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:
Jun. 13, 1978
Filed:
Dec. 03, 1975
Seiichi Matsumoto, Yokohama, JA;
Canon Kabushiki Kaisha, Tokyo, JA;
Abstract
The photo-sensing circuit of the present invention has output characteristics which are linear for a wider range than that of a conventional photo-sensing circuit. In this invention the amount of incident light of the photographing field which is to be sensed is converted to an electric signal by a photo-electromotive element. A photo-conductive element, having its resistance value varied corresponding to the amount of incident light from the photographing field which is sensed, is connected as a load resistance to the above mentioned photo-electromotive element. Therefore the saturation level of the output characteristics of said photo-electromotive element varies corresponding to the amount of incident light into the photo-conductive element.