Electron gun with a focusing anode, forming a window for said gun and application thereof to irradiation and sterilization
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United States of America Patent
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Sep 21, 2010
Grant Date -
Jun 28, 2007
app pub date -
Oct 19, 2004
filing date -
Oct 20, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electron gun includes a sealed chamber under vacuum. A cathode having an emitting face is placed inside the chamber. An anode forms a sealed window, formed facing the emitting face in one of the walls of the chamber. The anode is capable of allowing electrons emitted by the emitting face to pass through. A biasing apparatus sets up a voltage between the anode and the cathode, capable of accelerating these electrons towards the anode, the electrons thus accelerated forming a beam that passes through the anode. The anode and the emitting face each have a curvature, the curvature of the anode making it capable of resisting a pressure difference between the inside and the outside of the chamber and being designed to cooperate with the curvature of the emitting face to focus the electron beam outside the chamber.
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