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. 23, 1980
Filed:
May. 19, 1978
Masao Jyojiki, Saitama, JP;
Kazuo Nakamura, Asaka, JP;
Abstract
A single lens reflex camera including an objective having an optical axis for focusing an image of an object and a device for determining when the objective has properly focused an image at an image plane which is located at a position which is optically equivalent to the location of the film plane, the latter including an image-forming device including a first refracting device for receiving an image from the objective and for providing at least a pair of identical images of the object to be photographed at the image plane, a detecting plane provided along the optical axis having a pair of identical photosensitive detectors, each of which provides an output which varies as the image is moved longitudinally therealong and an image-transmitting device situated at least in part at the image plane which includes a second refracting device for receiving the images from a first refracting device and for participating in the transmission thereof to the detecting plane in a manner according to which the identical images simultaneously move equally in opposite directions along the pair of detectors in response to adjustment of the objective.