Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Reexamination Certificate
2000-03-29
2003-09-02
Davis, David (Department: 2652)
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
C369S271100
Reexamination Certificate
active
06614748
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a disk drive for rotating a discoid recording medium such as an optical disk or optical magnetic disk and recording (writing) and/or reproducing (reading) an information signal by moving a pickup along the information recording plane of the discoid recording medium and to a turntable to be preferably used for the disk drive.
2. Description of the Prior Art
A disk drive has been generally produced so far which records and/or reproduces an information signal by using a discoid recording medium such as an optical disk {CD (Compact Disk) or CD-ROM (Read Only Memory)} or an optical magnetic disk (OD). The disk drive rotates an optical disk by horizontally setting the optical disk serving as a discoid recording medium onto a turntable set to the rotating shaft of a spindle motor and applies a laser beam to the information recording plane of the optical disk by an optical head of an optical pickup serving as a pickup. The optical head is moved from the center of the optical disk outward in radial direction so as to write an information signal in the information recording plane or read an information signal previously recorded in the information recording plane.
In the case of this type of the disk drive, it is necessary that the information-recording plane of an optical disk in which an information signal is recorded and an optical head of an optical pickup are set to a predetermined tilt angle or less. This is because the accuracy of reproduction of an information signal greatly depends on the tilt angle of the optical head. In this case, to execute high-density, high-accuracy recording and/or reproducing of an optical disk, it is preferable to set the optical axis of the objective of an optical head vertically (90°) to the information recording plane of the optical disk. However, because the tilt of an optical disk, verticality of a spindle motor, and verticality of an objective fluctuate, it is difficult to set the optical axis of the objective accurately vertically to the information recording plane of the optical disk.
Therefore, in the case of a disk drive using an optical disk such as a CD or CD-ROM and an information recording medium, the allowable range of a relative tilt between an optical disk and an objective is standardized to 1.20 or less (a tilt angle of an optical disk is standardized to 0.60 or less and a tilt angle of a spindle motor or objective is standardized to 0.60 or less). Moreover, the optical axis of an objective is adjusted in a range between predetermined tilts by tilting an optical pickup on the basis of a state in which an optical disk is set to a predetermined position.
A disk drive shown in
FIG. 20
is known as the disk drive having the above disk tilt mechanism. The disk drive
1
is provided with a spindle chassis
2
constituted of a flat frame on whose inside an almost-quadrangular opening is formed and a pickup chassis
3
constituted of a flat frame on which an opening slightly smaller than the opening of the spindle chassis
2
is formed. A pair of shaft portions
3
a
protruding to the both sides of the pickup chassis
3
in the width direction is provided for the pickup chassis
3
and moreover, a pair of bearing portions
2
a
for rotatably supporting the shaft portions
3
a
is provided for the spindle chassis
2
. By combining these pairs of bearing portions
2
a
and shaft portions
3
a
, the pickup chassis
3
is supported so as to be swingable in the longitudinal direction of the spindle chassis
2
.
A tilt driving mechanism
4
is provided for one side of the spindle chassis
2
in its longitudinal direction and the pickup chassis
3
is oscillated in the longitudinal direction of the spindle chassis
2
in accordance with the operation of the tilt driving mechanism
4
. A spindle motor
5
is fixed to the other side of the spindle chassis
2
in its longitudinal direction while turning the rotating shaft of the motor
5
upward. A turntable
6
to which an optical disk is set is integrally set to the rotating shaft of the spindle motor
5
.
The turntable
6
has the configuration shown in
FIGS. 21A and 21B
. That is, the turntable
6
is provided with a table
101
, a center cap
102
, a movable ring
103
, a compression coil spring
104
, a yoke plate
105
, and a magnet
106
. The table
101
has an annular mounting portion
101
a
on which an optical disk
110
is mounted, a recessed portion
101
b
constituted of an annular recess provided inside of the mounting portion
101
a
, and a cylindrical boss portion
101
c
provided for the central portion of the recessed portion
101
b
. The center cap
102
is fitted to and integrally set to the boss portion
101
c
of the table
101
.
The center cap
102
is constituted of an annular member whose outside diameter is properly smaller than the diameter of the recessed portion
101
b
, its thickness is set to a value properly larger than the depth of the recessed portion
101
b
, and its front end is protruded from the recessed portion
101
b
. An annular concave portion
102
a
is formed at the front end of the center cap
102
and the yoke plate
105
and magnet
106
are stored in the concave portion
102
a
. The movable ring
103
is rotatably fitted to the outer periphery of the center cap
102
so as to be movable in the axial direction.
The movable ring
103
has a sleeved ring
103
a
, an annular end face
103
b
provided for one side of the ring
103
a
, and a tapered slope
103
c
continuously provided for the outside of the end face
103
b
in its radius direction. One end of the compression coil spring
104
is set on the inner face of the end face
103
b
of the movable ring
103
. The other end of the compression coil spring
104
is set to the bottom face of the recessed portion
101
b
and the movable ring
103
is always pressed against the front end of the center cap
102
by the spring force of the compression coil spring
104
. The movable ring
103
is prevented from being removed by preventing movement of the movable ring
103
by an outward flange portion
102
b
provided for the front end of the center cap
102
. A fitting portion to be fitted to a center hole
110
a
of the optical disk
110
is constituted of the slope portion
103
c
of the movable ring
103
and the flange portion
102
b
of the center cap
102
.
The turntable
6
having the above configuration is set to the state shown in
FIG. 21A
before the optical disk
110
is mounted and the movable ring
103
energized by the spring force of the compression coil spring
104
contacts with the flange portion
102
b
of the center cap
102
. By setting the optical disk
110
to the turntable
6
from the above state and fitting to the center hole
110
a,
the above stage is changed to the state shown in FIG.
21
B and the movable ring
103
is lowered. As a result, the margin of the center hole
110
a
of the optical disk
110
contacts with the slope portion
103
c
of the movable ring
103
and the optical disk
110
is centered by the slope portion
103
c.
Moreover, as shown in
FIG. 20
, a guide shaft
3
b
and a guide portion (not appearing in
FIG. 20
) are set to the pickup chassis
3
so as to extend in the longitudinal direction by keeping a predetermined interval from each other in parallel. A slide member
8
of an optical pickup
7
is slidably supported by the guide shaft
3
b
and the guide portion. Moreover, a not-illustrated rack is fixed to the slide member
8
and a gear located at the end of a head feed mechanism
9
is engaged with the rack. By driving the head feed mechanism
9
and transmitting the torque to the slide member
8
, the optical pickup
7
is moved so as to approach to or go away from the turntable
6
.
Moreover, a skew sensor
10
for detecting the distance from the information recording plane of an optical disk mounted on the turntable
6
is mounted on the slide member
8
. The skew sensor
10
emits light toward the information-recording plane and detects a warpage o
Morishita Tomoaki
Shiomi Tetsuhiro
Davis David
Frommer William S.
Frommer & Lawrence & Haug LLP
Ryan Matthew K.
Sony Corporation
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