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:
Oct. 02, 2007
Filed:
Aug. 19, 2005
Norikazu Okada, Kashihara, JP;
Norikazu Okada, Kashihara, JP;
Sharp Kabushiki Kaisha, Osaka-shi, JP;
Abstract
Given n move information signals and m slits(n and m: positive integers), the number of photodiodes associated with the m slitsis set to n×m(a: a positive integer). By doing so, all of the (n×m) photodiodescan necessarily be positioned evenly in units of an equal number against the slitsand the move information signals. Also, the photodiodes can be subdivided more than in a conventional optical encoder having photodiodes counting a number represented by m×n, which is a common multiple of the number m of the slitsand the number n of move information signals. Thus, with light reception area of each photodiode reduced, shifts, distortions, variations and the like of the move information signals can be suppressed, resolution can be enhanced, and accurate move information signals can be obtained.
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