MAGNETIC DISK STORAGE DEVICE

摘要

PURPOSE:To prevent the off-track due to the deformation of thermal expansion, by fastening tightly a housing of a spindle to a different member which is fitted and adhered from outside to a projected part of a base and setting the coefficient of thermal expansion of said member approximately equal to that of the housing and smaller than that of the base respectively. CONSTITUTION:A sleeve member 16 is formed with a material having a coefficient of thermal expansion equal to that of a housing 13 of a spindle and smaller than that of a base 1. The member 16 is fitted and adhered from outside to a circular wall part 18 at the fringe of a through hole 17 for the housing 13 of the base 1. A flange part 14 of the housing 13 is fastened and fixed to the member 16 by means of a bolt 15. Thus the thermal deformation which causes an inclination of the spindle 14 can be suppressed although the housing 13, the member 16 and the base 1 are expanded by the heat generated while a storage device is working since the coefficient of thermal expansion of the part 14 is equal to that of the member 16. Therefore the occurrence of the off-track is prevented.