Title:
CATHODE FOR ELECTRON BEAM WELDER
Document Type and Number:
Japanese Patent JPH065238
Kind Code:
A
Abstract:
PURPOSE: To make defocusing hard to occur even if an electron emitting face is sputtered by long time welding in order to allow stable welding for a long time.
CONSTITUTION: A hollow 10 is provided on the central part of an electron emitting surface 101 of a rod-shaped hot cathode 1. In spite of sputtering during welding, since the part of the hollow 10 is mainly sputtered, a change amount of an effective electron emitting area of the cathode surface is small.
Inventors:
SAKURAI KOICHI
YAMANE YOSHIO
MURAKAMI EISHIN
SASAKI SHIGEO
YAMANE YOSHIO
MURAKAMI EISHIN
SASAKI SHIGEO
Application Number:
JP15930392A
Publication Date:
January 14, 1994
Filing Date:
June 18, 1992
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
B23K15/00; H01J1/20; H01J37/06; H01J37/075; H01J37/315; (IPC1-7): H01J37/06; B23K15/00; H01J1/20; H01J37/075; H01J37/315
Attorney, Agent or Firm:
Takada Mamoru
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