JPS58102795A - Recording medium for optical information - Google Patents

Abstract

PURPOSE:To manufacture the optical information recording medium, which consists of a substrate and a recording layer, uses the track of the recording layer as a reflecting layer and a section except the track as a light absorbing layer, employs the flat substrate and efficiently executes tracking servo. CONSTITUTION:The recording layer 2 is formed onto the substrate 1. The recording layer 2 consists of the reflecting layer 3 of the track and the light absorbing layer 4. The titled medium is manufactured by forming a photo-resist layer 5 to the substrate. A photo-resist picture is formed by shaping a pattern (the track) to the photo-resist layer through the use of a normal writing method or the operation of image-like exposure. A section not exposed is removed by a solvent, and the surface is developed. The sections exposed (convex sections) of the photo-resist layer and the surface of the substrate are hydrophilic-treated by a liquid such as a chromic acid mixed liquid. The sections exposed are removed by a solvent. A recording layer forming liquid is applied onto the surface of the substrate to be treated, heated and dried, and the recording layer is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information recording medium in which the reflective layer constituting the recording layer has a track shape and the remaining portion is a light Wk collection layer.

Conventionally, guide grooves for writing have been set up in advance for light information recording media.
A groove with a depth of Ii degrees is formed, and metal,
An information storage medium made by vapor-depositing semimetals and pigments (
For example, see slf#Rvsss-97033 publication jl)
A disk is known in which a track is previously provided on the outer periphery of a medium-flat disk and information is recorded along the track (for example, see Japanese Patent Application Laid-open No. 51-91610).

However, the depth o in VallA degrees of the wavelength of the light beam
In the method of forming the ipI on the substrate, it is difficult to achieve high precision because the irregularities are formed by pressing or injection molding. In addition, although the vinyl chloride resin used as the substrate material has good moldability, it has poor durability, and acrylic resin is difficult to mold.

However, the method of providing tracks in advance only on the outer circumference and distributing information along them has the problem that it is difficult to record anywhere on the inner circumference.

Furthermore, there is a method in which no track is provided in advance, but in this method, the μ-order onrx must be produced only with mechanical precision, making the device expensive.

The present invention was made in view of the above problem K11l, and
The object of the present invention is to provide an optical information recording medium that uses a flat substrate, is manufactured at low cost, and is capable of efficient tracking navigation.

Specifically, the optical information recording medium of the present invention comprises a substrate and a recording layer], the tracks of the recording layer are reflective layers, and the portion of the recording layer other than the tracks is a light absorbing layer. It is something to do.

The structure of the optical information recording medium of the present invention will be explained with reference to the attached drawings. As shown in FIG. 1, a KIea layer 2 is provided on a substrate 1. 6
and a jta collection layer 4. The shape of the track is not limited to concentric circles as shown in FIG. 2, but may be spiral, arc-shaped, or straight in some cases.

Next, the method for manufacturing the optical information recording medium of the present invention will be generally described in 1.
! I will clarify.

First, a photoresist layer is formed by applying a photoresist to a suitable substrate. ``Photoresist'' is a photosensitive substance that dissolves in water or organic solvents due to its original action (it forms a so-called photocurable film), and is generally used to separate the image area and non-image area in photolithography. It is something. As the substrate, commonly used transparent base materials such as glass and zotastic can be used. An O subbing layer such as an oxide in the resin may be formed on the substrate to lower the linear thermal conductivity and improve smoothness.Next, the photoresist layer is applied using the usual writing method or imagewise. By using an exposure operation, a pattern (track) can be applied to the photoresist layer to form a photoresist image. By carefully writing *Ii* on the resist layer so as to expose the photoresist layer to light, it is well known in the art that 9 jig light and q! II
Makes you feel like a solvent-insoluble resist with a notarn.
is formed on the photoresist layer by. ≦aa,
The pattern is formed using a laser or the like to form concentric grooves on the 7-off resist layer in a spiral or linear shape so that tracks on which the recording layer of the optical information recording medium is recorded are formed.
It can be created either by immersion or by exposure through a mask.

1[+ is performed by removing the unexposed portions of the photoresist layer from the p-resist layer with a solvent.

Next, the exposed portion (white portion) of the photoresist layer and the surface of the substrate are subjected to hydrophilic treatment using, for example, a hot chromic acid solution. When the surface of the substrate is removed and removed, the surface of the substrate becomes hydrophilic and becomes 9 parts (un-most part') and the parts that were not treated with parent wood. A recording layer is formed by applying a layer forming liquid and drying it by heating. Application is by brush).

It is applied using a roller, one rotation of a sink, spray painting, etc.

The recording layer forming liquid in the present invention can be prepared, for example, by dissolving a metal compound in a water-soluble resin solution and further adding a dye and a reducing agent.

Metal compounds are reduced to the following metal particles by the action of a reducing agent.
,Muu,Ou,Pd,re,00%Ni,! 1,
v, si.

G., Be, Teh, Mn, Pt% Rh
, Xr% TO, R@, Ru, Os.

MO% 〒a1 ム1, Xn% 8n, 8@,
Te @, Or, Bi, Hf,! ,) Ia, Zr,
W, Zn, Mg, io, )ib, La,
'Pr can be formed. Specific examples of metal compounds include silver nitrate, silver cyanide, potassium cyanide, silver annn complex, silver cyanide complex, gold salt or gold cyanide complex.

As a reducing agent, Hiroformin, alacetate, and sertrite are used.

Reducing sugar primary hypophosphite, sodium boron hydride, dimethyl ambora 7, etc. can be used. The m side is a metal compound 1
It can be used in amounts of α5 to 10 mol, preferably α5 to 4 mol.

Examples of water-soluble resins that can be used include polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid, and polyacrylic acid. The weight ratio of the metal compound to the water-soluble resin is 11 to 10, preferably α5 to t5.

Further, as the color chart used in the present invention, for example, the following dyes can be used.

(1) Direct dyes classified according to their chemical structure include azo, stilbene, thiazole, dioxazine, and phthalocyanine. Representative examples of each are listed below.

(IL) Azo-based 0, x, die L//to-izg-12 (0,1,248
95) Orange 29 (129155) Red 2 (# 23500) Violet 7 (# 27855) Blue 41
(# 42700) Green 33 (134270) 1 59 (# 34040) Brown 25 (# 36030) Black 2
2 (# 35435) 56 (# 34170) (b) Stilbene series 0, engineering, direct yellow 39 p2k 6
2 (0) Phthalocyanine type 0.1. Direct Blue 86 (0,1,741
80) (2) Acid dye (&) Azo type 0, engineering, acid yellow 36 (c, z, 1so6
s) Orange 56 (#22895) Red
9 (115635) Violet 7 (118055) Blue 29 (120460) Green 35 (# 13361) Black 26 (# 27070) (1)) Anthraquinone series 0.1.7- / Rad Bio Vtsu) ((:!, L
61710, 6180 (1) Blue 23CO, Engineering, 6
1t2s) Gree-744 (# 61590) Black 48 (# 65005) (C) Triphenylmethane C1, acid violet 49 (C, 4)
2640) Blue 85 (# 42660) Green 16 (144025) (Tsukasa Kitten series 0.1. Acid Red 92 (0, Engineering, 4541
0) (・)Azine-based C1 engineering, acid red 59 (C, engineering, 5031
s) Black 2 (150420) (3) Basic dye (a) Cyanine series 0, Technique, Paysic-vy Do 12 (C0x, 48
070) Violet 7 (# 48020) (1)
) Azo series 0, Tech, Paysic Brown 1 (0, Tech, 21
000) Black 2 (111825) (0) Azin series 0, x, Bay V Tsuku v Tsudo 2 (0, 1,502
40) Red D #45160) Violet 10 (#45170) Blue 3 (
# 51005) Blue 25 (# 52025) (Triphenylmethane type ○, engineering, Pacific Red 9 (0,1,425
00) Violet! (# 42555) Blue
1 (# 42025) Green 4 (# 42000) (4) Mordant, acid mordant dye (&) Azo type 0.1. Morpunt Yellow 1 (C0 engineering, 14
025) Yellow 26 (# 22880) Orange 37 (# 18750) Red? (#
16105) Violet 5 (115670) 0,:[,! - Danto P#-13 (0, Eng., 1668
0) Green 11 (#20440) Black
? (# 16500) (1) Anthraquinone-based basket - Dantored 3 (Ct, 1.5&005)
Blue 8 (#58805) Black 13 (1,65615)
.

(0) Xanthine-based Morpunt Red 15 (0,1,45305) (
11) ) Riphenylmethane-based Morpunto Pie Oathlet 1 (o, x, 43565)
Blue 47 (146855) (5) Electric dye (a) Antotsuquinone series 0, Technique, Pat/House-2 (0,1,67300) Yellow 4 (z 59100) Orange 2 (# 59705) 0, x, Bat- Red 10 (0,1,6700
0) Violet 13 (# 68700) Blue
18 (#59815) Green 8 (#7
1050) Black? (165230) Green D # 59825) (1)) Indigoid series a, x, pyto * vy di 5 (o, z, 73335
) Orange 7 (# 71105) Red 2 (# 73365) Violet 2 (# 73385) Blue 1
(173000) (6) Disperse dye (a) Azo-based C0, Disnose Yellow 7 (C11,2
6090) Orange 5 (# 11100) Red 7 (# 11150) Violet 24 (# 11200) (1)) Anthraquinone orange 11 (c, x, 607oO) Red 11 (# 62015) Violet
4 (# 61105) Blue 27
(160767) (7) Oil-soluble dye (a) Azo-based 0, H, Sovant Yellow 6 (0, H, 113
90) Orange 5 (# 18745) Red
27 (# 26125) Brown 5 (# 12020) (b) Antotsuquinone Violet 14 (0, Engineering, 61705) Blue 11 (161525) Green
(# 61565) (0) Ivy-based Solvent Blue 25 (0, Engineering, 74350) (
The amount of the triphenylmethane-based 051 (0,1,21260) dye added is preferably α002 to 10, preferably α01 to α01, in terms of weight ratio to the water-soluble resin.

The layer forming liquid prepared as described above is coated on the substrate to form a recording layer precursor, with a film thickness of α1 to 10 μm, preferably 03 to 2 μm. be done. The post-recovery layer precursor coated with the recording layer forming liquid is subjected to heat treatment to form a recording layer. Heating is 50°~1
It is carried out within a temperature range of 50°C, preferably 60°-+100°C.

Although the heating time varies depending on factors such as the heating temperature, it is necessary to carry out the heating at least until the tracks of the recording layer become a reflective layer of metal particles. The portion of the recording layer other than the tracks is a light absorbing layer and is made of metal particles and /l or a metal compound and a dye. Note that the above manufacturing method is for illustrative purposes only and is not intended to be limiting.

Next, one procedure for manufacturing the original information storage medium of the present invention will be explained with reference to FIG.
Next, concentric tracks are formed on the 7-photoresist layer 5 using an argon laser to save electricity, and then developed with a solvent such as K to form tracks 6 (side light portions) (Step B 1).

Next, it is dipped in a chromic acid mixture to perform a parent wood treatment (0 step @). Next, when the track-shaped 7 photoresist layer 6 is removed with a solvent, the hydrophilized portion 7 remains (D
Step), then a recording layer forming liquid is applied and a heat treatment is performed (Step 1 11) to obtain the arrangement medium of the present invention shown in FIG.

This is done by using the spot of a high-energy beam such as a brass laser, but the metal reflective layer also has light absorption properties, and it absorbs heat, causing the p reflective layer to absorb a large amount of 7bX.
Aki, the kikama is made.

Information can be read by applying a laser beam to the information recording medium and changing the amount of reflected light.

The present invention will be further explained below with reference to Examples, but the present invention is not limited thereto.

Example 1 An acrylic substrate was coated with 0.3 μm thick photoresist 7, exposed to light using an argon laser in a thin spiral pattern, and developed. Soak this in a chromic acid mixture for 10 minutes, then rinse with water.
Dissolve the photoresist in a solvent and circle it. Then, treated in this way, the nine substrates were coated with polyvinyl alcohol and 1p water.
9P nitric acid @
l15p 28% ammonia water (L5s135
- Formalin α2d Ring Prue BY α2p A recording layer forming liquid having the above components was spin-coated and heated at vk% 80° C. for 5 minutes to obtain a recording layer having a spiral reflective layer.

Example 2 A substrate treated in the same manner as in Example 1.

Polyvinylpyrrolidone 1P water
9P potassium chloraurate 1P sodium tartrate
α1p After spin-coating a recording layer forming liquid containing the above-mentioned components, the recording layer was dried by heating at 100° C. for 10 minutes to obtain a recording layer having a thinly wound reflective layer.

The reflectance of the reflective layer portion in the near-infrared region was 2711, and the reflectance of the other portions was 8-.

Brass was recorded in the same manner as in Example 1, and 51) rJ/pi
A spot of direct @1 μm depth was obtained with an energy of t.

The reflectance of the spot portion decreased to 15-.

Example 6 A substrate treated with an argon laser concentrically in the same manner as in Example 1 was coated with polyvinyl alcohol and 1F water.
9Pm copper acid α8P28-ammonia water 1d potassium hypophosphite
cL2PO,1,7 Sidpuru 23(o,
z, 61125) (Up) After spin-coating a recording layer forming liquid with the above components, it was heated and dried at 100° C. for 10 minutes to obtain a recording layer having a concentric reflective layer.

The reflectance of the reflective layer portion in the near-infrared region was 25-1, and the reflectance of the other portion was 7-.

Brass was recorded in the same manner as in Example 1. s 5-5 rsX
A spot with a diameter of t1 was obtained with a writing energy of /pit. The reflectance of the spot portion decreased to 12-9.

The optical information recording medium of the present invention manufactured in this way has no reflective layer (mirror surface) and is only a partial optical absorption layer, which has the advantage that tracking signals can be detected more easily. First, according to the method of the present invention, it is easy to manufacture the material in a rounded form, which is a coating method, and since the coating is performed in a flat state, there are also advantages in production in that no bulges 2 occur.・

[Brief explanation of the drawing]

In the accompanying drawings, FIG. 1 is a cross-sectional view showing an example of the optical information recording medium of the present invention, FIG. K2 is a partial cross-sectional perspective view showing an example of the optical information recording medium of the present invention, and FIG. FIG. 1 is a cross-sectional view showing the actual HID optical information recording medium during production. DESCRIPTION OF SYMBOLS 1...Substrate, 2...Recording layer, 3...Reflection layer, 4...
...Light absorbing layer, 5... Photoresist layer, 6... Track (ml light part), 7... Oyakijimadan and 9 parts.

Claims (1)

[Claims] The track of the recording layer is a reflective layer] and the portion of the recording layer other than the track is a light storage layer. Distribution fIA media.