Disk clamping apparatus for disk player

Details Disk clamping apparatus for disk player Disk clamping apparatus for disk player

2002-10-04

2004-11-30

Ometz, David L. (Department: 2653)

Dynamic optical information storage or retrieval

Dynamic mechanism optical subsystem

Optical storage medium support

Reexamination Certificate

active

06826772

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Korean Patent Application No. 2001-78670 filed on Dec. 12, 2001, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a disk clamping apparatus for a disk player.
2. Description of the Related Art
Generally, a disk player is an apparatus which records/reproduces information on/from a recording medium such as a CD, a CD-ROM, or a DVD.
FIG. 1
shows a conventional disk player having a deck base
40
which includes a hinge connected to a housing (not shown) so as to have the deck base
40
rotate in a vertical plane, a deck plate
20
under which predetermined clampers
30
are interposed to be connected to the deck base
40
, a spindle motor
21
which is mounted in the deck plate
20
and provides a rotating force to a disk
1
, a turntable
23
which is connected to a rotating axis
22
of the spindle motor
21
and on which the disk
1
is placed, a disk clamper
10
which is mounted in an upper portion of the housing so as to be opposite to the turntable
23
and clamps the disk
1
on the turntable
23
, and an optical pickup
25
which is mounted to be transferred to the deck plate
20
in a direction of a radius of the disk
1
and performs a recording/reproducing operation.
FIG. 2
shows a partial cross-sectional view of the disk player shown in FIG.
1
. The disk
1
, which is placed on the turntable
23
, is clamped between the turntable
23
and the disk clamper
10
, and is rotated with the turntable
23
and the disk camper
10
as the spindle motor
21
rotates. During the rotation of the disk
1
, the optical pickup
25
performs a recording/reproducing operation on a recording surface of the disk
1
. A magnet
23
a
and a back yoke
23
b
are mounted in the turntable
23
, and yokes
10
a
are mounted in the disk clamper
10
. The disk
1
is clamped by a combination of magnetic forces of the yokes
10
a.
The above disk clamping structure is based on a premise that a disk to be clamped has a uniform thickness of 1.2 mm. That is, since most disks used in a disk player have a thickness of 1.2 mm, the magnet
23
a
and the yokes
23
b
and
10
a
of the turntable
23
and the disk clamper
10
are designed to clamp the disks having the thickness of 1.2 mm.
Recently, however, with production of disks having high density and disk players having smaller and thinner dimensions, various changes in a disk thickness are expected and modified disks with different thicknesses have been already produced. Where a thickness of a disk is changed, it is difficult for the conventional clamping structure to accommodate the disk because a distance between the magnet
23
a
and the yoke
10
a
, which provide a clamping force, is changed. Accordingly, if the disk is thicker than 1.2 mm, the clamping force decreases, and the disk may be separated from the clamping structure of the disk player. On the other hand, if the disk is thinner than 1.2 mm, the clamping force increases, and the disk may not be smoothly released from the clamping structure of the disk player. Therefore, in the conventional clamping structure, it is very difficult to set an appropriate clamping force to cover a broad range of a thickness variation available among the disks.
Thus, there is a need for a disk clamping apparatus having a structure which reduces a variation in a clamping force caused by disks having a thickness variation, that is, different thicknesses.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a disk clamping apparatus for a disk player, which suppresses a variation in a clamping force caused by a variation in thickness of disks.
Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
To achieve the above and other objects of the present invention, there is provided a disk clamping apparatus for a disk player, comprising a turntable for receiving a disk thereon, a disk clamper which clamps the disk placed on the turntable, and first and second magnetic bodies which are mounted in the turntable and the disk clamper, respectively, and provide a clamping force to the disk by acting a reciprocal magnetic force on the turntable and the disk clamper. The first and second magnetic bodies are positioned opposite to and partially overlap each other.


REFERENCES:
patent: 4951277 (1990-08-01), Masunaga et al.
patent: 6570836 (2003-05-01), Yabushita
patent: 8-221860 (1996-08-01), None
patent: 11-66670 (1999-03-01), None

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