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:
Dec. 11, 2012
Filed:
Mar. 31, 2008
Masato Shimizu, Osaka, JP;
Naoki Toyota, Osaka, JP;
Shiro Tsuduki, Osaka, JP;
Hosiden Corporation, Osaka, JP;
Abstract
Disclosed is a device for accurately detecting the direction and angle of rotation independently of ambient environments. The device is provided with an equally-spaced electrode holding platehaving equally-spaced electrodesarranged along the circumference of a first circle, and a fixed phase electrode holding plate having α a-phase electrodes and β b-phase electrodes both arranged along the circumference of a second circle opposite the first circle, wherein when α is equal to or greater than 2, two arbitrary ones of the a-phase electrodes are at positions displaced an angle of an integral multiple of 2π/N apart on the circumference of the second circle in the rotation direction. When β is equal to or greater than 2, two arbitrary ones of the b-phase electrodes are at positions displaced an angle of an integral multiple of 2π/N apart on the circumference of the second circle in the rotation direction. The phase electrodes are arranged so that the a-phase electrodes and the b-phase electrodes are not displaced an angle of an integral multiple of π/N on the circumference of the second circle in the rotation direction.