Apparatus for magnetically detecting position or speed or moving body utilizing bridge circuit with series connected MR elements

摘要

Magnetic poles are provided continuously with a pitch lambda 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 lambda /6, and the two elements in each pair are arranged in positions spaced from each other at lambda /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 differentially amplified so that 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.