Focussing lens servo driving device for optical information read

Details Focussing lens servo driving device for optical information read Focussing lens servo driving device for optical information read

1979-09-07

1981-07-21

Moffitt, James W.

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

042802156

ABSTRACT:
A focussing lens servo driving device for an optical information reading device in which the lens is first driven towards the focussed position with a controlling servo circuit operated in an open loop mode. Once the lens has passed a predetermined position an opposition force is produced in dependance on the lens position. The opposition force is gradually reduced and the servo loop is closed when the lens has been turned back to the predetermined position so that stable operation is provided.

REFERENCES:
patent: 3974327 (1976-08-01), Van Dijk
patent: 4051527 (1977-09-01), Braat
patent: 4128847 (1978-12-01), Roullet et al.

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