JPH01273249A - Method of sticking magneto-optical disk - Google Patents

Abstract

PURPOSE:To prevent bleeding out of an adhesive liquid to substrate surfaces by installing a positioning pin which has hollow grooves for housing the excess adhesive agent on the outside peripheral face to the central part of two sheets of substrates via the adhesive agent so as to align the same to the center of the substrates, then exerting load thereon to form above and press-welding the substrates. CONSTITUTION:The positioning pin 10 having the hollow grooves 11 for housing the excess adhesive agent on the outside peripheral face is used. The excess adhesive agent is accumulated in these hollow grooves 11 in case of inserting thin pin 10 into the pin insertion holes of the magneto-optical disk substrates 5, 5' and press-welding the substrates between a glass plate 2 and a glass disk 6 by the adhesive agent 8. The bleeding of the excess adhesive agent to the surface side of the optical disk and the sticking thereof to the surface thereof are prevented. The hollow grooves 11 act also as vent holes communicating with the outside at the time of sticking and the air escapes through the grooves if the hollow grooves 11 are formed in the axial direction of the pin 10. The sticking with the high adhesiveness is thus executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for bonding magneto-optical disks, and in particular, to a mounting plate having protruding pins for positioning a disk substrate.
A method of attaching magneto-optical disks that solves the problem caused by excess adhesive in a method in which two magneto-optical disk substrates are placed one on top of the other with an adhesive and a load is applied from above to bond both substrates together. Regarding the matching method.

[Prior Art] Magneto-optical disks are a type of optical disk that uses light (laser) to record and reproduce information, but because they use magnetic materials as recording materials, they can be erased and re-recorded, unlike ordinary optical disks. In recent years, research and development has been actively carried out in anticipation of applications in various fields.

Magneto-optical disks are made of TbFeCo, GdT, etc. on a transparent substrate such as polycarbonate resin, acrylic resin, or glass.
A recording layer such as bFe, or a reflective layer, an optical layer, a reproduction layer, etc. are formed. Conventionally, two disk substrates are combined with a recording layer for the purpose of protecting the recording layer and high-density recording. Those with a structure in which they are bonded symmetrically on the inside are widely used.

Conventionally, such a magneto-optical disk is placed on a mounting plate (usually a glass plate) 2 on which a cylindrical bin 1 for positioning the disk substrate is protruded, with a recording layer on one side, as shown in FIG. 3
．． Two magneto-optical disk substrates 5, 5' each having an angle 3' and a bottle insertion hole 4, 4' in the center are placed on a recording layer 3'.
, 3° are on the inside, and position the bottle 1 by inserting it into the bottle insertion hole 4.4', and then inserting the pin insertion hole 6a of the glass disk 6 into the pin insertion hole 6a. The glass disk 6 is manufactured by passing a pin 1 through the glass disk 6 and applying a load 7 from above through the holding plate of the glass disk 6 to press the glass disk 6 into place.

In addition, conventionally, the mounting plate 2 usually has a thickness of 5 m.
A glass plate or the like with a diameter of about m is used.

[Problems to be Solved by the Invention] In such a conventional method, when applying pressure and bonding, excess adhesive protrudes from the bonding surface between the two disk substrates 5. The adhesive passes between the inner wall surface of the pin insertion hole and the bottle, and adheres to the outer surface of the bonded magneto-optical disk. As a result, the surface of the product is contaminated with the adhesive, which poses a problem in that post-treatment after the adhesive treatment is not easy.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and provide a method for bonding magneto-optical disks that prevents the adhesive that has protruded from adhering to the surface of the product.

[Means for Solving the Problems] The magneto-optical disk bonding method of the present invention comprises: a magneto-optical disk substrate having a magneto-optical recording layer and an opening formed in the center; A method of bonding another board of the same shape with an adhesive, in which a pin is provided with an outer diameter that matches the opening in the center of the board and a recess formed on the outer surface. The method is characterized in that two substrates are placed on the mounting plate with an adhesive between them by inserting an opening into a bottle of the mounting plate, and the substrates are bonded by applying a load from above. shall be.

[Function] In the magneto-optical disk bonding method of the present invention, a pin having a recess on the outer surface that serves to accommodate surplus adhesive is used as a positioning (centering) pin.
Excess adhesive that has protruded from the adhesive surface of the magneto-optical disk substrate is collected in this recess. Therefore, excess adhesive is prevented from seeping out to the surface of the magneto-optical disk.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of a bin for positioning a disk substrate adopted in the present invention, and FIG.
1 is a schematic cross-sectional view illustrating a method of implementing the invention using the illustrated bottle; FIG.

As shown in the figure, the disk substrate positioning pin 10 employed in the present invention has a recess (
In this embodiment, a concave groove 11 is provided.

The method of the present invention can be carried out in the same manner as the conventional bonding method, except that a bottle having such a recess for accommodating excess adhesive is used on the outer peripheral surface as a pin for positioning the disk substrate. I can do it.

Therefore, in the present invention, by using the positioning pin 10 having a concave portion (concave groove 11) on the outer circumferential surface as shown in FIG. When inserting this pin 10 into the 5.5° pin insertion hole of the disk substrate and crimping between the glass plate 2 and the glass disk 6 with the adhesive 8, excess adhesive is collected in the groove 11. It will be done. This prevents excess adhesive from seeping out onto the surface of the optical disc and adhering to the surface.

In the present invention, there is no particular restriction on the shape or size of the recess formed on the outer peripheral surface of the bottle 10, and the recess is not limited to that shown in FIG. If the groove 11 is formed in the axial direction of the plate 10, the groove 11 also acts as an air vent hole that communicates with the outside during bonding, allowing air to escape (arrow A in Fig. 2).
Enables better bonding with higher adhesion□
Ru.

The larger the opening area and the deeper the recesses formed in the positioning pin, and the greater the number of recesses, the larger the amount of excess adhesive that can be accommodated, which will more reliably prevent adhesive from seeping out. However, on the other hand, the safety of disk positioning may deteriorate. Therefore, the shape, size, number, etc. of the recesses are appropriately determined in consideration of the capacity for storing excess adhesive, the stability of positioning, and the ease of cleaning the adhesive adhered to the recesses.

In general, it is preferable to have 3 to 5 grooves extending in the pin axis direction and having a depth of about 3 mm formed at equal intervals.

In this way, a magneto-optical disk is manufactured in which two substrates are entirely bonded together with an adhesive.

The magneto-optical recording layer may be formed on both of the two substrates to make a double-sided magneto-optical disk, but the magneto-optical recording layer may be formed on only one substrate and not on the other substrate. It may also be used as a magneto-optical disk.

[Effects of the Invention] As detailed above, according to the magneto-optical disk bonding method of the present invention, excess adhesive protrudes from the adhesive surface between the magneto-optical disk substrates to be bonded and is deposited on the surface side of the magneto-optical disk. This makes it possible to effectively prevent adhesion and efficiently manufacture extremely high-quality magneto-optical disks.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a pin for positioning a disk substrate that can be adopted in the present invention, FIG. 2 is a schematic cross-sectional view showing an embodiment of the present invention, and FIG. 3 is a conventional method. FIG. 5.5°...Magneto-optical disk, 8...Adhesive, 10...Positioning pin, 11...Concave groove. Agent: Patent Attorney Tsuyoshi Shigeno Figure 1. Figure 3

Claims (1)

[Claims] (1) A method in which a magneto-optical disk substrate having a magneto-optical recording layer and an opening formed in the center is bonded to another substrate having the same shape as the magneto-optical disk substrate using an adhesive. hand,
Using a mounting board equipped with a pin having an outer diameter that matches the opening in the center of the board and having a recess formed on the outer surface, two boards are placed on the mounting board with an adhesive between them. A method for bonding magneto-optical disks, the method comprising: placing a substrate on a mounting board by inserting an opening through a pin, and applying a load from above to bond the substrate.