Automatic focussing apparatus

Details Automatic focussing apparatus Automatic focussing apparatus

1983-04-25

1984-11-27

Adams, Russell E.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358227, G03B 310

Patent

active

044848064

ABSTRACT:
The present invention relates to an automatic focussing apparatus for a television camera using video signal and comprises a variable optical path means, for example, an optical glass and a piezo-electric device disposed in an optical pass, and the automatic focussing apparatus varies minutely an optical path length responding to given frequency and controlls lens position using a given frequency component which is derived from a high frequency component in said video signal in a manner that said high frequency component becomes maximum.

REFERENCES:
patent: 4370038 (1983-01-01), Kimura

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