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We have developed a non-contact position sensor to obtain linear output using a ferro-magnetic magneto-resistance element (MRE) with good characteristics of endurance and extremely high sensitivity to low magnetic fields. This position sensor consists of a MRE and a rectangular magnet. It has an extremely stable and linear output, and good endurance to the environment, using saturated magnetic field characteristics of MRE. This non-contact position sensor has wide industrial applications and can be used for automotive parts.

A high-accuracy automotive rotation sensor with high-sensitivity has been developed using a ferro-magnetic resistance element, called MRE, which we have recently developed. This sensor composed of MRE and a multi-pole magnet, is a compact, environmental-resistive, low rpm detectable device with high hybrid circuit density including an electric signal processing circuit. The new sensor is especially designed for generating a double-frequency output to ensure a duty ratio for precise detection of rotation. The sensor is now used as a vehicle speed sensor capable of measuring from low rpm to high rpm, mounted directly onto the transmission. The sensor is not only considered to be a riable alternative to the conventional rotation sensor, but will be used in an expanding number of applications.