ELECTRON-TUBE CATHODE - MATSUSHITA ELECTRONICS CORP

Title:

ELECTRON-TUBE CATHODE

Document Type and Number:

WIPO Patent Application WO/1997/032330

Kind Code:

A1

Abstract:

An electron-tube cathode made by forming on the base material an emitter mainly comprising alkaline earth metal oxides prepared by depositing carbonates of alkaline earth metals including at least barium on the base material and pyrolyzing the carbonates in a vacuum, wherein the carbonates comprise a mixture of at least two kinds of alkaline earth metal carbonate crystal grains having different configurations. The cathode is improved in both cut-off variation and emission characteristics and is useful as a cathode of CRTs and a cathode of electron tubes used as electron guns of electron microscopes.

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Inventors:

SAKURAI HIROSHI (JP)
HAYASHIDA YOSHIKI (JP)
KUBO MASAYUKI (JP)
YAMASHITA KATSUYUKI (JP)

Application Number:

PCT/JP1996/000493

Publication Date:

September 04, 1997

Filing Date:

February 29, 1996

Export Citation:

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Assignee:

MATSUSHITA ELECTRONICS CORP (JP)
SAKURAI HIROSHI (JP)
HAYASHIDA YOSHIKI (JP)
KUBO MASAYUKI (JP)
YAMASHITA KATSUYUKI (JP)

International Classes:

H01J1/142; (IPC1-7): H01J1/142

Foreign References:

JPS4716994Y1

1972-06-14

Other References: