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. 12, 1981
Filed:
Mar. 27, 1979
Applicant:
Inventors:
Kiyoshi Kitai, Shikawatashi, JP;
Shinji Nagaoka, Shikawatashi, JP;
Yuzuru Takazawa, Shikawatashi, JP;
Assignee:
Seiko Koki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250201 ; 354 25 ;
Abstract
The system is provided with an optical means capable of forming images obtained through a first light passage and a second light passage. A light detecting system is formed of a plurality of light responsive elements which receive the image. A focus detection signal is obtained by detecting the differential between the maximum and the minimum intensity of the light pattern or the maximum ratio of the maximum intensity to the minimum intensity using the electric output of the light responsive elements corresponding the light pattern of a composite image.