Patent ID: 6498706
Filing Date: 2002-12-24
Classification: G11B

Abstract:
A head carriage assembly comprising:head carriage which has a hub portion rotatably supported about a rotational center shaft on a base, and rotatably moves a head in a radial direction of a rotating disk; first driving unit which generates a force to rotate the head carriage; and second driving unit which generates a force to rotate the head carriage, the second driving unit being located at a position along a line extending from a rotational center of the head carriage and substantially perpendicular to a line connecting the rotational center and the head, wherein the second driving unit comprises: a coil secured outside the hub portion of the head carriage, and has an axial line vertical to a surface which includes the rotational center shaft on the base; and a magnetic circuit body which comprises a yoke and a permanent magnet, with a magnetic gap being formed therebetween, and engages the coil to be secured to the base, a part of the coil moving within the magnetic gap.