Title:
【発明の名称】電子管用陰極
Document Type and Number:
Japanese Patent JP2876591
Kind Code:
B2
Abstract:
An electron tube cathode comprises a base (1) formed mainly of nickel, an alloy layer (4) disposed on the base (1) and including nickel and tungsten having a grain size smaller than that of the base, and an electron emissive material layer (5) deposited on the alloy layer, and including an oxide (6) of an alkaline-earth metal containing at least barium, and a rare earth metal oxide (7) of 0.01 to 25 weight percent and containing at least one of scandium oxide and yttrium oxide. The cathode has a life characteristics improved compared with the prior art, even if operated with a current density of 3 A/cm<2> or more.
Inventors:
SAITO MASATO
TERAMOTO HIROYUKI
OOHIRA TAKUYA
TERAMOTO HIROYUKI
OOHIRA TAKUYA
Application Number:
JP31974896A
Publication Date:
March 31, 1999
Filing Date:
November 29, 1996
Export Citation:
Assignee:
MITSUBISHI DENKI KK
International Classes:
H01J1/14; H01J1/142; H01J1/20; H01J1/26; (IPC1-7): H01J1/26; H01J1/14; H01J1/20
Domestic Patent References:
| JP3257735A | ||||
| JP1267926A | ||||
| JP1315926A |
Attorney, Agent or Firm:
Kaneo Miyata (2 outside)