JPS62183047A - Production of optical recording medium - Google Patents

Abstract

PURPOSE:To easily form guide grooves with high accuracy by forming the grooves corresponding to the guide grooves on a substrate and forming the guide grooves on a recording layer based on said grooves. CONSTITUTION:A photoresist layer 6A is formed on the surface of the substrate 3 made of plastic. The resist layer 6A is exposed through an optical mask 7 having the pattern corresponding to the guide grooves for tracking by using an exposing device and the uncured part is removed to form the layer 6 which is part of the substrate 3 having the grooves 6a corresponding to the guide grooves. The recording layer 4 for a video signal and sound signal is deposited and formed on the surfaces of the substrate 3 and the layer 6 and a protective layer 5 is deposited and formed on the recording layer 4, by which an optical recording disk is obtd. the optical recording disk formed with the guide grooves GV and land parts LD which are respectively concentrical or nearly concentrical on the recording layer 4 is thus obtd.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing an optical recording medium.

[Summary of the invention]

The present invention relates to an optical recording medium, in which a photoresist layer is deposited on a substrate, and the photoresist layer is applied to a recording medium of the optical recording medium. A groove corresponding to the guide groove is formed on the substrate by exposure through an optical mask with a pattern corresponding to the guide groove to be formed in the two layers and a development process, and a guide groove is formed in the recording layer based on this groove. By forming the guide grooves, highly accurate guide grooves can be easily formed in the recording layer of the optical recording medium.

[Conventional technology]

First, a conventional method for manufacturing an optical recording disk will be explained with reference to FIG. Prepare a master disk (glass master disk) (1) and use a laser beam to form grooves (concentric circles or circles) corresponding to guide grooves for trunking to be formed in the recording layer of the optical recording disk. A spiral similar to ?M
)(la) is formed on the surface of the master (1) (Fig. 3B).
). A stamper (2) is formed by plating the surface of this master (1) with metal (nickel) (FIGS. 3C and D). Prepare the substrate (3) of the optical recording disk (made of plastic) (Fig. 3E) and stamp it with a standber (2) to form a recording layer on the surface of this substrate (3). A groove (3a) corresponding to the guide groove is formed (FIG. 3F). A recording layer (layer where information signals such as video signals, audio signals, data signals, etc. are optically recorded) is formed on the surface of this substrate (3).
(4) is deposited (FIG. 3G), and a protective layer (5) made of Boolastic is deposited thereon to obtain an optical recording disk (FIG. 3FI). . . . Nearby, guide grooves GV and land portions LD each having a concentric circle or a nearly circular jMi winding are formed in the recording layer (4), thereby obtaining a chisel optical recording disk.

[Problems that the invention attempts to solve]

In such a conventional optical recording disk manufacturing method, the grooves (1a) of the master (1) for forming the stamper (2) were formed using a laser beam.
1) to form a stamper (2), and this stamper (
2), grooves (3a
), it was not possible to form the guide groove GV with high precision.

In view of this point, the present invention includes a recording layer of an optical recording medium,
The present invention attempts to propose a method for manufacturing an optical recording medium that can easily form guide grooves with a high density.

Means for Solving Problem C] Method for manufacturing an optical recording medium according to the present invention (l: A photoresist layer (6A) is deposited on the substrate (3) or (1), and the photoresist layer (6A) is formed on the substrate (3) or (1). The resist layer (6A) is exposed to light through an optical mask (7) with a pattern corresponding to the guide grooves G to be formed in the recording layer (4) of the optical recording medium, and is developed and processed to form the substrate 3. ) or (1) guide groove G on top
A groove (6a) corresponding to V is formed, and a guide groove GV is formed in the recording layer (4) based on this groove (6a).

[Effect]

According to the present invention, a photoresist ff1 (6A) is formed on the substrate (3) or (1), and this photoresist Fi (6A) is exposed to light through an optical mask (7) and developed. Processed and guided onto substrate (3) or (1)? A groove (6a) corresponding to X4GV is formed, and this groove (6a)
Guide grooves GV are formed in the recording layer (4) based on a).

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG. Prepare a substrate (made of plastic) (3) (Fig. 1A) and coat its surface with a photoresist layer (6A).
) is deposited (FIG. 1B). An optical mask using an exposure apparatus for semiconductor manufacturing and having a pattern corresponding to a guide groove for tracking to be formed in a recording layer of an optical recording disk so as to face this photoresist m (6A) (7) A photoresist 7m (6A) is exposed through this optical mask (7) (FIG. 1C).

L indicates the light for the exposure. Then, this foot resist layer (6A) is developed and its uncured portions are removed to form a layer (6A) that becomes a part of the substrate (3) and has grooves (6a) corresponding to the guide grooves. ) to form (first
Figure D). Over the surface of this substrate (3) and layer (6),
A recording layer (recording 1 in which information signals such as video signals, audio signals, data signals, etc. are optically recorded) (4) is deposited (FIG. 1E). A protective layer (5) is formed on this recording layer (4) to obtain an optical recording disk (FIG. 1F).

(Thus, an optical recording disk is obtained in which the recording layer (4) is formed with concentric or nearly circular spiral guide grooves G and land portions LD. According to this embodiment, no stamper is used. Thus, it is possible to mass-produce optical recording disks in which highly accurate guide grooves are formed in the recording layer.

Next, another embodiment of the present invention will be described with reference to FIG. Prepare the master disc (glass master disc) (1) (Fig. 2 A)
, a photoresist layer (6A) is deposited on its surface (FIG. 2B). Using an exposure apparatus for semiconductor manufacturing, an optical mask having a pattern corresponding to the guide groove for tracking to be formed in the recording S'AN of the optical recording disk is formed so as to face the photoresist layer (6A). (7)
The photoresist layer (6A) is exposed through this optical mask (7) (FIG. 2C). L indicates light for exposure. Then, by developing this photoresist layer (6A) and removing its uncured portion, a layer (6) that becomes a part of the master (1) is formed, which has grooves (6a) corresponding to the guide grooves. (Fig. 2D). This master (1)
and plating the entire surface of the layer (6) to form a stand bar (2) (FIGS. 2E and F).

After this, similarly to the conventional example described above, the substrate (made of plastic) (3) of the optical recording disk is used for the third time.
This is stamped with a standber (2) to form grooves (3a) on the surface of the substrate (3) corresponding to the guide grooves to be formed in the recording layer (Fig. 3F). A recording layer (4) is deposited on the surface of this substrate (3) (Fig. 3G), and a protective layer (made of plastic) (5) is deposited thereon to obtain an optical recording disk. (Figure 3H). In this way, an optical recording disk is obtained in which the recording layer (4) is formed with a concentric circle or a nearly circular spiral guide iGV and a land portion LD, respectively. In this embodiment, optical recording disks having highly accurate guide grooves formed in the recording layer can be mass-produced by stamping the substrate using a stamper.

Incidentally, the present invention can also be applied to a method of manufacturing an optical recording card.

〔Effect of the invention〕

According to the present invention described above, the recording layer of the optical recording medium includes:
It is possible to obtain a method for manufacturing an optical recording medium in which highly accurate guide grooves can be easily formed.

[Brief explanation of drawings]

FIGS. 1 and 2 are process diagrams showing each embodiment of the present invention, and FIG. 3 is a process diagram showing a conventional example. (3) and (1) are the substrate and master disc as the base, respectively, (
4) is a recording layer, (5) is a protective layer, (6) is a layer forming part of the base, (6A) is a photoresist layer, (6a) is a groove,
(7) is an optical mask. Figure 1 Figure 2

Claims (1)

[Claims] Forming a photoresist layer on a substrate, exposing the photoresist layer to light through an optical mask having a pattern corresponding to the guide groove to be formed in the recording layer of the optical recording medium, and developing the photoresist layer, A method for manufacturing an optical recording medium, characterized in that a groove corresponding to the guide groove is formed on the substrate, and a guide groove is formed in the recording layer based on the groove.