Optical disk player

Details Optical disk player Optical disk player

1991-02-26

1992-07-14

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 4441, G11B 700

Patent

active

051309637

ABSTRACT:
An optical disk player using quadrant type photodetector as light receiving means. The phase difference output by the time difference detection method is issued as a tracking error, and a DC component of differential output by the push-pull method is issued as a tilt error, and zero cross of said differential output is detected. By using this detection output for the detection of zero-cross timing on off-track, stable operation of the tracking servo unit is ensured.

REFERENCES:
patent: 4476555 (1984-10-01), Joichi et al.
patent: 4589103 (1986-05-01), Tajima
patent: 4707648 (1987-11-01), Minami
patent: 4775906 (1988-10-01), Miura et al.
patent: 4803675 (1989-02-01), Komatsu
patent: 4817069 (1989-03-01), Shigemori

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