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. 13, 1980
Filed:
Mar. 13, 1978
Shinichi Kamachi, Hino, JP;
Nagahiro Gocho, Hachiodi, JP;
Olympus Optical Co., Ltd., , JP;
Abstract
An automatic focussing apparatus for microscopes includes a pair of photoelectric transducer elements disposed short of and beyond the imaging position, respectively, of an optical system which is used for the purpose of focussing. Each element is connected with a separate loop comprising an A/D converter which converts an output signal from the associated element corresponding to each picture element into a digital quantity, a sample-and-hold circuit, a calculation circuit which responds to the digital signal to derive an evaluation function, and an accumulator which stores the resulting value. The individual accumulators are connected with a comparison circuit, which is in turn connected with a focus control circuit controlling the optical system.