Patent ID: 7030606
Filing Date: 2006-04-18
Classification: G01D

Abstract:
1. An angular sensor comprising: a stator; a rotor relatively rotatable to the stator on a z-axis; a first rectangular magnet fixed to the rotor; a second rectangular magnet fixed to the rotor opposing the first magnet; a magneto-electric transducer element fixed to the stator on the Z-axis to be positioned in a magnetic field generated between the first magnet and the second magnet, having a sensing surface which senses a magnetic flux density whose direction is in an X-axis perpendicular to the Z-axis, and operable to output an electric signal representative of the component of the X-axis direction of the magnetic flux density; and a deflection yoke made of magnetic material and fixed to the stator to be positioned in the magnetic field generated between the first magnet and the second magnet; wherein the first magnet has one magnetic pole which is facing the Z-axis and is magnetized to be an S-pole; the second magnet has one magnetic pole which is facing the Z-axis and is magnetized to be an N-pole; the S-pole of the first magnet and the N-pole of the second magnet are facing each other; and the deflection yoke is positioned facing the sensing surface of the magneto-electric transducer and is positioned within a range of three quarters of a distance between the first magnet and the second magnet opposing each other in the X-axis direction which is perpendicular to the sensing surface of the magneto-electric transducer and is positioned within a range of one half of the distance between the first magnet and the second magnet opposing each other in the Y-axis direction which is parallel to the sensing surface of the magneto-electric transducer; wherein the first magnet includes two magnets and the second magnet includes two magnets; and wherein said each magnet of the first magnet is fixed to the rotor keeping a predetermined distance from each other and said each magnet of the second magnet is fixed to the rotor keeping a predetermined distance from each other.