Electron gun from a cathode ray tube

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 microscopes and at the beginning of linear particle accelerators. Image File history File links Summary This is a close up photo of an Thermionic Electron Gun assembly found on a colour Samsung CRT monitor. ... Image File history File links Summary This is a close up photo of an Thermionic Electron Gun assembly found on a colour Samsung CRT monitor. ... Cathode ray tube employing electromagnetic focus and deflection Cutaway rendering of a color CRT The cathode ray tube or CRT, invented by Karl Ferdinand Braun, is the display device that was traditionally used in most computer displays, video monitors, televisions and oscilloscopes. ... Cathode ray tube employing electromagnetic focus and deflection Cutaway rendering of a color CRT The cathode ray tube or CRT, invented by Karl Ferdinand Braun, is the display device that was traditionally used in most computer displays, video monitors, televisions and oscilloscopes. ... It has been suggested that Selected area diffraction be merged into this article or section. ... A particle accelerator uses electric fields to propel charged particles to great energies. ...

It is formed of two parts: a metal filament, which is heated to create a stream of electrons (a thermionic emission), and an electric field, which accelerates them to reach the anode. Filaments surrounding a solar flare, caused by the interaction of the plasma in the Suns atmopshere with its magnetic field. ... Thermionic emission (archaically known as the Edison effect) is the flow of electrons from a metal or metal oxide surface, caused by thermal vibrational energy overcoming the electrostatic forces holding electrons to the surface. ... In physics, an electric field or E-field is an effect produced by an electric charge (or a time-varying magnetic field) that exerts a force on charged objects in the field. ... Diagram of a zinc anode in a Daniells cell. ...

Most colour CRTs (such as is used in a colour television set) is 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 colours. Color is an important part of the visual arts. ... The shadow mask is one of two major technologies used to manufacture cathode ray tube (CRT) televisions and computer displays that produce color images (the other is aperture grille). ... A phosphor is a substance that can exhibit the phenomenon of fluorescence (glowing during absorption of radiation of another kind) or phosphorescence (sustained glowing without further stimulus). ... A pixel (pix, 1932 abbreviation of pictures, coined by Variety headline writers + element) is one of the many tiny dots that make up the representation of a picture in a computers memory. ... This page is about the colors. ...

External links

• Howstuffworks.com: electron gun