Disk drive with controlled reduced internal pressure

Details Disk drive with controlled reduced internal pressure Disk drive with controlled reduced internal pressure

1999-08-05

2000-11-07

Martin, David

Electricity: motive power systems

Automatic and/or with time-delay means

Motor load, armature or primary or secondary circuit current

318490, 360133, 369 772, H02P 700

Patent

active

061441783

ABSTRACT:
A rigid magnetic recording disk drive includes a vacuum pump attached to the disk drive housing for removing air from within the housing so that the disk drive is operated at a reduced internal gas pressure. The pump motor is controlled by control circuitry that receives an input signal representative of the pressure within the housing to enable the pressure to be maintained within a predetermined reduced pressure range. Because spindle motor current has been directly correlated with internal pressure, a signal representative of the spindle motor current is used as the input to the pump control circuitry. The pump control circuitry also prevents the pump from turning on until the spindle motor has reached its stable operating speed, and from turning on when the disk drive is reading or writing data. Because of the reduced internal pressure the disk drive operates at a significantly higher disk RPM with only a minimal increase in power consumption and without any increase in track misregistration.

REFERENCES:
patent: 4367503 (1983-01-01), Treseder
patent: 4514672 (1985-04-01), O'gwynn
patent: 5841607 (1998-11-01), Khan et al.
National Semiconductor Corp., "LM139/LM239/LM339--A Quad of Independently Functioning Comparators", Application Note 74, Jan. 1973.
A. Tietze, "Disk File with Reduced or Eliminated Air Effects", IBM Technical Disclosure Bulletin, vol. 23, No. 9, Feb. 1981, pp. 4310-4311.

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