JPH08249770A - Recording disk clamping device - Google Patents

Abstract

PURPOSE: To securely prevent a recording disk from slipping at the time of its clamping by a simple structure without becoming large in size. CONSTITUTION: A turntable 2 and a chucking pulley 7 are integrally rotated through the recording disk D by engaging an engagement hole 16 with a pin body 12, so that clamping of the recording disk D is stabilized, and the recording disk D is prevented from slipping. Moreover, energizing force is applied to the pin body 12 by a leaf spring 11 in the direction of engaging with the engagement hole 16, thus ensuring the engagement, preventing the chucking pulley 7 from floating above the recording disk D and eliminating misclamping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording disk clamping device for closely adhering a recording disk such as a magnetic disk, an optical disk or a magneto-optical disk to a turntable.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view of a conventional clamp device adopting the technique disclosed in Japanese Patent Application Laid-Open No. 4-125845. D is a recording disk and 1 is an output of a spindle motor (not shown). A shaft, 2 is a turntable whose central portion is fixed to the output shaft 1, 3 is a support wheel portion of the turntable 2 which supports the recording disk D, 4 is supported by the output shaft 1 and is incorporated in the turntable 2. A centering member 5 for positioning the recording disk D, 5 a spring for urging the centering member 4 upward, 6 a permanent magnet provided above the centering member 4, and 7 facing the turntable 2. Chucking pulley, 8
Is provided in the center of the chucking pulley 7, and the permanent magnet 6
The iron plate 9 adsorbed by the is a high friction member which is provided on the upper portion of the support wheel portion 3 and is in contact with the recording disk D.

In the clamp device having the above-mentioned structure, the recording disk D is clamped by the permanent magnet 6 attracting the iron plate 8 to join the turntable 2 having the centering member 4 and the chucking pulley 7. Was there. Therefore, in order to prevent the recording disk D from slipping with respect to the turntable 2 during rotational speed change, the frictional force due to the attraction force between the permanent magnet 6 and the iron plate 8 must be larger than the rotational speed change torque. .

However, if the attraction force is increased in order to increase the frictional force, it is necessary to use a permanent magnet 6 made of an expensive high-performance material. Also,
If the attraction force is increased, there is a problem that the load when unloading the recording disc D from the turntable 2 is increased and the reliability of the disc loading mechanism is lowered. Further, in the optical disc made of a plastic substrate, the attraction force is increased. Is too large, it will bend and record,
There is a problem of degrading the quality of reproduction.

Therefore, conventionally, slippage is prevented by interposing a high-friction member 9 in the contact surface portion between the turntable 2 and the recording disk D without increasing the suction force, and rotation shift is supported. .

[0006]

However, in order to realize access at a higher speed than in the conventional case, the rotational speed change must be completed in a shorter time, the rotational speed change torque becomes large, and the turntable is simply increased. Slip cannot be prevented only by installing the friction member. Therefore, the conventional device has a limit in shortening the access time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording disk clamping device which is simple and does not become large in size, and which can surely prevent slipping of the recording disk during clamping.

[0008]

In order to achieve the above object, the present invention is a recording disk provided with a turntable for rotatably supporting the recording disk and a chucking member for closely contacting the recording disk with the turntable. In the clamping device of the above, a fitting hole is provided in one of the turntable and the chucking member, and a pin body that fits into the fitting hole is provided in the other, and the pin body is fitted into the fitting hole. It is characterized in that an elastic member for urging in the direction is provided.

In the above-mentioned recording disk clamping device, the turntable and the chucking member are provided with annular magnets magnetized in multiple poles at substantially equal pitches, and the magnetized portions facing each other in multiple poles are provided. It is characterized in that the polarities are opposite to each other.

Further, the chucking member is provided with a positioning member for positioning the recording disk in the radial direction.

[0011]

In the recording disk clamping device according to the present invention having the above-described structure, since the turntable and the chucking member rotate integrally with the fitting hole and the pin body, the recording disk can be clamped stably. The recording disk can be prevented from slipping, and the pin body is biased by the elastic member in the direction of fitting with the fitting hole, so the fitting is secure and the chucking member floats above the recording disk. It is possible to prevent it from getting stuck and eliminate clamping mistakes.

Further, the turntable and the chucking member are provided with annular magnets which are magnetized in multiple poles, so that the turntable and the chucking member are passed over the entire circumference of the turntable and the chucking member by the attraction force of the magnets. The recording disc in the thrust direction,
It is securely clamped so that it does not move in the direction of rotation.

By providing the chucking member with a positioning member for positioning in the radial direction with respect to the recording disk, the positioning member can be eliminated from the turntable. Therefore, the member protruding to the disk mounting side of the turntable can be eliminated. In addition, the space for escaping the contact with the turntable at the time of inserting and ejecting the recording disk can be made smaller, and the loading stroke can be made smaller, making the device thinner,
The size can be reduced.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In each figure, members corresponding to those described in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a sectional view of a first embodiment of the present invention, in which a permanent magnet 10 is provided in the vicinity of a support wheel portion 3 of a turntable 2 and an elastic member is provided in an upper recess 4a of a centering member 4. A pin body 12 biased upward by a leaf spring 11 is provided. A magnetic material 13 such as iron attracted to the permanent magnets 10 and a high friction member 14 that contacts the recording disk D are provided on the lower peripheral portion of the chucking pulley 7 that is installed opposite to the turntable 2. Further, the central protrusion 7a of the chucking pulley 7 has a central hole 15 for positioning the chucking pulley, which is fitted with the output shaft 1 of the spindle motor (not shown), and the pin body adjacent to the central hole 15. A fitting hole 16 for fitting with 12 is formed.

At the time of clamping, the central hole d of the recording disk D is fitted and positioned with the outer periphery of the centering member 4, and moreover, the permanent magnet 10 attracts the magnetic material 13 and the recording disk D.
The turntable 2 and the chucking pulley 7 are joined to each other via, and the pin body 12 is fitted in the fitting hole 16.
In this state, hold the recording disk D and turntable 2
The chucking pulley 7 and the chucking pulley 7 rotate together. The slip of the recording disc D is prevented by the frictional force between the turntable 2 and the recording disc D and the frictional force between the chucking pulley 7 and the recording disc D, and a reliable clamping is performed.

When clamping, the pin body is not always required.
Although the 12 and the fitting hole 16 are not always in the position where they are fitted to each other,
Even in that case, the pin body 12 is pushed downward by the descending chucking pulley 7 against the urging force of the leaf spring 11, and when the output shaft 1 rotates, the recording disk D and the chucking pulley 7 are rotated.
And will rotate with respect to the turntable 2, so that when the pin body 12 reaches the position of the fitting hole 16, the leaf spring 11 is urged upward to fit into the fitting hole 16. The pin body 12 can be prevented from floating without being fitted.

FIG. 2 is a sectional view of a second embodiment of the present invention. In the second embodiment, a circle is formed in the vicinity of the support wheel portion 3 of the turntable 2 and the lower peripheral portion of the chucking pulley 7. Annular permanent magnets 20 and 21 are provided, a high friction member 14 that comes into contact with the recording disk D is provided on the lower peripheral portion of the chucking pulley 7, and the chucking pulley 7 is provided.
A central hole 15 for positioning the chucking pulley that fits with the output shaft 1 of the spindle motor is formed in the central protrusion 7a.

FIG. 3 is a perspective view for explaining the annular permanent magnet, in which both permanent magnets 20 and 21 are magnetized in multiple poles at a substantially equal pitch (the case of 6 poles is shown in the figure). , Both permanent magnets 2
The facing multi-pole magnetized portions of 0 and 21 have opposite polarities.

When clamped, the N pole and S of both permanent magnets 20 and 21
The poles are attracted to each other, and the turntable 2 and the chucking pulley 7 are joined to each other via the recording disk D. In this state, the recording disk D is held and the turntable 2 and the chucking pulley 7 move in the thrust direction. It does not move easily in the direction of rotation, and in the radial direction the output shaft 1 and the central hole 15
Since and do not move, they rotate integrally.
Therefore, the frictional force between the chucking pulley 2 and the recording disc D acts as a disc slip preventing force, and the reliable clamping is performed as in the first embodiment.

FIG. 4 is a sectional view of the third embodiment of the present invention. In the third embodiment, the output of the spindle motor is urged downward by a spring 30 at the lower center of the chucking pulley 7. A centering receiver 32 as a recording disk positioning member provided with a central hole 31 for positioning a chucking pulley that fits with the shaft 1 is installed. Further, similarly to the second embodiment, a support for the turntable 2 is provided. Annular permanent magnets 20 and 21 are provided in the vicinity of the wheel portion 3 and the lower peripheral portion of the chucking pulley 7, and the lower peripheral portion of the chucking pulley 7 has high friction that contacts the recording disk D. A member 14 is provided.

As in the third embodiment, the centering receiver 32, which is a recording disk positioning member that fits in the central hole d of the recording disk D and positions in the radial direction, is provided on the chucking pulley 7 side. By eliminating the recording disk positioning member from the turntable 2, the height of the turntable 2 can be reduced to that extent.
The upper end portion of the support wheel portion 3 is the highest. Therefore, the turntable 2 receives the recording disk D from the outside of the loading device equipped with the present embodiment.
The space for escaping the contact between the recording disk D and the turntable 2 can be reduced when the recording disk D is moved and placed on the upper surface or ejected to the outside of the apparatus. It is possible to reduce the amount of movement to), and to reduce the thickness and size of the entire device. The chucking pulley 7 itself is positioned by fitting the output shaft 1 and the central hole 31.

Also in the first embodiment, the recording disk positioning member is attached to the chucking pulley 7 as in the third embodiment.
It can be installed at the same position and similar effect can be obtained.

[0024]

As described above, the clamp device for a recording disk according to the present invention has the structure described in claim 1.
By fitting the pin body and the fitting hole, the turntable and the chucking member can hold the recording disk securely and integrally rotate, and the elastic member ensures the fitting. Slip can be prevented and the reliability of the clamp can be improved.

According to the second aspect of the present invention, the recording disk is held by the turntable and the chucking member using the annular magnets magnetized in multiple poles at substantially equal pitches, so that the entire area in the circumferential direction is held. It is possible to prevent the slip of the recording disk with a simple structure, and it is possible to improve the reliability of the clamp.

According to the third aspect of the present invention, since the positioning member for positioning the recording disk in the radial direction can be omitted from the turntable, there is no portion protruding above the disk mounting surface of the turntable. Therefore, the space for escaping the contact at the turntable portion at the time of inserting and ejecting the recording disk can be made small, and therefore the loading stroke can be made small, so that the apparatus can be made thin and compact.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of a recording disk clamping device according to the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a perspective view of an annular magnet according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a third embodiment of the present invention.

FIG. 5 is a sectional view of a conventional clamp device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Output shaft, 2 ... Turntable, 3 ... Support wheel part, 4 ... Centering member, 7 ... Chucking pulley, 10 ... Permanent magnet, 11 ... Leaf spring, 12 ... Support wheel part, 13 ... Magnetic material, 14 ... High friction member, 1
5, 31 ... central hole, 16 ... fitting hole, 20, 21 ... annular permanent magnet, 32 ... centering receiver, D ... recording disk.

Claims (3)

[Claims] 1. A recording disk clamping device comprising a turntable for rotatably supporting a recording disk and a chucking member for bringing the recording disk into close contact with the turntable, wherein either the turntable or the chucking member is provided. A fitting hole is provided on one side, a pin body that fits the fitting hole is provided on the other side, and an elastic member that urges the pin body in the direction of fitting the fitting hole is provided. Recording disk clamp device. 2. A recording disk clamping device comprising a turntable for rotatably supporting a recording disk and a chucking member for bringing the recording disk into close contact with the turntable, wherein the turntable and the chucking member include: A recording disk clamping device, characterized in that annular magnets that are magnetized in multiple poles at substantially equal pitches are provided, and the opposing magnetized portions of each magnet have opposite polarities. 3. The clamping device for a recording disk according to claim 1, wherein the chucking member is provided with a positioning member for positioning the recording disk in a radial direction.