JPS6050732A - Optical disk type record carrier for recording and reproduction - 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 (Industrial Application Field) The present invention is applicable to recording signals such as video signals and audio signals on a recording thin film layer using laser light, and when reproducing the recorded signals using laser light. The present invention relates to an optical disk type record carrier for recording and reproduction.

(Structures of conventional examples and their problems) In recent years, optical video discs and audio discs have been developed in which a methacrylic resin layer or polycarbonate resin is injection molded or injection compression molded, and then a vapor-deposited metal layer and a protective layer are provided.
Con Guct Disc) has been released. The configuration of these optical discs will be explained based on FIG. 1.

Figure 1 shows the structure of a compact disc.
2 is an optically transparent resin base material having pits corresponding to signals, 2 is a vapor-deposited metal layer, and 3 is a resin protective layer. During playback, the narrowed laser beam hits the resin nozzle: 44'.
The light that passes through I and is modulated by the pits and reflected by the deposited metal layer 2 is read by a detector and reproduced as a signal. The quality of the disk is determined by the resin base 4'1, especially the resin base material 5'1 (material and composition) (11, 1:
The optical distortion in the resin base material 1 that occurs due to There is a demand for a material with even lower optical distortion caused by molding or foreign matter in the resin used as a base material.

For example, with playback-only optical video discs,
Some have pits that correspond to signals made of ultraviolet curing resin;
If the adhesion between the resin and the master (stamper) is too good, the signal surface will get smeared when it is peeled off, or in the worst case, the base material will be damaged, or the resin will be thin on the stamper surface. There is a problem with sticking. For this reason, it has a good closeness with the base, and it is also the first time to leave Stan Guto! There is a strong demand for ultraviolet-curable 11-type resins with excellent properties.

(Objective of the Invention) An object of the present invention is to provide an optical disk type record carrier for recording and reproducing which satisfies these demands, is free from manufacturing troubles, and has excellent quality.

(Structure of the Invention) The optical disk type record carrier for recording and reproduction of the present invention comprises an ultraviolet curable resin layer having a spiral or concentric guide groove on one side of an optically transparent and homogeneous resin base material, and a laser beam curable resin layer. A recording thin film layer whose optical state changes upon light irradiation and a resin protective layer are sequentially laminated, and the ultraviolet curable resin layer is composed of 2,2-bis(4-acryloyloxy) represented by the following structural formula. It is obtained by curing a resin composition containing polyethylene oxyphenyl) 30iRn, where m and n are integers, and m + n = 3 to 4.

(5) As a result, in the disc manufacturing process where guide grooves are formed, it is easy to peel off from the stun/P-, which improves work efficiency, and it is also suitable for the path of 1/-day light used for recording and reproducing signals. has extremely low optical distortion, and the ultraviolet curable resin composition can be purified by a simple method, such as by heating L1-
1) By leaving it for a while, it is possible to eliminate all foreign matter near the recording thin film layer, resulting in excellent quality records 1] Raw J1
] This is an optical disk type record carrier.

In order to modify the properties of the ultraviolet curable resin composition, various additives can be added to the ultraviolet curable resin composition in a manner that does not impair its releasability from the stamper. For example, before reactive crosslinking made of polyfunctional (meth)acrylic ester to improve heat resistance, liquid (I'l
Surfactants such as defoamers and wetting agents to improve wettability with gas, non-reactive thermoplastic resins to reduce curing shrinkage, and effective use of heat generated from lamps during ultraviolet irradiation. There are thermosetting catalysts such as organic peroxides.

(6) (Description of Embodiment) An embodiment of the present invention will be described based on FIGS. 2 and 3.

FIG. 2 is a sectional view of an optical disk type record carrier for recording and reproducing in one embodiment of the present invention. 3 is an optically transparent and homogeneous resin base material, 3 is a resin protection layer, 4 is an ultraviolet curable resin layer, and 5 is a recording thin film layer whose optical state changes when irradiated with a laser beam. The resin layer 4 is provided with guide grooves.

The resin base material 1 may be a transparent, optically homogeneous material, such as polymethacrylate resin, polycalf I? It is possible to use a sheet made of a thermosetting resin obtained as one component of a thermoplastic resin such as ester resin, a trifunctional or higher functional methacrylic acid ester, or a diallyl ester of an organic dicarbonate. can.

As the ultraviolet curable 4f+4 resin composition, 2,2-bis(4-acryloyloxydiethyleneoxyphenyl)
It contains 100 mt parts of propane and 2 parts by weight of benzyl dimethyl ketal. The recording thin film 1so 5 is made of a light-absorbing low oxide, such as low tellurium oxide Te (O(x (2,0)), whose main component is f
There is fi.

A manufacturing method for the recording/reproducing optical disc Kojiroku] 1j of this embodiment constructed as described above will be explained with reference to FIG.

Stamper 6 with spiral or concentric solid guide grooves
A liquid interleaf line-curing resin layer 4 that can be cured by ultraviolet irradiation is coated on a part or the entire surface of the substrate, and an optically transparent and homogeneous resin base A1 is coated on top of the layer 4. 7 so that the liquid resin has a uniform thickness. Next, the liquid resin is cured by irradiating the entire resin base material 1 with an ultraviolet lamp 8': ultraviolet light 9, and then the resin base material 1 is peeled off from the stun gun together with the cured resin 4 attached thereto. The disk is obtained by The obtained disc with the guide groove chair 1 is used as an optical disc type recording device 11 for recording and reproduction.
To make one body (l-1, tellurium low oxide T is recorded on the surface of the ultraviolet curable resin layer 4 having guide grooves +F film layer)
e0x (0<X<20) is provided by vacuum evaporation. Furthermore, as a resin protective layer 3 thereon, a sheet preferably made of the same material as the resin base material 1 is laminated to the recording thin film layer using an ultraviolet curable resin, and the resin is cured by ultraviolet irradiation and bonded. Alternatively, a resin solution dissolved in a solvent is applied to the surface of the recording thin film layer and dried. In this way, a single-sided recording/reproducing optical disk type record carrier is obtained.

By bonding recording thin film layers made of a low tellurium oxide together with a suitable Hiko adhesive, a double-sided recording/reproducing optical disk type record carrier can be obtained.

(Effects of the Invention) The optical disk type record carrier for recording and reproduction of the present invention has a manufacturing process in which guide grooves are formed using an ultraviolet curable resin composition.
The cured resin is easy to peel off from the stun gun,
Excellent workability. The moat has almost no optical distortion, for example, the base material is a cast plate of methacrylic resin, and the guide grooves are formed near room temperature with a liquid ultraviolet curable resin composition, so it is different from conventional thermoplastics. Compared to those obtained by injection molding of resin, there is almost no optical distortion (9
) Moreover, it has a fine guide groove at the pole V). In addition, since UV-curable resin compositions are in a liquid state before curing, it is possible to completely remove problematic foreign substances with particle sizes by clarifying them by pressure filtration or other means before use. (The optical disk type record 11 for recording/reproducing thus obtained)
One has the effect of providing extremely high quality that is not affected by optical weight or foreign matter.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional optical disk type record carrier for reproduction.
FIG. 2 shows an optical disc type recording 4r! for recording and reproducing according to an embodiment of the present invention! FIG. 3 is a sectional view showing one method of manufacturing the body. DESCRIPTION OF SYMBOLS 1... Resin substrate, 3... Resin protective layer, 4... Ultraviolet curable resin layer, 5... Recording film layer, 6... Stamper 17... Wave laser, 8... Ultraviolet lamp, 9
...Ultraviolet light. Patent applicant: Matsushita Electric Industrial Co., Ltd. - Agent: Hisashi Hoshino (10)

Claims (5)

[Claims] (1) A transparent plate is used as a base material, and an ultraviolet curable resin layer with a spiral or concentric guide groove on one side, a recording thin film layer whose optical state changes when irradiated with laser light, and a resin protective layer are sequentially formed. The ultraviolet curable resin layer has 2,2-bis(4
- An optical disc for recording and reproduction, which is obtained by curing a resin composition containing acryloyloxypolyethyleneoxyphenyl)pronotan.
3 However, m + n is an integer, m -1-n = 3 or 4 (1) (2) Is the transparent grade at least polymethacrylate resin +1? An optical disc type recording medium for recording and reproducing according to claim (1), characterized in that it is made of a recarbonate resin or the above-mentioned resin with an adhesive layer provided on its surface. (3) The transparent plate is made of a thermosetting resin obtained as one component of a trifunctional or higher functional methacrylic acid ester or a diallyl ester of an organic dicarboxylic acid, or the above resin with an adhesive layer provided on the surface. Features! 1.
! 1' An optical disc-type record carrier for recording and reproduction according to claim (1). (4) Recording thin film layer d1 whose optical state changes upon irradiation with laser light, low tellurium oxide T e OX(0(
A single optical disk type record carrier for recording and reproduction according to claim (1), characterized in that it is formed of a material whose main component is X<2(1). (5) A laminate consisting of a transparent grating, an ultraviolet curable resin layer, and a recording thin film layer (2 sheets of i7 are prepared, and the recording thin film layers of the two laminates are bonded together. An optical disk type record carrier for recording and reproducing according to any one of claims (1), (2), (2), (3), and (4).