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:
Mar. 25, 2003
Filed:
Feb. 22, 2001
Hironori Kato, Miyagi-ken, JP;
Yoshio Sanpei, Miyagi-ken, JP;
Toshiyuki Hoshi, Miyagi-ken, JP;
Hirofumi Okumura, Miyagi-ken, JP;
Ichiro Tokunaga, Miyagi-ken, JP;
Toshio Ogawa, Miyagi-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A rotational angle detecting apparatus having a rotation detector that outputs, as a rotor coupled to a rotating member rotates, first and second detection signals, which have predetermined amplitudes, the same cycle, and a phase difference of a quarter wavelength, a memory for storing the first and second detection signals, and a control unit. The control unit detects the rotational angle of the rotating member by averaging the amplitudes of the first and second detection signals according to the area in which the first detection signal lies.