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:
Dec. 21, 1976
Filed:
Nov. 01, 1974
Applicant:
Inventors:
Kazuya Hosoe, Kawasaki, J;
Seiichi Matsumoto, Tokyo, J;
Assignee:
Canon Kabushiki Kaisha, Tokyo, J;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354 25 ; 250201 ; 352140 ; 356-4 ;
Abstract
In the system disclosed, a cylindrical lens or mirror compresses the image of an object illuminated by a beam, and a movable mirror coupled to the lens barrel of a lens system reflects the compressed image onto the dividing line between two photosensors. The unbalance between the outputs of the photosensors indicates the defocus of the lens system. A servo responds to the unbalance to refocus the system by moving the lens barrel and the mirror until the photosensor outputs are balanced.
Hosoe, Kazuya. (1976). Focus detecting system (U.S. Patent No. 3999192). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/3999192
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile