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:
May. 16, 1978
Filed:
Dec. 27, 1976
Toshihiro Kondo, Kamiishihara, Chofu-shi, Tokyo, JA;
Fuji Photo Film Co., Ltd., Minami-ashigara, JA;
Other;
Abstract
A light refracting optical element such as a prism is inserted in the optical path of the objective of a camera substantially on the focal plane of the objective. The light refracting optical element is mounted on a transparent plate and periodically moved in a plane perpendicular to the optical path. A photodetector is provided on which an image of the real image formed by the objective is focused by way of a focusing lens. The photodetector is connected to an electric circuit which amplifies an alternating current component of the output of the photodetector. When the real image of the objective is formed on the light refracting optical element, the output of the photodetector does not contain an alternating component. When the real image of the objective is formed on a plane displaced from the light refracting optical element, the output of the photodetector contains an alternating current component having the same frequency as that of the periodical movement of the light refracting optical element.