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US 4,393,967 AGranted
Electrostatic clutch
AssigneeInternational Business Machines Corporation
InventorsJerome J. Cuomo, Alfred J. Landon, Han C. Wang
Life of this patent
Estimating the term…
Abstract
An electrostatic clutch operable by the Johnsen-Rahbek effect, which may be used to operate, e.g., a print hammer device, is described, said clutch comprising a rotatable drum and a band engagable therewith, wherein the engagable surface of the drum is a semiconductive surface prepared by sputtering or vapor depositing a layer of substantially pure silicon carbide onto a conductive substrate.
Claims24
An electrostatic clutch operable by the Johnsen-Rahbek effect, comprising:
- a rotatable drum and a band engageable therewith, said drum including an engageable surface which is a semiconductive surface comprising a layer of substantially pure silicon carbide on a conductive substrate, said layer having a thickness between about 10 .mu.m and 2,500 .mu.m and containing a dopant in an amount effective to cause the resistivity of the layer to be within a range of from about 10.sup.5 to 10.sup.7 ohm-cm.
Dependencies are inferred from the claim text.