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. 25, 1982
Filed:
Oct. 19, 1979
Applicant:
Inventors:
Yoshio Nakajima, Hachioji, JP;
Shuichi Takayama, Hachioji, JP;
Kosaku Tsuboshima, Hachioji, JP;
Teruo Iwasawa, Mitaka, JP;
Masafumi Yamazaki, Okaya, JP;
Assignee:
Olympus Optical Company Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250204 ; 354 25 ;
Abstract
An apparatus for detecting an in-focused condition of optical systems by using two values of indices of performance each derived from the number of differences between illumination signals obtained per picture element, comprising first and second image sensors arranged in front of and in the rear of a focal plane of the optical system, first and second analog data processing circuits, and a comparing means.