Method and apparatus for preventing parasitic electrical dischar

Details Method and apparatus for preventing parasitic electrical dischar Method and apparatus for preventing parasitic electrical dischar

1989-02-15

1991-01-22

Pellinen, A. D.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

Specific conduction means or dissipator

361212, 369 72, 369126, G11B 540, H05F 100, H05F 300, H05F 302

Patent

active

049875140

ABSTRACT:
A method and apparatus for operating a magnetic disk drive having a pole piece spaced apart from a magnetic disk surface by a predetermined distance to effectively form two plates of a parasitic capacitance capable of sustaining an undesirable electrical discharge capable of destroying data on the disk either by random discharge between the pole piece and magnetic disk or by discharge into imperfections on the disk. The invention comprises a circuit and method for applying a DC voltage to the pole piece and for simultaneously applying a DC voltage to the magnetic disk surface which is approximately equal to the DC voltage applied to the pole piece and thereby preventing the above parasitic capacitance between the pole piece and the magnetic disk surface from charging to a level sufficient to sustain any electrical discharge.

REFERENCES:
patent: 3868550 (1975-02-01), Knauer et al.
patent: 4459691 (1984-07-01), Yamada
patent: 4585963 (1986-04-01), Wilkinson, Jr. et al.
patent: 4623952 (1986-11-01), Pexton
patent: 4670663 (1987-06-01), Fancher

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