电子原理（国外英文资料）.docVIP

电子原理（国外英文资料） Electron gun is by filament (H, HT, or F) and cathode (expressed in K, color of color kinescope has three cathode, respectively with fairly RK, GK, BK), grid (G1), acceleration (G2), high voltage anode (use G. V). Its a component that emits beams of electrons. The main effect of forming an electronic gun is as follows: 1) filament: electricity is converted into heat and heated to the cathode, which makes the surface of the cathode 600-800. The heat of C creates an external condition that causes the cathode to emit electrons. 2) the effect of cathode, cathode cylinder, filament inside the cylinder, the top coated with barium strontium calcium oxide, filament current, cathode heated launch a large number of electrons. 3) grid: the grid is a metal cylinder with a small hole in the top of the cathode, allowing the electron beam to pass through. Change the relative potential of the cathode to control the strength of the electron beam. If add the video signal to the cathode or grid, so, the strength of the beam will be as the video video signal intensity change, appear on the screen with the video signal corresponding to the image. Figure 8-6 shows the modulation property of a grid cathode potential (UGK). In practice, in order to improve the signal to the cathode tube, and the grid with negative pressure ￣ 0 v, 60 potentiometer (or computer), is used to adjust the voltage to modulation by the number of electrons, change the size of the tube bundle of current, so as to control the brightness of the screen. 4) the accelerating effect: it is also a metal tube with a small hole in the top, which is positioned close to the grid. Usually with several hundred volts on accelerometers are voltage, it can control the cathode emission electron beam of A green to A 2008-12-18 12:54:52 58.39.113. * gun is made up of A filament (with H, HT, or F) and cathode (expressed in K, color of color kinescope has three cathode, respectively with fairly RK, GK, BK), grid (G1), accel