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Vacuum variable capacitor
A vacuum variable capacitor is a variable capacitor which uses a high vacuum as the dielectric instead of air or other insulating material. This allows for a higher voltage rating〔 using a smaller total volume. There are several different designs in vacuum variables. The most common form is inter-meshed concentric cylinders, which are contained within a glass or ceramic vacuum envelope, similar to an electron tube. A metal bellows is used to maintain a vacuum seal while allowing positional control for the moving parts of the capacitor.〔http://www.hatdaw.com/papers/sb_12.pdf Service Bulletin ''Vacuum variable Capacitors'', retrieved 2012 March 12〕
==Invention==
Nikola Tesla filed a patent in 1896 for a vacuum capacitor. The original use was to enhance the quality of the electrical components for handling "currents of high frequency and potential". These components were necessary for the DC impulse research which Tesla was studying. Commercial products have been available since 1942.〔http://www.amstechnologies.com/fileadmin/amsmedia/downloads/4317_jenningscapacitorshighvoltagevacuumandgasfilled.pdf Jennings high voltage vacuum capacitors〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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