Electron source

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2006-07-04

2006-07-04

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Discharge devices having an electrode of particular material

C313S532000, C313S460000, C313S495000, C250S399000

Reexamination Certificate

active

07071604

ABSTRACT:
An electron gun (10) includes an electron multiplier (22, 22′, 22″, 110) has a receiving end (50, 50′, 50″) for receiving primary electrons and an output end (54, 54′, 54″) that emits secondary electrons responsive to primary electrons arriving at the receiving end. An electron emitter (20, 20′, 20″, 102) is arranged at the receiving end of the electron multiplier for supplying primary electrons thereto. At least one of an electrical and a magnetic focusing component (14, 16) is arranged at the open output end of the electron multiplier for focusing the secondary electrons to define an electron beam. In a suitable embodiment, the electron multiplier includes a generally conical substrate (74, 90) and an electron mirror (52, 521, 522, 523, 921, 922) including a high secondary electron yield film (70) disposed on an outer surface of the conical substrate.

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