JPS62110636A - Optical recording medium and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a cheap optical recording medium that can form quickly unevenness as data pits and suitable for massproduction by providing a reading light absorption layer made of a colored layer that absorbs reading light and has a data pattern on a transparent substrate, and providing a highly reflective reading light reflection layer on it. CONSTITUTION:A data pit 5 is provided on a transparent substrate 2 to form a reading light absorption layer 3, and a reading light reflection layer 4 is formed on it. A colored layer in which the whole layer or at least a face in contact with the substrate 2 absorbs leading light is formed. The layer 4 consists of a thin film made of Al or other highly reflective material. In forming the layer 3, resist 11 is applied on the substrate 2 and a data pit pattern is formed by exposing and developing through a mask 12 having the data pit pattern. Then, the resist 11 is colored with reading light pigment. A light reflection layer 4 (14) is formed on it by plating or vapor deposition.

Description

Detailed Description of the Invention (a) Purpose of the Invention [Field of Industrial Application] This invention relates to an optical recording medium and a method for manufacturing the optical recording medium.

In recent years, cards on which various types of information are recorded have been mentioned, such as ID cards, cash cards, and bank cards.

[Prior Art] It is necessary to record various information such as personal data and issuing company data on this type of card, and in the initial stage, such information is recorded in visible characters and symbols. In addition, in the later stages of 45, information is recorded using electrical signals using magnetism, but it is necessary to prevent tampering and deal with the increasing number of information leaks.

To this end, laser cards that utilize laser technology have recently been developed. This laser card is equipped with an information recording medium (optical recording medium) that has an optically reflective surface, and the optically reflective surface has irregularities that function as data bits and guide tracks, and the difference in optical reflection between the concave and convex parts. The device is configured to detect data bits using a laser and read information.

Optical recording media like this! l'? In the case of L, techniques used for optical discs, compact discs, laser discs, etc. are applied, and a stamping method is used to form data bits.

That is, as shown in FIG. 7, the optical reflection of the optical recording medium)
To form unevenness on one side, use a transparent bulb 21 made of glass or the like.
A pattern of data bits 23 is formed by irradiating a resist 22 on the resist 22, and a nickel film 24 is formed on this by plating or the like to obtain a mask. and transparent plastic materials such as polycarbonate and acrylic26
The optical recording medium 20 was produced by copying by injection molding or the like and applying an aluminum reflective film 27 to the recording surface.

[Problems to be solved by the invention] However, this process is extremely complicated, takes time to make the mold, and requires high costs, making it difficult to respond to urgent production or orders for a large number of products in extremely small lots. was an inappropriate method.

In particular, the unevenness that makes up the data bits requires extremely high precision because it uses optical reflection. Therefore, it requires considerable effort to control the resist film thickness, so it is difficult to produce small-lot or inexpensive products. It is extremely difficult to obtain optical recording media.

This invention was made in view of the above circumstances, and it is possible to quickly form irregularities on an optical reflecting surface that functions as data bits, and therefore, it is possible to produce on-demand and at low cost. The object of the present invention is to provide an optical recording medium and a method for manufacturing the same.

(B) Structure of the Invention [Means for Solving the Problem] Corresponding to this object, the optical recording medium of the present invention includes a transparent substrate and at least a surface in contact with the substrate that is colored to absorb reading light. a reading light absorbing layer having a data pattern etched and perforated therein; and a reading light reflecting layer having high reflectivity for reading light and applied from above the reading light absorbing layer. It is characterized by being prepared.

Further, in the method for manufacturing an optical recording medium of the present invention, at least the side in contact with the substrate has a colored layer capable of absorbing reading light on one side of a transparent substrate, and a data pattern is etched and perforated. It is characterized by comprising a reading light absorption layer forming step of forming a light absorption layer, and a reflective coating forming step of forming a reflective coating having high reflectivity for reading light over the reading light absorption layer. There is.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment.

In FIG. 1, reference numeral 1 denotes an optical recording medium, and the optical recording medium 1 has a reading light absorbing layer 3 formed on a substrate 2, and further has a reading light intensity of +174 formed thereon.

The substrate 2 is made of polycarbonate resin, acrylic resin,
It is made of a material with good light transmittance, such as glass. The reading light absorption layer 3 is formed on the JJ plate 2, and has hole-shaped data bits 5 formed therein. Therefore, although the surface of the substrate 2 is exposed in the data bit 5 portion, the exposed portion is covered with the reading light reflecting layer 4. The entire reading light absorbing layer 3 or at least the surface on the side that is in contact with the substrate 2 is colored so as to be able to absorb reading light. The reading light reflecting layer 4 is made of a thin film made of a material having high reflectivity, and examples of such materials include AI, cu, Aa, and N;

Cr, Zn, 3n, etc. can be used. The reading light reflecting layer 4 is formed by plating or vapor deposition on the reading light absorbing layer 3 and covers the surface of the substrate 2. Further, the data bits 5 formed on the reading light absorbing layer 3 are perforated by being transferred from a mask having such a pattern or from a photographic film. This type of transfer was made by etching. Further, as the reading light, near-infrared light such as semiconductor laser light, white light, and visible light such as tungsten light are suitable, but infrared light and ultraviolet light can also be used.

In the optical recording medium 1, the data bits 5 may be configured as a bright area as shown in FIG. 2, or may be configured as a dark area as shown in FIG.

Next, a method for manufacturing the optical recording medium as described above will be explained with reference to FIG. 4 and subsequent figures.

As shown in FIG. 4, the method for manufacturing an optical recording medium of the present invention includes a reading light absorbing layer forming step A and a reflective coating forming step B performed after the reading light absorbing layer forming step. I'm here.

The reading light absorbing layer forming step A is a step of forming a reading light absorbing layer on one side of a transparent substrate, in which at least the side in contact with the substrate has a colored layer capable of absorbing reading light and a data pattern is etched and perforated. The reflective coating forming step B is a step of forming a reflective coating having high reflectivity for reading light on the reading light absorption layer. In reading light absorption layer forming step A, first, a resist 11 is spin-coded on the substrate 2 (FIG. 4(a)). This resist 11 may be of positive type or may be of negative type.

Next, a mask 12 having a pattern of data bits is brought into close contact with the resist 11 and exposed to light (FIG. 4(b)).

Next, the exposed resist 11 is developed (FIG. 4(C))
. As a result, the transfer of the data pattern onto the resist 11 is completed, and a hole corresponding to data bit 5 is formed in the resist 11, and the resist is removed and no longer exists in the hole.
The surface of the substrate 2 is exposed, and the remaining portion of the surface of the substrate 2 is covered with a resist 11. Next, the resist 11 on which the data bits 5 are formed is read and colored with a light-absorbing dye (FIG. 4(d)). Examples of reading light-absorbing dyes include the following. For semiconductor lasers, gold TA gff system, cyanine system, squarylium system, and naphthoquinone system are used; for He-Ne laser, phthalocyanine system, 1-rephenylmethane system, and anthraginone system; for visible light, there are: Azo etc.

As a result, the reading light absorption layer 3 is formed, and the reading light absorption layer forming step A is completed.

Next, as a reflective coating forming step B, a reading light layer consisting of a metallic film is formed by plating or vapor deposition on the reading light absorption layer 3! l) Forming a reflective 'f&' film constituting the J layer 4. In this way, at the stage where reading light reflective layer forming step B is completed! The upper surface of the three roots 2 is in contact with the reflective coating 14 at a portion corresponding to the data bit 5, and is in contact with the resist 11 at other portions.

In addition, in the method explained above, in order to form the colored reading light absorption layer 3, after the data pattern is transferred to the resist 11, in the step of FIG. 4(d), the resist 11 is
is colored, but this may be done in a manner not shown in FIG.

That is, in the method shown in FIG. 5, a resist 11 that has been colored in advance is spin-coated on a substrate 2 (FIG. 5(a)). This resistor 11 may be of positive type or may be of negative type.

Next, a mask 12 having a pattern of data bits is brought into close contact with the resist 11 and exposed (FIG. 5(b)).

Next, the exposed resist 11 is developed (FIG. 5(C))
. As a result, the transfer of the data pattern to the resist 11 is completed, holes corresponding to the data bits 5 are formed in the resist 11, and a colored reading light absorption layer 3 is obtained. Reading light reflection)! The formation of ij4 is the same as in the embodiment shown in FIG.

FIG. 6 further shows a manufacturing method according to Haku's embodiment, in which a reading light absorbing layer 3 made of a resin colored with a reading light absorbing colorant is formed on one side of the substrate 2.
)) Next, a resist 11 is spin-coded on the reading light absorption layer 3 (FIG. 6(b)). This resist 11 may be of positive type or may be of negative type.

Next, a mask 12 having a pattern of data bits is closely exposed onto the resist 11 (FIG. 6(C)).

Next, the exposed resist 11 is developed (FIG. 6(d))
. As a result, the transfer of the data pattern to the resist 1 to 11 is completed, and a hole corresponding to the data bit 5 is formed in the resist 11, and the resist is removed and no longer exists in the hole, and the surface of the reading light absorption layer 3 is is exposed, and the remaining portion of the resist 11 covers the surface of the reading light absorption layer 3 (FIG. 6(d)).

Next, the reading light absorbing layer 3 is etched from above the resist 11. As a result, the portion of the reading light absorption layer 3 that is not covered with the resist 11 is removed to expose the surface of the substrate 2, and the portion of the reading light absorption layer 3 that is covered with the resist 1-11 is removed from the surface of the substrate 2. It remains together with the resist in whatever state it is placed on top (FIG. 6(e)).

In this reading light reflection layer forming step B, resist 1
6(f), or after removing the resist 11 (FIG. 6(0)), the reflective coating 14 is formed on the reading light absorption layer 3 (FIG. 6(0)). Figure 6 (h)).

[Operations and Effects] In the optical recording medium configured in this way, as shown in FIG. 1, reading light is irradiated from the bottom surface of the substrate 2, reflected by the reading light reflection layer 4, and the reflected light is read. In this case, the data bit 5 can be read by the difference in reflection between the reading light absorbing layer 3 and the reading light reflecting layer 4.

Since such optical recording media can be created using photo-etching technology, vJL and issuance of cards can be done cheaply and quickly, and it is possible to maximize productivity when producing large seedlings, as well as to produce a large number of products in extremely small lots. It is also possible to respond to orders quickly and at low cost.

Furthermore, since the optical recording medium configured in this way is not used as a standby but as a medium for directly recording optical signals, it is also possible to control the thickness of the reading light absorption layer that forms the bottom of the groove for data bits. It's easy.

[Brief explanation of drawings]

Fig. 1 is an enlarged sectional view of an optical recording medium, Fig. 2 is an enlarged perspective view of the optical recording medium, Fig. 3 is an enlarged perspective view of another optical recording medium, and Fig. 4 is the manufacture of the optical recording medium. FIG. 5 is a process explanatory diagram showing the manufacturing process of another optical recording medium, FIG. 6 is a process explanatory diagram showing the manufacturing process of another optical recording medium, and FIG. 7 is a process explanatory diagram showing the manufacturing process of another optical recording medium. FIG. 2 is a process explanatory diagram showing a method for manufacturing an optical recording medium. DESCRIPTION OF SYMBOLS 1... Optical recording medium 2... Substrate 3... Reading light absorption layer 4... Reading light reflective layer 5...
・Data bit 11...Regist 12...
Mask 14...Reflective coating Figure 1 Figure 3 Figure 2 +4 (4)

Claims (6)

[Claims] (1) a transparent substrate and a reading light absorbing layer in which at least the surface in contact with the substrate is constituted of a colored layer capable of absorbing reading light, and a data pattern is etched and perforated; and the reading light absorbing layer. 1. An optical recording medium comprising: a reading light reflecting layer which is applied from above and has high reflectivity for reading light. (2) A reading light absorbing layer forming a reading light absorbing layer on one side of a transparent substrate, at least the side in contact with the substrate has a colored layer capable of absorbing reading light and has a data pattern etched and perforated thereon. A method for manufacturing an optical recording medium, comprising: a forming step; and a reflective coating forming step of forming a reflective coating having high reflectivity for reading light over the reading light absorption layer. (3) The reading light absorption layer forming step includes a resist layer forming step of forming a resist layer on the one side of the substrate, and an exposure step of exposing the resist layer through a mask having the data pattern. , a developing step of developing the resist layer and etching and perforating the data pattern, and a coloring step of reading the resist layer and forming the colored layer with a coloring agent having light absorption ability. A method for manufacturing an optical recording medium according to claim 2, characterized in that the method comprises: (4) The reading light absorption layer forming step includes a resist layer forming step of forming a resist layer colored with a colorant having reading light absorption ability on the one side of the substrate, and then forming a resist layer colored with a coloring agent having reading light absorption ability. 3. The photoresist according to claim 2, further comprising an exposure step of exposing the resist layer to light through a mask having a data pattern, and then a developing step of developing the layer of resist to etch and perforate the data pattern. Recording medium manufacturing method (5) The reading light absorption layer forming step includes a colored resin layer forming step of forming a resin layer colored with a coloring agent having reading light absorption ability on the one side of the substrate, and then a colored resin layer forming step on the one side of the substrate. a resist layer forming step of forming a resist layer, an exposure step of exposing the resist layer through a mask having the data pattern, and then developing the resist layer to form the data pattern with the etching holes. Claim 2, further comprising a developing step, an etching step of etching and perforating the colored resin layer, and a resist stripping step of peeling off the etched and perforated resist layer. Method for manufacturing optical recording media (6) The reading light absorption layer forming step includes a colored resin layer forming step of forming a resin layer colored with a coloring agent having reading light absorption ability on the one side of the substrate, and then forming a colored resin layer on the one side of the substrate. a resist layer forming step of forming a resist layer thereon, an exposure step of exposing the resist layer through a mask having the data pattern, and then developing the resist layer to etch the data pattern. Claim 2, characterized in that it consists of a developing step of perforating, and then an etching step of etching and perforating the colored resin layer.
Method for manufacturing the optical recording medium described in section