Disk recording and reproducing apparatus
First Claim
1. A disk recording and reproducing apparatus comprising:
- a motor;
a rotary body driven by the motor to undergo rotation;
a table supported by the rotary body to undergo rotation therewith;
magnetic bearing means for supporting the rotary body and adjusting a relative position of the rotary body;
a pickup for irradiating with a laser beam a recording surface of a disk mounted on the table arranged on the rotary body and receiving the laser beam reflected by the recording surface;
detection means for calculating a relative positional relationship between the disk and a focal position of the laser beam based on a signal output by the pickup; and
control means for adjusting the position of the rotary body by controlling the magnetic bearing means in accordance with an output of the detection means.
1 Assignment
0 Petitions
Accused Products
Abstract
Conventional disk recording and reproducing apparatuses have addressed a shortcoming that they cannot correct squareness errors and misalignments caused by the warpage of a disk and the eccentricity of the center hole of the disk and of the center of curvature of signal tracks. To overcome this shortcoming, a disk recording and reproducing apparatus of the present invention comprises: magnetic bearing means capable of supporting a rotary body and adjusting a relative position of the rotary body; a pickup for irradiating, with a laser beam, a recording surface of a disk mounted on a table arranged on the rotary body and receiving the laser beam reflected by the recording surface; detection means for calculating a relative positional relationship between the disk and a focal position of the laser beam based on a signal from the pickup; and control means for adjusting the position of the rotary body by controlling the magnetic bearing means.
20 Citations
17 Claims
-
1. A disk recording and reproducing apparatus comprising:
- a motor;
a rotary body driven by the motor to undergo rotation;
a table supported by the rotary body to undergo rotation therewith;
magnetic bearing means for supporting the rotary body and adjusting a relative position of the rotary body;
a pickup for irradiating with a laser beam a recording surface of a disk mounted on the table arranged on the rotary body and receiving the laser beam reflected by the recording surface;
detection means for calculating a relative positional relationship between the disk and a focal position of the laser beam based on a signal output by the pickup; and
control means for adjusting the position of the rotary body by controlling the magnetic bearing means in accordance with an output of the detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a motor;
-
9. A disk playing apparatus comprising:
- a motor;
a rotary member driven by the motor to undergo rotation;
a disk support member fixed to the rotary member to undergo rotation therewith;
a magnetic bearing for supporting the rotary member and adjusting a relative position thereof in at least one of an axial and a radial direction thereof;
a reading device for reading data from a disk mounted on the disk support member; and
a circuit for supplying a control signal to the magnetic bearing to maintain the rotary member at a desired orientation with respect to the reading device. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
- a motor;
Specification