JPH1131339A - Optical disk and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an atractive optical disk as an article by effectively using an optical disk outer peripheral part and the manufacture of the optical disk manufacturing this optical disk at a low cost. SOLUTION: The optical disk 1 is provided with a central hole 2 for fitting on its central part and a data storage area 3 of a hollow circular shape on the inner peripheral part, and pits are formed on this data storage area 3. A light reflection film 5 covers the data storage area 3, and is formed discontinuously with the data storage area 3 so that a required pattern is constituted on the optical disk outer peripheral part further outward from that. The light reflection film 5 is formed by vapor depositing metal such as aluminum, etc., on a part not covered with an inner mask and an outer mask.

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 an optical disk, and more particularly, to an optical disk having a desired pattern formed by a light reflecting film and a masking method for forming the desired pattern on the optical disk. The present invention relates to a method for manufacturing an optical disk in which a light reflection film is partially formed by using the method.

[0002]

2. Description of the Related Art Conventionally, as an optical disk of this type, C
D (compact disk) is known, and the CD standard specifies CD disks having a diameter of 12 cm and a diameter of 8 cm. FIG. 1 is a plan view showing a conventional optical disk.

[0003] 1 is an optical disk having a diameter of 12 cm,
It has a center hole 2 for attachment at the center and a data storage area 3 covered with a hollow circular light reflecting film having a diameter of 8 cm on the inner circumference. Pits are formed in the data storage area 3. I have. Reference numeral 4 denotes an outer peripheral portion of the optical disk,
Generally, it is colorless and transparent. The optical disk 1 is finally completed as a commercial optical disk by attaching a label to the surface opposite to the light irradiation surface.

[0004]

However, in the conventional optical disk, as described above, the outer peripheral portion 4 of the optical disk is colorless and transparent, has no impact on the purchaser of the optical disk, and is not attractive as a commercial product. . SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. By forming a pattern on the outer peripheral portion 4 of an optical disc, which is not used in a conventional optical disc, and making effective use of the pattern, an optical disc full of attractiveness as a product and low cost can be obtained. Accordingly, it is an object of the present invention to provide a method of manufacturing an optical disc that can easily form the pattern.

[0005]

According to a first aspect of the present invention, there is provided an optical disk on which a light reflecting film is formed, wherein data is recorded on an inner peripheral portion of the optical disk. The light reflecting film includes a stored data storage area, and the light reflection film covers the data storage area and forms a desired pattern.

According to a second aspect of the present invention, in the optical disk according to the first aspect, the data storage area is covered with a hollow circular light reflecting film, and a desired area is provided outside the data storage area. A light reflection film constituting a pattern is formed. According to a third aspect of the present invention, in the method of manufacturing an optical disc having a light reflecting film formed thereon, a mask for partially forming the light reflecting film is attached to the light reflecting film forming surface of the optical disc. A first step, a second step of partially forming a light reflecting film on the light reflecting film forming surface of the optical disc to which the masking has been attached in the first step, and a light reflecting film being partially formed by the second step. Removing the masking from the light reflecting film forming surface of the optical disc formed, and the light reflecting film formed on the light reflecting film forming surface of the optical disc through the first to third steps is a desired one. It is characterized by constituting a pattern.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the following terms are defined for convenience of explanation. (1) The “desired pattern” is not a hollow circular pattern formed by a light reflection film necessary for a signal reproducing function covering a data storage area of an optical disk, but is intentionally added to a pattern other than the hollow circular pattern. The light reflection film to be formed is integrated with the hollow circular pattern or a pattern formed independently of the hollow circular pattern.

An embodiment of the present invention will be described below in detail with reference to the drawings. In the drawings, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated. FIG. 2 is a plan view showing an optical disk according to the present invention. In FIG. 2A, reference numeral 5 denotes a light reflecting film, which is formed on the optical disc 1 and covers the data storage area 3 shown by a broken line and forms a desired pattern. In this case, a star-shaped hexagonal pattern is configured. However, for example, a snowflake pattern or a pattern indicating a character may be configured instead of a star-shaped hexagon.

The light reflection film 5 is formed so as to form a desired pattern on the data storage area 3 in a hollow circular shape indicated by a broken line and outside the data storage area 3. However, the broken line is not actually visible as shown in FIG.
FIG. 3 is a plan view showing an optical disc according to the present invention.
The light reflection film 5 covers the data storage area 3 and is formed discontinuously with the data storage area 3 so as to form a desired pattern on the outer peripheral portion 4 of the optical disk outside the data storage area 3.
In this case, four star-shaped pentagonal patterns are formed. For example, crescent shapes are alternately inserted between the four star-shaped pentagons to form various patterns according to the purpose of the optical disk. Is also possible.

Next, a method for manufacturing an optical disk according to the present invention will be described in detail with reference to the drawings. FIG. 4 is a plan view showing a change of the optical disc according to the first step of the optical disc manufacturing method according to the present invention. In FIG. 4A, reference numeral 1 denotes an optical disc having a diameter of 12 cm, which has a center hole 2 for mounting in a central portion and optically readable pits (not shown) formed on the surface thereof.

In FIG. 4B, reference numeral 6 denotes an inner mask, which covers the inner peripheral portion of the optical disk. Reference numeral 7 denotes an outer mask, which covers the outer peripheral portion of the optical disc and forms a desired pattern so that a light reflection film to be deposited later forms a desired pattern.
In this case, a star-shaped pentagonal pattern hole is partially formed.

FIG. 5 is a plan view showing the change of the optical disk in the second and third steps of the method for manufacturing an optical disk according to the present invention. FIG. 5A shows the optical disc in the second step, and a light reflection film 5 painted black in the figure is formed by vapor deposition on a portion not covered by the inner mask 6 and the outer mask 7.

FIG. 5B shows the optical disc in the third step, and the inner mask 6 and the outer mask 7 are shown.
Has been removed. The light reflection film 5 covers the data storage area 3 in a hollow circular shape, and further forms a star-shaped pentagonal pattern on the outer peripheral portion 4 of the optical disc outside the data storage area 3.

Through these steps, after a transparent protective layer is formed on the light reflecting film 5 through these steps, a label is attached to the optical disk 1 to complete the optical disk product.

[0015]

As described above, according to the optical disk of the present invention, a desired pattern is formed on the outer periphery of the transparent optical disk and is effectively used, so that the optical disk product is very attractive to the purchaser. As a result, a significant increase in sales is expected. Further, according to the method for manufacturing an optical disc according to the present invention, the pattern is formed on the optical disc by the light reflecting film using the mask used for forming the light reflecting film, so that the optical disc can be manufactured at low cost. It can be manufactured.

[Brief description of the drawings]

FIG. 1 is a plan view showing a conventional optical disc.

FIG. 2 is a plan view showing an optical disc according to the present invention.

FIG. 3 is a plan view showing an optical disc according to the present invention.

FIG. 4 is a plan view showing a change of the optical disk in a first step of the method for manufacturing an optical disk according to the present invention.

FIG. 5 is a plan view showing a change of the optical disc in a second step and a third step of the method for manufacturing an optical disc according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Center hole 3 Data storage area 4 Optical disk outer peripheral part 5 Light reflection film 6 Inner mask 7 Outer mask

Claims (3)

[Claims] 1. An optical disc having a light reflection film formed thereon, comprising: a data storage area in which data is stored in an inner peripheral portion of the optical disc; wherein the light reflection film covers the data storage area;
An optical disc comprising a desired pattern. 2. The optical disk according to claim 1, wherein the data storage area is covered with a hollow circular light reflection film, and a light reflection film forming a desired pattern is formed outside the data storage area. An optical disc characterized by the following. 3. A method for manufacturing an optical disk having a light reflecting film formed thereon, wherein: a first step of attaching a mask for partially forming a light reflecting film on a light reflecting film forming surface of the optical disk; A second step of partially forming a light-reflecting film on the light-reflecting film-formed surface of the optical disk to which the masking is attached; Removing the masking from the forming surface, wherein the light reflecting film formed on the light reflecting film forming surface of the optical disk through the first to third steps constitutes a desired pattern. Manufacturing method of an optical disk.