| 摘要 |
A position detector device for detecting the position of a moving object includes a magnetically-recorded section on a moving surface of the moving object where multipoles are magnetized with a wave-length of lambda , and a magnetic sensor for detecting changes in magnetic field by moving of the magnetically-recorded section. The magnetic sensor is provided with 2N (N+1, 2, 3, . . . ) pieces of signal detecting magnetic resistance elements connected to constant-current power sources and arranged at an interval of lambda /2(N+2). The extent to which the moving object is moved is detected on the basis of electric signals outputted from these signal detecting magnetic resistance elements.
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