JPH05120778A - Disk clamping device for disk reproducing device - Google Patents

Abstract

PURPOSE:To provide a disk clamping device for a disk reproducing device which facilitate an assembly work, is thin, has high accuracy and uses a smaller number of parts in the disk clamping device for disk reproducing device by adopting the constitution using no clamper and no adhering system. CONSTITUTION:A disk 17 placed on a turntable 26 is held by utilizing steel balls 36 and the elasticity of an O-ring 35 consisting of a rubber member, by which the number of the parts is reduced and the pawl parts of a piece holder 38 are held by the turntable 26. As a result, a spacer 34, the O-ring 35, the steel balls 36, and a case 37 are assembled into the turntable 26 without utilizing the adhering system and, therefore, the disk clamping device for the disk reproducing device which facilitates the assembly work, is thin, has the high accuracy and uses the smaller number of the parts is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc clamping device for accurately fixing a disc in a disc reproducing device of a system for optically recording and reproducing information by projecting a light spot on a disc-shaped recording medium. Is.

[0002]

2. Description of the Related Art In recent years, disk reproducing apparatuses have been diversified in their applications such as CD players, CD-ROMs, and multi-laser players year by year, and have become more and more high performance, high quality and high added value. In particular, in compact disc reproducing devices, the demands for portable and on-vehicle devices are on the rise, and further downsizing, thinning, and price reduction are required.

An example of the disc clamping mechanism of the above-mentioned conventional disc reproducing apparatus will be described below with reference to the drawings. FIG. 5 is an exploded perspective view of a disc clamp mechanism of a conventional disc reproducing apparatus. FIG. 6 is a sectional view of an assembly view of a disc clamp mechanism of a conventional disc reproducing apparatus. FIG. 7A shows an assembly view of a top view of a conventional disc reproducing apparatus. Figure 7
(B) is an exploded perspective view of a spindle portion of a conventional disc reproducing apparatus. FIG. 8A shows an assembled view of a rear view of the conventional disc reproducing apparatus. FIG. 8B is an exploded perspective view of an optical pickup feeding mechanism portion of a conventional disc reproducing apparatus.

5 to 8, 1 is a traverse base, 2 is a traverse motor, 3 is an optical pickup, 4 is a feed nut, 5 is a nut plate, 6 is a motor gear, 7 is a motor frame, 8 is an intermediate gear shaft, 9 is an intermediate gear, 10 is a retaining ring, 11 is a bearing, 12 is a drive shaft, 13 is a drive gear, 14 is a thrust spring, 15 is a spindle motor, 1
6 is a spindle motor mounting plate, 17 is a disk, 18 is a spindle motor mounting screw, 19 is a guide shaft, 20 is a turntable assembly, 21 is a motor block fixing screw,
22 is a disk protection sheet, 23 is a clamper, 24 is a clamper shaft, and 25 is a clamper receiver. In the turntable assembly 20, 26 is a turntable, 27 is a magnet, 28 is a centering spring, 29 is a centering ring,
Reference numeral 30 is a magnet fixing plate, 31 is an adhesive material that fixes the turntable 26 and the magnet 27, 32 is an adhesive material that fixes the magnet 27 and the magnet fixing plate 30, and 33
Is a clamper protection sheet.

The operation of the disc clamp device of the disc reproducing device configured as described above will be described below. A spindle motor mounting plate 16 is accurately mounted on the traverse base 1. A turntable assembly 20 is precisely attached to a spindle motor 15 attached to a spindle motor attachment plate 16 at a prescribed height, and a disc 17 is rotated at a prescribed rotation speed. A motor gear 6 is fixed to the traverse motor 2, and an intermediate gear 9 meshed with the motor gear 6 transmits the rotational force of the traverse motor 2 to the drive gear 13.
Further, the drive gear 13 is fixed to the drive shaft 12, and by fitting the drive shaft 12 and the feed nut 4 fixed to the optical pickup 3, the optical pickup 3 is moved in the tracking direction of the disc 17, and the disc 17 is moved. Read the signal of. The turntable assembly 20 includes a centering spring 28 that pushes up a centering ring 29 that performs centering of the disk 17 in the upward direction, and a magnet 27 that attracts the clamper 23 made of a magnetic material and fixed to the turntable 26 with an adhesive 31 by magnetic force. , A magnet fixing plate 3 fixed to the magnet 27 with an adhesive 32 for holding the centering ring 29
It is composed of 0 and can hold the disk 17 accurately.

[0006]

However, in the above-mentioned conventional structure, since the magnetic disk is used to hold the disk, the disk protection sheet 22, the clamper 23, the clamper shaft 24, and the clamper receiver 25 are required, and the structure of the parts is improved. There are problems that the number of elements increases, the number of constituent elements of the parts increases, the thickness of the product increases as a result, and the number of parts increases, resulting in high cost.

In view of the above-mentioned conventional problems, the present invention provides a disc clamping device for a disc reproducing device, which utilizes a small number of parts and has high precision, high quality, and easy assembling work without using magnetic force. It was done for the purpose.

[0008]

In order to solve the above problems, a disk clamp device of a disk reproducing apparatus according to the present invention comprises a turntable on which a disk is placed and a spacer which is accurately fitted to a fitting portion of the turntable. An O-ring made of a rubber member, a steel ball placed around the outer circumference of the O-ring for holding the disk by the spring force of the O-ring, the spacer, the O-ring and the steel ball A case for holding it above, and a fixed spring member for holding the claw portion at the tip by the turntable and fixing the spacer, the O-ring, the steel ball, and the case to the turntable without adhering to each other. It is equipped with and.

[0009]

According to the present invention having the above structure, the spacer, the O-ring, the steel ball, and the case can be incorporated into the turntable without using the adhesive method by inserting the claw portion at the tip of the fixed spring member into the turntable. Therefore, it is possible to realize a disc clamp device of a disc reproducing device which is easy to assemble, thin, highly accurate, and has a small number of parts.

[0010]

Embodiments of the present invention will be described in detail below with reference to FIGS. FIG. 1 is an exploded perspective view of a disc reproducing apparatus according to the first embodiment of the present invention. FIG. 2 is a sectional view showing the assembled state of the disc reproducing apparatus according to the first embodiment of the present invention. Figure 3
FIG. 3A is an assembly view of a top view of the disc reproducing apparatus according to the first embodiment of the present invention. FIG. 3B is an exploded perspective view of the spindle portion of the disc reproducing apparatus according to the first embodiment of the present invention. FIG. 4 (a) shows an assembled view of a back view of the disc reproducing apparatus in the first embodiment of the present invention. FIG. 4B is an exploded perspective view of the optical pickup feeding mechanism portion of the disc reproducing apparatus according to the first embodiment of the present invention.

1 to 4, 1 is a traverse base, 2 is a traverse motor, 3 is an optical pickup, 4 is a feed nut, 5 is a nut plate, 6 is a motor gear, 7 is a motor frame, 8 is an intermediate gear shaft, 9 is an intermediate gear, 10 is a retaining ring, 11 is a bearing, 12 is a drive shaft, 13 is a drive gear, 14 is a thrust spring, 15 is a spindle motor, 1
6 is a spindle motor mounting plate, 17 is a disk, 18 is a spindle motor mounting screw, 19 is a guide shaft, 20 is a turntable assembly, 26 is a turntable, 34 is a spacer, 35 is an O ring, 36 is a steel ball, 37
Is a case, and 38 is a piece holder having a claw at its tip.

The operation of the disc clamp device of the disc reproducing device constructed as described above will be described below. A spindle motor mounting plate 16 is accurately mounted on the traverse base 1. A turntable assembly 20 is precisely attached to a spindle motor 15 attached to a spindle motor attachment plate 16 at a prescribed height, and a disc 17 is rotated at a prescribed rotation speed. A motor gear 6 is fixed to the traverse motor 2, and an intermediate gear 9 meshed with the motor gear 6 transmits the rotational force of the traverse motor 2 to the drive gear 13.
Further, the drive gear 13 is fixed to the drive shaft 12, and by fitting the drive shaft 12 and the feed nut 4 fixed to the optical pickup 3, the optical pickup 3 is moved in the disc tracking direction, and the disc 17 of the disc 17 is moved. Read the signal.

The turntable assembly 20 includes a turntable 26 for mounting the disk 17, a spacer 34 fitted to the turntable 26, an O-ring 35 made of a rubber member, and an outer peripheral portion of the O-ring 35. Placed O
The steel ball 36 for holding the disk 17 by the spring force of the ring 35, the spacer 34 and the O-ring 35
And a case 37 for fixing the steel ball 36 on the turntable 26, and a claw portion at the tip is held by the turntable 26, and the spacer 34, the O-ring 35, the steel ball 36, and the case 37 are not adhered to each other. It is composed of a piece holder for fixing to the disk 26 and can accurately hold the disk 17 without using an adhesive method. As described above, according to this embodiment, the spacer 34, the O-ring 35, the steel ball 36, the case 37, and the piece holder 38 are used, and the magnetic force and the adhesive method are not used.
It is possible to realize a disc clamping device of a disc reproducing device which is easy to assemble, is thin, has high accuracy, and has a small number of parts. Although the turntable 26 and the spacer 34 are separate parts in the first embodiment, they may be integrated parts.

[0014]

As described above, according to the present invention, the steel ball and the O-ring are used to reduce the number of parts, and the claw portion at the tip of the fixed spring member is held by the turntable, so that the spacer and the O-ring are provided. Since the steel ball and case can be built into the turntable without using the adhesive method, the assembly work is easy and the thin type,
It is possible to realize a disc clamp device of a disc reproducing device with high accuracy and a small number of parts.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a disk reproducing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an assembled state of the disc reproducing apparatus according to the first embodiment of the present invention.

FIG. 3A is an assembly view of a top view of the disc reproducing apparatus according to the first embodiment of the present invention. FIG. 3B is an exploded perspective view of the spindle portion of the disc reproducing apparatus according to the first embodiment of the present invention.

FIG. 4A is an assembly view of a back view of the disc reproducing apparatus according to the first embodiment of the present invention. (B) is an exploded perspective view of an optical pickup feeding mechanism portion of the disc reproducing apparatus in the first embodiment of the present invention.

FIG. 5 is an exploded perspective view of a disc clamp mechanism of a conventional disc reproducing device.

FIG. 6 is a cross-sectional view of an assembly view of a disc clamp mechanism of a conventional disc reproducing device.

FIG. 7 (a) is an assembly view of a top view of the disc reproducing apparatus according to the first embodiment of the present invention. FIG. 3B is an exploded perspective view of the spindle portion of the disc reproducing apparatus according to the first embodiment of the present invention.

FIG. 8 (a) is an assembly view of a back view of the disc reproducing apparatus in the first embodiment of the present invention. (B) is an exploded perspective view of an optical pickup feeding mechanism portion of the disc reproducing apparatus in the first embodiment of the present invention.

[Explanation of symbols]

 1 Traverse Base 2 Traverse Motor 3 Optical Pickup 4 Feed Nut 5 Nut Plate 6 Motor Gear 7 Motor Frame 8 Intermediate Gear Shaft 9 Intermediate Gear 10 Retaining Ring 11 Bearing 12 Drive Shaft 13 Drive Gear 14 Thrust Spring 15 Spindle Motor 16 Spindle Motor Mounting Plate 17 Disc 18 Spindle motor mounting screw 19 Guide shaft 20 Turntable assembly 21 Motor block fixing screw 26 Turntable 34 Spacer 35 O-ring 36 Steel ball 37 Case 38 Piece holder

Claims (1)

[Claims] 1. A turntable on which a disc is mounted, a spacer fitted in a fitting portion of the turntable with high precision, an O-ring made of a rubber member, and the O-ring placed around the outer circumference of the O-ring. A steel ball for holding the disc by the spring force of the disk, a case for holding the spacer, the O-ring and the steel ball on the turntable, and a spacer for holding the tip claw portion by the turntable. And a fixing spring member for fixing the O-ring, the steel ball, and the case to the turntable without adhering the case to each other.