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:
Feb. 19, 1985
Filed:
Jun. 21, 1982
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358227 ;
Abstract
An auto-focusing system for a video camera using the focus signal extracted by a focus signal extracting device from high-frequency components of the video signal. A gate circuit is provided in front of the focus signal extracting device and the gate circuit is made conductive or non-conductive depending on the magnitude of the focus signal thereby to control the quantity of the video signal received by the focus signal extracting device, whereby the dynamic range of the focus signal extracting device is virtually expanded.