Patent ID: 6392845
Filing Date: 2002-05-21
Classification: G11B,H02K

Abstract:
A stator magnet forming a voice coil motor with a closed coil, the closed coil being supported by an actuator arm in a rotatable manner at a predetermined rotation angle, has first and second side edges that extend substantially along different lines in radial directions whose center is a center of rotation of the actuator arm, and has an outer edge that connects edges of outer sides of the first and second side edges when viewed in the radial direction and extending substantially along an arc whose center is the center of rotation, the stator comprising:a first magnetic pole region located within a moving area of the first side edge to act on the first side edge; a second magnetic pole region located within a moving area of the second side edge to act on the second side edge, wherein polarity of the second magnetic pole region is opposite to polarity of the first magnetic pole region; and a third magnetic pole region located within a moving area of the outer edge to act on the outer edge, wherein polarity of the third magnetic pole region is the same as the polarity of the first magnetic pole region.