be used. If necessary, these card base materials 24 may be subjected to a pretreatment such as corona discharge treatment, plasma treatment, or primer treatment for improving the adhesiveness.

As the optical recording layer 22, when the wavelength of the reproducing energy beam is 650 nm or more, particularly 700 to 900 nm, it is preferable that the difference between the reflectance in the bit as the recording portion and that in the unrecorded portion is large. . Further, it is preferable that the energy required for changing the reflectance due to the irradiation of the energy beam for recording is small. Further, it is preferable that the reflectance of the recorded portion and the unrecorded portion does not change due to the reproducing energy beam. For example, oxides of Te, Sb, Mo, Ge, V, Sn and the like, compounds of Te-Sn, TeOx-Ge and the like undergo a phase transition upon irradiation with an energy beam, and the reflectance changes. _{Furthermore, Te-CH 4, Te-} CS 2, Te- styrene, Sn-SO _2, GeS
A composite of a metal such as —Sn or SnS—S and an organic compound or an inorganic sulfide, or a multilayer film such as SiO ₂ / Ti / SiO ₂ / Al can also be used. Further, it is also possible to use a material in which metal particles such as silver are dispersed in a thermoplastic resin such as nitrocellulose, polystyrene or polyethylene, or a material in which metal particles are agglomerated on the surface of this thermoplastic resin. Moreover, a chalcogen or coloring type of _{MoO 3 -Cu, MoO 3 -Sn-} Cu , etc. is also used, depending on the case, but can be used also multilayers of organic thin film and the metal thin foam-forming, In the present invention, the optical recording layer 22 is preferably an organic thin film whose optical properties can be changed by an energy beam. For example, anthraquinone derivatives, particularly those having an indusulene skeleton, dioxazine compounds and their derivatives, triphenodithiazine compounds,
Phenanthrene derivatives, cyanine compounds, merocyanine compounds, pyrylium compounds, xanthene compounds, triphenylmethane compounds, croconium dyes, crocones, azines, azo dyes, indigoids, methine compounds, polymethine compounds, azulene compounds , Dyes such as squalium derivatives, sulfur dyes and dithiolate complexes can be mentioned, and these are preferable for the present invention because continuous production by solution coating is possible.

Further, it may be a dye composition in which these dyes are mixed with a quencher having a function of quenching excited species of these dyes. For example, the quencher is selected from the following, taking into consideration the compatibility with the dye and the solvent. The addition amount can be several wt% to 50 wt% with respect to the dye, but if it is too small, the effect as a quencher is hardly seen, and if it exceeds 50 wt%, the absolute amount of the heat mode recording material is increased. A decrease in sensitivity is observed from the decrease in. Therefore, it is preferably 10 to 40% by weight with respect to the dye.
In particular, 20 to 30% by weight is effective without deterioration of sensitivity.

Such quenchers include various metal chelate compounds, especially polydentate ligands having Zn, Cu, Ni, Cr, Co, Mn, Pd, Zr as a central metal, such as N ₄ , N ₂ O ₂ and N ₂ S. Tetradentate ligands such as ₂ , S ₄ , O ₂ S ₂ and O ₄ , or tridentate ligands such as N ₂ O, NO ₂ , NS ₂ , O ₃ and NOS and other ligands such as water. , Ammonia, halogen, phosphine, amine, arsine, olefin, etc., or tetracoordinated type of two bidentate ligands N ₂ , NO, O ₂ and S ₂ , as well as a biscyclopentadienyl ligand, Cyclopentadienyltripyriminium ligand system, or various other aromatic amines and diamines, nitrogen-containing aromatic compounds and their onium salts such as aminium salts, diimonium salts and pyridinium. Examples thereof include salts, imidazolinium salts, quinolinium salts and the like. Further, a pyrylium salt which is an oxygen-containing aromatic salt may be used. It is also possible to use a plurality of these quenchers in combination, and the coating properties of the dye composition,
The composition ratio can be appropriately changed in consideration of stability of the coating film, optical characteristics (reflectance and transmittance), recording sensitivity and the like.

Optical recording layer comprising the above organic dye or dye composition
22 is formed by a known coating method. For example, dip coating, spray coating, spinner coating, bar coating, blade coating, roll coating, curtain coating and the like can be mentioned. The thickness of the optical recording layer 22 is generally about 500 to 2000Å, preferably about 1000Å. Especially in terms of recording sensitivity, the thickness is thin, and S /
From the viewpoint of N ratio, a thicker film is preferable, and the optimum film thickness differs depending on the type of dye.

The film coating layer 25 in the present invention is a resin film, and at the contact interface with the optical recording layer 22,
A material that does not substantially change in the optical recording layer 22 and at least in the unrecorded state is required, and the influence of the adhesive used for the fixing layer on the optical recording layer is prevented, and recording is performed. At times, it is desirable that the material be easily deformed by the thermal energy considered to be generated by the photothermal conversion of the irradiation energy of the optical recording layer. In this respect, the thermoplastic resin thin film is preferable as the film coating layer 25. For example, acrylic resin, polyester resin, polycarbonate resin, vinyl resin, polysulfone resin, polyimide resin, polyacetal resin, polyolefin resin, polyamide resin, vinylidene resin, cellulose derivative or vinyl chloride-acetic acid which is a copolymer thereof. Vinyl copolymer, ethylene-vinyl acetate copolymer, ethylene-
Examples thereof include acrylic acid ester copolymers, vinyl acetate-acrylic acid ester copolymers, styrene-butadiene copolymers, and the like.

These resin thin films are easily available in the form of a film and have a uniform thickness of several μm. In particular, the smoothness of the surface affects the recording characteristics of the optical recording layer 22 of the optical record carrier. If the smoothness is poor, the S / N ratio is poor and it becomes difficult to detect a sufficient signal. Further, when a signal is detected by a change in transmittance, it is desirable that the reproduction light used is transparent. When the signal is detected by the reflectance change, there is no limitation on the reproduction light used.

Although the thickness of the film coating layer varies depending on the material used, it is usually 0.05 to 100 μm, preferably 0.1 to 50 μm.

When the immobilization layer 23 is coated on the film coating layer 25, only one surface of the resin thin film constituting the film coating layer 25 is modified in order to improve the adhesiveness or the adhesiveness at the interface between the two layers. You may do what you want to do. Also, film coating layer
As 25, a resin thin film with an adhesive layer also serving as an immobilization layer may be used. In any case, at the contact interface between the optical recording layer 22 and the film coating layer 25, a resin thin film that does not substantially obstruct the optical recording layer in the unrecorded state is required.

The immobilization layer 23 is used for the purpose of immobilizing the film coating layer 25 described above and for the purpose of bonding with the card substrate 24. In the present invention, a thermoplastic adhesive whose softening temperature or melting point is lower than that of the resin thin film of the film coating layer 25 can be used. As a result, the immobilization layer 23 that covers the margin portion 29 of the optical recording layer 22 and the recording area portion 28 where the film coating layer 25 is provided is formed without affecting only the margin portion 29 of the optical recording layer 22. . As such an adhesive, a polyester-based material, preferably a vinyl-based copolymer, for example, vinyl chloride-vinyl acetate copolymer,
Examples thereof include ethylene-vinyl acetate copolymers, ethylene-acrylic acid ester copolymers, vinyl acetate-acrylic acid ester copolymers, styrene-butadiene copolymers and modified resins thereof.

In particular, it is also possible to bond the film coating layer 25 aligned and arranged on the base material in which the immobilization layer 23 is applied to the card base material 24 in advance, and to bond it to the transparent substrate with the optical recording layer 22, Optical cards can be easily manufactured.

Next, a method of manufacturing the optical card according to the present invention will be described.

First, a track groove is formed on a transparent substrate 21 such as an acrylic resin or a polycarbonate resin by a hot pressing method or an optical transfer method (2P process). What can be used in the known 2P process is commercially available as a photocurable resin composition. Some mainly contain (meth) acrylates and various monofunctional or monofunctional monomers, oligomers, polymers, and other various additives as required.

For example, an organic solvent to control the viscosity during film formation (often the monofunctional or polyfunctional monomer described above also serves as the solvent),
Non-reactive oligomers and polymers to control film flexibility and hardness, UV sensitizers and polymerization initiators to initiate curing,
In addition, a composition containing a filler, a coupling agent (such as a silane-based or titanium-based agent) for improving adhesiveness, and a radical inhibitor for stabilizing storage is used. In any case, as long as it does not lose the translucency after molding and the difference in the refractive index with the transparent substrate is within 0.05, the adhesiveness with the substrate is good and the releasability from the stamper type is good. Things are needed.

The 2P process is called a photo-polymer process. After applying the above-mentioned photocurable resin composition on a transparent substrate, a stamper mold is adhered and energy such as ultraviolet rays is applied from the substrate side. The stamper mold is transferred by curing the resin composition. In the stamper type, track grooves, preformats, track portions, etc. are formed in a desired shape as an uneven pattern.

Next, the optical recording layer 22 is first formed on the track groove surface. A solution containing a dye or a dye composition is applied and dried to form an optical recording layer with a desired thickness. The optical recording layer 22 is formed on the track groove portion 26 including the margin portion 25.

The film covering layer 25 has a size corresponding to the recording area portion 28.
The resin thin films to be the above are aligned and stacked, and the thermoplastic resin adhesive is sandwiched in the gap between the film coating layer 25 and the card base material 24 and stacked, and by a heat fixing roll heated to about 90 to 150 ° C. An optical card can be manufactured by crimping.

In some cases, the DRAW type optical card manufactured as described above may be provided with a hard coat layer for preventing scratches on the transparent substrate 21. Alternatively, it is also possible to form an ultraviolet absorbing film on the transparent substrate 21 in order to increase the light resistance. Alternatively, when the transparent substrate itself is a resin containing an ultraviolet absorber, light resistance and durability can be increased simply by providing a hard coat layer, which is a preferable configuration.

[Operation] As described above, in the conventional optical card (contact sealing structure) using the transparent substrate on which the track groove portion 26 is formed by the optical transfer method using the photocurable resin, the curable resin is used. It has been observed that the optical recording becomes slightly difficult when the optical recording layer 22 is formed on the track groove surface on which the track groove portion 26 made of is formed. However, the optical card of the present invention is a transparent substrate for the optical recording layer 22. It is considered that by providing the film coating layer 25 on the side other than the side, the characteristics of optical recording are slightly recovered and recording becomes easier.

This is considered to be due to the formation of a microscopic space layer between the optical recording layer 22 and the film coating layer 25, which is different from the conventional optical card in that it does not have a complete close contact sealing structure, and has a pseudo hollow structure. It is considered to have a card structure. Therefore,
It is considered that the structure is close to that of an optical disk and the sensitivity of optical recording is improved in the recording area portion 28 provided with the film coating layer 25.

With such a configuration, the margin portion 29 and the recording area portion 28 are separately painted, and the margin portion 29
In 29, an embodiment is conceivable in which writing by reproduction light is prevented, a tracking signal is detected, and the original optical recording is possible in the recording area section 28. It is considered that problems such as disorder of optical characteristics occur at the edge portion of the recoating.

On the other hand, according to the present invention, the optical recording layer 22 is in the same plane in the margin portion 29 and the recording area portion 28 and is uniform in characteristics, and the recording area portion 28 having the film coating layer 25 is applied.
Only this is the mode in which the improvement in sensitivity is restored. Therefore, there is an advantage that the manufacturing process is extremely simplified as compared with the case of separately coating.

[Examples] Next, examples of the present invention will be described, but the present invention is not limited thereto.

Example 1 Neopentyl glycol diacrylate (70 parts by weight) was placed on a transparent resin substrate (vertical 75 mm, width 90 mm, thickness 0.4 mm, ultraviolet absorbent-containing polycarbonate plate, Panlite 211, Teijin Chemicals Ltd.). , A bisphenol epoxy acrylate (30 parts by weight) [bifunctional acrylate obtained by adding acrylic acid to Epicoat 828 (trade name, manufactured by Yuka Shell Epoxy Co., Ltd.]] and benzoin isopropyl ether (1 part by weight) Using a resin mixture
The track groove was formed by the 2P molding method. Track groove 3μ
m, the track groove pitch was 13 μm, and the track depth was 1300 Å.

The optical card substrate was dried at 120 ° C. for 3 HR to remove residual monomers and complete polymerization, and as an undercoat layer, Colcoat 103X (produced by Colcoat Co., Ltd.) was applied by a spin coating method at 50 ° C. for 3 HR. It was dried to form a 500Å thin silica film. On the undercoat layer, a solution of the dye of formula (I) shown below in dichloroethane dissolved at a concentration of 1.6 wt% was applied by a spin coating method to form an optical recording layer having a thickness of 1000Å.

5 μm thick polyethylene terephthalate [Hostaphane RE-5, Hoechst Co., Ltd.] with a size equivalent to the recording area (35 mm in the lateral direction, 40 mm in the longitudinal direction)
[Made] on the optical recording layer, and a thermoplastic adhesive (Evaflex dry film) with a thickness of 50 μm is further laminated,
A 0.3 mm thick polycarbonate plate was placed as a card base material and thermocompression-bonded with a heat roll having a surface temperature of 110 ° C. to prepare an optical card.

Next, using a semiconductor laser light having a wavelength of 830 nm from the transparent substrate side of the optical card, the power of the laser light was 3.9 mW, the spot diameter was 4.5 μmφ, the laser pulse width was 80 μs, and the recording speed was 60 mm / s. A contrast ratio of 0.57 was obtained in the recording area.

On the other hand, the contrast ratio in the margin portion was 0.2 or less, and almost the low recording contrast ratio was obtained. However, the contrast ratio represents the ratio of the reflectance of the non-recording portion to the value obtained by subtracting the reflectance of the recording portion from the reflectance of the non-recording portion.

This optical card has a card feed speed of 60 mm / s and a reproduction optical power.
Under the condition of 0.4 mW, after repeatedly reproducing on one recorded track, even after 30,000 reciprocations, no deterioration was found in the tracking signal in the margin part. In order to select a track for track access, the optical head was reciprocated 10,000 times in the lateral direction of the optical card at a speed of 30 mm / s, but writing by the reproduction light in the margin part could not be detected. It was

[Effects of the Invention] As described above, in the optical card of the present invention, the optical recording layer is formed by providing the film coating layer only on the recording area with respect to the optical recording layer on the track groove surface of the transparent substrate. It is now possible to easily create an optical card that prevents writing by reproduction light in the margin portion, and suppresses tracking error due to inversion stop of the optical card and tracking error due to stop during track selection due to track access.

In particular, when the track groove is created by stamper type optical transfer molding by the 2P process, the recording sensitivity is recovered in the part where the film coating layer is provided on the optical recording layer, and the recording is not performed in the uninstalled part. Since the sensitivity is lowered, the present invention is applicable to an optical information recording carrier that requires a margin portion (however, an area for tracking and autofocus control) other than the recording area portion such as an optical card. It is now possible to record and play back cards with a simple configuration.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an optical card according to the present invention, FIG. 2 is a plan view showing an embodiment of an optical card according to the present invention, and FIG. 3 is a recording of a conventional DRAW type optical card. FIG. 4 is a schematic plan view showing a format and FIG. 4 is a schematic configuration diagram of an optical card reproducing method. 21 …… Transparent substrate 22 …… Optical recording layer 23 …… Fixing layer 24 …… Card substrate 25 …… Film coating layer 26 …… Track groove 27 …… Optical recording material 28 …… Recording area 29 …… Margin part

Claims (3)

[Claims] 1. A transparent substrate having an optical recording layer, a film coating layer, and an immobilizing layer in this order on a surface having a track groove, the film coating layer being an optical recording layer and a recording area in which optical recording is performed. The surface opposite to the immobilizing layer is covered, and the position with respect to the optical recording layer is fixed by the immobilizing layer, and the film covering layer is used for the optical recording at a contact interface with the optical recording layer. An optical card comprising a resin film that does not substantially change the optical recording layer when no optical recording is performed on the layer. 2. The transparent substrate, wherein the transparent substrate is formed by forming a photocurable transfer product of a photopolymerizable resin composition obtained by stamper type optical transfer having a desired preformat on the transparent substrate. The optical card according to claim 1. 3. The optical card according to claim 1, further comprising a card substrate on the surface of the fixing layer opposite to the side facing the optical recording layer.