Patent Number: 6,310,475

Title: Magnetic sensor having magnetic detectors arranged in a direction orthogonal to a relative moving direction

Abstract: A magnetic sensor for detecting magnetic fields deriving from a magnetic body to detect any magnetic body on a non-magnetic body by moving relative to the non-magnetic body in prescribed relative moving directions along the surface of the non-magnetic body includes a magnetizing magnet in which a line connecting the N and S poles thereof is a direction substantially orthogonal to, and of which one pole is arranged either in contact with or in proximity to, the surface of the non-magnetic body; and a magnetism detecting element having two magnetic detectors arranged along a magnetic field detecting direction, the magnetic field detecting direction being orthogonal to the relative moving directions in a surface parallel to the surface of the non-magnetic body, wherein the magnetic body is magnetized by the magnetizing magnet along with the movement relative to the non-magnetic body, and magnetic fields according to the quantity of the magnetized part of the magnetic body are differentially detected by the two magnetic detectors of the magnetism detecting element.

Inventors: Kawase; Masahiro (Higashimatsuyama, JP), Hara; Koichi (Saitama, JP), Suzuki; Naruki (Chichibu, JP)

Assignee: Canon Denshi Kabushiki Kaisha

International Classification: G01D 5/12 (20060101); G01D 5/16 (20060101); G01R 33/028 (20060101); G01R 033/00 (); G01R 033/12 (); G01N 027/72 (); G07D 007/04 (); B07C 005/344 ()

Expiration Date: 10/30/2018