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. 13, 1988
Filed:
Oct. 27, 1986
Tokio Suzuki, Iwaki, JP;
Tsutomu Sato, Iwaki, JP;
Alpine Electronics Inc., , JP;
Abstract
An apparatus for detecting an angle of rotation is disclosed which comprises a rotary magnet having four poles, two magnetic sensors of a ferromagnetic material disposed over the periphery of the rotary magnet so as to face the magnetic poles of the rotary magnet and to have a phase difference of 3.pi./8 therebetween, a signal generating portion for applying the magnetic sensors of a ferromagnetic material with a first and a second sine-wave signals having a phase difference of .pi./2 in electrical angle therebetween, a synthesizing portion for synthesizing signals output from both of first magnetic sensor of a ferromagnetic material and second magnetic sensor of a ferromagnetic material thereby to output a synthesized signal with a phase difference corresponding to an angle of rotation .theta. from the first sine-wave signal, and a rotational angle detecting portion for detecting the angle of rotation based on the phase difference.