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:
Nov. 09, 1999
Filed:
Nov. 01, 1996
Hideki Umemoto, Tokyo, JP;
Naoki Hiraoka, Tokyo, JP;
Wataru Fukui, Tokyo, JP;
Yutaka Ohashi, Tokyo, JP;
Masahiro Yokotani, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A sensing device capable of outputting a correct signal precisely corresponding to a particular position (angle) of, for example a protruding or recessed portion of a rotating member made of a magnetic material as soon as the electric power of the sensing device is turned on. The sensing device includes: a magnet for generating a magnetic field; a rotary member of magnetic material for changing the magnetic field generated by the magnet, the rotary member being disposed at a predetermined distance apart from the magnet; a giant magnetoresistance device which changes in resistance in response to the magnetic field whose magnitude is changed by the rotary member of magnetic material; and a differential amplifier for detecting the displacement of said rotary member of magnetic material and also the relative position of said rotary member of magnetic material with respect to said giant magnetoresistance device when said rotary member of magnetic material is at rest, on the basis of the output signal of said giant magnetoresistance device.