High brightness thermionic cathode

Details High brightness thermionic cathode High brightness thermionic cathode

2007-02-13

2007-02-13

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Discharge devices having an electrode of particular material

C313S309000, C313S336000, C313S34600R, C445S051000

Reexamination Certificate

active

10774693

ABSTRACT:
An improved thermionic cathode is provided. The cathode has a carbon-coated cone surface and reduced cone angle (e.g. typically 60 degrees or less) that delivers an electron beam with high angular intensity and brightness and exhibits increased longevity.

REFERENCES:
patent: 4528474 (1985-07-01), Kim
patent: 5356662 (1994-10-01), Early et al.
patent: 2002/0020822 (2002-02-01), Okunuki
patent: WO 01/15192 (2001-03-01), None
European Search Report dated Jun. 6, 2005.
XP-002330714, Davis P.R. et al. “The effect of oxygen pressure of volatility and morphology of LaB6 single crystal cathodes” Journal of Vaccum Science & Technology B (Microelectronics Processing and Phenomena) Jan.-Feb. 1986.

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