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:
Sep. 25, 1990
Filed:
Jun. 30, 1989
Yasuo Suda, Yokohama, JP;
Kazuhiko Arakawa, Kawasaki, JP;
Keiji Ohtaka, Tokyo, JP;
Takeshi Koyama, Tokyo, JP;
Ichiro Ohnuki, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a focus detecting device has a plurality of optical systems each forming a pair of light distributions whose relative position varies in conformity with the focus adjusted state of an objective lens. The optical systems are disposed so that the direction in which the relative position of the light distributions is varied differs. Focus detecting sensors are provided for receiving the relative position of the light distributions, an the optical systems are constructed so that the optical spacing between the centers of gravity of the areas in which light beams passed through one of the optical systems differs from the optical spacing between the centers of gravity of the areas on another of the optical systems.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile