Patent ID: 6480364
Filing Date: 2002-11-12
Classification: G11B

Abstract:
A positioning system comprising:a stationary magnet; a pivot housing having a front end, a back end, and an axis of rotation between the front and back ends, the front end including a front arm configured to extend over a rotatable disc, the back end having a first surface coupled to the front arm by a thermal conduit; a wire having a nominal radius R and a cross-sectional area A arranged in a coil having N turns and positioned to interact with the stationary magnet to effect positioning, the coil having a second surface facing the first surface, the first and second surfaces-separated by a gap containing a volume of a solid dielectric greater than N*A*R and a volume of air less than N*A*R, the gap having an average thickness greater than R so that the volume of dielectric can enter the gap, in which the solid dielectric thermally couples the coil to the front arm and inhibits electrical conduction across the gap.