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. 24, 2010
Filed:
Oct. 03, 2005
Yoshinori Matsui, Hamamatsu, JP;
Haruyoshi Toyoda, Hamamatsu, JP;
Naohisa Mukozaka, Hamamatsu, JP;
Yukinobu Sugiyama, Hamamatsu, JP;
Seiichiro Mizuno, Shizuoka, JP;
Yoshinori Matsui, Hamamatsu, JP;
Haruyoshi Toyoda, Hamamatsu, JP;
Naohisa Mukozaka, Hamamatsu, JP;
Yukinobu Sugiyama, Hamamatsu, JP;
Seiichiro Mizuno, Shizuoka, JP;
Hamamatsu Photonics K.K., Hamamatsu-shi, Shizuoka, JP;
Abstract
An encoder calculates an absolute value of an operating angle of a scale plate. The scale plate includes light relay portions formed along an operational direction α in the scale plate with a pattern of a one-dimensional array of optically transparent portions and optically nontransparent portions. The encoder identifies the light relay portion formed on a light receiving region, based on second light intensity profile data V(m), and by using the patterns of optically transparent and optically nontransparent portions as codes. The position of a light relay portion can be accurately retrieved using reference positions for each light relay portion in the scale plate. The encoder calculates a center-of-gravity position of the identified light relay portion relative to a reference position in the light receiving region, based on first light intensity profile V(n), and calculates an operating angle of the scale plate from the center-of-gravity position.