Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1991-10-03
1992-08-11
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, 369 54, G11B 709
Patent
active
051385937
ABSTRACT:
A device for driving an actuator for tracking-controlling, focus-controlling or otherwise controlling an optical pickup in an optical type recording and/or reproducing device such as a CD (Compact Disc) player, a CD-V (Compact Disc with video) player and an LV (laser vision) player comprises an actuator driving coil for moving an actuator of an optical pickup, a sensor for detecting movement of the actuator, a first servo loop for feeding back detection output of a reflected beam from a recording medium, and a second servo loop for feeding back a detection output of the sensor to the actuator driving coil. The second servo loop functions to restrain an arbitrary movement of the actuator which is not following a command by the first servo loop whereby unnecessary vibration due to transient response is reduced and the actuator becomes easier to handle.
REFERENCES:
patent: 4698795 (1987-10-01), Yoshio
patent: 4769803 (1988-09-01), Yamamiya
patent: 4773055 (1988-09-01), Gijzen et al.
patent: 4855982 (1989-08-01), Orlicki et al.
Envall Jr. Roy N.
Yamaha Corporation
Young W. R.
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