Elimination of Thermal Deformation in a Head-Arm for a Magnetic Disk Storage System.

This paper describes a head-arm in which thermal deformation is eliminated for a large-capacity magnetic disk storage system. This study uses two methods: measurement by holographic interferometry and calculation by finite element method (FEM). The head-arm is a laminated structure composed of aluminum, adhesive and a flexible printed circuit (FPC). By inserting stainless steel in the adhesive layer, thermal deformation can be eliminated. When the stainless steel is 16 μm thick, thermal deformation is reduced to one third of the older head-arm. The stainless steel must be 22-26 μm thick for deformation in the head-arm to be completely eliminated. In addition, the influence of FPC and IC chips on the head-arm is investigated.