Patent Number: 8,816,678

Title: Rotation sensor

Abstract: A magnetism detection elements are arranged in an arrangement direction substantially perpendicular to a tooth trace of a gear when viewed from a magnetism generation unit and send a signal according to a magnetic flux flowing between the gear and the magnetism generation unit. A detection unit detects rotation of the gear according to the signal. A case accommodates the magnetism detection elements. A movement restriction unit is equipped to the case and located on the side of the gear at a place between the magnetism detection elements to restrict a magnetic foreign matter, which adheres to the case, from moving in the arrangement direction of the magnetism detection elements.

Inventors: Kitanaka; Tatsuya (Nagoya, JP), Yokoyama; Hajime (Toyota, JP)

Assignee: Denso Corporation

International Classification: G01B 7/30 (20060101)

Expiration Date: 8/26/12018