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Frictionless, Rotating Electrostatic Discharger

IP.com Disclosure Number: IPCOM000044455D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Martin, ES: AUTHOR

Abstract

This device provides a non-mechanical discharge path for electrostatic charges built up on rotating parts, such as rotating disk files. A small radioactive source, such as polonium, is placed next to the rotating shaft. This provides an ionized path for the discharge of the static charge from the rotating shaft. Current practice for the discharge of electrostatic charges from rotating disk files is to use a copper wiper on a carbon button to control static on rotating parts. This has the disadvantage of creating both copper and carbon particles which can cause head/disk crashes. Another technique uses mercury as a low friction electrical contact. If sealed, the seal can generate particulate contamination. If unsealed, the mercury device can only be used in a vertical orientation.

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Frictionless, Rotating Electrostatic Discharger

This device provides a non-mechanical discharge path for electrostatic charges built up on rotating parts, such as rotating disk files. A small radioactive source, such as polonium, is placed next to the rotating shaft. This provides an ionized path for the discharge of the static charge from the rotating shaft. Current practice for the discharge of electrostatic charges from rotating disk files is to use a copper wiper on a carbon button to control static on rotating parts. This has the disadvantage of creating both copper and carbon particles which can cause head/disk crashes. Another technique uses mercury as a low friction electrical contact. If sealed, the seal can generate particulate contamination. If unsealed, the mercury device can only be used in a vertical orientation. The use of a radioactive source, such as polonium, has the advantages of being frictionless, noncontaminating and usable in any orientation.

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