Patent ID: 7045997
Filing Date: 2006-05-16
Classification: G01D,G01R

Abstract:
1. A magnetic detection apparatus comprising: a processing circuit being arranged apart from a magnetic moving member on a plane thereof, said processing circuit including a bridge circuit comprising a first magnetoelectric conversion element and a second maanetoelectric conversion element; and a magnet for applying a magnetic field to said first magnetoelectric conversion element and said second magnetoelectric conversion element and also applying a magnetic field to said magnetic moving member in a direction of an axis of rotation of said magnetic moving member; wherein said second magnetoelectric conversion element is arranged substantially on a center line passing through the center of said magnet on a line in opposition to said magnetic moving member when viewed along the direction of the axis of rotation of said magnetic moving member, so that a differential output can be obtained from the outputs of said first magnetoelectric conversion element and said second magnetoelectric conversion element; wherein said magnetic moving member comprises a disk-shaped member having teeth formed on its periphery and being movable in a circumferential direction thereof, and further comprising a magnetic guide arranged between said processing circuit and said magnet and having a pair of projected members in an opposed and spaced relation with respect to each other in the circumferential direction of said magnetic moving member, wherein said second magnetoelectric conversion element is arranged substantially on a center line between said pair of projected members, and said first magnetoelectric conversion element is arranged on a side of one of said pair of projected members.