JPS63209041A - Optical card - Google Patents

Abstract

PURPOSE:To prevent writing by reading out light while an optical card is turned over and stopped after movement by coating the recording region part of an optical recording layer with a film coating layer, laminating an immobilized layer further thereon and immobilizing the film coating layer to the recording region part of the optical recording layer. CONSTITUTION:The optical recording layer 22 is provided on the track groove surface of a transparent substrate 21 having the track groove part 26 and only the recording region part 28 of the optical recording layer 22 is coated with the film coating layer 25 consisting of a thin resin film. An optical recording material 27 obtd. in such a manner and a card base material 24 are adhered via the immobilized layer 23 consisting of an adhesive agent, etc. Writing by reproduction light in a margin part 29 where the optical recording layer is formed is thereby suppressed and the optical card which suppresses the tracking error by the turn over and stop of the optical card and the tracking error by the stop at the time of track selection by track access is easily formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] 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 1] In recent years, as society has become increasingly information-oriented, information recording carriers and optical media such as optical discs, optical carts, and optical tapes that record or reproduce information optically have become a means of efficiently handling a wide variety of information. Many information recording and reproducing devices have been proposed. Binarized information is stored on the information recording carrier by changes in reflectance, changes in reflected light intensity due to changes in surface shape such as the presence or absence of pits, and changes in the plane of polarization due to magneto-optic effects. There are some methods that can be detected by converting the change into an intensity change. The above-mentioned information recording carrier has excellent features such as a high recording density and a long lifespan because it allows non-contact recording and reproduction.

A card-shaped information recording carrier (hereinafter referred to as an optical card) is highly portable and has a large capacity compared to its size.
Recently, there has been a lot of research and development, and proposals have begun to be made.

Hereinafter, an optical card will be explained as an information recording carrier that optically records and reproduces information.

Regarding optical information recording and reproducing methods, for example, magneto-optical recording involves reversing the direction of magnetization using an energy beam, recording by forming concave and convex bits, or recording by increasing or decreasing optical reflectance. , record carriers with high and low optical reflectance, which have a high signal-to-noise ratio and are easy to manufacture, are widely used.

As a record carrier depending on the optical reflectance, for example,
Cards have been proposed that have a recording layer made of silver particles dispersed in a gelatin matrix. Information is written to the recording layer by irradiating the recording layer with a laser beam to form recording bits.

On the other hand again. A so-called heat mode recording material has been proposed in which a recording layer is irradiated with a spot-like energy beam such as a laser beam to change the state of a portion of the recording layer. As these recording layers, metal thin films such as tellurium and bismuth, organic thin films such as polystyrene and nitrocellulose, pigment thin films such as cyanines, and tellurium low oxide films utilizing phase transition are used. These recording materials require so-called DRAJ (direct read after write) technology, which does not require any development processing after information is written, and can be read directly after writing.
) media, capable of high-density recording and additional writing.

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

In FIG. 3, a recording area 2 is provided on an optical cart 1 which is a recording medium, and the recording area 2 is formed by a plurality of tracks 3 arranged thereon. Furthermore, a start bit, a stop bit, etc. are formed on track 3, and track 3
has an information capacity of about several thousand bits. Further, each track 3 is separated by a reference line 5 (hereinafter referred to as an R line). Note that arrow A is the direction of movement of the optical card l during playback.

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

In FIG. 4, the optical card 1 is movable in the direction of arrow A by a rotating mechanism 6. As shown in FIG. Information recorded on the optical card 1 is read and reproduced by the optical card 11 for each track 3. First, light from a light source 7 such as a semiconductor laser is focused by a lens system 8 and illuminates the track 3 on which information is recorded. The image of the illuminated track 3 is formed on the sensor 10 by the imaging optical system 9, and an electric signal corresponding to the information recorded on the track 3 is sent to the sensor 1.
Output from 0.

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

Further, in order to access any track 3 on the optical card l, the optical head 11 is moved in the direction of arrow C. The optical head 11 selects the track 3 to which the target track 3 to be read belongs by counting the R lines 5,
When it reaches track 3, it stops. Subsequently, the optical cart 1 is moved in the direction of the arrow by the one-rotation mechanism 6, and information on the target track 3 is read.

[Problems to be Solved by the Invention] As described above, the information recording carrier such as the conventional optical cart 1 is optically illuminated by the light emitted from the light source 7 disposed in the optical head 11 of the optical recording/reproducing device. Information is recorded or reproduced.

As mentioned above, while the optical cart is being tracked during playback, the optical card l is moved in the direction of the arrow by the rotation mechanism 6 to read information. It has been found that there are times when the card stops due to the reverse movement, and the writing progresses very gradually due to the energy of the read light, eventually making it difficult to detect the tracking signal.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an optical cart that prevents writing by read light when the optical card stops reversing due to movement of the optical card in a DRAW type optical card. It is something to do.

[Means for solving the problems] That is, 1 the present invention provides an optical recording layer on the track groove portion of a transparent substrate having a track groove, covers the recording area portion of the optical recording layer with a film coating layer, and further comprises: This optical card is characterized in that a fixing layer is laminated thereon, and a film coating layer is fixed to the recording area portion of the optical recording layer.

The present invention will be explained in detail below.

FIG. 1 is a cross-sectional view showing one embodiment of the optical cart according to the present invention, and FIG. 2 is a plan view showing one embodiment of the optical cart according to the present invention.

In FIG. 1, the optical card according to the present invention includes an optical recording layer 22 provided on the entire track surface of a transparent substrate 21 having a track groove 26, and a recording area portion 2 of the optical recording layer 22.
8 (see FIG. 2) is coated with a film coating layer 25. The film coating layer 25 is not formed in the margin portion 29 (see FIG. 2) where the optical recording layer is formed at both ends of the track groove surface.

The optical cart is constructed by providing the optical recording material 27 obtained in this way and a cart base material 24 so as to be in contact with each other via a fixing layer 23 made of an adhesive or the like.

If necessary, the optical cart may be provided with a magnetic recording layer, IC memory, engraved images, photographs, characters, marks, embossed characters called imprints, etc. on the front or back side of the optical cart. As a result, one cart can support various playback methods, and counterfeiting can be more effectively prevented.

The transparent substrate 21 having the track grooves 26 is preferably one that has few inconveniences in optical recording and reproduction, and is preferably made of thermoplastic material that has good moldability for forming track grooves. For example, acrylic resin, Polyester resin, polycarbonate resin, vinyl resin, polyimide resin, polyacetal resin, polyolefin resin, polyamide resin, cellulose derivative, etc. can be used.

To form the track grooves 26 on the substrate, if the substrate is made of thermoplastic resin, a method of thermally transferring a stamper mold by injection molding or hot press molding at a temperature higher than the melting point, or a method of thermally transferring a stamper mold onto the substrate using a method such as injection molding or hot press molding at a temperature higher than the melting point is used. Apply a curable resin composition and attach the stamper mold.

This can be carried out by conventionally known methods such as phototransferring a stamper mold by curing the photocurable resin composition by irradiating it with ultraviolet rays or the like.

In the present invention, it is preferable to form the track grooves on the transparent substrate 21 by an optical transfer method. This is because the track groove portions 26 (track grooves, preformat, and track portions) formed by the optical transfer method are It is not integrated with the substrate, but is a laminated structure. In this case, the substrate and the track groove portion 26 have slightly different physical properties, and since the track portion is made of photocured resin, an extremely thin layer (from a few degrees to 91 mm) is required.
004m), it has been observed that there is a tendency for strong cured resin characteristics to appear. This is almost no problem for optical information recording carriers with a hollow structure such as optical disks, but in optical information recording carriers with a close-contact structure such as optical carts, the sensitivity may be slightly lowered. A decline has been observed.

In this way, in an optical card in which an optical recording layer 22 is formed on a transparent substrate with track grooves obtained by an optical transfer method, and a card base material 24 is bonded via a fixing layer 23, thermoplastic Compared to optical carts made using transparent substrates with track grooves molded directly onto transparent substrates by heat press method,
Some trends have been observed that are difficult to record. However, although it is difficult to carry out optical recording in the track portion, since the reflected light for tracking can be sufficiently detected by a sensor, it is possible to detect the track groove portion. Therefore, this is a preferable embodiment for the margin portion 29 in an optical card.

In other words, while reflected light can be detected and tracking signals can be detected, optical recording is somewhat difficult, so energy,
It is thought that writing by low-power reproduction light is also considerably suppressed. Also, when the optical head moves to access a desired track in the margin area 29 and stops after selecting the desired track, writing is performed using the reproducing light in the same way as when the optical card is reversed and stopped. occurs, but this can also be suppressed.

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

In addition, the depth of the groove is preferably set to an odd number multiple of the wavelength of the light source used for tracking signal detection.Taking into consideration the reproducibility of the moldability of the groove, the amount of reflected light due to the interference effect of only one phase component. In such cases, the theoretical depth of the groove may be changed in order to control the detection of the amount of reflected light by taking into account changes in the intensity of the amplitude component. Can not.

In addition, when forming the optical recording layer 22 in the track groove portion 26, it is possible to improve adhesiveness, improve optical properties (transmittance and reflectance),
Primer treatment and undercoat layers are used for purposes such as improving sealing performance against gas release from the substrate and improving the stability of the optical recording layer (for example, improving thermal conductivity to prevent deterioration due to reproduction light). Formation, corona treatment, UV-ozone treatment, plasma treatment, etc. may also be applied.

As the card base material 24, any material that can be used as a normal card base material can be used, and specifically, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer,
Acrylic polymers such as polyvinylidene chloride and polymethyl methacrylate, polystyrene, polyvinyl butyral, acetyl cellulose, styrene/butadiene copolymers, polyethylene, polypropylene, and polycarbonate are used. Depending on the case, metal sheets of iron, stainless steel, aluminum, tin, copper, zinc, etc., synthetic paper, paper, etc. may also be used. Furthermore, a laminate of the materials mentioned above may also be used. These card base materials 24 may be subjected to pretreatment to improve adhesion, such as corona discharge treatment, plasma treatment, and primer treatment, as necessary.

When the wavelength of the energy beam for reproduction is 650 rv or more, particularly 700 to 900 rv, the optical recording layer 22 preferably has a material that has a large difference in reflectance between the bits in the recorded area and that in the unrecorded area. , It is also preferable that the energy required to cause a change in reflectance by irradiation with the energy beam for recording is small.
It is preferable that the reflectance of the recorded and unrecorded areas does not change due to the reproduction energy beam. For example, Te,
Sb.

Oxides such as Mo, Ge, V, Sn, Te-3
Compounds such as n, TeOx-Ge, etc. undergo a phase transition when irradiated with an energy beam, and their reflectance changes. Also, τe−C1,.

Te-C5, Te-styrene, 5n-30, Ga
Composites of metals such as 5-8n and 5nS-8 and organic compounds or inorganic sulfides, SiO/Ti/SiO/
A multilayer film such as ^p can also be used. Further, it is also possible to use a thermoplastic resin such as nitrocellulose, polystyrene, or polyethylene in which metal particles such as silver are dispersed, or a thermoplastic resin in which metal particles are aggregated on the surface. In addition, Carpgen or coloring type 1lo
O, -Cu, 1ions-3n-Cu, etc. can also be used, and depending on the case, a multilayer body of a bubble-forming organic thin film and a metal thin film can also be used, but 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, an anthraquinone derivative,
In particular, substances having an indathrene skeleton, dioxazine compounds and derivatives thereof, triphuedithiazine compounds, and phenanthrene derivatives.

Cyanine compounds, merocyanine compounds, biryllium compounds, xanthine compounds, triphenylmethane compounds, croconium dyes, crocones, azines, azo dyes, indigoids, methine compounds, polymethine compounds, azulene compounds, squalium derivatives , dyes such as sulfur dyes and dithiolate complexes,
These are preferable for the present invention because they can be manufactured continuously by solution coating.

In addition, a dye composition may be used in which these dyes are mixed with a quencher that has the function of quenching the excited species of these dyes. Select by considering compatibility with.

The amount added can range from several weight percent to 50 weight percent per dye, but if it is small, the effect as a quencher will not be seen much, and if it is added in excess of 50 weight percent, the absolute amount of heat mote recording material will be reduced. A decrease in sensitivity is observed from the decrease in . Therefore, 10% to 40% by weight is preferable based on the dye, and particularly 20 to 30% by weight is effective without causing deterioration in sensitivity.

Such quenchers include various metal chelate compounds, especially Zn, Cu, Ni, Cr, Co, Mn, P.
d, polydentate ligands with Zr as the central metal, such as N4.
Concave ligands such as N*Ox, NiS*-34,02St, 04, or s, o, Not.

? ISt, 0:l, a royal ligand such as NOS and other ligands 2, such as water, ammonia, halogen, phosphine, amine, arsine, olefin, etc., or two bidentate ligands N2. In addition to the four-coordinate type of NO,02+ s2, biscyclopentadienyl ligand, cyclopentadienyl-
Various aromatic amines and diamines, nitrogen-containing aromatics, and their onium salts 1, such as aminium salts, diimonium salts, pyridinium salts, imidazolinium salts, in addition to tripyrinium ligand systems or combinations of the above, etc.
Examples include quinolinium salts. Furthermore, biryllium salts, which are oxygen-containing aromatic salts, etc. may be used, and it is also possible to use a combination of two or more of these quenchers. The composition ratio can be changed as appropriate by taking into account factors such as reflectance and transmittance), recording sensitivity, etc.

The above organic pigments or dyes! The optical recording layer 2z made of the Il composition can be formed by a known coating method, such as dip coating, spray coating, spinner coating, bar code coating, plate coating, roll coating, curtain coating, and the like. The thickness of the optical recording layer 22 is approximately SOO to 2000 mm, preferably around 1000 mm.

In particular, from the viewpoint of recording sensitivity, it is desirable that the film be thin, but from the viewpoint of S/N ratio during reproduction, it is desirable that it be thicker, and the optimum film thickness differs depending on the type of dye.

The film coating layer 25 in the present invention is a resin S film, and at the contact interface with the optical recording layer 22, there is a substantial contact with the optical recording layer 22, at least in an unrecorded state. It is necessary to use a material that does not cause changes, to prevent the influence of the adhesive used for the fixing layer on the optical recording layer, and to prevent the influence of the adhesive used in the fixing layer on the optical recording layer. It is desirable that the material be easily deformed by possible thermal energy. In this respect, the thermoplastic resin RJI8t 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 a copolymer thereof, such as vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, ethylene- Examples include acrylic ester copolymers, vinyl acetate-acrylic ester copolymers, and styrene-butadiene copolymers.

These resin thin films are easily available in film form and have a uniform thickness, but the smoothness of their surface in particular affects the recording characteristics of the optical recording layer 22 of the optical record carrier. . If the smoothness is poor, the S/N ratio will be poor and sufficient signal detection will be difficult.

Further, when detecting a signal by a change in transmittance, it is desirable that the material be transparent to the reproduction light used.

When detecting a signal based on a change in reflectance, there are no limitations on the reproduction light used.

The thickness of the film coating layer varies depending on the material used, but
It is usually 0.05 to 100 mm, preferably 0.1 to 50 mm.

In addition, when covering the film coating layer 25 with the immobilization layer 23, the surface of the resin thin film constituting the film coating layer 25 is modified only on one side in order to improve the adhesion and adhesion of the interface between both layers. Alternatively, a resin thin film with an adhesive adhesive layer that also serves as a fixing layer may be used as the film coating layer 25. In any case, the optical recording layer 22 and the film coating layer 25 may be At the contact interface, it is necessary that the resin thin film does not substantially inhibit the optical recording layer in the unrecorded state.

In the present invention, the fixing layer 2 is used for the purpose of fixing the film coating layer 25 described above and for bonding with the card base material 24.
A thermoplastic adhesive having a softening temperature or melting point lower than that of the resin thin film in No. 5 can be used.

As a result, the immobilized IJ 23 is configured to cover the margin portion 29 of the optical recording layer 22 and the recording area portion 28 provided with the film coating layer 25 without invading only the margin portion 2g of the optical recording layer 22. Such an adhesive is preferably made of a polyester-based or vinyl-based copolymer, such as vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester copolymer, acetic acid ester copolymer, etc. Examples include vinyl-acrylic ester copolymers, styrene-butadiene copolymers, and modified resins thereof.

In particular, the film coating layer 25 is applied to the card base material 24 in advance.
It is also possible to bond a transparent substrate provided with an optical recording layer 22 to a substrate provided with a fixing layer 23 in alignment with the substrate, and an optical card can be easily manufactured.

Next, a method for manufacturing an optical card according to the present invention will be explained.

First, track grooves are formed on a transparent substrate 21 made of acrylic resin, polycarbonate resin, etc. by heat pressing method or optical transfer method (2P
process), etc. Photocurable resin compositions that can be used in the known 2P process are commercially available. Some of them are mainly composed of (meth)acrylate, and contain various monofunctional or polyfunctional additives, oligomers, polymers, and other additives as necessary.

For example, organic solvents to control viscosity during film formation (the monofunctional or polyfunctional molecules mentioned above are often used), non-reactive oligomers and polymers to control the flexibility and hardness of the film. , UV sensitizers and polymerization initiators for curing initiation, other fillers, coupling agents (silane-based, titanium-based, etc.) to improve adhesion, radical inhibitors for storage stabilization, etc. things are used. In any case, it is sufficient that the material does not lose its translucency after molding, has a refractive index difference of 0.05 or less with the transparent substrate, has good adhesion to the substrate, and has good releasability from the stamper mold. Good things are necessary.

The 2P process uses photo-polymers.
After applying the above-mentioned photocurable resin composition onto a transparent substrate, a stamper mold is brought into close contact with the substrate and energy such as ultraviolet rays is applied from the substrate side to form the resin composition. The stamper mold is transferred by curing. The stamper base has track grooves, preformats, track portions, etc. formed in a desired shape as an uneven pattern.

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

The film coating layer 2 has a size corresponding to the recording area portion 28.
5, stack the resin thin film detection tables, sandwich the thermoplastic resin adhesive in the gap between the film coating layer 25 and the card base material 24, and place them on a heat fixing roll heated to about 90 to 150°C. Optical carts can be manufactured by crimping them together.

In some cases, it is also possible to further provide a heart coat layer on the transparent substrate 21 to prevent scratches on the DRAW type optical card manufactured as described above. Alternatively, it is also possible to form an ultraviolet absorbing film on the transparent substrate 21 in order to increase the optical properties. Alternatively, if the transparent substrate itself is made of a resin containing an ultraviolet absorber, this is a preferable configuration because the tt light properties and durability can be increased simply by providing an octocoat layer.

[Function] As mentioned above, in the conventional optical cart (tight sealing structure) using a transparent substrate on which track grooves 26 are formed using a photocurable resin by the optical transfer method, the curable It has been observed that when the optical recording layer 22 is formed on the track groove surface on which the track groove part 26 made of resin 1 is formed, optical recording becomes somewhat difficult.
It is thought that by providing the film coating layer 25 on the side other than the transparent substrate 2, the optical recording characteristics are slightly restored and recording becomes easier.

This is thought to be due to the creation of a microscopic space layer between the optical recording layer 22 and the film coating layer 25, and unlike conventional optical cards, the optical card does not have a completely sealed structure, but instead has a pseudo-hollow structure. It is thought that it has a card configuration. Therefore, it is considered that the configuration is similar to that of an optical disk, and the sensitivity of optical recording is improved in the recording area portion 28 where the film coating layer z5 is applied.

With such a configuration, by using a method of painting the margin part 29 and the recording area part 28 separately, the recording area part is detected by detecting the tracking signal while preventing writing by the reproduction light in the margin part 29. Although it is possible to consider an embodiment in which the original optical recording is possible in 28, this method is thought to cause problems such as the accuracy of separate coatings and the disturbance of optical characteristics at the edges of overlapping coatings.

In contrast, in the present invention, the optical recording layer 22 is
The recording area portion 28 and the recording area portion 28 are on the same plane and have uniform characteristics, and only the recording area portion 28 to which the film coating layer 25 has been applied has recovered the improvement in sensitivity. Therefore, there is an advantage that the manufacturing process is extremely simplified compared to separate painting.

[Example] Next, an example of the present invention will be described, but the present invention is not limited thereto.

Example 1 Transparent resin substrate (height: 75 mm, width: 90 m5, thickness: 0.4 mm, polycarbonate plate containing ultraviolet absorber,
Panlite 211 (manufactured by Kijin Kasei ■), neopentyl glycol diacrylate (7 parts by weight), bisphenol-based epoxy acrylate (3 parts by weight) [acrylic acid on Epicoat 828 (trade name, manufactured by Yuka Shell Epoxy ■) Track grooves were formed by a 2P molding method using a photocurable resin mixture consisting of a difunctional acrylate added and benzoin isopropyl ether (lffi parts). A substrate for an optical cart was obtained, which consisted of a track groove of 113 ps, a track groove pitch of 13 gm, and a track depth of 1300 stripes.

The optical cart substrate was dried at 120°C for 38R to complete the removal of residual monomers and polymerization, and as an undercoat layer, Colcoat 103X (manufactured by Colcoat ■) was applied by spin cord method, and dried at 50°C for 3HR. 500
A thin silica film was formed. On the undercoat layer, a solution of a dye of formula (I) shown below dissolved in dichloroethane at a concentration of 1.6 wt % was applied by a spin code method to form an optical recording layer with a thickness of 1000 mm.

Polyethylene terephthalate [Hostaphane RE-
5. Hoechst II] was layered on the optical recording layer to a thickness of 50 mm.
Further layer pm thermoplastic adhesive (Evaflex Tri-Film) to use as a cart base material.

A polycarbonate plate with a thickness of 0.3 mm was placed on it and thermocompression bonded using a hot roll with a surface temperature of 110°C to create an optical cart.

Next, from the transparent substrate side of the optical cart, a semiconductor laser beam with a wavelength of 830R
W, spot diameter 4.5 end-φ, laser pulse width 80p
, s, and a cart feed speed of 60 s+ge/s, a contrast ratio of 0.57 was obtained in the recording area.

On the other hand, the contrast ratio of the margin portion was 0.2 or less, which was a low value for most recording contrast ratios. However, the contrast ratio represents the ratio of the reflectance of the non-recorded area to the value obtained by subtracting the reflectance of the recorded area from the reflectance of the non-recorded area.

When this optical card was repeatedly played back on a track on which trees were recorded under the conditions of a card feed speed of 60 mm/s and a playback optical power of 0.4 all, the tracking signal in the margin area remained even after 30,000 reciprocations. No deterioration was observed. In addition, in order to select a track for track access, the optical head was moved back and forth 10,000 times in the short direction of the optical card at a speed of 30 m@/s, but writing by reproduction light in the margin area was not possible. Could not be detected.

[Effects of the Invention] As explained above, in the optical card of the present invention, the optical recording layer is formed by providing a film coating layer only in the recording area of 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 where the optical card is located, and suppresses tracking errors caused by stopping the optical card from reversing and stopping when selecting a track during track access.

In particular, when the track grooves are formed by stamper-type optical transfer molding using the 2P process, the recording sensitivity is recovered in the areas where the film coating layer is provided on the optical recording layer, and the recording sensitivity is recovered in the areas where the film coating layer is not installed. In optical information recording carriers such as optical cards that require a margin area other than the recording area (however, an area for tracking and autofocus control), as this causes a decrease in recording sensitivity. According to the present invention, recording and reproduction of optical cards can be performed with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of an optical cart 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 sectional view of a conventional DRAl# type optical cart. A schematic plan view showing the recording format and FIG. 4 are schematic diagrams of the optical card reproducing method. 21--Transparent base material 22--Optical recording layer 23--Fixing layer 24--Card base material 25--Film coating layer 26--Track groove 27--Optical recording material 28- ...Recording area part 29--Margin part agent Norihiro Watanabe Figure 1 28 Arrangement'' candidate section

Claims (3)

[Claims] (1) An optical recording layer is provided on the track groove portion of a transparent substrate having a track groove, the recording area portion of the optical recording layer is covered with a film coating layer, a fixing layer is further laminated thereon, and the film coating layer is formed. An optical card comprising: fixed to a recording area portion of an optical recording layer. (2) The film coating layer is made of a thin resin film that does not substantially change the recording area of the optical recording layer at least in an unrecorded state at the contact interface with the recording area of the optical recording layer. The optical card described in Section 1. (3) A patent in which the transparent substrate having track grooves is a transparent substrate formed by forming a photocured transfer product of a photopolymerizable resin composition obtained by stamper-type phototransfer consisting of a desired preformat on the transparent substrate. An optical card according to claim 1.