JPS6180534A - Sticking method of optical disk substrate - Google Patents

Abstract

PURPOSE:To simplify a device and to facilitate its operation by putting a pressurized fluid in a hollow pat provided to one flat plate by using a rubber sheet, and attaining adhesion under pressure. CONSTITUTION:A recessed part larger than an optical disk substrate is provided to an upper plate 1, and the rubber sheet 3 is stuck thereupon and fixed with a rubber sheet presser 4. This rubber sheet presser 4 is thicker than the size of two disks and an adhesive layer. A lower plate 2 has its surface smoothed and is provided with a centering hole 5 at the center part. A disk 8 coated with an adhesive is stacked thereupon and the upper plate 1 or lower plate 2 is moved; a space is formed between the disk substrate 8 and rubber sheet 3 and the disk substrate 8 and rubber sheet 3 enter a noncontacting state. When fluid is flowed in through the inflow/outflow passage of the upper plate 1 to apply pressure, the center part expands convexly and the disk comes into contact from the center part to apply pressure concentrically toward the outer peripheral part. Consequently, burrs of the adhesive to the center hole side of the disk are reduced and deviation in center is reduced when the disk is loaded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for bonding two substrates in an optical disc.

[Technical background of the invention and its problems]

Conventionally, when pasting two optical discs together, two parallel flat plates were prepared, a jig was installed on the lower flat plate to align the center holes, and the two discs coated with adhesive were stacked together. The method used was to lower the flat plate (with a relief hole for the jig for aligning the center hole) above the ridge and overlap it (glue it together). If this method is adopted, the tensioning of the optical disc will require high levels of smoothness, degree and flatness of the two discs themselves, and high parallelism of the two flat waves. and,
Since the substrate itself is hard, the pressure is uneven (1)
) The torsional activity of the disk substrates becomes non-uniform. (2) The surface runout of the disk during rotation increases.

(3) Problems such as non-uniform distribution of adhesive, which causes uneven rotation, occur. Therefore, these 14 degrees are required, which increases the cost of manufacturing the device, and it is necessary to constantly check whether these precisions are maintained, making maintenance and inspection difficult and complicated. There is.

Furthermore, according to the prior art, when two disks are bonded together, the adhesive sticks out due to pressure bonding, resulting in cracks. The glue comes out both in the center hole and the outer rim, but especially in the center hole, you can be sure that it will be drilled accurately for the signal recording area, and if you attach the adhesive Verica S here, you can maintain that accuracy. Z < firu. Therefore, in the conventional method, finishing by burring is required, but this is done on two disk substrates at the same time, and as a result, the compensation value - h1 of the center hole of one of the disks decreases. becomes.

[Purpose of the invention]

The present invention has been made to improve the above-mentioned drawbacks of the prior art, and provides a simple method that allows the disk curtain plate 8 to be laminated with <S degree of accuracy.

[Summary of the invention]

In the present invention, when two disk substrates are pasted together, two disks are sandwiched between the two flat plates, and a hollow portion is formed using a rubber sheet around one of the flat plates. This is a method of laminating disc-finished plates, which is characterized by applying pressurized fluid to adhere the discs under pressure.

[Embodiments of the invention] The present invention will be described in detail below with reference to the drawings.

Figure 1 shows a schematic diagram of the apparatus used in the present invention. A recess larger than the original disk substrate is provided in the upper plate (1), a rubber sheet (3) is pasted there, and the rubber sheet (3) is identified by a rubber sheet stamper (4). The thickness of this rubber sheet presser 4) is made thicker than the adhesive layer of the two discs. Lower board (2
), make the surface smooth and provide a center hole alignment (5) in the center. Place the old disk board coated with adhesive here and move the top board (1) or trade-in (2) (Figure 2)
There is a space (
9) occurs, and the rubber sheet (3) is in a non-contact state with respect to the disk substrate 181. Upper plate (1) fluid entrance fi
When the fluid is injected through the l, the central part swells into a convex shape as shown in Figure 3, contacts from the central part of the disc, and concentrically pressurizes the disc toward the outer periphery. It will look like the hawk figure 4.

In this way, by applying pressure to push and spread from the center to the outer periphery, the adhesive on the large side of the center of the disc, which would have come out with the conventional method, becomes very small or disappears, causing the player to ) becomes smaller. Also, the fluid pressure decreases uniformly everywhere from the lower plate (ρ) to the lower plate (2
) is made smooth and the pressure applied to the surface of the disk substrate becomes uniform by breaking it, so that the upper and lower disk substrates are uniform and parallel with no unevenness of the adhesive -h1. Commercial fluids can be liquids or gases, and 7 in the figure is the valve for putting in and taking out the driftwood, and when the center part is free and sagging, the solution is to reduce the pressure. It may also be rubbed under a rubber sheet.

〔Effect of the invention〕

As described above, in the present invention, while the conventional method requires smoothness, flatness, and parallelism of flat plates, it is sufficient to smooth only one of the six upper and lower plates. Therefore M
Maintenance and inspection as well as operations are highly 11-accumulated.
h1 has the advantage of being less complicated.

[Brief explanation of drawings]

Figure 11 is a sectional view showing an example of the agricultural equipment used in the present invention, and Figures 2 to 4 are views showing its operating state. 1... Upper suction, 2... Trade-in, 3... Rubber sheet, 4
...Rubber sheet presser, 5...Sender alignment jig, 6
...R rest entrance/exit entrance, 7...Switching valve, 8...Disc board, 9...Space.

Claims (1)

[Claims] When pasting two disk substrates together, the two disk substrates to be glued are sandwiched between the two flat plates, a hollow part is created in one of the flat plates using a rubber sheet, and pressurized fluid is poured into this hollow part. A method for bonding optical disk substrates, characterized by pressure bonding.