An electron gun (also called electron emitter) is an electrical component that produces an electron beam that has a precise kinetic energy and is most often used in televisions and monitors which use cathode ray tube technology, as well as in other instruments, such as electron microscopes and particle accelerators. Electron guns may be classified in several ways:
An ion gun consists of a cylinder, where gas enters from one end face, undergoes electron bombardment from the side walls, and an is subjected to an extraction voltage from the other end face. The entire cage has the role of the cathode, the extractor acts as the anode, and an unnamed ring takes the role of the Wehnelt cylinder.
Most color cathode ray tubes— such as those used in color televisions - are made up of three electron guns, each one producing a different stream of electrons. Each stream travels through a shadow mask where the electrons will impinge upon either a red, green or blue phosphor to light up a color pixel on the screen. The resultant color that is seen by the viewer will be a combination of these three.
Patent No. 7,732,764 Issued on June 8, Assigned to Hitachi for Field Emission Electron Gun, Electron Beam Applied Device (Japanese Inventors)
Jun 09, 2010; ALEXANDRIA, Va., June 11 -- Mitsuo Hayashibara and Shunichi Watanabe, both of Hitachinaka, Japan, Kishio Hidaka of Hitachiota,...