The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 1984
Filed:
Apr. 25, 1983
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354404 ; 358227 ;
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.