JPS6299932A - Production of optical recording medium - Google Patents

Abstract

PURPOSE:To obtain a read only optical recording medium by a simple method by adhering the side of the 2st substrate worked with a metallic layer to a pattern shape where the metallic layer is provided and the printing surface of the 2nd substrate provided with ink having an optically high density by a printing method. CONSTITUTION:A photoresist layer 4 is formed on the surface of the metallic layer 3 having the high reflectivity of the transparent substrate 2 and is exposed via a master plate mask 5 converted with digitized information to dot-like or other patterns; thereafter the resist is developed by which the 1st transparent substrate 1 having the fine pattern layer of the metal having the optically high reflectivity is formed. The 2nd substrate 6 consists of a base material 7 and the ink layer 8. The ink layer 8 is formed of the ink having the optically high density by the printing method. The metallic layer surface side of the 1st sub strate 1 and the ink layer surface side of the 2nd substrate 6 are adhered by thermal welding or optically transparent adhesive agent, by which the optical recording medium is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing a read-only optical recording medium.

[Prior art and its problems]

Optical recording has advantages over magnetic recording in that there is no contact between the recording medium and the head, and high-density recording is possible. As for this optical recording medium, there are said to be 1&exclusive type, additionally writable type, and erasable/rewritable type.

As a read-only optical recording medium according to the present invention+
,′! , has already been put to practical use in compact discs, optical video discs, etc. However, the method used in these optical recording media is to irradiate the irregularities formed in the medium with coherent light, and then interfere with the reflected light. This is used to read out a 1-tone signal, and many errors occur during reading. Of course, it is desirable that this readout error be zero, but is there sufficient reliability in terms of interference due to unevenness? can't get it. Furthermore, uneven deformation and scratches,
Dirt can interfere with the accurate reproduction of data, so care must be taken when handling and storing the media.1 For example, if the media is used in harsh environments where it may be exposed to bending or friction when handling postage cards, etc. As a recording method for optical recording media, there are many disadvantages in terms of durability and it is difficult. On the other hand, as for other types of optical recording media, which parts have high optical reflectance and which parts have low reflectance? Each part is made of a different material, and the shading forms a pattern to create digital information. An optical recording medium for recording is mentioned. In this method, a grayscale signal is formed by reflection and absorption (non-reflection) of the reading irradiation light, so it is superior to the above-mentioned interference method in terms of both reliability and durability of data reproduction. A method for forming a light pattern using this method is, for example, as disclosed in Cf￥f Publication No. 60-6/6546 VC.
Is it possible to form a VCT layer and use etching technology to remove only one layer of material? This is done by removing the material and exposing the other material to the back surface. However, according to this method, optically low reflectance? has tri k l:I]ml
If it is formed using ink, will this ink layer be exposed to the etching solution during etching, resulting in discoloration or falling off? Wake up,
tE Accurate news? There are defects that cannot be formed.

[Purpose] The present invention was made in consideration of the point d between the above-mentioned conventional techniques, and it is possible to create a flattened pattern using a material having optically high reflectance and low anti-Iif coefficient. Digital news by forming? This is a simple and convenient method for recording AA on a read-only optical recording medium.

[a　required]

Does the present invention have high optical reflectance? Have money 4j sound? Photoresist on a transparent substrate? Apply.

Next is the fine pattern? Do you have a mask? 4 lights through.

4 Gold $1-? of the seventh substrate in which the V cyst pattern was formed using +-'l and then the metal was processed into a pattern by etching. Provided side and optically high concentration? The printed surface of the second substrate provided by the ink stamp-1j method is adhered to the printed surface of the second substrate using thermal adhesion or adhesive, and a shading pattern is formed from the transparent substrate side. It is characterized by forming.

[Details of the invention]

The present invention will be explained in detail below based on the drawings.

The embodiment of the Y-th substrate applied to the present invention is shown in FIG. 41, and the FI board 1 is composed of a base material 2 and four gold layers 3. As a base material, it has excellent optical transparency and
mechanical and thermal properties? I have it.

Deformation or deterioration during the peak process? Films such as polyvinyl chloride, polyvinylidene chloride, acrylic (!11), polycarbonate, nylon, polyester (lta), etc. are not particularly included if they do not occur.

Seats are available. Metal 1 sound 3? A8. Gold 1 material with high optical reflectance such as Cr? Can also be used as gold@1-? In order to form the base material 2, it is necessary to use a conventional method such as vacuum evaporation or sputtering to obtain a sufficient reflectance.
It should be formed on top.

Next is the resist pattern on metal 43? Formation.

The formation method may be according to a known method. Ding nawachi.

High reflectance of 4 transparent plates as shown in Figure 2? A photoresist material 4 is formed on the surface of the metal layer 4 by a method such as a spinner or spray.

This is then exposed to light through an original mask 5 which has been converted into a pattern such as Toronuma's digitized information dots, and is then visualized (FIG. 3). Here, with the photoresist material used for the first time, there are no problems such as melting or peeling during the 5th processing and 1st processing.

Furthermore, FIG. 3 shows a positive type resist.

The use of a negative resist does not control or eliminate this. Next, the substrate on which such a resist pattern is formed is subjected to an etching process. The etching process can be a known wet or dry etching process (FIG. 4). Through the above steps, a transparent substrate having a gold-4 pattern 14 having a high optical reflectance is produced. In addition.

Even if the resist material is optically excessively high against waves,
When viewed from the side of the transparent substrate 1, the resist material is located in the shadow of gold 41-, so it is irrelevant to the reproduction of information, and the resist material remains white even if it remains, or may be removed.

The embodiment of the Y-th substrate 6 according to the present invention is shown in FIG.

The base material 7 is not particularly limited as long as it has the mechanical and thermal properties of a bottle (1) It may be the same as the base material 2 used for the 90th substrate 1 related to the present invention, and other materials include polyethylene,
It is also possible to use polypropylene/, BS tree, etc. Ink: -8 ink is marked with ink with a high rounded 7th degree! It can be created by the il method. In this printing process, it is also possible to simultaneously print other marks that are unrelated to the optical recording section and visible from the base material 7 side, which leads to simplification of the process. Furthermore, this ink 14 will not be exposed to a lot of #-shavings later on.
There is no discoloration or falling off of the ink, so there is no loss of recorded information, and a wide range of ink materials can be used for important purposes.

Next, the gold 4-layer side of the Y-th substrate, which has been semi-V-captured in this way, and the ink 1-side of the seventh substrate are bonded together using thermal fusion or an optically transparent adhesive. An optical recording medium can be obtained. As for the adhesive, since the adhesive itself is sealed, any M-type adhesive can be selected as long as there is one extra. For example, a thermosetting type such as acrylic or epoxy can be used. .

In addition, the thickness of each layer is not particularly limited, and the thickness of each layer is not particularly limited.

Just set it according to @ of the recording medium such as a disk.

[Example] On a polycarbonate base material with a thickness of 0.5 volts, a photoresist (8th layer) of 2000 was deposited by sputtering. Then, a photoresist (manufactured by ShibuV Co., Ltd., AZ-1550J) was deposited on an A6
It was applied onto the surface by a spin code method, and after 19 days of close contact through an original mask having a pattern of IQ μm pitch, it was applied to the present surface. Additionally, 16 parts of phosphoric acid, 2 parts of acetic acid, 1 part of nitric acid, and 1 part of water.
AeI- was etched using a mixed solution of 100 ml to prepare a first substrate. The second substrate was formed by printing black ink all over polyvinyl chloride as the stem material. Furthermore, the first
When the A2 side of the substrate and the ink layer of the second substrate were adhered using a thermosetting adhesive, an optical recording medium with good contrast was obtained.

〔Effect of the invention〕

According to the present invention, in manufacturing a read-only optical recording medium in which information is recorded by optically contrasting a high reflection coefficient with a low reflection coefficient, materials having each reflectance are applied twice on the same substrate. □□ At the same time as printing ti11 of round characters and highly immersive ink that exhibit optically low reflectance and without forming other prints, 5 things are interesting. Furthermore, high optical a degree inks exhibiting low optical reflectance are not subject to many chemical treatments and can therefore be selected from a wide range of materials.

[Brief explanation of drawings]

1 to 6 are enlarged views of 100 sections at each step of the present invention. 1: Yth substrate 2: Base material 5: Metal layer 4: Photoresist 5: Original plate 6: 'Small' substrate 7: Base material 8: Ink 1-

Claims (1)

[Claims] A photoresist is coated on a transparent base material provided with a metal layer with high optical reflectance, and then a resist pattern is formed by exposure and development through a mask with a fine pattern, and then the metal layer is patterned by etching. The side of the first substrate processed to have a metal layer provided thereon and the printed surface of a second substrate provided with ink having an optically high concentration by a printing method are bonded by heat fusion or adhesive, and the A method for manufacturing an optical recording medium, characterized in that digital information is recorded by forming a light and shade pattern from the side of a transparent substrate.