MANUFACTURE OF ELECTRON EMITTING ELEMENT

• Main Author: NAKAJIMA YASUHIDE
• Format: Patent
• Language: English
• Published: 18.06.1999
• Edition: 6
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY

PROBLEM TO BE SOLVED: To easily form an element with sharp tip by holding a fine body made of a material for forming an electron emitting element between two substrates, heating the fine body to a temperature not lower than the melting point of the fine body, and then extending the fine body by parting the substrates and cutting the fine body at the middle part while cooling the fine body. SOLUTION: Ultra fine particle bodies 21 made of a material for forming an electron emitting element in number of 1-100 to one light emitting anode 1 are mounted on an electron emitting substrate 12 such as a glass substrate or a ceramic substrate formed with a circuit layer 13. The material of the particle bodies 21 is an alloy having a melting point in a range from 450 to 500 deg.C and spherical or square pillar body with 0.1-5 μm of diameter. The particle bodies 21 are held between a substrate 12 and a substrate 22 and heated to a temperature higher than the melting point of the alloy material of the electron emitting element by 5-10 deg.C to melt and deposit the bodies on the substrates and while being cooled, the substrate 12 and the substrate 22 are parted. The particle bodies are extended and extremely thinned in the middle parts and finally cut to give electron emitting elements 14 having sharp tips suitable for electron emission.