JPH07192317A - Optical disk and its manufacture - Google Patents

Abstract

PURPOSE: To provide an optical disk whose manufacture is easy and in which reflection efficiency is considerably improved and to provide its manufacturing method. CONSTITUTION: A master 20 having a recording face is worked. A stamper 30 is formed on the master so that a surface corresponding to the recording face is given. The stamper is separated from the master and a resin layer 10 is formed on the stamper. A first reflection hologram film 13 which reflects only the laser beam of a prescribed wavelength and makes the laser beam of the remaining wavelength pass through is adhered on the resin layer. A transparent medium layer 14 is vapor deposited on the first reflection hologram film. A second reflection hologram film 16 which reflects only the layer beam of the other prescribed wavelength and makes the laser beam of the remaining wavelength pass through is adhered to the transparent medium layer. A transparent protection layer 19 is vapor deposited on the second reflection hologram film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk and a method for manufacturing the same, and more particularly to an optical disk using a reflection hologram film to improve reflection efficiency and a method for manufacturing the same.

[0002]

2. Description of the Related Art As shown in FIG.
Is a resin layer 2 having pits 3 formed on its upper surface.
And an aluminum reflective layer 4 formed on the resin layer 2,
And a protective layer 5 formed on the aluminum reflective layer 4.

In the conventional optical disc having the above-described structure, the pits 3 are formed on the upper surface of the resin layer 2, and the aluminum reflection layer 4 is formed on the resin layer 2 having the pits 3 by vapor deposition. It is manufactured by a method including a step of forming a protective layer 5 on the aluminum reflective layer 4.

[0004]

However, in such a conventional optical disc, since the aluminum reflective layer is formed by vapor deposition, the aluminum reflective layer is formed between the aluminum particles deposited in the process of vapor depositing the aluminum reflective layer. Since a pinhole defect that causes a gap occurs, it is difficult to uniformly form the aluminum reflection film, and expensive dedicated equipment for vapor deposition is required, resulting in a problem of high manufacturing cost.

Further, in the case of the double-sided disc, there is a problem that another mechanism for transporting the optical receiving device is required on all the both sides of the disc.

The present invention has been made in view of the above problems, and an object thereof is to provide an optical disk which is easy to manufacture and has a significantly improved reflection efficiency.

Another object of the present invention is to provide a method suitable for manufacturing an optical disc having a significantly improved reflection efficiency.

[0008]

In order to achieve the above-mentioned object, an optical disk according to the present invention comprises a resin layer having a recording surface and a resin layer which is adhered on the resin layer and reflects only a laser having a predetermined wavelength. Pass the remaining wavelength laser first
A reflective hologram film, a transparent medium layer deposited on the first reflective hologram film, and a transparent medium layer deposited on the transparent medium layer to reflect only lasers of other predetermined wavelengths and allow lasers of the remaining wavelengths to pass. A two-reflection hologram film and a transparent protective layer deposited on the second reflection hologram film.

Further, in the optical disc manufacturing method of the present invention, the step of processing a master having a recording surface and the step of forming the stamper on the master so as to have a surface corresponding to the recording surface, and then removing the stamper from the master. A step of separating, a step of forming a resin layer on the stamper, and a step of adhering a first reflection hologram film that reflects only a laser of a predetermined wavelength on the resin layer and allows the laser of the remaining wavelengths to pass therethrough, Depositing a transparent medium layer on the first reflection hologram film, and bonding a second reflection hologram film on the transparent medium layer, which reflects only the laser of the other predetermined wavelength and allows the laser of the remaining wavelength to pass through. And a step of depositing a transparent protective layer on the second reflective hologram film.

Therefore, according to the present invention, it is possible to easily manufacture an optical disk and to employ a low-power semiconductor laser in which the reflection efficiency of the optical disk is significantly improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific features of the present invention and the functions and effects thereof will be apparent from the following description of preferred embodiments with reference to the accompanying drawings.

As shown in FIG. 1, the optical disk according to the present invention includes a step of processing a master 20 having a recording surface 21 and a stamper 30 on the master 20 so as to have a surface 31 corresponding to the recording surface. After the formation, the step of separating the stamper 30 from the master 20 (FIG. 1A) and the step of forming the resin layer 10 on the stamper 30 (FIG. 1B).
And reflects only the laser of a predetermined wavelength on the resin layer 10,
A step of adhering the first reflective hologram film 13 through which the laser of the remaining wavelengths passes (FIG. 1C), a step of depositing a transparent intermediate layer 14 on the first reflective hologram film 13 (FIG. 1D), and a transparent intermediate layer 14 The step of adhering the second reflection hologram film 16 that reflects only the laser of the other predetermined wavelength and allows the laser of the remaining wavelength to pass therethrough (FIG. 1E), and the transparent protective layer 19 on the second reflection hologram film 16. Depositing (FIG. 1F).

The first reflection hologram film 13
Is formed so as to totally reflect only the wavelength of 780 nm which is the same as the laser wavelength currently used.

Therefore, as shown in FIG. 2, the optical disk of the present invention manufactured by such a method is bonded to the resin layer 10 having a recording surface and the resin layer 10, and only the laser I having a predetermined wavelength is irradiated. The first reflection hologram film 13 that reflects and transmits the laser of the remaining wavelengths, the transparent medium layer 14 vapor-deposited on the first reflection hologram film 13, and the transparent medium layer 14 are adhered to the first medium and the other predetermined wavelengths. A second reflective hologram film 16 that reflects only the laser II and allows the lasers of the remaining wavelengths to pass through, and a transparent protective layer 19 deposited on the second reflective hologram film 16.
Including and

The reflection hologram film 13 is
As shown in FIG. 3, a plane wave having a wavelength of 780 nm is film-scanned against the photographic emulsion 35 so as to impinge upon each other, and is produced using the interference between the two plane waves. Since such a method of manufacturing a reflection hologram film is known, detailed description thereof will be omitted.

[0016]

As described above, according to the optical disk of the present invention and the method of manufacturing the same, the number of reflection hologram films capable of reflecting each of them depending on the wavelength of light incident on the optical disk from the laser is increased in one disk. Since the layers are formed, information of several layers can be recorded and read from one disc.

[Brief description of drawings]

FIG. 1 is a process diagram illustrating a method for manufacturing an optical disc according to the present invention.

FIG. 2 is a sectional view showing a partially enlarged view of an optical disc according to the present invention.

FIG. 3 is a schematic view illustrating a method of manufacturing a reflection hologram film for an optical disc according to the present invention.

FIG. 4 is a cross-sectional view showing a partially enlarged conventional optical disc.

[Explanation of symbols]

 10 Resin Layer 13 First Reflection Hologram Film 14 Transparent Medium Layer 16 Second Reflection Hologram Film 19 Transparent Protective Layer 20 Master 30 Stamper

Claims (4)

[Claims] 1. A step of processing a master having a recording surface; a step of forming a stamper on the master so as to have a surface corresponding to the recording surface, and then separating the stamper from the master; A step of forming a resin layer on the first reflection hologram film, and a step of adhering a first reflection hologram film on the resin layer, the first reflection hologram film reflecting only a laser having a predetermined wavelength and allowing the laser having the remaining wavelength to pass therethrough. Depositing a transparent medium layer, adhering a second reflective hologram film that reflects only a laser having a predetermined wavelength and allows the other wavelength lasers to pass through the transparent medium layer, the second reflective hologram film Depositing a transparent protective layer on the optical disc. 2. The first reflection hologram film is 78
2. The method of manufacturing an optical disc according to claim 1, wherein the optical disc is formed so as to totally reflect only a wavelength of 0 nm. 3. A resin layer having a recording surface, a first reflection hologram film which is adhered onto the resin layer and reflects only a laser of a predetermined wavelength and allows a laser of the remaining wavelength to pass through, the first reflection hologram. A transparent intermediary layer deposited on the film, and a transparent intermediary layer adhered on the transparent intermediary layer, which reflects only lasers of other predetermined wavelengths and passes lasers of the remaining wavelengths.
An optical disc comprising a reflective hologram film and a transparent protective layer deposited on the second reflective hologram film. 4. The first reflection hologram film is 78
The optical disk according to claim 3, wherein the optical disk is formed so as to totally reflect only a wavelength of 0 nm.