Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1982-01-07
1984-01-17
Konick, Bernard
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
250201, G11B 700
Patent
active
044266901
ABSTRACT:
An optical reproducing device for reproducing information from a rotating record medium includes a focus control system for displacing a focusing lens perpendicular to the plane of the record medium. A light beam is conducted through the focusing lens on to the record medium. A capture range search system is provided to move the focusing lens at a substantially constant speed from a rest position until it is positioned within the capture range of the focusing control system. The capture range search system includes a bridge circuit for sensing the moving speed of the focusing lens. The bridge circuit includes a moving coil of a drive motor for said focusing lens and a variable impedance element. The bridge circuit is balanced by controlling the variable impedance element when the lens is at the rest position.
REFERENCES:
patent: 3974327 (1976-08-01), Van Dijk
patent: 3976828 (1976-08-01), Janssen
patent: 4128847 (1978-12-01), Roullet et al.
patent: 4286147 (1981-08-01), Tsuboi et al.
patent: 4337532 (1982-06-01), Oprandi et al.
patent: 4338682 (1982-07-01), Hosaka et al.
Eslinger Lewis H.
Konick Bernard
McElheny Jr. Donald
Sinderbrand Alvin
Sony Corporation
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