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:
Dec. 31, 1985
Filed:
Sep. 17, 1984
Asahi Seimitsu Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention relates to an automatic diaphragm control device for use with a CCTV camera in which a video signal applied from the CCTV camera is utilized for diaphragm control, and provides an automatic diaphragm control device for use with the CCTV camera, comprising first means for continuous control of the video signal with respect to an absolute brightness of an object to be picked up, second means for continuous control of a proportion of the video signal corresponding to a bright portion in the whole picture when a ratio of the bright portion to a dark portion of this object is relatively high, and third means for stabilization of a control signal, which has been obtained by said first and second means and then rectified, with respect to a source voltage.