JPS61139956A - Manufacture of information carrier disk - Google Patents

Abstract

PURPOSE:To make an external form finish of a substrate unnecessary, and to reduce cost by constituting a titled disk so that two substrates which have placed a viscous adhesive agent between are rotated, and a adhesive agent which has been protruded to an outside peripheral edge by a centrifugal fore is removed by a suction nozzle. CONSTITUTION:A disk substrate 2 on which a recording layer 1 has been formed is inserted into a center boss 7 of a rotary tool 6, the substrate is vacuum- adsorbed through a groove 3, a viscous ultraviolet polymerization type adhesive agent 8 is applied to the substrate, and thereafter, a protective substrate 9 is placed on it, and when the substrate is rotated, the adhesive agent is spread out to the outside peripheral end by a centrifugal force and packed between the substrates. Subsequently, the rotation is decelerated, an opening part 13 of a suction nozzle 12 is made to contact to the outside peripheral edge of the substrate, and a surplus adhesive agent 15 is absorbed and removed, and hardened by irradiating an ultraviolet ray from the direction as indicated with an arrow 16. Accordingly, the surplus adhesive agent is removed before it is hardened, an external form finish of the substrate becomes unnecessary, and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides at least one disk-shaped substrate having an information medium layer.
This invention relates to a method of manufacturing an information carrier disk (hereinafter simply referred to as a disk), which is made by bonding two disk-shaped substrates together.

Conventional technology Conventionally, an information medium layer is provided on a transparent substrate, such as an unrecorded recording medium layer on one side of a disc-shaped transparent substrate, or a reflective layer formed on uneven pits on which predetermined information signals are recorded. Using a disk substrate with the information medium layer facing each other, or simply bonding a protective substrate so as to face the information medium layer, information can be recorded and reproduced using, for example, a laser beam. Optical discs that perform this function or playback-only video discs have been put into practical use. The method of bonding these two disc-shaped substrates together is to sandwich a viscous adhesive between the two substrates and apply the adhesive twice while rotating the two substrates.
Although no method has been proposed in which the entire surface between two substrates is uniformly filled and bonded, the bonding method that the inventors first considered had a configuration as shown in Figure 6. .

That is, a disk-shaped disk substrate 2 having a recording medium layer 1 formed on one side is passed through a center bossk to a rotating tool 6 having a groove 3 for vacuum suction and a ventilation hole 4 and having a shaft 6 on the center of rotation. Fix it. Next, apply a viscous adhesive 8 concentrically with the center boss 7, stack the protective substrate 9, and leave it until the adhesive 8 comes into contact with the entire circumference of the center boss 7 due to the weight of the protective substrate 9. After filling the entire surface of the substrate with adhesive 8 by rotating the substrate and shaking off the excess adhesive, the adhesive is cured and pasted while rotating at a speed slower than the rotation speed at which the two substrates are rotated. I'm busy trying to match 9.

Problems to be Solved by the Invention However, when the two substrates are rotated and the excess adhesive is removed, excess adhesive 11 accumulates on the outer peripheral edge 10 of the disk. When cured, the adhesive 11 will protrude irregularly from the outer peripheral edge 1o of the disk, so by curing the adhesive while rotating at a rotation speed sufficiently lower than the rotation speed at which the adhesive is filled and shaken off, The adhesive 11 is evened out to obtain a smooth hardened state, but the adhesive 11 is evened out on the outer peripheral edge 1 of the disk.
Since the disk is cured in a state protruding from the outside, the outer shape of the disk becomes larger than that of the two substrates. For this reason, for example, if the disc is placed in a case such as a disc cartridge, or if the adhesive protrudes outward, causing problems, it is necessary to finish the external shape of the disc after pasting the two boards together. Ta.

The present invention aims to provide a manufacturing method that does not require post-processing of the outer shape even when the outer shape and appearance of the disk are in question.

Means for Solving the Problems In order to solve the above-mentioned problems, the excess adhesive on the outer circumferential edge of the disk is removed by suction before the adhesive protruding onto the outer circumferential edge of the disk is cured.

In other words, after rotating the two substrates and uniformly filling the entire surface with the viscous adhesive between the substrates, the two substrates are rotated at a slower speed than the rotation that fills the entire surface with the adhesive, and then the outer periphery is filled with the adhesive. By bringing a suction nozzle into contact with the adhesive that has accumulated on the edge and suctioning it, bonding can be performed without adhesive protruding from the outer peripheral edge.

As a result, the outer diameter of the disk is almost the same as the outer diameter of the two substrates, and finishing work such as contouring is not required, allowing low-cost bonding.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, recording medium layer 1. Disk substrate 2. Groove 32 for vacuum suction 4. Shaft 69 rotating tool 6. center boss 7
, adhesive8. The protection board 9 has the same structure as the conventional example shown in FIG. 6 and is indicated by the same number. FIG. 2 is a plan view showing the suction state in FIG. 1. 12 in Figures 1 and 2
The suction nozzle is composed of a pipe with the end that contacts the outer peripheral edge of the disk constricted, and as shown in Fig. 3, the opening 13 at the end of the suction nozzle 12 has an elongated oval shape. Its longitudinal dimension is longer than the thickness of the two substrates, and the tip of the suction nozzle 12 is flat. Furthermore, since the suction nozzle 12 is made of a thin pipe, the thickness of the suction nozzle 12 is even thinner than the width of the opening 13. This is important to prevent the adhesive from wrapping around the disk surface during blotting.

That is, when the disk rotates in the direction of the arrow 14 to perform suction as shown in FIG. After scraping off the adhesive 15, blotting is performed through the opening 13, which enables more reliable blotting. The tip of the suction nozzle 12 needs to be as thin as possible because the scraped excess adhesive 16 will wrap around the disk surface. Note that the suction nozzle 12 can be easily brought into contact with the outer circumferential edge of the disk by, for example, pressing it with a spring.

Next, a method of bonding two disc-shaped substrates together by removing excess adhesive using the suction nozzle 12 will be described with reference to FIGS. 1 to 6. First, as shown in FIG. 4, insert the center boss into the shaft 5 of the rotating tool 6, place the disk substrate 2 with the recording medium layer 1 facing up, and pass the disk substrate 2 through the groove 3 and ventilation hole 4 of the rotating tool 6. Vacuum adsorption. The rotary tool 6 is rotated around the shaft 6 while this vacuum suction is performed, but this can be easily done by using a motor and a rotary joint (not shown) as is commonly done. It is possible. Next, an ultraviolet polymerized adhesive 8 is applied to the disk substrate 2, and the protective substrate 9 is brought into contact with the entire circumference of the adhesive 8. If the protective substrate 9 is left alone in this state, the adhesive 8 will spread in the directions of the inner and outer peripheries of the disc-shaped substrate, respectively, due to the weight of the protective substrate 9, as shown in FIG. At this time, the protective board 9
It is also possible to apply appropriate pressure.

As shown in FIG. 5, after the adhesive 8 has spread and the inner circumferential side of the adhesive 8 is in contact with the entire circumference of the center boss 7, the two substrates are rotated around the shaft 5 of the rotating tool 6. As a result, the adhesive 8 spreads toward the outer edge of the disk due to centrifugal force, and the adhesive overflowing from the outer edge is scattered by centrifugal force and wraps around the disk surface, as shown in the conventional example in FIG. There isn't. At this time, the number of rotations of the disk 4 and the rotation time are important in order to obtain an adhesive layer with a uniform thickness or to fill the entire surface of the disk, and this condition is influenced by the viscosity of the adhesive, but specifically When using an adhesive with a viscosity of 1ooOCP to 2000CP (25°C), the rotation speed is 300 to 1000 rPm.
A predetermined thickness of the adhesive layer could be obtained with a rotation time of 30 to 90 seconds, and the adhesive could be uniformly filled over the entire surface between the two substrates.

Next, as shown in FIGS. 1 and 2, the suction nozzle 12 is brought into contact with the disk while rotating at a rotation speed sufficiently lower than the rotation speed at which the adhesive is filled, causing centrifugal force to overflow to the outer peripheral edge of the disk. The excess adhesive 11°6 that did not scatter at t*-ffi
L & rear arrow 1'° 0 direction 7' ultraviolet rays
1, it is possible to perform bonding in a short time.

Effects of the Invention The present invention, when bonding two disc-shaped substrates together on their entire surfaces with a viscous adhesive, sucks the excess adhesive overflowing to the outer edge while rotating the two disc-shaped substrates before curing the excess adhesive. By sucking up the excess adhesive while keeping the nozzle in contact with the outer edge, it is possible to bond the disk without excess adhesive protruding from the outer edge. This still allows for low-cost bonding that does not require finishing work such as contour processing.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an apparatus in which the method of manufacturing an information carrier disk of the present invention is carried out, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a front view of the tip of the suction nozzle of the same apparatus, and FIG. 6 is a sectional view of an apparatus showing the method for manufacturing an information carrier disk of the present invention, and FIG. 6 is a sectional view of an apparatus implementing the conventional method for manufacturing an information carrier disk. 2... Disk board, 6... Rotating tool, 8...
...Adhesive, 9...Protection board, 12...
...Suction nozzle. Funeral Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) A viscous adhesive is sandwiched between two disc-shaped substrates, and the adhesive is filled between the two substrates while rotating the two substrates around their center holes. , The two substrates are rotated at a rotation speed lower than the rotation speed of the two substrates during filling, and at this time, the suction nozzle is brought into contact with the outer peripheral edges of the two substrates to remove excess adhesive. Method for manufacturing an information carrier disk. (2) The method of manufacturing an information carrier disk according to claim 1, wherein the suction nozzle has a substantially flat tip and an opening formed of a thin pipe having an elongated rectangular or elliptical shape.