Cathode rays are not visible, but they were first identified in early vacuum tubes when they impacted the tube's glass wall, energizing the atoms and causing them to emit light-a glow known as fluorescence.In simple words, rays traveling from the negative end to the positive end of an electrode within a vacuum are known as Cathode Rays.A focused beam of electrons is deflected by magnetic or electric fields in cathode ray tubes, in order to produce the image in a traditional television set (CRTs).Ĭathode Rays used to produce images in traditional Television The constituents of cathode rays were the first to be found. When a voltage is given to an evacuated glass tube with two electrodes, electrons emitted from the cathode cause the glass opposite the negative electrode to glow. In vacuum tubes, cathode rays (electron beams or e-beams) are electron streams.When the electron beam hits the phosphor-coated screen, it creates a small, brilliant visible spot on the fluorescent screen. Deflecting coils are of two types: horizontal and vertical.Deflecting coils generate an extremely low-frequency electromagnetic field that allows the electron beam's direction to be adjusted continuously.The electron gun or heater produces a narrow electron beam.CRTs are used in the majority of desktop computer displays.Īs seen in the image, a cathode ray tube is made up of numerous fundamental components:
A cathode ray tube(CRT) is a kind of vacuum tube producing images when an electron beam collides with a phosphorescent surface.
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