Electron-emitting device having focus coating that extends partw

Details Electron-emitting device having focus coating that extends partw Electron-emitting device having focus coating that extends partw

1997-05-30

2000-01-11

O'Shea, Sandra

Electric lamp and discharge devices

Discharge devices having a multipointed or serrated edge...

313336, 313496, H01J 130, H01J 1924

Patent

active

060139749

ABSTRACT:
An electron-emitting device contains an electron focusing system (37 or 37A) formed with a base focusing structure (38 or 38A) and a focus coating (39 or 39A) that penetrates partway into a focus opening (40) extending through the base focusing structure above an electron-emissive element (24). The focus coating is normally of lower resistivity than the base focusing structure and thereby provides most of the focus control over electrons emitted by the electron-emissive element. The focus coating is typically formed by an angled deposition technique.

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