Kabushiki Kaisha Tokai Rika Denki Seisakusho

Yoichi Ishizaki

Katsuya Kogiso

Fumihiro Suzuki

Toru Minagawa

A magnetic sensor includes a magnetoresistive body that is disposed over a surface of an insulator, a protective film that is provided over a surface of the insulator, including over the magnetoresistive body, and an open portion that runs along at least a portion of a perimeter of the magnetoresistive body and penetrates the protective film in a thickness direction of the protective film. In the magnetic sensor, a separation distance between an inside wall of the open portion and the magnetoresistive body, this being a minimum distance with respect to the magnetoresistive body, is configured so as to be longer than an alignment margin dimension of the open portion with respect to the magnetoresistive body.

Magnetic sensor

A magnetic sensor that is inexpensive and suppresses changes in offset voltage caused by wear. The magnetic sensor includes magnetoresistance elements having electrical resistances that change in accordance with magnetism changes. The magnetic sensor detects magnetism based on changes in the electrical resistances. The magnetoresistance elements are covered by a protective film. Part of the protective film is etched and eliminated to form a recess.

Sensor

A magnetic sensor that prevents offset voltage from changing as time elapses. The magnetic sensor detects change in the direction of the magnetic field when the electric resistances of magnetic resistors change. The magnetic resistors of the magnetic sensor each include a heat treatment section formed by performing a pre-trimming heat treatment.

Growing community of inventors

Aichi, Japan

Yoichi Ishizaki