JPH0312038A - Optical card manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an optical card, which is an optical information recording medium.

[Conventional technology]

Traditionally, the alignment of transparent substrates performed in the manufacturing process of optical cards involves drilling through holes during molding of the transparent substrate, forming concave holes in the substrate, or conversely forming convex protrusions. In addition, it forms a reference surface with a high external grain size,
Using these as standards, the process was carried out by holding pins and butting. In addition, for positioning by optical reading, registration marks called registration marks were printed on the transparent substrate in advance. Furthermore, uneven grooves and the like were formed on a transparent substrate and these were read optically.

[Problem to be solved by the invention]

However, the above-mentioned conventional positioning methods using pin stand and abutment have poor accuracy, and furthermore, debris is generated when forming holes and reference surfaces, and dust and dirt are generated when the transparent substrate comes into contact with the pin stand and abutment. It easily adhered to the substrate.

Furthermore, the printing of register marks requires a wide line width, a poor M degree, and an additional printing process, which requires an extra number of processes.

Furthermore, when forming uneven grooves or the like on a transparent substrate, the grooves are formed on the surface to be bonded to the backing material, so if the transparent substrate is bonded to the backing material with an adhesive or the like, it becomes difficult to read optically. This is because the index of the adhesive and the transparent substrate are close. Furthermore, if the marks are formed on the side opposite to the bonding surface to make them easier to read optically, a mold or damper for the alignment mark is required in addition to a mold or stamper for forming the track grooves.

The present invention has been made in view of the problems of the prior art described above, and provides a method for manufacturing an optical card having alignment marks that are optically easy to read through simple steps.

(Means for Solving the Problems) According to the present invention, when forming track grooves on a transparent substrate, alignment marks are formed on the same surface of the transparent substrate as the track grooves using the same forming method as the track grooves. Next, an optical recording layer is formed in the optical recording area where the track grooves are formed and at the same time is formed on the alignment mark, and the mark is optically read and used as alignment means to adjust the outer shape of the optical card. The alignment marks can be easily read optically when cutting out the material, pasting it with the backing material, etc., and these processes can be carried out efficiently.In addition, this method requires almost no new separate process. Alignment marks can be formed in a simple process.

That is, in the present invention, the alignment mark is formed by the same means as the track groove forming means, that is, the combination method in which the shape of these molds is transferred using a metal mold or a glass mold;
Track grooves can be formed simultaneously on the same substrate surface by injection method, casting method, photopolymer method, etc. Furthermore, by using an optical recording layer as a reading means, the optical recording layer is placed on the track groove as an optical recording area. When forming a mark, it can be formed on the alignment mark at the same time by the same means, that is, a spray method, a spin method, a roll coating method, a gravure method, etc., so the alignment mark can be formed very easily. Since this alignment mark is read optically, it can be detected accurately and quickly, making it possible to significantly improve the efficiency of the process of cutting out the outer shape of the optical card.

In the present invention, the line width and depth of the alignment mark are preferably the same or greater than the line width and depth of the track groove, since it is difficult to form the alignment mark if it is narrower and deeper than the line width or depth of the track groove. In order to improve positional accuracy, it is preferable to have the same width and the same depth. The shape may normally be + (plus), but is not limited to this. Also, the position of the alignment mark may be any position on the transparent substrate, but
Particularly, if it is located outside the card outline and in the margin area, it will not remain inside the card outline after the card outline is cut out, which is preferable in terms of appearance. Further, the number of marks may normally be two.

Next, the alignment mark according to the present invention will be explained with reference to the drawings. Note that in the present invention, components other than the alignment marks can be constructed using known techniques.

FIG. 1 is a schematic plan view of a transparent substrate that best represents the features of the alignment mark according to the present invention.
2 is the outer shape of the card cut out from the transparent substrate 1; 3 is the track groove formed on the transparent substrate; 4 is an alignment mark formed on the transparent substrate; 5 is an optical recording The optical recording area 6 is an optical recording layer formed on the alignment mark 1 .

In the present invention, the transparent substrate 1 has high optical transmittance,
Any resin substrate with low birefringence may be used. Preferred are polycarbonate and polymethyl methacrylate. The track grooves 3 and alignment marks 4 are formed by injection method, compression method, or hot stamping method.

There are casting methods, 2P methods, etc. Preferably, the compression method is used for polycarbonate substrates, and the casting method is preferable for polymethyl methacrylate substrates.

The optical recording layer is made of Te, Sb, Mo, Ge, V,
Inorganic optical recording materials such as oxides such as Sn, compounds such as Te-5n and Te0x-Ge, anthraquinone,
Organic optical recording materials such as derivatives such as phenanthrene and dyes such as azo and polymethine can be used.

The method for forming this optical recording layer includes vacuum evaporation for inorganic systems and solution coating for organic systems. In the present invention, an organic solution coating method is preferred because of the simplicity of the process.

The alignment mark shown in FIG. 1 is a groove with the same depth and width as the track groove 3 on the outside of the track groove 3 within the same plane as the track groove 3 of a mold or glass mold for forming the track groove 3. The mark can be formed by an injection method, a compression method, etc. using this mold, and an optical recording layer can be formed on the mark by a gravure method, a spray method, etc. using the same method as the optical recording layer. can be done.

FIG. 2 is a schematic plan view showing another aspect of the alignment mark. In FIG. 2, the line width and depth of the alignment mark 4 are the same as the track groove 3, the position of the alignment mark 4 is at the intersection of the track groove 3 and the card outer shape 2, and the position of the alignment mark 4 is at the intersection of the track groove 3 and the card outer shape 2. It shares a part with the groove. As a result, the optical recording layer can be formed over a wide range to include the alignment marks 4. Alignment mark 4 at such a position
Even if the optical recording area 5 is formed, there is no problem in appearance, and the optical recording area 5
will not be narrowed.

The alignment marks shown in FIG. 2 form track grooves 3;
By forming the optical recording layer, they can be formed simultaneously. That is, this alignment mark is located in the track groove 3.
A part of the optical recording layer is used as is.

The optical card manufacturing method of the present invention can be carried out by known means other than the alignment means using the alignment marks. Further, the alignment marks can be read by a pattern recognition method using an optical microscope or the like.

(Example) Using a set of TiN molds, one of which has a mirror surface and the other has track grooves 3 and alignment mark grooves 4 as shown in FIG. 70m
A transparent substrate (mx 100non x to, 4mm) was compression molded. The temperature at this time is about 120
℃ and the pressure was about 38 g/cm2. After cleaning and drying the molded substrate, it is processed using the single-wafer direct gravure method for approximately 10 minutes.
An optical recording layer of 0.0000 was coated onto the substrate. After optically reading the alignment marks formed on the substrate and performing high-level alignment, the substrates are bonded together using backing material and hot melt adhesive so that the optical recording layer is on the inside, and then A hard coat layer was formed and cut using a C02 laser to produce an optical card. The resulting optical card had no deviations due to poor alignment and had good optical recording properties.

(Effects of the Invention) As explained above, by forming the alignment marks at the same time as the track grooves, and then forming the recording layer on the alignment marks at the same time as forming the recording layer in the recording area where the track grooves are formed, Index matching, which is achieved by bonding the transparent substrate and backing material with adhesive, prevents alignment marks from becoming difficult to read optically, and allows cutting and logos with high positional accuracy between the card outline, track grooves, and recording area. Printing with good positional accuracy is possible.

Further, there is no problem in appearance, and generation of dust and the like is reduced when forming alignment marks and performing alignment. Furthermore, the manufacturing process can be simplified, productivity can be improved, and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view that best represents the characteristics of a transparent substrate on which an alignment mark according to the present invention is formed, and FIG. 2 is a schematic plan view of a transparent substrate showing another aspect of the alignment mark. 1... Transparent substrate 2... Card outline 3... Track groove 4... Alignment mark 5... Optical recording area

Claims (1)

[Claims] When forming the track grooves on the transparent substrate, alignment marks are formed on the same surface of the transparent substrate as the track grooves using the same method of forming the track grooves, and then the optical recording layer is formed on the same surface of the transparent substrate as the track grooves. 1. A method for producing an optical card, characterized in that the optical card is formed on an alignment mark at the same time as it is formed on an optical recording area, and the mark is optically read and used as alignment means.