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. 26, 2009
Filed:
Sep. 10, 2007
Joong K. Lee, Chatham, CA;
Joong K. Lee, Chatham, CA;
KSR Technologies Co., Ridgetown, CA;
Abstract
An inductive position sensor for position sensing includes a transmitter coil and a receiver coil, the receiver coil generating a receiver signal when the transmitter coil is excited by an alternating current source. A moveable coupler element modifies the inductive coupling between the transmitter coil and the receiver coil so that the receiver signal is sensitive to the coupler element position. For example, the coupler element may rotate about a common central axis of the transmitter coil and receiving coil. In further examples, a reference coil is configured so that a provided reference signal is substantially insensitive to variations in the angular position of the coupler element. A ratio between the receiver signal and the reference signal is sensitive to the coupler element position, but substantially insensitive to common mode factors that influence the reference signal and receiver signal to a substantially equal degree.