CATHODE FOR ELECTRON TUBE - MATSUSHITA ELECTRIC WORKS LTD

Title:

CATHODE FOR ELECTRON TUBE

Document Type and Number:

Japanese Patent JPH0668845

Kind Code:

A

Abstract:

PURPOSE: To reduce consumption of an emitter due to ion impact, and enable application of a cathode as a direct heat type device.

CONSTITUTION: A main material 1 comprises a thin plate of tungsten, and it has a zig-zag shape like a crank. The main material 1 has a number of fine recesses 3 in the surface, and an emitter 2 comprising electron emitting material is filled in each recess. As the emitters 2 are filled in the recesses 3, an exposed surface of the emitters 2 to the surface area of the main material 1 becomes small, and a consumption speed by ion impact or vaporization is reduced. Since the main material 1 is formed in a zig-zag line, an electric resistance between both ends of the main material 1 can be set large, and thereby a cathode can be applied as a direct heat type device.

Inventors:

HAYASHIDA NOBUHIRO
SUGIMOTO MASARU
KONDO YUKIHIRO

Application Number:

JP21593292A

Publication Date:

March 11, 1994

Filing Date:

August 13, 1992

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC WORKS LTD

International Classes:

H01J61/067; (IPC1-7): H01J61/067

Domestic Patent References:

JPS63207043A	1988-08-26
JPS55144643A	1980-11-11

Attorney, Agent or Firm:

Ishida Chochichi (2 outside)

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