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. 08, 2001
Filed:
Aug. 11, 1999
Tamio Umehara, Iwata-gun, JP;
Akio Takayama, Iwata-gun, JP;
Hideki Kato, Iwata-gun, JP;
Akiyo Yuguchi, Iwata-gun, JP;
Minebea Co., Ltd., Nagano-ken, JP;
Abstract
A magnetic sensor includes: an oscillating circuit for allowing an a.c. magnetic field into a magnetic impedance element made of a ferromagnetic substance, having first and second electrodes on both ends thereof in a longitudinal direction thereof and having a structure in which a bias coil and a negative feedback coil are wound around the ferromagnetic substance through an insulator; a detecting circuit for detecting an a.c. voltage of the magnetic impedance element due to a change in the impedance of the magnetic impedance element which is caused by an applied external magnetic field; a peak holding circuit for holding the peak value of the output voltage of the detecting circuit; and an amplifying circuit for differentially amplifying the output of the peak holding circuit.