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:
Jan. 01, 1985
Filed:
Aug. 24, 1982
Takeomi Suzuki, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of focus detection is disclosed, in which at least two pairs of light receiving element rows are arranged with respect to a photographing lens, and light splitters, each of which wave front splits the light flux from the photographing lens into two light fluxes, are provided for the respective light receiving element rows in the light receiving element row pairs. Light intensity distributions detected by the light receiving element rows at least between two light receiving element row pairs are compared to determine whether an image forming plane is in pre- or post-focus or in focus. Contrast signal values of the object image detected from the light receiving element rows between the light receiving element rows of at least one of the light receiving element row pairs are compared to determine whether the image forming plate is in pre- or post-focus or in focus. The result of at least either comparison is used for focus adjustment.