Patent ID: 6721125
Filing Date: 2004-04-13
Classification: G11B

Abstract:
A position sensing system for sensing a position of a transducer carried by a microactuator at a distal end of a primary actuator, the microactuator having a voice coil motor coil, the position sensing system comprising:a fixed member attached to the primary actuator; a moveable member attached to the fixed member by an attachment device which permits the moveable member to move in relation to the fixed member along a predetermined pathway wherein voice coil motor coil is affixed to the moveable member; a pair of terminals at opposite ends of the voice coil motor coil for receiving a high frequency signal applied to the voice coil motor coil; and a sense coil attached to the fixed member and positioned near enough to the voice coil motor coil to receive a measurable portion of the high frequency signal transmitted from the voice coil motor coil through mutual magnetic coupling.