Optical disk apparatus for detecting error readings of a track a

Details Optical disk apparatus for detecting error readings of a track a Optical disk apparatus for detecting error readings of a track a

1994-07-06

1996-02-27

Epps, Georgia Y.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 58, G11B 1722

Patent

active

054954584

ABSTRACT:
A recovery is promptly executed for a reading error of a track address in a modified constant angular velocity format. Upon seeking, when a defective reading operation of the track address occurs, a clock frequency of the zone corresponding to each detecting position is selected due to the detection of the head by a head position sensor or the movement of the head to a home position at which a detection signal of a home position sensor is obtained, and the reading operation is retried. Errors due to back talk noises upon reproduction are reduced. At the time of retry for the occurrence of errors due to the back talk noises, a modulation amount of a read beam from a laser diode is changed.

REFERENCES:
patent: 4873679 (1989-10-01), Murai et al.
patent: 5138599 (1992-08-01), Fukushima et al.
patent: 5182741 (1993-01-01), Maeda et al.
patent: 5245595 (1993-09-01), Yasukawa
patent: 5278814 (1994-01-01), Deguchi et al.
patent: 5315568 (1994-05-01), Dente et al.

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