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:
Aug. 30, 1988
Filed:
Dec. 23, 1986
Motonobu Matsuda, Kawachinagano, JP;
Yoshihiro Tanaka, Osaka, JP;
Motohiro Nakanishi, Kobe, JP;
Nobuyuki Taniguchi, Nishinomiya, JP;
Hiroshi Ootsuka, Sakai, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A distance measuring apparatus of the present invention converges the reflected light on objects through a converging lens and detects the light by a multi-divisional photodiode. The multi-divisional photodiode comprises a plural number of light receiving elements so that each of the light receiving elements detects the reflected light from the corresponding object to provide an electric signal according to the quantity of reflected light. The quantity of light in the peripheral portions of the flash or the converging lens is inherently smaller than the quantity of light in the central portion thereof. This distance measuring apparatus is improved so that a constant electric signal is obtained by any of the light receiving elements as far as the distance to the objects is constant. For example, such improvement is made in a manner in which: the quantity of received light of the central portion is limited by a filter provided between the converging lens and the multi-divisional photodiode; the light receiving areas of the light receiving elements are increased in peripheral portions of the multi-divisional photodiode compared with those in the central portion thereof; or the obtained electric signal is electrically corrected.