The intensity by which beam of electron moves depends entirely on the electron emitted from the cathode. The control grid is basically a nickel cylinder of aperture 0.5. The emitted electrons further pass through a small hole present in the control grid. In the case of a highly efficient system the value is 300 mA at 6.3 V. To obtain high emission of electrons at a moderate temperature a layer of barium and strontium oxide is deposited at the end of the cathode.Īn indirectly heated cathode requires current and voltage value 600 mA at 6.3 V. The cathode is heated indirectly from which electrons are emitted. It consists of a heater, a cathode, pre-accelerating anode, accelerating anode which emits electrons and forms them into a beam. The electron gun is the originator of focused accelerated electron beam. The main parts of CRT are responsible for the working of it that is explained below- Electron gun The two movements are not dependent on each other that causes the beam to be arranged anywhere on the screen.ĬRT parts are confined in a glass envelope in order to permit free movement of the electron from an end to the other. This applied voltage enable the beam to move vertically up – down and horizontally from an end to other. The two electrostatic deflection plates deflect the accelerated beam by the application of voltage. This high-velocity beam strikes the fluorescent screen thus causing a luminous spot on the screen. The diagram given below shows the internal structure of the CRTĪ sharply focused beam is produced by the electron gun assembly.
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