Dynamic optical information storage or retrieval – Dynamic mechanism optical subsystem – Optical storage medium support
Reexamination Certificate
2002-10-17
2004-12-07
Ometz, David L. (Department: 2653)
Dynamic optical information storage or retrieval
Dynamic mechanism optical subsystem
Optical storage medium support
Reexamination Certificate
active
06829777
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a turntable for mounting a disk-like information recording medium thereon to rotate it continuously, and an optical disk using the turntable.
BACKGROUND ART
A turntable has been heretofore used in order to rotate and drive a disk-like recording medium, for example, an optical disk such as a compact disk (CD), or a Digital Versatile Disk (DVD).
As a turntable for mounting an optical disk thereon to rotate and drive it, the turntable constituted as shown in
FIG. 1
is used. In the turntable
1000
, an optical disk D is fitted in a centering portion
1002
formed with a centre hole
1001
in a centre portion of the turntable
1000
whereby the optical disk D is mounted on the turntable
1000
. The centering portion
1002
is formed into a convergent trapezoid, and is formed, in the circumferential surface, with an elastic displacing element
1004
elastically displaced in a diametrical direction and a fixed element
1003
alternately there around. The inner peripheral surface of the centre hole
1001
is pressed and supported by the elastic displacing element
1004
and placed in contact with the fixed element
1003
to coincide the rotational centre with a rotational centre CL of the turntable
1000
, and the optical disk D is mounted on the turntable
1000
.
A magnet
1005
is provided on the centering portion
1002
of the turntable
1000
. The magnet
1005
magnetically attracts a chucking portion not shown to hold the optical disk D in cooperation with the turntable
1000
. A yoke
1006
is provided on the lower side of the magnet
1005
. The centering portion
1002
is secured to the turntable
1000
by pressing, and the turntable
1000
is mounted on a drive shaft
1008
of a spindle motor
1007
by pressing. The elastic displacing element
1004
for carrying out the centering operation of the optical disk D provided and mounted on the centering portion
1002
is formed of a creepless material such as PEI (poly ether imido) which is hard to produce the creeping phenomenon in order to prevent the creeping phenomenon from occurring in the state that the optical disk D is mounted not to return to the original state.
The turntable
1000
heretofore used has the construction in which the centering portion
1002
is pressed into the centre portion and pressed into the drive shaft
1008
to mount it. That is, since the centering portion
1002
and the turntable
1000
are formed from a separate member, not only assembling is difficult but also mounting aimed at centering for allowing the centre of the centering portion
1000
to coincide with the centre of the drive shaft
1008
is difficult.
There is a further problem that since the a creepless material such as PEI (poly ether imido) is high in molding temperature, injection molding of the centering portion
1002
cannot be carried out in the state that the magnet
1005
is put into a molding mold. When the magnet
1005
is exposed to the high temperature atmosphere, demagnetization occurs, and therefore, the centering portion
1002
cannot be molded with the magnet
1005
inserted. Therefore, the magnet
1005
is fixed by adhesion after the centering portion
1002
has been molded. Since such a magnet
1005
is adhered, the assembling step of the centering portion
1002
becomes complex, leading to the higher cost, and further posing a problem also in reliability in term of assembly.
Further, when the optical disk is mounted on the turntable and rotated continuously, it is also necessary to prevent the optical disk from slipping with respect to the turntable. That is, the optical disk need be rotated and driven integral with the turntable.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a novel turntable and an optical disk device using the turntable, which solves the technical problem noted above with respect to the conventional turntable.
It is a further object of the present invention to provide a turntable and an optical disk device using the turntable in which when a disk-like information recording medium is mounted, correction of eccentricity of the information recording medium can be carried out positively by a simple constitution.
It is another object of the present invention to provide a turntable and an optical disk device using the turntable capable of mounting a disk-like information recording medium so as to be rotated and driven positively integrally while suppressing occurrence of eccentricity when the disk-like information recording medium is mounted.
In the turntable according to the present invention, a fixed portion is fitted into a centre hole of a disk-like information recording medium. A movable portion corrects eccentricity when the disk-like information recording medium is mounted. A return assisting member has a function in which when the disk-like information recording medium is not mounted, the movable portion is returned from a position when the disk-like information recording medium is mounted to a position when the disk-like information recording medium is not mounted. By the provision of this constitution, when the disk-like information recording medium is mounted, the movable portion is able to correct eccentricity of the disk-like information recording medium. Moreover, the return assisting member is able to return the movable portion from a position when the disk-like information recording medium is mounted to a position when the disk-like information recording medium is not mounted. From this, the movable portion is able to correct eccentricity positively when the disk-like information recording medium is mounted.
By the provision of the return assisting member, a portion including the movable portion need not to use quality of a creepless material for preventing the creeping phenomenon unlike prior art, but is able to use synthetic resin having been used widely heretofore as a material for constituting a turntable. From this, since a special quality like a creeping material is not used, the cost can be reduced. Moreover, since the return assisting member is secured to the shaft portion, a special portion is not necessary for securing the return assisting member, and the return assisting member can be secured to the shaft portion directly, for example, by pressing or adhesion. From this, the construction is simple, and the cost can be reduced.
In the turntable according to the present invention, the movable portion has elastic displaceable elements, a plurality of which are arranged at equal angles about a rotational centre shaft. Since the plurality of elastic displaceable elements are arranged at equal angles about a rotational centre shaft, it is possible to correct eccentricity of the disk-like information recording medium mounted on the centering portion positively at any position.
Further, the turntable according to the present invention has a member for chucking the disk-like information recording medium, and a magnet for attracting the chucking member magnetically, the disk-like information recording medium being held detachably between the magnet and the chucking member. The magnet provided on the turntable attracts the chucking member to hold the disk-like information recording medium detachably.
Further, a turntable for mounting a disk-like information recording medium to continuously rotate it according to the present invention comprises a fixed portion having a hole for fitting a shaft of a motor for continuously rotating the turntable and fitted in a centre hole of the disk-like information recording medium, a movable portion fitted in an inner peripheral edge with the fixed portion as s reference to be elastically deformed to correct eccentricity when the disk-like information recording medium is mounted, and a return assisting member in which when the disk-like information recording medium is not mounted, the movable portion is returned from a position when the disk-like information recording medium is mounted to a position when the disk-like information recording medium is not mounted.
In the tu
Kananen Ronald P.
Ometz David L.
Sony Corporation
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