Electron beam emission device

An electron beam emission device comprising:

• a housing which defines a space in which electron beams are accelerated, and has an opening at the other side thereof through which the electron beams are emitted;
• a cathode which is disposed at one side in the housing, and emits the electrons;
• an anode which is positioned in the housing so as to be spaced apart from the cathode toward the other side, and accelerates the electrons emitted from the cathode;
• and
• an insulation holder which insulates a portion between the cathode and the housing, and fixes the cathode,
• wherein the cathode has a surface which faces the anode and is formed concavely to have a gradient, and a rim of the surface of the cathode, which has the gradient, is formed to be rounded, and
• wherein a tube which is made of a metallic material and defines a lateral surface of the housing, is provided.

An electron beam emission device comprising:

• a housing which defines a space in which electron beams are accelerated, and has an emission port at the other side thereof through which the accelerated electron beams are emitted;
• a cathode which is disposed at one side in the housing, and emits the electrons;
• an anode which is positioned in the housing so as to be spaced apart from the cathode toward the other side, and accelerates the electrons emitted from the cathode;
• and
• a reflection electron blocking structure which is disposed in the housing, is formed to extend toward the anode from the periphery of the emission port of the housing, and blocks secondary electrons and backscattered electrons, which are reflected at the periphery of the emission port of the housing, from being reflected into the housing.