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electron gun

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.04 sec.

A device that creates a fine beam of electrons that is focused on a phosphor screen in a CRT.
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Such a CRT must be thick enough so that the electron gun isn't too close to the screen; otherwise, the image becomes distorted.
Fields of beams: carbon nanotubes crop up for big-screen TV by Weiss, Peter Ulrich / Science News
These advances include: (1) field-emission gun electron beam instruments such as scanning electron microscopes (FEG-SEMs) that have high brightness electron guns with excellent performance at low beam energies, [E.
The analysis of particles at low accelerating voltages ([less than or ... by Small, J.A. / Journal of Research of the National Institute of Standards and Technology
A similar process is at work in TV screens: An electron gun fires a beam into various metals embedded in the screen, which combine to produce a color picture.
Sky Show by STIEFEL, CHANA / Science World
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