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关於偏转磁芯ABOUT DEFLECTION YOKE - HKEXnews
ABOUT DEFLECTION YOKE
To make a beam of electrons functional, it has to be deflected from its course
in some manner so as to make a trace or scan across the cathode ray tube
(“CRT”)’s faceplate. There are two methods used to do this: with an
electrostatic charge and an electro-magnetic field.
Electrostatic deflection uses pairs of charged plates in the neck of the CRT to
repel and attract the beam of electrons. The negatively charged plates repel
the electrons, as in the negatively charged control grid, and the positively
charged plates attract the beam, as does the positively charged anode. The
beam passes between the pairs of oppositely charged plates and, as their
polarity and the strength of their charge is altered, is deflected from side to
side. With one pair of plates mounted vertically and the other horizontally,
the beam can be deflected towards any part of the screen.
Although electrostatic deflection is extremely fast and, consequently, ideal
for CRTs used in oscilloscopes, at the energy levels of the electron beams
used in TV and monitor CRTs it has insufficient
influence on the beam to be useful. In these CRTs,
electro-magnets take the place of the charged plates,
creating two magnetic fields at right-angles to each
other to control the beam’s deflection. These electro-
magnets are usually mounted outside the CRT, at the
point where the neck meets the funnel, and consist of a
series of windings moulded to fit the glass of the tube.
The part that is attached to the funnel cone region and acts
as a deflector is called a deflection yoke.
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