COLD-CATHODE ELECTRON SOURCE, MICROWAVE TUBE USING THIS, AND ITS MANUFACTURING METHOD

WIPO Patent Application WO/2004/088703

A1

A cold-cathode electron source of both high frequency and high output, a microwave tube using the same, and its manufacturing method are disclosed. An emitter (24) of the cold-cathode electron source has a sharp point so that the aspect ratio R may be 4 or more. As a result, the capacitance between the emitter (24) and a gate electrode (16) is small correspondingly to the distance from the gate electrode (16). Therefore, the cold-cathode electrons can behave in response to a high frequency. The material of the cathode of this cold-cathode electron source is diamond having a high melting point and a high thermal conductivity, not a conventional material such as tungsten or silicon. Even if the density of the current flowing through the emitter (24) is high, the emitter (24) hardly melts, and consequently the cold-cathode electron source can be adapted to high output.

TATSUMI NATSUO (JP)
IMAI TAKAHIRO (JP)

PCT/JP2004/004245

October 14, 2004

March 26, 2004

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SUMITOMO ELECTRIC INDUSTRIES (JP)
TATSUMI NATSUO (JP)
IMAI TAKAHIRO (JP)

H01J1/304; H01J3/02; H01J9/02; H01J23/04; H01J23/06; (IPC1-7): H01J1/304; H01J23/06; H01J9/02

JP2000188388A	2000-07-04
JP2000215788A	2000-08-04
JPH1092296A	1998-04-10
JP2001023505A	2001-01-26
JPH08315721A	1996-11-29
JPH08255558A	1996-10-01
JPH10208618A	1998-08-07
JP2003109493A	2003-04-11

See also references of EP 1594150A4
None

Hasegawa, Yoshiki (Ginza First Bldg. 10-6, Ginza 1-chome, Chuo-k, Tokyo 61, JP)

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