Patent ID: 7019516
Filing Date: 2006-03-28
Classification: G01D

Abstract:
1. A magnetic sensor unit unit comprising: an actuator motor having a magnetic circuit; and a magnetic position sensor for magnetically detecting a rotational position of the actuator motor, the magnetic position sensor including; wherein the magnetic flux detecting means is disposed in a position and a direction outside of the magnetic circuit, where the magnetic flux detecting means is substantially unresponsive to leaking magnetic flux of the magnetic circuit, wherein: the magnetic circuit includes two motor magnets, wherein the motor magnets are disposed apart, and opposed surfaces of the motor magnets are magnetized in different magnetic poles; and the magnetic detecting means is disposed to detect the magnetic flux, wherein a direction of the magnetic flux detecting means to detect the magnetic flux penetrates through magnet clearances between the motor magnets and is perpendicular to a direction from one of the motor magnets to the other.