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CRT accelerating voltage, but in electrostatic deflection, the angle is inversely proportional to the accelerating voltage (for a particular value of deflection plate voltage). This has the practical effect that high accelerating voltages can be used without greatly increasing the power of the deflection amplifiers.
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image, the high inductance of the yoke windings requires powerful amplifiers that may be expensive to produce with high bandwidth. In a raster scan display used for television or computer displays, the energy stored in the deflection system is recovered and used to develop the high voltage (10,000
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Additionally, magnetic deflection can be arranged to give a larger angle of deflection than electrostatic plates; this makes the CRT and resulting television receiver more compact. The angle of magnetic deflection, for a given deflection current, is inversely proportional to the square root of the
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The deflection yoke has two sets of coils, perpendicular to each other and to the neck of the cathode ray tube. The coils are bent into a rough saddle-shape, to conform to the neck of the CRT and to provide a linear magnetic field distribution. In a color television receiver, three electron beams
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of a deflection yoke. Compared with electrostatic deflection, magnetic deflection has fewer obstructions inside the tube and so allows for a larger-diameter electron beam, producing a brighter image. This is an advantage for a raster-scan display, which must cover the whole screen instead of one
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on the screen. By adjusting the strength of the beam current, the brightness of the light produced by the phosphor on the screen can be varied. The cathode ray tube allowed the development of all-electronic television.
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Another way of deflecting an electron beam is to put two pairs of electrodes inside the CRT, after the electron gun structure.
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are all scanned in unison by the single deflection yoke. In a television receiver, the deflection coil may include
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displays, because it is easier to drive deflection plates at high frequencies, compared to driving the large
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Cathode ray tube, showing the yoke (copper coils and white plastic former) around the rear neck of the tube
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Electromagnetic deflection yokes are also used in certain radar displays.
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While a magnetic deflection yoke can be used to provide a random-access
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Part of a cathode ray tube which moves the electron beam around
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volts or more) used to generate the electron beam in the CRT.
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segments to help direct and concentrate the magnetic field.
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both vertically and horizontally over the whole screen.
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Dismounted deflection yoke coil of a black and white TV
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In a CRT television, the electron beam is moved in a
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60:Magnetic compared to electrostatic deflection
181:Analog television § Displaying an image
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77:narrow trace as in an oscilloscope.
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122:From front (screen) side of TV.
219:Electronic Engineer's Handbook
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229:, pages 11–40 through 11–44
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171:Electron beam processing
66:Electrostatic deflection
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256:Television technology
251:Electromagnetic coils
221:, McGraw Hill, 1975,
217:Donald G. Fink (ed),
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166:Magnetic deflection
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176:Analog television
161:Quadrupole magnet
39:cathode ray tubes
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246:Cathode ray tube
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191:Image dissector
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31:deflection yoke
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68:is common in
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43:electron beam
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35:magnetic lens
33:is a kind of
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70:oscilloscope
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41:to scan the
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186:Nipkow disk
50:raster scan
240:Categories
202:References
146:from back.
134:Side view.
74:inductance
37:, used in
196:Scan line
93:Structure
155:See also
100:ferrite
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223:ISBN
242::
210:^
29:A
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