Patent ID: 9182249
Filing Date: 2015-11-10
Classification: G01D

Abstract:
1. A rotation angle detection device, comprising: a part to be detected, being attached to an object to be detected for rotation position; a magnetism collecting plate, being disposed opposed to the part to be detected, having a magnetosensitive face, extending in parallel to a rotation surface of said part to be detected; a first magnetism sensing element, being disposed on a first detection axis, the first detection axis extending in parallel to the magnetosensitive face of the magnetism collecting plate and being orthogonal to the axial direction of the rotation axis of said object to be detected, for detection of a magnetic flux component in the extending direction of the first detection axis; a second magnetism sensing element, being disposed on a second detection axis, the second detection axis crossing the first detection axis, extending in parallel to the magnetosensitive face of said magnetism collecting plate and being orthogonal to the axial direction of said rotation axis, for detection of a magnetic flux component in the extending direction of the second detection axis; and a signal output unit for outputting a signal according to a rotation position of said object to be detected, based on a result of detection by said first magnetism sensing element and said second magnetism sensing element, wherein said part to be detected is configured such that one half of said part to be detected comprises a magnet having respective magnetic poles and the other half of said part to be detected comprises a yoke made of a non-polarized, permeable material, such that the magnet and the yoke are arranged along the extending direction of said rotation surface, being connected to each other, and wherein the magnetic field generated from said part to be detected is biased from said rotation axis toward the extending direction of said rotation surface.