JPH05109001A - Turntable device of disk reproduction apparatus - Google Patents

Abstract

PURPOSE:To realize and provide a constitution wherein problems such as a dislocation and the like due to a strong shock and a fall are not caused by means of a constitution wherein its assembly operation is easy, it is thin, its accuracy is high, the number of its components is small and its cost is low in a turntable device which holds a disk in a disk reproduction apparatus. CONSTITUTION:In the coupling method of a turntable 14 on which a disk is mounted to an output shaft 7 for a spindle motor 3, the tip of the output shaft 7 is covered with a cap 20, the cap 20 and the turntable 14 are united by means of an ultrasonic welding technique or the like, and a coupling part 21 for preventing the dislocation of a turntable assembly body 8 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable device for accurately mounting a disc in a disc reproducing device of a type in which a light spot is projected on a disc-shaped recording medium to optically record and reproduce information. It is a thing.

[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 / multi-laser players year by year, and have become higher in performance, higher in quality and higher in added value. In particular, in the compact disc reproducing device, the demands for portable and on-vehicle devices are greatly increasing, and further miniaturization, thinness and cost reduction are required. A turntable device of a conventional disc reproducing device will be described below with reference to the drawings.

FIG. 8 shows an exploded perspective view of a turntable device of a conventional disc reproducing apparatus, and FIG. 9 shows a sectional view of an assembly view of a turntable device of the conventional disc reproducing apparatus.

In FIGS. 8 to 9, a motor mounting plate 4 is mounted on the base 1 with screws 9. The spindle motor 3 is attached to the motor attachment plate 4 with a motor screw 6. A turntable assembly 8 is press-fitted and fixed to the spindle motor 3 at a prescribed height to rotate the disk 5 at a prescribed speed. The optical pickup is moved in the tracking direction of the disk 5, and the signal of the disk 5 is read. In the turntable assembly 8, a centering spring 16 that pushes up a centering ring 17 that performs centering of the disk 5 is incorporated in the turntable 14 made of resin. A clamper 11 made of a magnetic material, to which a protective sheet 10 is attached so as to sandwich the disk 5, is provided with a clamper shaft 13 and a clamper receiver 13 via a clamper shaft 12.
Supported by. Magnet 1 for attracting the clamper 11 by magnetic force when the disk 5 is mounted
The magnet 5 is fixed to the magnet fixing plate 18 and the turntable 14 with an adhesive material.

In the turntable device of the conventional disc reproducing apparatus having the above-described structure, the turntable assembly 8 is press-fitted and fixed to the output shaft 7 of the spindle motor 3 to have an accurate height with respect to the optical pickup. It is required to be fixed with high accuracy, securely hold and mount the disk 5, and perform a rotating operation with less surface wobbling.

[0006]

However, in the conventional structure, since the turntable and the output shaft of the spindle motor are fixed only by press fitting the resin-molded turntable, the turntable is held to the output shaft. There was a problem of low strength. In particular, in a portable type disk reproducing device that is required to be thin and lightweight, the structure in which the turntable is fixed to the output shaft of the spindle motor from the side by screwing or the like cannot be realized due to space restrictions. ..

Generally, in a disk reproducing apparatus, the rotation and surface wobbling accuracy of the disk mounting surface of the turntable are required to be very high. In the resin molded turntable, in order to minimize the amount of runout of the disk mounting surface, the molding die structure is integrated from the disk mounting surface side, and the center hole is used to press fit into the output shaft of the spindle motor of the turntable. Had to be formed. Therefore, the center hole of the turntable has a conventional through hole shape, and the locking portion for the output shaft of the spindle motor cannot be formed only by the turntable. As a result, particularly in the case of a portable type disk device, there is a problem that the turntable will be displaced if it is accidentally dropped or pressed while being carried or used, and correct playback operation cannot be performed. there were.

The present invention has been made in view of the conventional problems, and an object thereof is to provide a turntable device of a disk reproducing device which has a small number of parts, high precision, high quality, and is easy to assemble.

[0009]

In order to solve the above problems, in a turntable device of a disk reproducing apparatus of the present invention, a tip of a turntable press-fitted and fixed to an output shaft of a spindle motor covers the output shaft. A cap is attached and fixed to the and the locking portion for the output shaft of the turntable is provided.

As another means, the tip portion of the turntable press-fitted and fixed to the output shaft of the spindle motor is
It is characterized in that the output shaft is deformed so as to be covered, and a locking portion for the output shaft of the turntable is provided.

[0011]

According to the present invention, with the above configuration, only the resin turntable and the output shaft of the spindle motor are press-fitted and fixed,
In addition to the holding strength of the supported turntable, the holding force generated by covering the tip of the output shaft of the spindle motor with a component such as a cap and fixing the cap and the turntable is added. Further, the turntable holding strength is strengthened by deforming the tip of the turntable press-fitted and fixed to the output shaft of the spindle motor so as to cover the output shaft and providing a locking portion for the output shaft of the turntable. Is possible.

At these times, by keeping the conventional dimensional relationship of press-fitting and fixing the turntable to the output shaft of the spindle motor, it is not affected by fixing the cap or deforming the tip of the turntable. In addition, it becomes possible to maintain the runout of the turntable and the height accuracy.
Therefore, it is possible to realize a turntable device that does not cause positional displacement of the turntable portion, which is a problem with strong impact force, pressing force, and drop, and is stable and does not have surface wobbling.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is an exploded perspective view of a turntable device of a disc reproducing apparatus according to an embodiment of the present invention. FIG. 3 is a sectional view showing an assembled state of a turntable device of a disc reproducing apparatus according to an embodiment of the present invention, and FIGS. 4 and 5 are partially enlarged sectional views showing a method of assembling the turntable device. is there. FIG. 1 shows the assembly of the feed mechanism of the optical pickup 2 according to the present invention. 1 to 5, a motor mounting plate 4 is accurately mounted on the base 1. The output shaft 7 of the spindle motor 3 mounted on the motor mounting plate 4 has a turntable assembly 8
Press-fit and fix to the specified height. A rib 22 and a common hole 23 are formed in the cap 20. After the cap 20 is inserted into the turntable 14, the rib 22 is melted by ultrasonic welding with the horn (A) 24, and the part of the turntable 14 that abuts the rib 22 is also melted. The table 14 is fixed. At this time, by constructing and assembling the engaging portion 21 of the cap 20 and the tip of the output shaft 7 of the spindle motor 3 to be in contact with each other, it is possible to obtain the effect of preventing the positional displacement of the turntable assembly 8. Cap 20 and turntable 1
Turntable assembly 8 in the ultrasonic welding work of No. 4
The effect of maintaining the press-fitting dimension relationship of the conventional turntable 14 and the force of the horn (A) 24 pressing the cap 20 against the turntable 14 is to concentrate the ultrasonic vibration on the cap 20. Since the rib 22 is provided, the ultrasonic welding work can be performed with about 1/10 or less of the holding force of the turntable assembly 8 which is press-fitted and fixed in advance.
The surface runout accuracy of the turntable assembly 8 and the press-fitting height accuracy do not cause any problems. Further, the central through hole 23 provided in the cap 20 is for avoiding some strain and stress concentration which occur in the cap 20 during ultrasonic welding. Further, by providing the through hole 23, the cap 20 and the turntable 14 are integrated in advance, and then the turntable assembly 8 is attached to the spindle motor 3.
Even when the assembly method of press-fitting into the output shaft 7 is adopted, the common hole 23 can provide the effect of air escape at the time of press-fitting. Further, when a gap is created between the cap 20, the locking portion 21 and the output shaft 7 due to a work variation of ultrasonic welding of the cap 20, or the like, an adhesive is injected from the common hole 23 to fill the gap. Positional deviation of the turntable assembly 8 can be prevented.

Further, by forming the melting rib 27 shown in FIG. 5 on the cap 20, the welding of the cap 20 and the turntable 14 is surely performed by the rib 22, and the melting rib 27 is fixed by the tip of the output shaft 7. , Melt by ultrasonic,
Since the gap between the locking portion 21 of the cap 20 and the output shaft 7 is filled, it is possible to reliably prevent the position displacement of the turntable assembly 8.

The cap 20 can be made of the same material as the turntable 14 to enhance the welding effect.

FIG. 6 is a sectional view showing an assembled state of a turntable device of a disc reproducing apparatus according to another embodiment of the present invention, and FIG. 7 is a partially enlarged sectional view showing an assembling method of the turntable device. is there. 6 to 7, the motor mounting plate 4 is accurately mounted on the base 1. Spindle motor 3 mounted on motor mounting plate 4
The turntable assembly 8 is assembled to the output shaft 7 of the above at a prescribed height. A protrusion 25 is provided at the tip of the turntable 14, and the horn (B) 26 for ultrasonic welding is provided.
By pressing, the projecting portion 25 is deformed and the tip of the output shaft 7 of the spindle motor 3 is covered, so that the locking portion 21 for the output shaft 7 of the turntable assembly 8 can be formed. At this time, the pressing force of the horn (B) 26 against the turntable 14 is about 1/10 of the holding force of the turntable assembly 8 which is press-fitted and fixed in advance, and the pressing force of the conventional turntable 14 is reduced. In addition to maintaining the press-fitting-related dimension of the output shaft 7 and deforming the protrusion 25, the surface runout and height dimension accuracy of the turntable assembly 8 are not affected.

[0018]

According to the present invention having the above-mentioned structure, parts such as a cap are fixed to the turntable assembly press-fitted to the output shaft of the spindle motor by a technique such as ultrasonic welding, or the protrusion of the turntable. By providing a locking part for the output shaft of the spindle motor of the turntable assembly by deforming, there is no surface wobbling problem, the press-fitting height accuracy is good, easy assembly is possible, impact force,
With a mechanism that is stable against pressing force and dropping, it is possible to realize a thin, high-performance turntable device.

[Brief description of drawings]

FIG. 1 is a diagram showing an optical pickup feeding mechanism section of a disc reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a turntable device of the disc reproducing apparatus of the present invention.

FIG. 3 is a sectional view of the assembly.

FIG. 4 is an enlarged sectional view of the same portion.

FIG. 5 is an enlarged sectional view of the same portion.

FIG. 6 is an assembled sectional view showing another embodiment of the turntable device of the disc reproducing apparatus of the present invention.

FIG. 7 is an enlarged sectional view of the same portion.

FIG. 8 is an exploded perspective view showing a turntable device of a conventional disc reproducing device.

FIG. 9 is a sectional view of the assembly.

[Explanation of symbols]

 1 Base 2 Optical Pickup 3 Spindle Motor 4 Motor Mounting Plate 5 Disk 6 Motor Screw 7 Output Shaft 8 Turntable Assembly 14 Turntable 20 Cap 21 Locking Part 22 Rib 23 Common Through Hole 24 Horn (A) 25 Projection 26 Horn ( B) 27 molten rib

Claims (2)

[Claims] 1. A part such as a cap that covers the tip of the output shaft is fixed to a turntable on which a disk fixed to the output shaft of a spindle motor is mounted, and a locking portion of the turntable for the output shaft is provided. A turntable device for a disk reproducing device, characterized in that 2. A turntable for mounting a disk fixed to an output shaft of a spindle motor is deformed so as to cover the output shaft, and a locking portion for the output shaft is provided. Turntable device for disc playback device.