Read-write head thermal compensation system

Details Read-write head thermal compensation system Read-write head thermal compensation system

G - Physics

11

B

352/21.3

G11B 5/58 (2006.01) G11B 5/55 (2006.01) G11B 21/10 (2006.01)

Patent

CA 1189186

ABSTRACT OF THE DISCLOSURE. "READ-WRITE HEAD THERMAL COMPENSATION SYSTEM". A thermal compensation system for positioning a read-write head relative to computer disk surface is a mechanical arrangement and uses different materials with different coefficients of thermal expansion, The interconnection of the different materials provides a primary thermal circuit and a compensating thermal circuit, in two separate chambers which have a steel shaft and circulating air in common. In response to a change in temperature the chambers thermally equalise; a mis- position of the read/write head in the primary circuit is compensated by the compensation circuit which causes the shaft to rotate to retain the read/write head at its original position relative to the disk surface. The principal materials used in the thermal circuits are aluminium and stainless steel. The position of the shaft and arm can be adjusted with respect to a line through the hub and shaft to optimise compensation over the track positions and the temperature range of the disk drive.

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