Apparatus for magnetically detecting position or speed of moving body.

摘要

Magnetic poles are provided continuously with a pitch λ, on the peripheral portion of a drum rotated in accordance with a movement of a moving body. A magnetic sensor is provided in opposition to these poles. The sensor is formed of two magnetoresistive element pairs which are spaced from each other at λ/6, and the two elements in each pair are arranged in positions spaced from each other at λ/2. The two elements in each pair are connected in series to form a bridge circuit. The signals obtained from the nodes of the series-connected elements in the two element pairs are differtially amplified.

Owing to this structure, the third harmonic wave components are eliminated, and a signal having no distortion and representative of the position or speed of the moving body can be obtained.