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:
May. 12, 2009
Filed:
Apr. 02, 2007
Toru Arakawa, Hyogo, JP;
Masaru Shimizu, Kyoto, JP;
Masami Segawa, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A rotation angle detection apparatus includes a main rotatable body, a pair of sub rotatable bodies, and a control circuit. The sub rotatable bodies are rotated in a linked motion with the rotation of the main rotatable body and are overlapped with each other. The control circuit detects a rotation angle from a rotation of one of the sub rotatable bodies, and detects a rotation phase difference between the rotation of one sub rotatable body and the rotation of the other sub rotatable body of the pair of the sub rotatable bodies. From the two detected signals, the control circuit calculates a rotation angle of the main rotatable body.