Thread-type electron emission element

Details Thread-type electron emission element Thread-type electron emission element

2005-03-18

2009-02-03

Williams, Joseph L (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

C313S309000, C313S336000, C313S351000, C313S495000

Reexamination Certificate

active

07486011

ABSTRACT:
By making a cathode substrate function as a cathode and applying a voltage to the cathode and an anode, an electron emission element emits an electron from an electron source provided on the cathode substrate, and irradiates the electron onto an electron irradiation surface formed on the anode surface. The electron source is thread-type and provided on the cathode substrate. A deflecting voltage generates the electric field around the electron source. The electron source including a charge receives a power from the generated electric field to curve. Therefore, an irradiation position of the electron moves on the electron irradiation surface. Since it becomes unnecessary to move the electron irradiation surface and the electron source, a configuration of the electron emission element or an apparatus including the electron emission element is not complicated, and can be miniaturized and simple. Further, since the electron source curves, a tip of the electron source and the electron irradiation surface can be close, and a size of a beam spot at the irradiation position can be maintained constant. Therefore, since a mechanism for correcting the size of the beam spot is unnecessary, the configuration of the electron emission element or the apparatus including the electron emission element can be much simpler.

REFERENCES:
patent: 3822382 (1974-07-01), Koike
patent: 5786658 (1998-07-01), Tsukamoto et al.
patent: 07-182967 (1995-07-01), None
patent: 09-007240 (1997-01-01), None
patent: 2028692 (1995-02-01), None
T.H.P. Chang, L.P. Muray, U. Staufer and D.P. Kern, “A Scanning Tunneling Microscope Based Microcolumn System,” Jpn. J. Appl. Phys. vol. 31 (1992) pp. 4232-4240.

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