Patent ID: 8194358
Filing Date: 2012-06-05
Classification: G11B

Abstract:
1. A magnetic circuit for a voice coil motor, comprising a magnetic material yoke and magnet means disposed thereon, wherein the magnetic material yoke is configured to a triangular shape, a frusto-triangular shape in which the apex of a triangle is truncated or round, or an arcuate, crescent or semi-circular ring shape in which the bottom of a triangle at its center is recessed or cut-off in a semi-circular, triangle or apex-rounded triangular form, the magnet means on said yoke consists of a single magnet piece of rectangular prism or parallelepiped prism shape, and the single magnet piece is disposed on said yoke such that the longitudinal direction of said single magnet piece is parallel to a bottom of said yoke or a straight line connecting the lower ends of two oblique sides of said yoke.