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. 18, 2005
Filed:
Jan. 29, 2004
Yoichi Ohmura, Tokyo, JP;
Toru Oka, Tokyo, JP;
Hajime Nakajima, Tokyo, JP;
Hirokazu Sakuma, Tokyo, JP;
Takashi Okamuro, Tokyo, JP;
Yoichi Ohmura, Tokyo, JP;
Toru Oka, Tokyo, JP;
Hajime Nakajima, Tokyo, JP;
Hirokazu Sakuma, Tokyo, JP;
Takashi Okamuro, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A scale generates a periodic light-intensity distribution pattern having a pitch upon irradiation by emission light from a light source. Light-detecting element groups are shifted relative to the scale to generate phase signals having fixed phase differences. Light-detecting elements are adjacently positioned to have the same phase to form each light-detecting element group. Area centers of gravity on a phase axis of the light-detecting element groups having a fixed phase difference are made coincident with each other.