Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1986-04-07
1988-05-17
Stephan, Steven L.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
360 77, 369 44, G11B 1700, G11B 700, G11B 2110
Patent
active
047455888
ABSTRACT:
An apparatus for controlling the tracking of an optical disk by moving an objective lens and a carriage supporting the objective lens. The apparatus comprises a lens tracking mechanism comprising an actuator and a lens tracking circuit, and an equivalent circuit having the same response characteristic as the lens tracking mechanism. The lens tracking mechanism moves the lens in real time in the radial direction of the disk in accordance with a tracking error signal representing the distance between a laser beam spot and a target track. The carriage is moved also in the radial direction of the disk in accordance with a sine-wave signal approximating the eccentricity of the disk. The eccentricity has been detected from the distance over which the lens is moved when the carriage is not moved. This distance is not detected by measuring, but obtained from the output signal which the equivalent circuit generates in response to the tracking error signal.
REFERENCES:
patent: 4488276 (1984-12-01), Tanaka
patent: 4497048 (1985-01-01), Konura
patent: 4544872 (1985-10-01), Hirano et al.
patent: 4581728 (1986-04-01), Nakamura et al.
patent: 4630250 (1986-12-01), Nonomura
patent: 4630252 (1986-12-01), Miura et al.
Doi Masanori
Yoshikawa Shozi
Olympus Optical Co,. Ltd.
Stephan Steven L.
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