JPS5613637A - Directly heated type cathode structure - Google Patents

Directly heated type cathode structure

Info

Publication number
JPS5613637A
JPS5613637A JP8807479A JP8807479A JPS5613637A JP S5613637 A JPS5613637 A JP S5613637A JP 8807479 A JP8807479 A JP 8807479A JP 8807479 A JP8807479 A JP 8807479A JP S5613637 A JPS5613637 A JP S5613637A
Authority
JP
Japan
Prior art keywords
filament
heating
cathode structure
directly heated
type cathode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8807479A
Other languages
Japanese (ja)
Inventor
Takeo Tsunoda
Shigekazu Shibata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP8807479A priority Critical patent/JPS5613637A/en
Publication of JPS5613637A publication Critical patent/JPS5613637A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current

Abstract

PURPOSE:To lessen the breaking of wire by coating a desired portion of a filament wih a material decomposable by heating to oxide and also gradually reducible by a reductive impurity. CONSTITUTION:A negative electrode consisting of the base metal 24 and the electron-radiating substance layer 25 is placed on the center of the filament 27. The portion to be coated near the center of the filament 27 is coated with a material decomposable by heating to an oxide and also gradually reducible by reductive impurities. Thus, because the evaporation of the filament by heating is suppressed, the thinning of grain boundary can be avoided and the breaking of the filament 27 can therefore be lessened.
JP8807479A 1979-07-13 1979-07-13 Directly heated type cathode structure Pending JPS5613637A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8807479A JPS5613637A (en) 1979-07-13 1979-07-13 Directly heated type cathode structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8807479A JPS5613637A (en) 1979-07-13 1979-07-13 Directly heated type cathode structure

Publications (1)

Publication Number Publication Date
JPS5613637A true JPS5613637A (en) 1981-02-10

Family

ID=13932702

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8807479A Pending JPS5613637A (en) 1979-07-13 1979-07-13 Directly heated type cathode structure

Country Status (1)

Country Link
JP (1) JPS5613637A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62179996A (en) * 1986-02-04 1987-08-07 三菱鉛筆株式会社 Manufacture of ball pen tip

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62179996A (en) * 1986-02-04 1987-08-07 三菱鉛筆株式会社 Manufacture of ball pen tip

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