JPH0714297A - Disk driving apparatus - Google Patents

Abstract

PURPOSE:To obtain a disk driving apparatus which can maintain the height of a disk mounting face in high accuracy and can prevent the deflective motion of the disk mounting face and which can prevent a turntable from falling even it is made small and thin. CONSTITUTION:In a disk driving apparatus, a disk is placed on a turntable 12, and the turntable 12 is turned by a driving source 11. The turntable 12 is outsert-molded and integrated with a shaft 11a for the driving source 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device for rotating an optical disk such as a compact disk.

[0002]

2. Description of the Related Art Conventionally, a disk drive device of this type has a structure as shown in FIG. In FIG.
A bracket 2 for mounting a chassis is fixed to the motor 1. On the shaft 1a of this motor 1,
The turntable 3 as shown in FIG. 11 is press-fitted and attached in the arrow X direction.

After the turntable 3 is press-fitted into the shaft 1a,
A plurality of steel balls 5 and an O-ring 4 are inserted and the center cap 6 is press-fitted into the turntable 3. In this way, the spindle portion of the conventional disk drive device is completed.

[0004]

However, in such a conventional disk drive device, the turntable 3 itself swings with higher accuracy in consideration of a change or deformation when the turntable 3 is press-fitted into the shaft 1a. Need to be suppressed. Further, at the time of assembly, it is necessary to strictly control the height H of the disk mounting surface 3a shown in FIG. 10 and the pressure input.
This is because the height H is set to a predetermined dimension and that the disc mounting surface 3a is less likely to swing, which is an important factor when recording information on the disc or reproducing the information from the disc. Because.

Therefore, when the turntable 3 is press-fitted into the shaft 1a of the motor 1, the height H and the swing of the turntable 3 are strictly controlled, and the pressure input at that time is also practically usable. It is necessary to manage the value to obtain it. Therefore, conventionally, there has been a problem that it is often necessary to use an adhesive together so as to secure a press-fitting force that can endure this actual use and prevent the turntable 3 from falling off.

Further, due to the recent demands for downsizing and thinning of the disk drive device, both the turntable 3 and the motor 1 are thinned, so that the length of the shaft 1a is short and the press-fitting span of the turntable 3 is short. However, there is a problem that it is very difficult to secure the accuracy of the height H and the swing of the turntable described above, and to suppress the pressure input to a required value.

The present invention has been made to solve the above problems, and the height of the disk mounting surface and the deflection of the disk mounting surface can be maintained with high accuracy even if the size or thickness is reduced. An object of the present invention is to provide a disk drive device capable of preventing the turntable from falling off.

[0008]

According to the present invention, there is provided a disk drive device in which a disk is placed on a turntable and the turntable is rotated by a drive source. This is achieved by an outsert-molded and integrated disk drive on the shaft.

Further, in the present invention, preferably, the information recorded on the disk is reproduced or the information is recorded on the disk by rotating the disk. Further, in the present invention, preferably, the turntable includes an overhang portion protruding from a tip end portion of a shaft of the drive source.

Further, in the present invention, preferably, a press-fitting member is provided between the turntable and the shaft of the drive source, and the press-fitting member is press-fitted into the shaft.

[0011]

According to the above structure, since the turntable is outsert-molded and integrated with the shaft of the drive source, the turntable can be accurately set on the shaft.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the examples described below are suitable specific examples of the present invention, and therefore, various technically preferable limitations are given, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

FIG. 1 is a perspective view showing a preferred embodiment of the disk drive device of the present invention. In FIG. 1, the disk drive device includes a motor 11, a turntable 12 and an optical pickup 14.

On the turntable 12, an optical disc D as shown by a broken line can be set in a removable manner. The optical disc D is an optical disc such as a compact disc (CD).

A turntable 12 is fixed to the shaft 11a of the motor 11. Optical pickup 1
Reference numeral 4 denotes, for example, a biaxial actuator, which includes an objective lens 16. The objective lens 16 can move in the tracking direction TR and the focus direction FC.

As a result, the optical pickup 14 can reproduce the information recorded on the disc D, for example.

Please refer to FIG. 2 and FIG. 2 and 3, the motor 11 and the spindle portion SP are shown.
The motor 11 has a shaft 11a as an output shaft. The spindle portion SP is fixed to the shaft 11a.

The spindle portion SP is a turntable 12
And an O-ring 20, a plurality of steel balls 22, and a center cap 24.

Turntable 1 of this spindle section SP
2 is fixed to the shaft 11a of the motor 11 as follows. That is, the shaft 11a of the motor 11 is inserted into a mold (not shown), the turntable 12 is outsert-molded with respect to the shaft 11a, and the shaft 11a and the turntable 3 are integrally molded.

Therefore, as shown in the conventional example, the turntable is not attached to the shaft by press fitting, but the turntable is changed or deformed by press fitting.
Variations in the height H of the disk mounting surface 12a are reduced, and high precision is achieved.

That is, the dimensional accuracy of the height H of the disk mounting surface 12a of the turntable 12 and the disk mounting surface 12
The accuracy of the shake of a can be determined by the accuracy of the mold for outsert molding. Therefore, it is not necessary to consider the deformation and variation of the turntable 3 due to press fitting as in the conventional case, and the highly accurate turntable 12 can be provided.

After the turntable 12 is integrally and securely fixed to the shaft 11a as described above, the center cap 24, the steel ball 22 and the O-ring 20 are integrally turned as shown in FIG. 12 convex parts 12
Fix at c.

The motor 11 is provided with a screw hole 28 for mounting the motor on the chassis. A hole 12d is formed in the turntable 12. The motor 11 is fixed to the chassis by inserting a tool into the hole 12d and tightening a screw in the screw hole 28.

Further, an overhang portion 26 also called a convex portion is formed at the center of the turntable 12. This overhang portion 26, as shown in an enlarged scale in FIG.
The shaft 11a is formed so as to protrude along the diametrically inner side of the tip portion 11b. By doing so, when the disc is placed on the placing surface 12a on the turntable 12, the turntable 12 is set to the shaft 11
It is possible to positively prevent the turntable 12 from falling off the shaft 11a by applying a weight to a.

In the embodiment described above with reference to FIGS. 1 to 4,
It is possible to improve the accuracy of the height H of the disk mounting surface 12a of the turntable 12 and reduce the swing of the disk mounting surface 12a. Then, the turntable 12 can be prevented from falling off the shaft 11a. In addition, the press-fitting process and the inspection process after the press-fitting, which are conventionally required, are not necessary, the assemblability is greatly improved, and the cost can be reduced.

Next, please refer to FIG. 5 to FIG. 5 to 8 show another embodiment of the disk drive device of the present invention.

In this embodiment, the press-fitting metal 50 as a press-fitting member is press-fitted to the shaft 11a of the motor 11.

Since the press-fitting height of the press-fitting metal 50 does not need to be controlled so strictly, only the press-fitting need be controlled, so that the assemblability is improved. This press-fit metal 50
By press-fitting into the shaft 11a, the removal force of the turntable 112 can be improved. In this manner, the turntable 112 is outsert-molded with the press-fitted metal 50 press-fitted into the shaft 11a to be integrally formed with the shaft 11a and the press-fitted metal 50.

After that, as shown in FIG. 5, the center cap 24, the steel ball 22, and the O-ring 20 are press-fitted into the convex portion 112c of the turntable 112. In addition,
As shown in the enlarged view of FIG. 8, the overhang portion 126 of the turntable 112 covers the tip portion 11b of the shaft 11a, as in the above-described embodiment.

Next, referring to FIG. FIG. 9 shows still another embodiment of the disk drive device of the present invention. The shaft 11a of the motor 11 has a turntable 2
22 is integrally molded and fixed by outsert molding. A magnetic material or a magnet M is fixed to the convex portion and the 222c of the turntable 222 via a member 200. This embodiment is an example of a magnet chuck type turntable for fixing a disk by a so-called magnet.

[0031]

As described above, according to the inventions of claims 1 and 2, since the turntable is integrally formed on the shaft of the drive source by outsert molding,
It is possible to maintain the dimensional accuracy of the height of the disk mounting surface and the deflection due to the rotation of the disk mounting surface with high accuracy. This can be maintained even when the size or the thickness is reduced. Further, the press-fitting process which has been necessary in the past becomes unnecessary, and further, the management at the time of assembling after the press-fitting process becomes unnecessary, and the cost can be reduced. According to the third aspect of the invention, since the overhang is provided, it is possible to prevent the turntable from falling off more positively.
Further, according to the invention of claim 4, since the press-fitting member is press-fitted into the shaft, the turntable can be more reliably fixed to the shaft.

[Brief description of drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a disk drive device of the present invention.

FIG. 2 is a diagram showing a motor and a spindle section of the disk drive device of FIG.

FIG. 3 is an exploded view of FIG.

FIG. 4 is an enlarged view showing a connecting portion between a shaft and a turntable in FIG.

FIG. 5 is a view showing another embodiment of the disk drive device of the present invention, showing a motor and a spindle portion.

FIG. 6 is a diagram showing a press-fit metal and a motor in the embodiment shown in FIG.

FIG. 7 is a view showing a state in which the turntable is outsert-molded after the press-fitted metal is press-fitted onto the shaft of the motor.

FIG. 8 is an enlarged view showing a coupling portion of the shaft, the turntable and the press-fitted metal of FIG.

FIG. 9 is a diagram showing still another embodiment of the disk drive device of the present invention, showing a motor and a spindle portion.

FIG. 10 is a diagram showing a motor and a spindle of a conventional disk drive device.

FIG. 11 is an exploded view of FIG.

[Explanation of symbols]

 11 Motor (Drive Source) 11a Shaft 12 Turntable 12a Disk Placement Surface 14 Optical Pickup 20 O-ring 22 Steel Ball 24 Center Cap 26 Overhang Part 50 Press-Fit Metal (Press-Fit Member) SP Spindle Part

Claims (4)

[Claims] 1. A disk drive device in which a disk is placed on a turntable and the turntable is rotated by a drive source, wherein the turntable is integrated by outsert molding to a shaft of the drive source. And a disk drive device. 2. The disk drive device according to claim 1, wherein the information recorded on the disk is reproduced or the information is recorded on the disk by rotating the disk. 3. The turntable includes an overhang portion protruding from a tip end portion of a shaft of the drive source.
The disk drive device according to claim 1. 4. The disk drive device according to claim 1, further comprising a press-fitting member provided between the turntable and the shaft of the drive source, the press-fitting member being press-fitted into the shaft.