JPH03283045A - Disk chucking device - Google Patents

Abstract

PURPOSE:To prevent slip of a disk without increasing the size and the magnetic attracting force of a turntable and a chuck pulley by applying multi-pole magnetization to both the turntable and the chuck pulley. CONSTITUTION:The poles N, S of a turntable 6 and the S, N poles of a chuck pulley 7 are respectively attracted at chucking of a disk. In this case, the magnetic attracting force caused between the turntable 6 and the chuck pulley 7 is comparatively large because the magnetic poles are alternately arranged even when the magnetic field strength of poles N, S is comparatively small. Moreover, if the turntable 6 and the chuck pulley 7 are going to be deviated in the direction of rotation, the pole N(S) of the turntable 6 and the pole S(N) of the chuck pulley 7 are attracted together and the pole N(S) of the turntable 6 and the pole N(S) of the chuck pulley 7 are repulsed with each other, then the deviation is regulated. Thus, slip of a disk is prevented without increasing the size and the magnetic attracting force of the turntable and the chuck pulley.

Description

[Detailed description of the invention] (b) Industrial usage total The present invention relates to a disk chucking device.

(b) Conventional technology A so-called magnetic chucking type disc chucking device that clamps a disc using magnetic force is
For example, it is used in compact disc players. Such a chucking device chucks a disk using magnetic force 111 and force generated between the turntable and the chuck pulley. A magnetic material is placed on the turntable and chuck boot to generate magnetic attraction force. In addition, there are devices in which the turntable and chuck boot itself are made of magnetic material (for example, Japanese Patent Laid-Open No. 63
(Refer to Publication No.-195856).

(C) Problems to be Solved by the Invention In the case of such a chucking device, the driving force of the disk drive motor is transmitted to the disk by the I41 friction force between the turntable and the disk. Further, the driving force of the motor is transmitted to the chuck pulley by the frictional force between the disk and the chuck boot. In this way, the disk ＼
Since the driving force of the motor is transmitted through frictional force, if a relative acceleration occurs between the disk and the turntable when the disk is rapidly driven or stopped, slippage will occur between the disk and the turntable. This inconvenience can be solved by increasing the magnetic adsorption force between the turntable and the chuck pulley to increase the frictional force between the disk and the turntable, but in this case, the turntable and chuck pulley must be made larger. Must be. Furthermore, increasing the suction force in this manner causes the disadvantage that it becomes difficult to release the suction between the turntable and the chuck pulley when the disc is unloaded.

Therefore, the present invention provides a disk chucking device that can obtain a large magnetic attraction force without increasing the shape of the turntable and chuck brake, with the main premise of preventing the disk from slipping. The first task is to do so.

A second object of the present invention is to provide a disk chucking device that can prevent the disk from slipping without increasing the magnetic attraction between the turntable and the chuck pulley.

(d) Means for Solving the Problems In view of the above problems, the present invention provides a disk chucking device that uses magnetic force to chuck a disk.
Both the turntable and chuck pulley are characterized by multi-pole magnetization.

A second feature of the disk chucking device is that the turntable and chuck pulley are multi-pole magnetized in the rotational direction.

(E) Effect According to the first feature, even if the magnetic elevation strength of the turntable and chuck pulley is relatively small, a large magnetic attraction force can be generated between them.

According to the second feature, the turntable and the chuck pulley are magnetically connected in their respective rotational directions and become a single unit, so that the frictional force applied to the disk is transmitted from both the turntable and the chucking pulley. As a result, the disc is affected by the frictional force added from the chucking pulley.
Slippage becomes less likely to occur.

(F) Examples Various examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a disc playback device, in which a spindle motor 2, a pickup 3, a thread feed motor 4, a thread feed mechanism 5, etc. are attached to a chassis 1. A turntable 6 is attached to the rotating shaft of the spindle motor 2, and a chuck pulley 7 is disposed above the turntable via a bracket (not shown). The turntable 6 and the chuck pulley 7 are made of a magnetic material, and when a disk is placed on the turntable 6, the turntable 6 and the chuck pulley 7 are moved in the direction of the bracket turntable as described in j. The disk is chucked by the magnetic attraction force generated between the two.

Figures 2, 3 and 4 each show a turntable 6.
and shows an example of the magnetized state of the chucking pulley 7. The upper side is a view of the chucking pulley seen from the bottom side, and the lower side is a top view of the turntable.

In FIG. 2, the turntable and the chucking boot are magnetized by alternately applying N poles and 5fii to each other in 30° increments. In this embodiment, during disk chunking, the north and south poles of the turntable and the south and north poles of the chucking pulley come into contact with each other. In this case, the magnetic attraction force generated between the turntable and the chucking pulley is relatively large because the magnetic poles are arranged at the intersection 17 even if the magnetic field strength of the N and S poles is relatively small. Also, if the turntable and the chucking boot try to shift in the direction of rotation, the turntable's N pole (Si)
5ffi (N pole) of the chucking pulley attract each other, and the N pole (S pole) of the turntable and the N pole (S pole) of the chucking pulley repel each other, so this deviation is regulated. Ru. Therefore, the turntable and the chucking pulley are substantially connected in the rotational direction. In this case, the disc chucked by the turntable and the chucking pulley receives driving force from both the turntable and the chucking pulley due to the frictional force between the turntable and the disc and between the chucking pulley and the disc. .

This makes it difficult for the disc to slip on the turntable.

The embodiment shown in FIG. 3 is an example in which the turntable and the chucking pulley are magnetized concentrically.

Here, the north and south poles of the turntable are opposed to the south and north poles of the chucking pulley. In the case of this embodiment, since there is no change in magnetization in the rotational direction of the turntable and chucking pulley, even if the turntable and chucking pulley try to deviate in the rotational direction, this change will not occur as in the above embodiment. Action that attempts to regulate the deviation (
(magnetic repulsion of the same magnetic pole) does not occur. Therefore, in this embodiment, it is not possible to transmit the driving force from the chucking plate to the disk as in the above embodiment, and therefore it is not possible to prevent the disk from slipping as well as in the above embodiment.

However, in the case of this embodiment as well, since the N poles and S poles are arranged alternately as in the above embodiment, even if the magnetic field strength of each magnetic pole is relatively small, there is a large It is possible to generate magnetic attraction force. Therefore, even if such a large magnet is placed on the turntable and the chucking plate, it is possible to generate a chucking force sufficient to prevent the disk from slipping. Note that this embodiment also has the effect that the centers of the turntable and the chucking pulley always coincide.

The embodiment shown in Fig. 1 is a variation of the embodiment shown in Fig. 2 in which the center part is magnetized, and it is difficult to magnetize the protrusions formed on the turntable to determine the center of the disc. This is effective when changing the material of the fitting part disposed at the center of the chucking pulley.This embodiment can also produce the same effect as the embodiment shown in FIG.

Although various embodiments of the present invention have been described above, the present invention is not limited to these embodiments. for example,
The magnetization states of the turntable and the chucking boot may be other than those in the above embodiments. Further, in the above embodiment, the turntable and the chucking pulley themselves are made of a magnetic material, but instead of this, a magnetic material may be separately attached to the turntable and the chucking pulley.

(G) Effects of the Invention According to the present invention, it is possible to sufficiently prevent slippage between the disk and the turntable without increasing the magnetic field strength of the magnetic material disposed on the turntable and the chucking boot. It is possible to generate a strong chucking force.

[Brief explanation of drawings]

1, 2, 3, and 4 are views showing embodiments of the present invention, with FIG. 1 being a perspective view of the main part, and FIG.
4 are diagrams showing the magnetized states of the turntable and the chucking pulley, respectively. 6...Turntable, 7...Chucking pulley. Figure 1

Claims (2)

[Claims] (1) A disk chucking device that chucks a disk using magnetic force, characterized in that both the turntable and the chuck pulley are multi-pole magnetized. (2) Claim 1 characterized in that the magnetic poles are multipole magnetized in the rotational direction of the turntable and the chuck pulley.
The disc chucking device described in .