Magnetic head for sensing the position of a moving member

摘要

Disclosed is a magnetic head for use to constitute a position encoder which comprises a magnetic recording medium carrying records provided by a plurality of unit magnets arrayed with a constant pitch lambda on the surface of a moving member. The magnetic head is fixedly disposed opposite to the magnetic recording medium to constitute the position encoder. The magnetic head comprises a bridge circuit of four U-shaped arms each of which is formed by a pair of magnetoresistive elements spaced apart by an interval of ( lambda /2)(1+n), where n is zero or a positive integer.