JPH0480457B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for repairing a card-shaped information recording carrier (hereinafter referred to as an optical card) that optically records and reproduces information, and particularly relates to a method for repairing an optical card. This relates to a method for repairing scratches that occur on the surface.

[Prior Art] Conventionally, magnetic materials have been mainly used as recording materials embedded in cards such as credit cards and bank cards. This magnetic material has the advantage that information can be easily written and read, but on the other hand, there are problems in that the information content cannot be easily changed and high-density recording cannot be performed.

By the way, in order to solve the above problems, an optical information recording method using an optical card has been proposed as a means to efficiently handle a wide variety of information, and an optical information recording carrier (optical card) for this purpose has been proposed. , recording/reproducing methods, recording/reproducing devices, etc. have been proposed.

Optical cards as such information carriers use laser light to evaporate a part of the optical recording layer on the information recording carrier, cause a change in reflectance, or cause a change to produce optical information. Information is recorded or reproduced based on the difference in reflectance or transmittance. In this case, the optical recording layer is
The so-called DRAW (direct read after write) allows for ``direct reading after writing'' without the need for processing.
write) medium, capable of high-density recording,
Furthermore, since additional writing is possible, it is effective as a recording medium for optical cards.

FIG. 3 is a schematic cross-sectional view of a conventional optical card. In FIG. 3, 1 is an optical card, 2 is a transparent base material having track grooves, 3 is an optical recording layer, 4 is an opaque card base material, and 5 is a hard coat layer on the surface.

In FIG. 3, information is recorded and read by optically writing and reading through the hard coat layer 5 and the transparent base material 2. In optical card 1,
Track grooves corresponding to light guide grooves are formed in advance on the transparent base material 2, and tracking can be performed using the phase difference of reflected light by utilizing fine irregularities.

Further, an optical recording layer 3 is formed on the optical card transparent base material 2, an opaque card base material 4 is laminated on the optical recording layer 3, and a hard coat layer 5 is further formed on the other surface of the transparent base material 2. It can be easily manufactured by forming.

Although the optical card 1 thus obtained has a hard coat layer 5, it is generally made of resin mainly composed of acrylate and/or methacrylate, so there is no chance of scratches occurring on its surface. In many cases, this makes it difficult to optically record and reproduce information, or has the undesirable effect of increasing error bits. In particular, depending on the degree of damage, it may become impossible to read information that has already been written, and for example, there may be cases where the information must be read out again and transferred to a new optical card.

[Problems to be Solved by the Invention] In view of the above-mentioned problems, an object of the present invention is to repair scratches generated on the surface side of the transparent base material on which optical information is recorded and reproduced on an optical card. The goal is to make it possible to read the optical card and create a new optical card.

[Means for Solving the Problems] That is, the method for repairing an optical information recording carrier of the present invention is a method for repairing an optical information recording carrier by laminating an optical recording layer and a transparent base material having track grooves on a base material. For scratches that occur on the laser beam incident surface side of the record carrier that cause problems in recording and reproducing optical information, use the same material as the material that constitutes the laser beam incident surface of the optical information recording carrier on the marked surface. A curable resin having a certain refractive index is applied and polymerized to repair the scratches and make recording and reproduction possible again.

More specifically, the present invention provides an optical card in which an optical recording material is provided on a card base material, the optical recording material comprising: (a) a transparent base material having track grooves;
(b) an optical recording layer provided on this track groove surface, and this optical recording material is used as a transparent base material in a DRAW type optical card in which the optical recording layer is provided in contact with an opaque card base material. For scratches that occur on the surface of the material that cause problems in optically recording and reproducing information, we coat the scratched surface with a transparent resin made of a curable resin that has the same refractive index as the surface of the transparent base material. This is a method of repairing the above-mentioned scratches by applying it and curing it.

[Function] The method for repairing an optical card of the present invention is to repair optical damage generated on the surface side of a transparent base material of a DRAW type optical card, which is made by sequentially laminating an optical recording layer and a transparent base material having track grooves on a card base material. For scratches that cause problems in recording and reproducing information, a transparent resin layer is formed by coating the scratched surface with a transparent resin having a refractive index similar to that of the surface side of the transparent base material and curing it. By repairing the scratches, the refractive index of the transparent resin layer and the surface side of the transparent base material can be made to be approximately the same, and recording and reproduction can be performed again.

[Examples] Hereinafter, the present invention will be explained in more detail by showing examples.

FIG. 1 is a schematic cross-sectional view showing the state of scratches generated on the hard coat layer 5 of the optical card 1. As shown in FIG. Same 1st
In the figure, the states of scratches 6, 7, and 8 are shown.
For example, 6 indicates a concave, dent-like scratch that reaches the transparent base material 2, 7 indicates a scratch-like scratch that occurs on the hard coat layer 5, and 8 indicates a deep scratch that also extends to the transparent base material 2.

Normally, the thickness of the hard coat layer is from several micrometers to several tens of micrometers at most, and even scratches smaller than scratch 7 pose a problem when recording and reproducing optical information. However, due to the error correction function, recording and reproducing information on the optical card is not possible for minor scratches.
It is guaranteed that sufficient measures can be taken.

However, optical information such as scratches 6 to 8 cannot be recorded.
For those that impede regeneration, a transparent resin having a refractive index approximately the same as that of the transparent base material 2 and/or hard coat layer 5 is applied to the scratched surface by the method of the present invention, and cured. By doing so, a transparent resin layer can be formed, the scratches can be repaired, and a certain amount of information can be read out.

FIG. 2 is a schematic cross-sectional view showing the wound repair method of the present invention. In FIG. 2, 9 represents a repair layer. The repair layer 9 is obtained by applying a transparent resin to the scratched surface and curing it.

In the present invention, such transparent resins include:
Curable resins mainly composed of acrylic acid (methacrylic acid) esters are preferred, such as polyester acrylate (methacrylate), polyurethane acrylate (methacrylate), polybutadiene acrylate (methacrylate), epoxy acrylate (methacrylate), polyol acrylate (methacrylate), and silicone. Examples include acrylate (methacrylate), but polyolefin-based and silicon-based materials can also be used.

Such curable resins mainly contain monomers, oligomers, polymers, or mixtures thereof having vinyl groups that are easily polymerized by heat, ultraviolet rays, or electron beams, and other necessary components. It contains a polymerization initiator, a photosensitizer, a solvent, a viscosity modifier, a polymerization inhibitor, a leveling agent, an anti-repellent agent, a slip agent, etc., depending on the situation.

All of these curable resins are easily available on the market, and any of them can be used in the present invention.

For example, Delpo MAX (manufactured by Tokyo Paint Co., Ltd.),
Unidate (manufactured by Dainippon Ink Co., Ltd.), Orestar Q602 (manufactured by Mitsui Toatsu Chemical Co., Ltd.), Adeka Ultraset AD-701 (manufactured by Asahi Denka Kogyo Co., Ltd.), Viscoat (Osaka Organic Chemical Industry Co., Ltd.) SA-series (manufactured by Mitsubishi Yuka Fine Co., Ltd.), KAYARAD series (manufactured by Nippon Kayaku Co., Ltd.), Epicoat (manufactured by Yuka Ciel Epoxy Co., Ltd.), etc. be able to.

The above-mentioned coating method for the transparent resin layer forming the repair layer 9 can be carried out by known methods such as roll coating, spin coating, dip coating, and spray coating, taking into consideration the composition, curing method, and viscosity of the transparent resin. You can select as appropriate. Coating is preferably carried out in a clean room to avoid contamination with dust. Also, if the film thickness after curing is too thick, it will be difficult to install it in an optical card playback device and play it, so it needs to be within the allowable range.
The thickness is desirably within several tens of micrometers, preferably 10 micrometers or less.

The transparent resin layer is cured by heating, UV exposure,
This can be done by electron beam irradiation, and ultraviolet curing type is preferred in the present invention.

The exposure amount may be adjusted depending on the composition of the transparent resin described above.

[Effects of the Invention] As explained above, the present invention deals with scratches that occur on the surface side of the transparent base material of an optical card that cause problems in optically recording and reproducing information. By applying and curing the above-mentioned scratches, the above-mentioned scratches can be easily repaired and the above-mentioned recording/reproduction can be made possible again.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing the appearance of scratches occurring on the hard coat layer of an optical card, FIG. 2 is a schematic cross-sectional view showing the scratch repair method of the present invention, and FIG. A schematic cross-sectional view is shown. DESCRIPTION OF SYMBOLS 1... Optical card, 2... Transparent base material, 3... Optical recording layer, 4... Card base material, 5... Hard coat layer, 6, 7, 8... Scratch, 9... Repair layer.

Claims (1)

[Claims] 1. Scratches that occur on the laser beam incident surface side of an optical information recording carrier made by laminating an optical recording layer and a transparent substrate having track grooves on a substrate, causing inconvenience in recording and reproducing optical information. The scratches are repaired by coating the scratched surface with a curable resin having a refractive index similar to that of the member constituting the laser light incident surface of the optical information recording carrier and polymerizing it. 1. A method for repairing an optical information recording carrier, characterized by making recording and reproduction possible again.