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:
Feb. 24, 1981
Filed:
Jan. 30, 1979
Toshihiro Imai, Hachiouji, JP;
Yoshisada Hayamizu, Hachiouji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A focusing optical system for single-lens reflex cameras comprising a quick return mirror having a section of incidence formed by removing a portion of the surface of said mirror and an emerging section, and a detector element which is arranged in the vicinity of said section of incidence. Said focusing optical system is adapted in such a manner that a portion of the light emitted from an object to be photographed is allowed to pass through said section of incidence into the inside of said quick return mirror, reflect on the inner surfaces of said quick return mirror, emerge from said emerging section and then is detected with said detector element, thereby permitting accurate detection without hindering observation through a finder of single-lens reflex cameras.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile