JPH0457261A - Hub for optical disk - Google Patents

Abstract

PURPOSE:To prevent an adhesive agent from projecting from the face of a disk substrate and to obtain the enough adhesive strength of a hub by providing the escape part of the adhesive agent to be formed by a groove or a step on the cylindrical part side of the hub. CONSTITUTION:One ring shape groove 4a is provided on the cylindrical part side of a hub 1a. When the hub is adhered by using this 1a, protrusion 5 of the adhesive agent can be prevented since the adhesive agent 3 resides in the ring groove 4a. On the other hand, a projecting part formed by the adhesive agent 3 is engaged with the adhesive agent escape part 4a of the hub and further, an adhesive agent is increased. Therefore, the adhesive strength is increased. Moreover, since the adhesive agent escape part 4a is provided, a margin is increased for the amount of applying the adhesive agent when adhering the hub.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc hub for mounting a magneto-optical recording medium or the like on which information is recorded, reproduced, and erased by means of light onto a drive device using a magnetic clamp.

[Prior art] Disk hub 1 for write-once optical disks and magneto-optical disks
c is an insert-type hub that has a clamping part for the disk drive device with an alignment hole in the center, a cylindrical part on the side, and an oil part used for adhesion to the disc, as shown in Fig. 3. is used.

To adhere the hub, read the group on the disk board using image processing or a direct pickup, align the center of the group with the centering hole of the hub, insert the cylindrical part into the circular hole of the disk, and insert the cylindrical part into the circular hole of the disk, Generally, sonic welding or bonding using ultraviolet curable resin is used.

[Problems to be Solved by the Invention] However, when the hub is bonded with ultraviolet curable resin, sufficient bonding strength cannot be obtained by bonding only the oil portion as shown in Figure 6, so the side surface of the cylindrical portion of the hub is However, with conventional hubs, when the side surface of the cylindrical part of the hub is glued, the adhesive resin protrudes from the substrate as shown in Figure 7, and the protruding adhesive 5 is clamped to the disk drive device. This had the problem of interfering with the

An object of the present invention is to eliminate the protrusion of resin from the side surface of the cylindrical portion of the hub when bonding an insert-type hub, and to increase the adhesive strength of the hub.

[Means for Solving the Problems] To achieve the above object, the optical disc hub of the present invention has a circular hole in the center and can record and reproduce information by light.
Used in a disc-shaped optical disc having a first surface on which an erasable recording film is formed and a second surface onto which light enters, the disc is attached from the first surface to the circular hole and fixed with an adhesive. The present invention is an insert-type optical disc hub, characterized in that an adhesive release part is provided on the side surface of the cylindrical part of the optical disc hub.

The form of the adhesive release portion is at least one ring-shaped groove or step.

[Function] When using the optical disk hub of the present invention, the adhesive 3 applied to the inner circumference of the disk substrate when adhering the knob is spread by pressing the hub, and is bonded to the side surface of the cylindrical portion of the hub. Although the adhesive enters, the adhesive does not protrude above the substrate surface because it enters the relief part provided on the hub, and the convex part formed by the adhesive and the adhesive relief part of the hub engage with each other. Furthermore, since the adhesive area increases, the adhesive strength becomes stronger. Furthermore, by providing the adhesive release portion, the margin for the amount of adhesive applied when bonding the hub is increased.

[Embodiment 1] FIG. 1 is a perspective view of a hub 1a of the present invention, which is provided with one ring-shaped groove 4a on the side surface of the cylindrical portion of the hub. When the hub was bonded using the hub shown in FIG. 1, as shown in FIG. 4, the adhesive remained in the ring-shaped groove 4a, thereby preventing the adhesive from protruding 5.

Moreover, the adhesive strength was 90 kg, and sufficient adhesive strength was obtained.

[Example 2] When the hub 1b shown in FIG. 2 was used to bond the hub, it was possible to prevent the adhesive from spilling out 5 due to the step 4b on the side surface of the cylindrical portion of the hub. Moreover, the adhesive strength was 95 kg, and sufficient adhesive strength was obtained.

[Comparative Example] FIG. 3 is a perspective view of a conventional hub 1c. Conventional hub 1
FIGS. 6 and 7 show vertical cross-sectional views of the disc 2c attached to the single-plate disk substrate 2 with an adhesive.

Adhesion using only the oil part of the hub lc as shown in FIG. 6 had an insufficient adhesive strength of 20 kg. Therefore, when we glued the side surface of the cylindrical part of the hub as shown in Figure 7, the adhesive strength was 70.
Although a sufficient bonding strength of 1.5 kg was obtained, when the conventional hub 1c was used, it was difficult to control the overflow 5 of the adhesive from the side surface of the cylindrical portion of the hub as shown in FIG.

[Effects of the Invention] By providing an adhesive relief part in the form of a groove or a step on the side surface of the cylindrical part of the hub, the adhesive does not protrude from the disk substrate surface, and the margin for the amount of adhesive applied is wide (and Sufficient hub adhesive strength can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of a hub according to the present invention, Figure 3 is a perspective view of a hub according to the prior art, and Figures 4 and 5 are cross-sections of the hub according to the present invention bonded to a disk substrate. 6 and 7 are cross-sectional views of bonding when using a hub of the prior art. la, lb, lc in the diagram: /\B2
: Disk substrate 3 : Adhesives 4a, 4b : Adhesive release part 5 :
Adhesive Extrusion Department Agent Patent Attorney Takahashi Katsuki La Hub Figure 1 b Huff Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A disk comprising a first surface with a circular hole in the center and a recording film on which information can be recorded, reproduced, and erased by light, and a second surface onto which light enters. An insert-type optical disc hub that is used in a circular hole from the first surface and fixed with an adhesive, the hub for the optical disc having an adhesive release part on the side surface of the cylindrical part of the optical disc hub. An optical disc hub characterized by: 2. The optical disc hub according to claim 1, wherein the adhesive release portion is at least one ring-shaped groove. 3. The optical disc hub according to claim 1, wherein the adhesive release portion is a step.