Motor Antistatic Brush and Spindle Seal for a Hard Disk File
Original Publication Date: 1985-Sep-01
Included in the Prior Art Database: 2005-Feb-19
A hermetically sealed spindle cap houses an antistatic brush for dissipating static buildup in a disk drive device. The sealed cap eliminates air flow through the spindle bearings and the need for a ferrofluid seal which is a source of magnetic contamination in hard file products. An offset brush placement reduces acoustic noise and requires minimum space. The motor antistatic brush 10 in the figure grounds a rotating spindle assembly 12 of a hard file to allow static charge buildup to drain off without creating a spark. Brush 10 is offset, as indicated at 14, from the center of a spherical rotating button 16 which is contacting the brush 10 to provide the ground for the rotating spindle assembly 12.