Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1988-06-21
1991-12-17
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4425, 369 4428, 369 4432, 369 54, G11B 7085
Patent
active
050738810
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 large number of dropouts, the velocity servo loop is closed during the existence of such dropouts to keep the optical servo loop from receiving a disturbance signal generated due to the dropout, thereby ensuring stable reproduction of signals from the disc.
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Envall Jr. Roy N.
Matsushita Electric - Industrial Co., Ltd.
Young W. R.
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