Anti-Static Brush for Disk Drive Spindle
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Arm 10 bearing on the top of disk drive spindle 12 by the action of spring 14 effectively grounds spindle 12. Spindle 12 is rotatably mounted with respect to a machine frame by means of one or more bearings 16 each comprising bearing balls 18 and carries one or more magnetic disks 20. If bearings 16 are the only support between spindle 12 and the machine frame, spindle isolation results from an insulating oil film covering the raceways and balls 18 of bearings 16. Without other grounding, a static charge can build up on spindle 12 and, in turn, discharge directly or indirectly into the electronics of a magnetic head electrically reading or writing on magnetic disk 20 and cause magnetic read/write errors. Arm 10 effectively provides a positive ground for spindle 12 to prevent such static discharge and errors.