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This article describes two approaches to the problem of misconvergence in in-line gun cathode ray tubes.
English (United States)
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100% of the total text.
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Correction of Misconvergence in In Line Gun Cathode Ray Tubes
This article describes two approaches to the problem of misconvergence in
in-line gun cathode ray tubes.
Fig. 1 shows a cross-section of the neck of a tube with three in-line guns 1,
2, 3. Convergence correction currents are applied to the beams from guns 1 and
3 by way of the E-coils 4 and 5. Permalloy pole pieces 6 and 7 act as flux paths
from the E-coils to the beams 1 and 3 and also prevent stray flux from affecting
center beam 2.
Fig. 2 shows a further refinement of the use of E-coils to apply convergence
correction current to the outer beams. A permalloy tube 8 shields the center
beam from the effects of stray flux.
Page 2 of 2
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