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:
Jul. 18, 2006
Filed:
Sep. 22, 2005
Norihiro Kurumado, Kasugai, JP;
Norihiro Kurumado, Kasugai, JP;
Denso Corporation, Kariya, JP;
Abstract
A rotation detecting device includes a rotary member having teeth, a biasing magnet, a magnetic sensor unit and a differential amplifier circuit for providing an output signal Vd. The sensor unit includes four bridge circuits of magnetoresistive elements that provide voltage signals V, V, V, V. The differential amplifier circuit includes a first differential amplifier for providing a first signal that is a difference between the voltage signals V, V, a second differential amplifier for providing a second signal that is a difference between the voltage signals V, V, a first circuit for providing a first amplified signal of the first signal amplified by a variable gain α, second circuit for providing a second amplified signal of the second signal amplified by a fixed gain and a third differential amplifier for providing the output signal Vd by a difference between the first amplified signal and the second amplified signal. The variable gain is adjusted to provide a minimum air-gap characteristic point that corresponds to a fixed rotation angle relative to the teeth.