Electron-emitting device

摘要

A method of manufacturing an electron-emitting element ( 20 ) for emitting electrons from diamond includes the first step of forming a diamond columnar member ( 25 ) on a diamond substrate ( 21 ), and the second step of forming an electron-emitting portion ( 30 ) having a base portion ( 36 ) and a sharp-pointed portion ( 32 ) which is located closer to a distal end side than the base portion ( 36 ) and emits the electrons by performing etching processing with respect to the columnar member ( 25 ).