Browse Prior Art Database

Correction of Misconvergence in In Line Gun Cathode Ray Tubes

IP.com Disclosure Number: IPCOM000052797D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Chase, BD: AUTHOR [+2]

Abstract

This article describes two approaches to the problem of misconvergence in in-line gun cathode ray tubes.

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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.

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