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An electron gun is a component that produces an electron stream that has a precise kinetic energy, being used in all TVs and monitors which use Cathode Ray Tube technology, and in other instruments, eg. Electron Microscope s and at the beginning of linear Particle Accelerators . It is formed of two parts: a Hot Cathode , which is heated to create a stream of electrons via Thermionic Emission , and electrodes generating an Electric Field , which accelerates the electrons towards the Anode . Most Colour CRTs (such as is used in a colour Television set) are made up of three electron guns, each one producing a different stream of electrons and which stream electrons through a Shadow Mask where the stream from each electron gun will impinge upon either a red, green or blue Phosphor to light up a colour dot of a Pixel of the screen, the resultant colour (or white) a combination of these three Primary Colour s. EXTERNAL LINKS |
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