Optical scanning apparatus with focussing system

Details Optical scanning apparatus with focussing system Optical scanning apparatus with focussing system

1979-10-17

1982-11-02

Faber, Alan

Dynamic information storage or retrieval

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

Mechanism control by the control signal

250201, G11B 712

Patent

active

043576966

ABSTRACT:
Disclosed in an apparatus for optically scanning a record carrier in which the scanning beam is focussed on the record carrier by a focussing system. For automatically correcting an incorrect control point of the focussing system, the apparatus is provided with a phase detector to which are applied the focussing error signal generated by the focussing system and a signal corresponding to the amplitude of the information signal being read. The output signal supplied by the phase detector is applied to the focussing system a correction signal so as to automatically correct for an incorrect control point of the focussing system.

REFERENCES:
patent: 3833769 (1974-09-01), Compoon
patent: 3873763 (1975-03-01), Jonssen
patent: 3876841 (1975-04-01), Krones
patent: 3876842 (1975-04-01), Bouwhius
patent: 3952191 (1976-04-01), Tinet
patent: 3969576 (1976-07-01), Boonstra
patent: 3992574 (1976-11-01), Bouwhius
patent: 3992575 (1976-11-01), Velzel
patent: 4006293 (1977-02-01), Bouwhius
patent: 4011400 (1977-03-01), Simons
patent: 4051527 (1977-09-01), Broat
patent: 4057833 (1977-11-01), Broat
patent: 4135207 (1979-01-01), Greve
patent: 4163149 (1974-07-01), Sawano

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