Magnetooptical disk focus and tracking servo for a magnetooptica

Details Magnetooptical disk focus and tracking servo for a magnetooptica Magnetooptical disk focus and tracking servo for a magnetooptica

1997-01-30

1999-04-13

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, G11B 7095

Patent

active

058944621

ABSTRACT:
A magnetooptical disk focus servo and tracking servo which remain stable and which make various servo control gains uniform even when the amount of light detected in a photodetecting portion changes. An operator outputs a sum signal by adding signals corresponding to an amount of light detected in at least two photodiodes among a plurality of photodiodes of the photodetecting portion. A first divider divides a focus error signal by the sum signal. A second divider divides a tracking error signal by the sum signal. A focus servo portion controls a focus actuator using the output of the first divider, and a tracking servo portion for controlling a track actuator with the output of the second divider.

REFERENCES:
patent: 4977551 (1990-12-01), Minami et al.
patent: 5004901 (1991-04-01), Yoshimoto et al.
patent: 5097458 (1992-03-01), Suzuki
patent: 5109367 (1992-04-01), Yoshikawa
patent: 5343454 (1994-08-01), Watanabe et al.
patent: 5517474 (1996-05-01), Takamine
patent: 5559770 (1996-09-01), Hiroki et al.
Patent Abstracts of Japan vol. 17, No. 536 (P-1620), Sep. 27, 1993, & JP 05 144024 A (Konica Corp.), Jun. 11, 1993, *Abstract.
Patent Abstracts of Japan vol. 17, No. 408 (P-1582), Jul. 29, 1993 & JP 05 073982 A (Sharp Corp.), Mar. 26, 1993, *Abstract.

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