Optical information recording and/or reproducing apparatus

Details Optical information recording and/or reproducing apparatus Optical information recording and/or reproducing apparatus

1986-03-11

1988-09-06

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369112, 350 63, 350245, G11B 7135

Patent

active

047698039

ABSTRACT:
In order to detect the position of a lens holder held resiliently by a pair of plate springs and fitted with an objective lens, a sensor is fitted in a through hole made in at least one of a pair of permanent magnets enclosing this lens holder and forming a closed magnetic circuit and the position holding the objective lens in a predetermined position is controlled with the output of the above mentioned sensor at the time of starting and ending the movement of the pickup.

REFERENCES:
patent: 4135083 (1979-01-01), Van Alem et al.
patent: 4419614 (1983-12-01), Kimura
patent: 4449213 (1984-05-01), Noborimoto et al.
patent: 4473274 (1984-09-01), Yano et al.
patent: 4479051 (1984-10-01), Musha

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