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:
May. 06, 1986
Filed:
Feb. 10, 1984
Applicant:
Inventors:
Seiichi Isoguchi, Hachioji, JP;
Hiroshi Takahashi, Hachioji, US;
Assignee:
Konishiroku Photo Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354403 ;
Abstract
The invention relates to an active type camera rangefinder for automatic focus. A beam of infrared light is emitted towards an object and the light reflected back from the object is received by a plurality of photo transistors. An automatic gain control adjusts the sensitivity of the phototransistors. An RC circuitry delays operation of the automatic gain control to eliminate low-frequency ripples caused by fluorescent lamps.