Method for correcting aberration due to optical disk tilt and ap

Details Method for correcting aberration due to optical disk tilt and ap Method for correcting aberration due to optical disk tilt and ap

1995-12-26

1997-12-16

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369 4423, 369 4432, 369 58, G11B 7095

Patent

active

056993404

ABSTRACT:
In a method and an apparatus for correcting aberration due to optical disk tilt, the apparatus includes a correction plate through which a first light beam passes by an object lens in an optical disk, a light source and a photo detector for generating and receiving a second light beam to detect the magnitude of the optical disk tilt, respectively, and an actuator for inclining the correction plate based on the detected signal. The correction plate has the same optical properties as those of the substrate of the optical disk, irrespective of the optical pick surroundings and offset the aberration due to the optical disk tilt. Therefore, while the best performance of the optical pickup is ensured, adverse effects caused by the aberration due to the optical disk tilt can be eliminated through simple circuitry.

REFERENCES:
patent: 4780865 (1988-10-01), Yamakawa
patent: 5216649 (1993-06-01), Koike et al.
patent: 5302834 (1994-04-01), Murao
patent: 5357102 (1994-10-01), Ishika
patent: 5430699 (1995-07-01), Matsubara et al.
patent: 5515348 (1996-05-01), Ohsato
patent: 5523989 (1996-06-01), Ishibashi
patent: 5546367 (1996-08-01), Yoshimura et al.
Naoya Eguchi et al., "Fast Disk Skew Servo for Optical Disk Pickup," Technical Digest, SOM'94, Symposium on Optical Memory 1994, Jul. 11-13, 1994, Tokyo, Japan.

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