Optical disc apparatus with rapid and stable accessing capabilit

Details Optical disc apparatus with rapid and stable accessing capabilit Optical disc apparatus with rapid and stable accessing capabilit

1991-01-30

1992-05-26

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 4432, 369 54, G11B 7085

Patent

active

051174103

ABSTRACT:
An optical disc apparatus comprising an optical servo loop and a velocity servo loop to control the velocity of a pickup to zero, wherein the two servo loops are selectively switched in accordance with the set mode of disc playing or the state of such playing. When a fast access is executed, the pickup is controlled by the velocity servo loop to avert undesired vibration in the travel of the pickup and also to protect the optical servo from any shock that may otherwise be caused by the travel and halt of the pickup. And in playing of any disc having a great amount of dropouts, the velocity servo loop is closed during the existence of such dropouts to keep the optical servo loop from the disturbance signal generated due to the dropout, thereby ensuring stable reproduction of signals from the disc.

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patent: 4785439 (1988-11-01), Okada et al.
patent: 4837757 (1989-06-01), Okada et al.
patent: 4855982 (1989-08-01), Orlicki et al.

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