Patent ID: 7685698

Claim:
A method of manufacturing a magnet rotor, the method comprising the steps of: forming from a light transmitting resin a drive arm having a rotary shaft, said drive arm being attached to one end of the rotary shaft such that the drive arm extends in a direction perpendicular to the rotary shaft; forming a cylindrical permanent magnet with a hollow center portion from an anisotropic magnet having an axis of magnetization in which magnetism is aligned in a prescribed direction; positioning and supporting the drive arm in a fixture having a magnetic field in a predetermined direction and a fixing portion capable of holding the drive arm, said drive arm being disposed in a position directed to a predetermined direction with respect to the magnetic field of the fixture; applying a light curable resin to the rotary shaft of the positioned and supported drive arm; fitting the hollow center portion of the permanent magnet over the rotary shaft having the applied light curable resin from a side opposite to the drive arm; aligning the permanent magnet to a position where the direction of the axis of magnetization corresponds to the direction of the magnetic field of the fixture and magnetically holding the permanent magnet at said position; and irradiating the drive arm with light to cure the light curable resin and bond the permanent magnet and the drive arm.