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:
Nov. 09, 1999
Filed:
Oct. 21, 1997
Atsushi Ieki, Gifu, JP;
Okuma Corporation, Aichi, JP;
Abstract
The optical encoder is capable of detecting phases at positions which coincide more strictly than the phase detecting positions of a conventional optical encoder, and is thereby capable of outputting less distorted displacement signals with a sufficient averaging effect and detecting the phases more accurately. An amount of a light having passed through a first grating is received directly with a light receiving section and output as an electric signal. On the basis of the fact that the electric signal is varied dependently on a relative displacement between the first grating and the light receiving section, the relative displacement is detected. The light receiving section includes a plurality of grating-like photo detecting devices which have fine widths and are arranged in a grating-like shape in a mixed manner within a minute section so as to correspond to four phases. Further, the photo detecting devices are composed of divided and minute photo detecting elements so as to have widths which are not definite but have such values as to eliminate the distorted component of high orders.