JPH0366080A - Mount part of optical disk - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical disc on which optical information can be recorded, reproduced, erased, and rewritten at high density by means of light, heat, etc.
In particular, it relates to the related structure between the optical disk substrate and the hub section.

[Conventional technology]

Conventionally, in a hub-equipped optical disk, as shown in FIG. 4, a center hole 21a is formed by punching out the center of an optical disk substrate 21, and a hub section 22 is attached using the center hole 21a to create a hub-equipped optical disk. It constitutes an optical disk.

In this case, the size of the hub portion 22 that engages with the center hole 21a of the optical disk substrate 21 is slightly smaller in diameter than the size of the center hole 21a. This clamping method for an optical disk with a hub is based on the spindle 1 of the disk drive motor 11.
The back surface of the disk substrate 21 is held on the turntable 13 fixed to the turntable 2, and the center position of the hub-equipped optical disk is determined by the engagement of the spindle 12 with the hole in the magnetic material 23 of the hub portion 22. , is clamped by the magnetic attraction force between the magnetic body 23 of the hub portion 22 and the magnet 14 fixed within the turntable 13.

[Problem to be solved by the invention]

When punching a center hole in the center of the disk substrate in the optical disk with a hub as described above, burrs may be generated around the center hole, and in some cases, the center hole may not be a perfect circle and the disk substrate may be damaged. This results in eccentricity with respect to the recording surface.

For this reason, when attaching the thin hub portion to the disk substrate, inclination and eccentricity occur.

In addition, the positioning of the disk board and the hub part is very rough, and it is necessary to perform alignment again using a microscope, etc., and since the hub part is thin, the hub part deforms during rotation. do.

The present invention eliminates the above-mentioned conventional drawbacks, eliminates tilting or eccentricity between the recording surface of the disk substrate and the hub section attached to the disk substrate, and facilitates positioning of the disk substrate and the hub section. The purpose of the present invention is to provide a structure for mounting an optical disc that can increase the rigidity of the hub part.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides an optical disc mounting section in which a hub part is fitted into the center part of the disc substrate, and a spindle of a disc drive motor is positioned in the hub part. This is characterized by forming a concave portion or a convex portion that can fit into a boss portion or hole-like portion formed on the thick hub portion.

Further, the present invention provides an optical disk mounting section in which a hub part is fitted into the center of a disk substrate and a spindle of a disk drive motor is positioned in the hub part, and the thick hub is provided with a magnetic material. The part has a boss part or a hole-like part formed on one surface thereof to fit into a concave part or a convex part formed in the center of the disk substrate, and a hole on the other surface to fit with the spindle of the disk drive motor. It is characterized by forming a shaped part or a concave part.

[Effect]

With the configuration of the present invention, the concave or convex portion formed at the center of the disk substrate and the boss or hole formed in the thick hub portion fit together, enabling accurate positioning, and when rotating. No deformation of the hub portion occurs.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, as an embodiment of the disk mounting section, a boss section consisting of a convex portion is formed at the center position of the disk substrate,
A configuration is shown in which a hole-shaped portion that fits into the boss portion is formed in the hub portion.

At the center of the disk substrate 1, a concave portion 2 is formed on the first surface 1a on the side having the information recording section by removing the sprue necessary for molding, and a convex portion 3 is formed on the second surface lb on the opposite side.
is provided. A groove 4 is shown around the convex portion 3 provided at the center of the disk substrate 1 to speed up the cooling of the resin near the gate during molding and to seal the gate.

The hub portion 5 has a thick cylindrical shape with a constant thickness, and has a penetrating hole portion 7 formed in the center thereof that can fit with the convex portion 3, and a magnetic material on the end surface of the hub portion 5. 6 is fixed, and the magnetic body 6 faces a drive-side magnet, which will be described later.

In this embodiment, the hub portion 5 can be attached to the disk substrate l by fitting the convex portion 3 of the disk substrate 1 and the hole portion 7 of the hub portion 5 by bonding, ultrasonic bonding, etc. Therefore, the thick hub portion 5 is accurately fixed to the center position of the disk substrate 1 without being deformed.

Another embodiment of the invention for mounting the disk is shown in FIG.

The difference from the above embodiment is that a concave portion 8 is formed at the center of the disk substrate, and a convex boss portion 9 that fits into the concave portion 8 is formed on one end surface of the thick hub portion 5. A concave groove lO is formed on the other end surface of the thick hub portion 5 that fits into the side spindle.

In this embodiment, in order to attach the thick hub portion 5 to the center of the disk substrate 1, the concave portion 8 of the disk substrate 1 and the convex boss portion 9 of the hub portion 5 are fitted, and the same connection as described above is performed. By this means, the hub portion 5 can be correctly positioned and mounted at the center of the disk substrate 1.

FIG. 3 shows a state in which the disk substrate 1, on which the hub portion 5 having the configuration shown in FIG. 2 is mounted, is clamped by means for driving the disk substrate 1. As shown in FIG.

A turntable 13 is fixed to the spindle 12 of the disk motor 11, and the second surface of the disk substrate 1 is held on the end surface of the turntable 13.

A magnet 14 is fixed in the turntable 13, and the magnet 14 is placed in a position where magnetic attraction force acts on the magnetic body 6 attached to the hub portion 5, and the tip of the spindle 12 is placed in the position where the magnetic body 6 attached to the hub portion 5 acts. By being engaged and fixed with the concave groove portion 10, the center position of the disk substrate 1 with the hub portion 5 mounted thereon is correctly positioned on the spindle 12.

A penetrating hole 7 or a concave groove 10 formed in the hub portion 5 fits with the tip of the spindle 12 and is formed to have the same diameter as the spindle 12 .

The relationship between the disk substrate 1 on which the hub portion 5 is attached and the drive side of the disk substrate 1 is the same for the disk substrate l shown in the embodiment shown in FIG. By securing and fixing the tip of the spindle 12 to the shaped portion 7, the center position of the disk substrate 1 with the hub portion 5 mounted thereon can be correctly positioned on the spindle 12.

〔effect〕

The structure of the present invention eliminates the need to form a through hole in the center of the disk substrate as in the past, and instead arranges a convex portion and a concave portion in the center of the disk substrate for positioning, and makes the hub portion thick. Since the hub portion is fixed and fixed to the convex portion and the concave portion, it is possible to accurately position the two, and there is an effect of eliminating deformation in the hub portion.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing a first embodiment of the present invention, Fig. 2 is a schematic sectional view showing a second embodiment of the invention, and Fig. 3 is a schematic sectional view showing a second embodiment of the invention and a disk. A schematic cross-sectional view showing the relationship with the drive side. FIG. 4 is a schematic cross-sectional view showing the conventional configuration. l... Disk substrate, 3... Convex portion formed at the center of the disk substrate, 8... Concave portion formed at the center of the disk substrate, 5... Thick hub portion, 7... Thickness Through hole formed in the thick hub part, 9... Convex part formed in the thick hub part (to engage with the concave part of the disk substrate), 1O... Concave part formed in the thick hub part (spindle ). Figure 1

Claims (2)

[Claims] (1) In the optical disc mounting part where a hub part is fitted into the center part of the disc board and the spindle of the disc drive motor is positioned in the hub part, a thick hub part is fitted in the center part of the disc board. 1. An optical disc mounting part, characterized in that a concave part or a convex part is formed that can fit into a formed boss part or hole-like part. (2) In an optical disc mounting part where a hub part is fitted into the center of a disc substrate and a spindle of a disc drive motor is positioned in the hub part, the thick hub part provided with a magnetic material is A boss or a hole is formed on one surface to fit into the concave or convex portion formed in the center of the disk substrate, and a hole or concave to fit into the spindle of the disk drive motor is formed on the other surface. 1. A mounting part for an optical disc, characterized in that the mounting part forms a part.