JPH09106621A - Disk clamping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the mounting/demounting operation of a clamping assembly by securing a turn table assembly to a base plate and a magnetic body to the turn table assembly thereby increasing the clamping force. SOLUTION: In chucking a disk, a supporting plate 950 lowers to cause lowering of a clamping assembly CA and thereby a protrusion 800 lowers while touching a magnetic body 500 at the end of second inclining surface 830 on the bottom face thereof. Upon finishing the lowering, a metal member 900 secured to the clamping assembly CA touches the upper surface of a central coupling part 400 at the bottom face thereof, and the bottom face of a disk pressing part 750 is pressed against the upper surface of a disc. The magnetic body 500 attracts the metal member 900 and the disk pressing part 750 of clamping assembly CA is pressed stronger against the disc resting part 450 of a turn table assembly thus holding a disc firmly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamping device, and more specifically, a disk clamping device using a magnetic force provided between a turntable assembly and a metal member provided in the clamping assembly. The present invention relates to a disk clamping device for stably clamping a disk.

[0002]

2. Description of the Related Art Generally, a device such as an optical video disc player, a digital audio disc player, a compact disc player, etc. is a device for recording or reproducing data on a disc capable of magnetic recording or optical recording. In these devices, a disc to which various audio signals or video signals are input is mounted on the turntable assembly of the disc player, and the turntable mounted on the disc is rotated according to the rotation of the spindle motor to reproduce data. I do.
If the disc is shaken by an external impact, or if the disc is eccentrically mounted on the turntable and is driven, phenomena such as noise, sound segmentation, and jitter occur during data reproduction. For this reason, various disc clamping devices for clamping the disc on the turntable have been proposed.

Hereinafter, a conventional disk clamping device will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a vertical sectional view of a conventional disk clamping device, and FIG. 2 is a vertical sectional view of another conventional disk clamping device. First, as shown in FIG. 1, the disk clamping apparatus includes a clamping assembly equipped with a coil spring and a magnet for clamping the disk. The clamping assembly includes a main clamper 10 and an auxiliary clamper 20. The cylinder portion 11 of the main clamper 10 is opened at the upper and lower sides so that the turntable 40 can be inserted into the clamper 10. First fixing portion 12
Is formed by radially extending integrally from the upper portion of the outer peripheral surface of the cylinder portion 11, and has a groove for fixing the auxiliary clamper 20 to the main clamper 10. The first annular vertical wall portion 13 is formed by bending and extending vertically downward from the extended annular end portion of the first fixing portion 12, and together with the first fixing portion 12, forms a groove in which the auxiliary clamper 20 is received. The disc pressing plate 14 is formed by radially extending from the lower end of the first annular vertical wall portion 13 so as to press the disc 30. The second annular vertical wall portion 15 is formed by bending and extending vertically upward from a predetermined position at the end of the disc pressing plate 14, so that the magnet 17 can be received between the second annular vertical wall portion 15 and the first annular vertical wall portion 13. Form a groove. The second fixing portion 16 is formed by integrally extending radially from the upper portion of the outer peripheral surface of the second annular vertical wall portion 15 so that the main clamper 10 can be fixed on the support plate 5.

The cylinder portion 21 of the auxiliary clamper 20 is open at the top and bottom so that the cylinder portion 11 of the main clamper 10 can be inserted. Disk pressing unit 22
Are formed by radially extending from the lower portion of the outer peripheral surface of the cylinder portion 21 to press the disk 30. The spring receiving portion 23 is formed by bending and extending vertically upward from the extended annular end portion of the disc pressing portion 22, and
1 together with 1 form a groove in which the spring 25 is received. The locking portion 24 is provided so as to project from a part of the upper portion of the outer peripheral surface of the spring receiving portion 23 for coupling and fixing the auxiliary clamp 20 to the main clamp 10.

The magnet 17 is the first of the main clamper 10.
It is inserted into the groove formed by the annular vertical wall portion 13, the disc pressing plate 14, and the second annular vertical wall portion 15. In order to fix the inserted magnet 17 to the main clamper 10, the inner surface of the second annular vertical wall portion 15, the magnet 17, the upper surface of the first fixing portion 12, and the inner surface of the cylinder portion 11 may be covered. A metal member 18 which is open and has a cylindrical shape is used.

A cylinder portion 21 of the auxiliary clamper 20,
The spring 25 is inserted into the groove formed in the disc pressing portion 22 and the spring receiving portion 23. Spring 25
The auxiliary clamper 20 in which the auxiliary clamper 20 is inserted is pushed upward from the lower end of the first annular vertical wall portion 13 of the main clamper 10, so that the locking portion 24 of the auxiliary clamper 20 elastically moves the metal member 18 to the main clamper 10. Fixed to.
Therefore, the auxiliary clamper 20 is not arbitrarily separated from the main clamper 10.

When the disk 30 is placed on the turntable 40 by the clamping device shown in FIG. 1 and then the clamping assembly is operated, the hollow connecting portion 41 of the turntable 40 is changed into the cylinder portion 1 of the clamping assembly.
Inserted into 1. At this time, the disk 30 is fixed between the clamping assembly and the turntable 40 by the clamping force of the clamping assembly and the magnetic force of the magnet 17 fixed to the clamping assembly. Further, the disk 30 is elastically fixed between the clamping assembly and the turntable 40 by the auxiliary clamper 20 provided with the spring 25 that applies an elastic force toward the turntable 40.

Another conventional clamping device is shown in FIG. The clamping device shown in FIG. 2 includes a clamping assembly including a magnet and a turntable including a spring for clamping a disc. The clamping assembly 50 has a magnet 51 fixed by molding at a position where it comes into contact with a part of the surface of the disk 60.
including. A protrusion 52 of the clamping assembly 50 is provided on the lower surface of the clamping assembly 50 to center the clamping assembly 50 and the turntable assembly.

The turntable assembly includes a driving unit 80 for providing a rotational driving force, a turntable 70 on which the disc 60 is placed, and a disc for preventing lateral flow of the disc placed on the turntable assembly. The fixing part 90 is included. The drive unit 80 includes a drive motor 81 that generates a rotational force, and a rotary shaft 82 that is vertically installed at the center of the upper surface of the drive motor 81 and that rotates according to the rotation of the drive motor 81.

The turntable 70 is the first cylinder 7
1, disk support 72, annular vertical wall 73, and second
It includes a cylinder portion 74. The upper and lower sides of the first cylinder portion 71 are open so as to receive the rotation shaft 82 of the driving portion 80. The disc supporting portion 72 is formed to extend radially from the upper portion of the outer peripheral surface of the first cylinder portion 71 so as to support the disc 60. Annular vertical wall 7
3 is the disc support portion 7 for receiving the fixing portion 90.
It is formed by bending and extending vertically upward from the end of the extension portion in 2. The second cylinder portion 74 is the disc support portion 72.
Is formed to extend vertically upward from the upper surface of the first cylinder portion 71 and has a cylindrical shape having a diameter larger than that of the first cylinder portion 71. The four first coupling grooves 75 are arranged at equal intervals in the circumferential direction, and the annular vertical wall portion 73 of the turntable 70 is provided.
Is formed on the outer peripheral surface of the. The three second coupling grooves 76 are formed in a bent portion that connects the disc support portion 72 and the annular vertical wall portion 73 at equal intervals along the circumferential direction. The disc receiving portion 77 is formed in an annular shape separately from the turntable 70. The disc receiving portion 77 is formed in an annular shape so as to have a Z-shaped vertical cross section. The disc receiving portion 77 is fixed to the turntable 70 by fitting into the first coupling groove 75 of the annular vertical wall portion 73.

The disk fixing portion 90 includes a dome-shaped portion 91 that is open so that the upper portion and the lower portion have the same radius. The three legs 92 having the same distance are formed into the dome-shaped portion 9.
It is formed by bending and extending vertically downward from below the outer peripheral surface of 1, and the end of the extension is formed by bending at a right angle to the outside.
The spring receiving groove 93 is formed at a predetermined position on the bottom surface of the dome-shaped portion 91. The spring 94 is the dome-shaped portion 91.
Of the spring receiving groove 93. Spring 94
The plurality of legs 92 of the inserted disc fixing portion 90 are coupled to the second coupling groove 76 of the turntable 70, and thus the disc fixing portion 90 is fixed to the turntable 70.

In the clamping device having the above structure, when the disk 60 is placed on the turntable 70 and the clamping assembly 50 is operated, the disk 60 is attached to the magnet 51 and the disk mounted on the clamping assembly 50. Attractive force generated between the receiving portion 77,
And, the elastic force of the spring 94 inserted into the disc fixing portion 90 fixes the clamping assembly 50 and the turntable 70.

The conventional clamping device shown in FIGS. 1 and 2 is a device for fixing a disk by an attractive force between a magnet installed in the clamping assembly and a turntable assembly. In these devices, a clamping assembly including a heavy magnet is installed on a vertically movable support plate. However, in such a conventional clamping assembly, when the support plate moves during chucking of the disc and the clamper comes into contact with the upper surface of the disc, noise is generated by the clamper including the heavy magnet and the disc is damaged. Cause damage. Further, there is a problem that an excessive force is required to dechuck the disc due to the weight of the magnet.

[0014]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce noise generated during chucking or dechucking in a conventional clamping device, and to perform stable clamping without damaging the disc. It is to provide a clamping device.

[0015]

To achieve the above object, a disk clamping device according to the present invention comprises a drive motor for providing a rotational driving force for rotating a disk, and a drive that rotates according to the rotation of the drive motor. A driving part including a motor shaft; a central coupling part which is connected to the driving motor shaft and is inserted into the hollow of the disc, a disc mounting part where the disc is placed, and a central coupling part for clamping the disc. A turntable assembly including a magnetic body; a disk pressing portion for pressing the disk resting on the disk rest portion during chucking of the disk, a protrusion for centering the turntable, and chucking of the disk. In order to increase the clamping force of the disk by being attracted to the magnetic material, the magnetic material is paired with the magnetic material. And a clamping assembly including a metal member which is installed to.

The upper surface of the central connecting portion includes a first inclined surface inclined downward by a predetermined angle so as to be easily inserted into the hollow portion of the disk and the clamping assembly. The bottom surface of the protrusion includes a second inclined surface inclined by a predetermined angle upward from the outer peripheral surface of the protrusion to be easily inserted into the turntable assembly. Also, the protrusion includes a deviation preventing groove that prevents the protrusion from being displaced by being coupled to the drive motor shaft that is coupled to the upper surface of the center coupling portion of the turntable assembly when the disk is chucked.

In the disk clamping device according to the present invention, the turntable is fixed to the base plate,
Since the magnetic material is fixedly mounted on the turntable, the magnetic material is stable during chucking and dechucking of the disc, and noise generation and damage to the disc are prevented.
Also, in the clamping device according to the present invention, the clamper has a simple structure.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The clamping device of the present invention will be described in detail below with reference to the accompanying drawings. 3 and 4
As shown in FIG. 1, the disc clamping apparatus according to the present invention provides a driving unit for providing and transmitting a rotational driving force to a turntable, a turntable assembly (TA) capable of placing a disc on an upper surface, and a turntable assembly (T).
A) Includes a clamping assembly (CA) for clamping the disc resting on top.

The drive unit rotates to drive the drive motor 200 that provides rotational drive force, and to rotate the disk 100 according to the rotation of the drive motor 200.
Drive motor shaft 25 formed vertically above the upper surface of 00
Contains 0. The drive motor 200 is fixed to a stationary base plate 600. Turntable assembly (T
A) is a cylinder part 300, a magnetic material support part 350, a center coupling part 400, a disk storage part 450, and a magnetic material 50.
Contains 0. The cylinder part 300 is a drive motor shaft 250.
Are open at the top and bottom to receive and fix the. The drive motor shaft 250 is fixed by protruding from the upper surface of the cylinder part 300. The magnetic body support part 350 is integrally extended from the lower end of the outer peripheral surface of the cylinder part 300 toward the outside to support the magnetic body 500.

The center connecting part 400 is formed by bending and extending vertically upward from the upper surface of the magnetic material supporting part 350 so as to be connected to the hollow part 150 of the disk 100. The disc storage part 450 is formed to extend outward from the lower end of the outer peripheral surface of the center coupling part 400 so that the disc 100 can be stored. The magnetic body 500 is fixed to the annular groove formed by the cylinder portion 300, the magnetic body supporting portion 350, and the center coupling portion 400. The upper surface of the central connecting portion 400 is used to attach the central connecting portion 400 to the disc 1 when chucking the disc.
00 hollow part 150 and clamping assembly (C
It has a first inclined surface 410 inclined downward by a predetermined angle so as to be easily inserted into A). In the present invention, the magnetic body 500 is a permanent magnet.

The clamping assembly (CA) includes a main cylinder portion 700, a disk pressing portion 750, a protrusion 800,
And a metal member 900. The main cylinder part 700 is formed in a cylindrical shape with the upper part closed and the lower part opened. The main cylinder part 700 has a coupling part 730 for coupling and fixing the clamping assembly (CA) to the support plate 950 at the center of the upper surface. The main cylinder part 700 has a protrusion 800 vertically downward from the center of the upper surface of the turntable assembly (TA) so that it can be inserted into the center joint 400.

The protrusion 800 is the cylinder portion 30 of the turntable assembly (TA) when the disk is chucked.
0 is recessed in the center of the lower surface of the protrusion 800 so that the upper surface of the protrusion 0 and the lower surface of the protrusion 800 are fitted together without displacement.
50. The shift prevention groove 850 receives the upper portion of the drive motor shaft 250 fixedly coupled to protrude from the upper surface of the cylinder unit 300 of the turntable assembly (TA), and then the clamping assembly (CA) and the turntable assembly (TA). Center. The bottom surface of the protrusion 800 has a second inclined surface 830 inclined by a predetermined angle above the outer peripheral surface of the protrusion 800 so that the protrusion 800 can be easily inserted into the turntable assembly (TA). The disk pressure unit 750 is used for the disk 1 when the disk is chucked.
In order to pressurize 00, the main cylinder part 700 is formed by radially extending integrally from the lower end of the outer peripheral surface of the main cylinder part 700. The metal member 900 includes the inner peripheral surface of the main cylinder portion 700 and the protrusion 800.
Is fixed in the groove formed by the outer peripheral surface of the. In the present invention, the metal member 900 is a thin metal plate. The clamping assembly (CA) is fixed to a vertically movable support plate 950.

Hereinafter, the operation and effect of the clamping device according to the present invention will be described in detail. When reading data from the disc 100, first, the center coupling part 400 on the turntable assembly (TA) is inserted into the hollow 150 of the disc 100. The disc 100 rests on a disc rest 450 on the turntable assembly (TA).

The movable support plate 950 moves down when the disk is chucked. The clamping assembly (C) fixed to the support plate 950 according to the lowering of the support plate 950.
A) descends. As the clamping assembly (CA) descends, the main cylinder part 700 and the disk pressing part 7
The corner formed by 50 slides along the first sloping surface 410 of the turntable assembly (TA), whereby the clamping assembly (CA) and the turntable assembly (TA) begin to join.

Clamping assembly (CA) projection 8
The end of the second inclined surface 830 formed on the bottom surface of the magnet 00 is a magnetic body 50 fixed to the turntable assembly (TA).
It descends while touching 0. When the lowering of the second inclined surface 830 is completed, the bottom surface of the metal member 900 fixed to the clamping assembly (CA) contacts the top surface of the center coupling part 400.

The bottom surface of the disk pressing portion 750 of the clamping assembly (CA) presses the upper surface of the disk 100 seated on the disk rest portion 450 of the turntable assembly (TA). When the bottom surface of the metal member 900 contacts the top surface of the center coupling part 400, the magnetic member 500 is fixed to the clamping assembly (CA).
Attract 0. Accordingly, the disk pressing unit 750 of the clamping assembly (CA) further presses the upper surface of the disk 100 seated on the disk rest unit 450 of the turntable assembly (TA). Therefore, the disc 100 is firmly fixed between the clamping assembly (CA) and the turntable assembly (TA).

When the chucking of the disk is completed, the drive motor 200 starts rotating. Drive motor shaft 2
Since 50 is fixedly connected to the turntable, the turntable is rotated by the rotation of the drive motor 200. Depending on the rotation of the turntable, the disc storage part 45
The disc 100 seated on 0 rotates. Data is read from the rotating disc 100 by a data pickup device (not shown).

When the disk is dechucked, the vertically movable support plate 950 rises. As the support plate 950 rises, the clamping assembly (CA) fixedly installed on the support plate 950 starts to rise. When the clamping assembly (CA) starts rising, the above series of operations is performed in reverse.

[0029]

According to the present invention, the turntable assembly is fixed to the base plate, and the magnetic material is fixed to the turntable assembly. Therefore, the force required to detach the clamping assembly when chucking or dechucking the disc is smaller than the force required to detach the clamping assembly having the heavy magnetic material in the prior art. The attachment / detachment operation of the clamping assembly is stable.

In the disk clamping device according to the present invention, since the turntable is fixed to the base plate and the magnetic material is fixedly mounted on the turntable, the magnetic material does not vibrate during disk chucking and dechucking.
Generation of noise is prevented and damage to the disc is prevented. Also, in the clamping device according to the present invention, the clamper includes a light metal member, which simplifies the structure.

In addition, since the metal member is fixed to the clamping assembly in the disk clamping device of the present invention, the chucking force of the disk is generated by the magnetic force of the magnetic material fixed to the turntable assembly when the disk is chucked. Will be strengthened. Further, since the clamping assembly of the present invention is composed of only the clamper body and the thin metal member, the structure is simple as compared with the conventional clamping device including the clamper with the magnet.

Although the present invention has been specifically described based on the above-described embodiments, the present invention is not limited to this, and modifications and improvements can be made within the scope of ordinary knowledge of those skilled in the art. Of course.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a conventional disk clamping device.

FIG. 2 is a vertical cross-sectional view of another conventional disk clamping device.

FIG. 3 is a vertical sectional view of a clamping device according to the present invention.

FIG. 4 is a diagram showing a disk clamping state according to the present invention.

[Explanation of symbols]

 100 disk 150 hollow part 200 drive motor 250 drive motor shaft 300 cylinder part 350 magnetic material support part 400 central coupling part 410 first inclined surface 450 disk storage part 500 magnetic material 700 main cylinder part 730 coupling part 750 disk pressing part 800 protrusion Part 830 Second inclined surface 850 Shift prevention groove 900 Metal member 950 Support plate CA Clamping assembly TA Turntable assembly

Claims (7)

[Claims] 1. A drive means including a drive motor for providing a rotational drive force for rotating a disk and a drive motor shaft rotating in response to the rotation of the drive motor; A center coupling means inserted into the hollow, a disc retaining means on which the disc is placed, and a turntable assembly including a magnetic body provided on the center coupling means for clamping the disc; A disk pressing means for pressing the disk resting on the disk mounting means, a projecting means for centering the turntable, and a magnetic material provided at a position corresponding to the magnetic material to the magnetic material when chucking the disk. Includes a metal member that increases the clamping force of the disc when attracted. A disk clamping device, comprising: a clamping assembly; 2. The disk clamping device according to claim 1, wherein the magnetic body is a permanent magnet. 3. A first sloping surface on the upper surface of the center coupling means which is inclined outwardly at a predetermined angle so that the center coupling means can be easily inserted into the hollow of the disk and the clamping assembly. The disk clamping device according to claim 1, wherein the disk clamping device is formed. 4. The bottom surface of the protruding means is formed with a second inclined surface inclined by a predetermined angle upward from the outer peripheral surface of the protruding means so that the protruding means can be easily inserted into the turntable assembly. The disk clamping device according to claim 1, wherein the disk clamping device is a disk clamping device. 5. The protrusion means has a shift preventing groove so that the drive motor shaft projectingly coupled to the upper surface of the center coupling means of the turntable assembly and the projecting means are fitted to each other when the disk is chucked. The disk clamping device according to claim 1, wherein 6. The disk clamping device according to claim 1, wherein the metal member is a thin metal plate. 7. A drive means including a drive motor for providing a rotational drive force for rotating a disc and a drive motor shaft rotating in response to the rotation of the drive motor; A central coupling means having on its upper surface a hollow and a first inclined surface inclined downward by a predetermined angle so as to be easily inserted into the clamping assembly, a disk placing means for placing the disk, and the disk. A turntable assembly including a permanent magnet provided on the upper part of the central coupling means for clamping the disk; and a disk pressing for pressing the disk seated on the disk mounting means during chucking of the disk. Means, upwardly of the outer peripheral surface on the bottom surface so that it can be easily inserted into the turntable assembly. A second inclined surface inclined by a predetermined angle is formed on the lower surface of the projecting means so that the upper surface of the center coupling means of the turntable assembly and the lower surface of the projecting means fit together when the disk is chucked. A protrusion means for centering the turntable, which has a deviation preventing groove, and a position corresponding to the permanent magnet are provided, and the clamping force of the disc is increased by being attracted to the permanent magnet when chucking the disc. A clamping assembly including a thin metal plate;