JPS56145639A - Electron gun - Google Patents

Electron gun

Info

Publication number
JPS56145639A
JPS56145639A JP4782680A JP4782680A JPS56145639A JP S56145639 A JPS56145639 A JP S56145639A JP 4782680 A JP4782680 A JP 4782680A JP 4782680 A JP4782680 A JP 4782680A JP S56145639 A JPS56145639 A JP S56145639A
Authority
JP
Japan
Prior art keywords
pyramid
electron gun
cathode
tip
emission density
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
JP4782680A
Other languages
Japanese (ja)
Inventor
Masaki Yamabe
Yasuo Furukawa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP4782680A priority Critical patent/JPS56145639A/en
Publication of JPS56145639A publication Critical patent/JPS56145639A/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
    • H01J1/16—Cathodes heated directly by an electric current characterised by the shape

Abstract

PURPOSE:To generate a uniform molding beam by forming the tip of a cathode in a pyramid. CONSTITUTION:The shape of the cathode tip of an electron gun is of a pyramid, for example, a square pyramid. A crystal is cut off so that a face 1 with a large thermoelectronic emission density can be the side of this square pyramid. There is little difference in the thermoelectronic emission density on the surface of the pyramid in an electron gun with such a cathode tip shaoe. As a result, the distribution of the emitted electron beam is uniformalized.
JP4782680A 1980-04-11 1980-04-11 Electron gun Pending JPS56145639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4782680A JPS56145639A (en) 1980-04-11 1980-04-11 Electron gun

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4782680A JPS56145639A (en) 1980-04-11 1980-04-11 Electron gun

Publications (1)

Publication Number Publication Date
JPS56145639A true JPS56145639A (en) 1981-11-12

Family

ID=12786148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4782680A Pending JPS56145639A (en) 1980-04-11 1980-04-11 Electron gun

Country Status (1)

Country Link
JP (1) JPS56145639A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100375848B1 (en) * 1999-03-19 2003-03-15 가부시끼가이샤 도시바 Method for manufacturing field emission device and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100375848B1 (en) * 1999-03-19 2003-03-15 가부시끼가이샤 도시바 Method for manufacturing field emission device and display device

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