Electron-emitting devices having variously constituted electron-emissive elements, including cones or pedestals
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United States of America Patent
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Sep 24, 1996
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app pub date -
Nov 24, 1993
filing date -
Sep 8, 1993
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Abstract
A gated electron-emitting device contains a multiplicity of electron-emissive elements, each formed with a pedestal (98) and an overlying cone (94.sub.1). In each electron-emissive element, the base diameter of the cone is greater than the element, the base diameter of the cone is greater than the diameter of the pedestal. With the pedestal being electrically conductive, the cone may be electrically resistive. Alternatively, each electron-emissive element can be an elongated element (30B) that reaches a maximum diameter at a point between, and spaced apart from, both ends of the element.
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