JPH0356905Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention uses the attraction force between the magnet attached to the clamper and the ring to sandwich the outer periphery of the disk between the clamper and the ring. This invention relates to a disk clamp device for a disk player, which fixes the outer periphery of the disk to reduce the burden on the focus servo of the pickup and the effect on sound quality.

[Conventional technology]

There is a disk clamping device for a disk player as shown in FIG. In other words, the disk 2 placed on the turntable 1,
It is fixed to the turntable 1 by a clamper 3. The clamper 3 may be fixed by an external force such as applying a force from the outside with a spring or the like, or by attaching a magnet to the clamper 3 and using the attraction force between the turntable 1 and the clamper 3.

[Problem that the invention attempts to solve]

The size of the clamper 3 that holds the disc 2 between the turntable 1 and the turntable 1 is set within the range of the inner peripheral portion of the disc 2 where there is no signal. This is because it is large enough to fix the disk 2. Therefore, the inner circumferential portion of the disk 2 is fixed, but the outer circumferential portion of the disk 2 is not fixed. Therefore, the outer circumferential portion of the disk 2 becomes free, and the surface runout due to warping or distortion of the disk 2 is not restricted. Therefore, the amount of displacement in the focus direction becomes large, and the control amount for the focus servo of the pick-up becomes large. The problem is that it imposes a burden. Further, there is a problem in that the minute vibrations of the disk 2 are not regulated and left unattended, which has a subtle effect on the sound quality.

This invention was made for the purpose of solving such problems.

[Means for solving problems]

Means for solving the above problems will be explained below using FIG. 1 corresponding to the embodiment. This invention is based on a clamper 1 having a magnet 11A on the outer periphery.
1 and a ring 12 that is attracted to the magnet 11A.
The outer periphery of the disk 2 is sandwiched between the clamper 11 and the ring 12 by the attraction force between the magnet 11A and the ring 12.

[Effect]

The outer periphery of the disk 2 includes the clamper 11 and the ring 1.
It is fixed with 2.

〔Example〕

FIG. 1 is a diagram showing an embodiment of this invention.
In FIG. 1, 1 is a turntable, 2 is a disk, 11 is a clamper, and 12 is a ring. The clamper 11 is made of plastic and has a circular shape, and its diameter is larger than the diameter of the disk 2. A ring-shaped groove 11B whose inner diameter is larger than the diameter of the disk 2 is formed on the outer circumference of the lower surface of the clamper 11. A magnet 11A having a thickness greater than the depth of the groove 11B is bonded to the groove 11B. The magnet 11A may be one ring-shaped magnet or may be a plurality of arc-shaped magnets. magnet 1
The thickness of the 1A clamper 11 protruding from the lower surface is smaller than the thickness of the disk 2.

The outer diameter of the ring 12 is larger than the diameter of the clamper 11, and the inner diameter of the ring 12 is smaller than the diameter of the disk 2. Then, when the ring 12 is attracted to the magnet 11A, the ring 12 comes into contact with the outer peripheral portion of the disk 2 where there is no signal. A guide ring 12A having a triangular cross section and tilting obliquely from the inside to the outside is provided on the upper surface of the ring 12 at a position corresponding to the outside of the magnet 11A. ring 12
Even if the guide ring 12A is slightly misaligned, the guide ring 12A will slide on the outside of the magnet 11A and the ring 12
The position of is corrected. The ring 12 is supported by a ring support piece 13 and is prevented from moving upward by a ring separation piece 14. The ring support piece 13 may be one ring-shaped piece, or may be a plurality of arc-shaped pieces. Ring separation piece 14
The ring support piece 13 is formed integrally with a plurality of pieces each having an inverted L-shaped cross section and an arcuate planar shape. The height of the vertical piece of the ring separation piece 14 is determined so that the ring 12 does not come into contact with the horizontal piece of the ring separation piece 14 when the ring 12 is attracted to the magnet 11A. The ring support piece 13 and the ring separation piece 14 are made of plastic. The ring separation piece 14 is pushed outward and the ring 12 is placed on the ring support piece 13.

The disk 2 is placed on the turntable 1 with the ring 12 being supported by the ring support piece 13. The clamper 11 is guided by a magnet 11A located outside the disk 2 and protruding below the lower surface of the clamper 11, and the lower surface of the clamper 11 comes into contact with the upper surface of the disk 2. Due to this contact, the magnet 11
A and the ring 12 approach each other, and due to the suction force acting between them, the ring 12 moves upward and the disk 2
Press the outer periphery of the Due to this pressure contact, the outer peripheral portion of the disk 2 is sandwiched between the clamper 11 and the ring 12 and fixed.

When removing disk 2 from turntable 1,
Lift up the clamper 11, but at this time ring 1
Lift up 2 as well. However, the ring 12 comes into contact with the horizontal piece of the ring separation piece 14 and is separated from the disk 2.

By fixing the outer circumferential portion of the disk 2, surface runout and minute vibrations due to warping or distortion of the disk 2 are controlled, and the burden on the focus servo of the pickup and the influence on the sound quality are reduced.

Although not shown in the drawings, the disk 2 can be fixed to the turntable 1 either by applying force to the clamper 11 from the outside using a spring or the like, or by attaching a magnet to the clamper 11 and fixing it to the turntable 1. This may be due to the suction power of

[Effect of idea]

As explained above, this invention includes a clamper having a magnet on its outer periphery, and a ring that is attracted to the magnet, and the attraction between the magnet and the ring causes the outer periphery of the disk to be moved between the clamper and the ring. It is held in place by a ring. Therefore, the outer periphery of the disk is fixed, and surface runout and minute vibrations due to warpage, distortion, etc. of the disk are restricted. Therefore, according to this invention, it is possible to reduce the burden on the focus servo of the pickup and the effect on the sound quality.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of this invention.
FIG. 2A is a diagram showing a state before clamping, FIG. 2B is a diagram showing a state after clamping, and FIG. 2 is a sectional view showing a conventional technique. 1... Turntable, 2... Disc, 11
...Clamper, 11A...Magnet, 12...
ring.

Claims (1)

[Scope of utility model registration request] A disk clamp device for a disk player, comprising a clamper having a magnet on the outer periphery, and a ring attracted by the magnet, and sandwiching the outer periphery of the disk between the clamper and the ring by the attraction force between the magnet and the ring.