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:
Apr. 29, 1980
Filed:
Sep. 26, 1978
Yasuhisa Sato, Kawasaki, JP;
Sadahiko Tsuji, Yokohama, JP;
Kazuo Ishikawa, Yokohama, JP;
Susumu Matsumura, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A camera according to this invention includes a diffracting means disposed in the optical path of the object image forming light for a finder. The diffracting means is illuminated by a light source also provided within the body of the camera so as to exit the diffracted light toward the object side. A person who stands on the object side as an object can ascertain whether or not he is within the area of the object field to be photographed by the camera. Also, in taking a picture of himself with a camera mounted on a tripod using a self-timer, he can, while standing on the object side, obtain information about the self-timer through a photographic lens. According to one preferred embodiment of the invention, as the diffracting means, there is used a volume type phase diffracting means to avoid any adverse effect of the diffracting means on the object image forming light in which the diffracting means is placed.