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. 17, 1991
Filed:
Jul. 06, 1990
Eiichi Kitajima, Yokohama, JP;
Akihiko Morishita, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
The present invention provides an apparatus for detecting a light receiving position, comprising: a light receiving portion including M.times.N light receiving elements arranged along a straight line at a predetermined pitch; a plurality of M digital circuits each for outputting a detection signal when an added level of an input signal exceeds a predetermined level, the M.times.N light receiving elements being connected to the M digital circuits for N by N, respectively; a plurality of N analogue circuits each for outputting the added level of the input signal, the light receiving elements connected to the M digital circuits for N by N respectively being connected to the N analogue circuits by N, respectively; and a calculating means connected to the M digital circuits and the N analogue circuits, for calculating a light receiving position of beam light incident to the light receiving portion, on the basis of outputs from the digital circuits and the analogue circuits.