JPS63298730A - Production of optical disk - Google Patents

Abstract

PURPOSE:To eliminate bleeding out of an adhesive agent by changing the respective shapes of two sheets of substrates constituting a disk so that the adhesive agent is coated at a specified amt. CONSTITUTION:The outside circumferential part at the sticking face (A face) 5 of a 1st disk substrate of two sheets of the disk substrates 1 is formed lower by one step than the central part and the outside circumferential part at the sticking face (B face) 6 of the remaining 2nd disk substrate is formed higher by one step than the central part; in addition, a groove is formed at the boundary part between this outside circumferential part and the central part. The adhesive agent 3 is coated in the central part on the A face 5 and after the adhesive agent 3 is coated in both the outside circumferential part and the central part with the groove in-between on the B face 6, the A, B faces are stuck to each other and the excess adhesive agent 3 except the agent required for this sticking is admitted into the groove. The bleeding out of the adhesive agent is thereby obviated.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for manufacturing an original disk, and more particularly, to a method for manufacturing an optical disk suitable for improving the quality of adhesive application management.[Prior Art] Conventional method As described in the Japanese Patent Publication No. 58-6557, the disks can be bonded together using a hot-melt adhesive using a roll coater, and it is an adhesive method that is excellent in terms of heritability and six qualities. However, the amount of adhesive applied and the structure of the disk are not considered, and the current situation is that the adhesive often oozes out.

[Problem that the invention seeks to solve]

In the conventional technology described above, no consideration was given to the structure of the disk or the cover for applying the adhesive, and the adhesive protruding from the end surface impairs the workability of the subsequent process. [Means for solving the problem] The purpose of the above is to provide a method for manufacturing the original disk that prevents the adhesive from extruding, etc.0 [Means for solving the problem] They are coupled by changing the shape of each and keeping the amount of adhesive applied constant.

[Effect]

By providing unevenness on each adhesive surface of the two substrates that make up the disk, a space is provided for the adhesive to flow into, thereby eliminating the possibility of the adhesive protruding. , will be explained with reference to drawings. FIG. 1 is a diagram showing R after applying adhesive in the optical disc manufacturing method according to the present invention.

1 is a disk substrate such as PMMA, 2 is a protective film, and 3 is an adhesive. 4 indicates a roll coater for applying adhesive.

FIG. 2 shows the state after adhesive application and before bonding.

A disk is constructed by bonding two substrates together, with side A serving as the first substrate and side A serving as the second substrate.
Since there is a B constraint as a substrate, if 5 is the A side and 6 is the B side, if the outer periphery is removed like 8th side 6, no adhesive will be applied to the outer periphery. Side A 5 has a protrusion due to the depression of the outer peripheral portion of side 8, but there is no shadow when coated with a roll coater. The reason for pasting these together is shown in Figure 3. A cavity will be created at 7, and the adhesive will flow here. Also, since there is not much adhesive on the outer periphery,
Even if the 8 portions of the cut surface on the outer periphery are lathe-processed, it is possible to avoid the adhesive from sticking to the teeth and deteriorating the performance, and the amount of adhesive that spills out is considerably reduced.

〔Effect of the invention〕

According to the present invention, the rate at which the adhesive protrudes from the end surface of the disks after bonding can be reduced to 50% or less, reducing unnecessary work such as wiping off the adhesive after the packaging process and improving quality. be.

[Brief explanation of drawings]

Fig. 1 is a front view showing the adhesive application step in the manufacturing method according to the present invention, Fig. 2 is a cross-sectional view of the A-side, 8-sided disk before lamination, and Fig. 3 is a cross-section of the disk after lamination. It is a diagram. 1... Disk substrate 2... Protective film 3... Adhesive 4... Roll coater 5... A side
6...3 sides 7...hollow 8...
Cutting surface Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 or 2 disk substrates are bonded together using an adhesive.
In the method for manufacturing an optical disk, the outer circumferential portion of the bonding surface of the first disk substrate of the two disk substrates is formed one step lower than the center portion, and the remaining second disk substrate The outer periphery of the bonding surface of the first disk substrate is formed to be one step higher than the center, and a groove is formed at the boundary between the outer periphery and the center. After applying an adhesive, and applying adhesive to both the outer peripheral part and the central part with the groove in between on the bonding surface of the second disk substrate, the bonding surfaces of both disk substrates are bonded to each other. A method for manufacturing an optical disk, characterized in that excess adhesive other than that required for bonding is allowed to flow into the groove.