JPH0244550A - Production of magneto-optical disk - Google Patents

Abstract

PURPOSE:To automatically control an interval at the time of joining and to easily execute production by using a transferring mold and executing the production of a disk substrate. CONSTITUTION:The production of a disk substrate 5 is executed by using a transferring mold 20 to have plural recessing parts 6, for which depth H is larger than forming depth (h) of a recording surface forming part 16 and each depth H is made equal, in a spot excepting for the recording surface forming part 16 of a stamper 15 in the disk substrate 5. Thus, when the production of the disk substrate 5 is executed by using the stamper 15, an ultraviolet ray setting resin layer 2 invades into the recessing part 6 in the stamper 15 side by the pressure of the stamper 15 and a projecting part 7 is generated. When the disk substrate 5 is joined, this projecting part 7 and the projecting part 7, which is formed on the opponent side disk substrate 5, play the role of a spacer.

Description

[Detailed Description of the Invention] [1 Already Required] Regarding a method for manufacturing a magneto-optical disk made by bonding a pair of disk substrates facing each other, the distance between the recording surfaces of each bonded disk substrate and the distance between the recording surfaces of the magneto-optical disk The objective is to develop a method for manufacturing magneto-optical disks that makes it possible to manufacture magneto-optical disks whose total thickness is equalized in each part.
, at a location other than the recording surface forming portion of the stamper, the depth thereof is greater than the forming depth of the recording surface forming portion.

In addition, the disk substrate is manufactured using a transfer mold having a plurality of four parts, each of which has an equal forming depth.

[Industrial application field]

The present invention relates to a method for manufacturing a magneto-optical disk by bonding a pair of disk substrates facing each other.

(Prior Art) FIGS. 4(al), (bl, (C), (d), and (e) are side sectional views of main parts showing the conventional manufacturing process of a magneto-optical disk in the process order side.

Hereinafter, a conventional method for manufacturing a magneto-optical disk will be explained using FIGS. 4(a) to 4(e).

(1) Preparation of transfer mold [Fig. 4(a)] A stamper 15 made of a nickel plate with a recording surface forming portion 16 formed on its surface.
A transfer mold 20 is manufactured by joining the base plate and a pace plate 14 made of an aluminum plate or the like.

In the figure, 8 is a center hole formed in the center of the transfer mold 20.

(2) Formation of recording surface [Fig. 4 fb), fcl,
(dl) The transfer mold 20 is positioned as shown in FIG. 4(b) on the disk substrate 5 (see FIG. 4(C)) composed of a glass plate 1 and an ultraviolet curing resin layer 2. Then, it is moved in the direction of arrow A to press the ultraviolet curing resin layer 2 side of the disk substrate 5. As a result, a recording surface 3 as shown in FIG. 4(d) is formed on the disk substrate 5.

(3) Formation of a magneto-optical disk [FIG. 4(C)] A pair of disk substrates 5, each having a recording surface 3 formed thereon by the above operation, are now brought into a state in which the recording surfaces 3 are opposed to each other. Then, adhesive 4 is supplied between these disk substrates 5.

(4) Next, these disk substrates 5 are pressed from both the arrow A direction and the arrow B direction. As a result, Figure 4 (G
) A magneto-optical disk 10 is formed as shown in FIG.

Note that each step shown in FIG. 4 (al to el) above is as follows:
This is carried out using a manufacturing device not shown.

[Problem to be solved by the invention]

However, in the magneto-optical disk 10 manufactured by the above conventional method, since there is nothing to regulate the distance t between the disk substrates 5, the thickness of the adhesive 4 cannot be determined. There was also a problem in that the overall thickness T of No. 10 also varied locally (thickness T varied locally).

The present invention has been made in order to solve the problems with conventional magneto-optical disks, and is characterized by a disk structure in which the distance t between the disk substrates 5 is automatically regulated. There is.

[Means to solve the problem]

As shown in the embodiment diagram in FIG. 1, the method for manufacturing a magneto-optical disk according to the present invention is such that a stamper 15, which is the original form for manufacturing a disk substrate 5, has a depth H at a location other than the recording surface forming portion 16. A plurality of recesses 6 which are larger than the formation depth h of the recording surface forming portion 16 and whose respective depths H are equalized.
The disk substrate 5 is manufactured using a transfer mold 20 having the following.

[For production]

When a disk base (reverse 5) is manufactured using such a stamper 15, the ultraviolet curing resin M2 that bulges due to the suppression of the stamper 15 enters the recess 6 on the stamper 15 side, and the first A convex portion 7 as shown in Figure (C1) is generated. This convex portion 7 and the convex portion 7 formed on the mating disk substrate 5 serve as a spacer when the disk substrates 5 are joined. Therefore, by applying the present invention, the distance t between the disk substrates 5 and, therefore, the thickness T of the magneto-optical disk 10 can be automatically and accurately controlled.

〔Example〕

EMBODIMENT OF THE INVENTION The present invention will be described in detail below based on embodiment figures.

FIGS. 1(a), (b), (C1, and +d) are side sectional views of essential parts showing one embodiment of the present invention.
The same parts as those in the figure are given the same reference numerals.

As shown in FIGS. 1(a) to 1(d), in the method for manufacturing a magneto-optical disk according to the present invention, each of the magneto-optical disks has an equalized depth, and the depth H is the same as that of the recording surface forming portion 16. depth h
The configuration is such that the disk substrate 5 is manufactured using a transfer mold 20 having a plurality of recesses 6 larger than the size shown in FIG.

The structure and operation of the transfer mold, which is a feature of the present invention, will be described below.

As shown in FIG. 1 (al), the transfer mold 20 according to the present invention has a depth I (
A plurality of recesses 6 (in this embodiment, the recesses 6 are provided in the form of grooves on the outer circumferential side and the inner circumferential side of the stamper 15, respectively) are larger than the depth h of the recording surface forming portion 16. ). Therefore, when the transfer mold 20 is pressed against the disk substrate 5 [FIG. 1 (see BL)] from the six directions of arrows,
The ultraviolet curing resin layer 2 on the side of the disk substrate 5 rises and enters the recess 6, and a convex portion 7 formed by the sputtered film 2 is formed therein.
[see FIG. 1 (C1)]. Since this convex portion 7 is the determining factor for determining the distance t between the pair of disk substrates 5, the height of this convex portion 7, that is, the above-mentioned By adjusting the depth ■ of the recess 6, the disk substrate 5
By increasing the distance between them, the thickness T of the disk substrate 5 can be freely controlled. FIG. 1 (dl is a sectional side view of a main part showing a magneto-optical disk 10 manufactured in this manner.

FIGS. 2(a) and 2(b) are a side sectional view and a front view of a main part showing a first application example of the present invention.

In this application example, the recesses 6 formed on the side of the transfer mold 20 are arranged at intervals (including the part indicated by the two-dot chain line in the figure), and therefore the disk manufactured using the transfer mold 20 is Since the substrate 5 has a gap between each convex part 7, the adhesive 4
There is no possibility of secondary damage caused by being trapped inside.

FIGS. 3A and 3B are a side sectional view and a front view of main parts showing a second application example of the present invention.

In this second application example, the recess 6 on the transfer mold 20 side is a stamper.
Although it differs from the first application example in that it is formed at the outer and inner periphery of 15 at the same intervals (including the part indicated by the two-dot chain line in the figure), the effect is almost the same. there were.

〔Effect of the invention〕

In the disk manufacturing method according to the present invention, the transfer mold, which is the original form of the disk substrate, has the function of adjusting the spacing between the disk substrates, so that the disk substrate manufactured using this transfer mold can be bonded. Since the spacing can be automatically controlled during the process, there is an excellent industrial effect in that highly reliable magneto-optical disks can be easily manufactured.

[Brief explanation of the drawing]

Figure 1 (a), (bl, (C1, and +d) are side sectional views of main parts showing one embodiment of the present invention, Figure 2 (al and (bl) are side sectional views showing the first application example of the present invention. A side sectional view and front view of the main part, Fig. 3 (al and (bl) are a side sectional view and front view of the main part showing the second application example of the present invention, Fig. 4 (al, (bl, (cl, (bl) di and (el) are main part side sectional views showing the manufacturing process of a conventional magneto-optical disk. 5 is a disk base (reverse), 6 is a recessed part, 7 is a convex part, 8 is a central hole, 10 is a magneto-optical disk 14 is a base plate, 15 is a stamper, 16 is a recording surface forming section, 20 is a transfer mold, I (is the depth of the concave portion on the stamper side, h is the depth of the recording surface forming section, and T is a magneto-optical disk. , and t is the distance between the pair of disk substrates. In the figure, 1 is a glass plate, 2 is an ultraviolet curing resin layer, 3 is a recording surface, 4 is an adhesive, and t is a distance between a pair of disk substrates. Figure 3

Claims (1)

[Claims] A stamper (15) having a recording surface forming part (16)
is pressed against the ultraviolet curing resin layer (2) of the disk substrate (5) to form a recording surface (3) on the disk substrate (5), and then a film is formed, and the recording surfaces (3) are made to face each other. In the method for manufacturing a magneto-optical disk, in which a magneto-optical disk (10) is manufactured by bonding these together using an adhesive (4), the stamper (15) is provided with a portion other than the recording surface forming portion (16). A plurality of recesses (6) each having a depth (H) greater than the formation depth (h) of the recording surface forming portion (16) and each having an equal depth (H) is provided. A method for manufacturing a magneto-optical disk, characterized in that a disk substrate (5) is manufactured using a transfer mold (20).