Cathode ray tube with astigmatic beam cross-over induced by...

Details Cathode ray tube with astigmatic beam cross-over induced by... Cathode ray tube with astigmatic beam cross-over induced by...

H - Electricity

01

J

313/35.33

H01J 29/68 (2006.01) H01J 29/56 (2006.01)

Patent

CA 1144973

ABSTRACT: By providing, in an electron gun in a cathode-ray tube, a non-rotationally symmetrical permanent magnetic lens against the control grid before the cross-over, an astigmatic cross-over is induced. As a result of this a spot is obtained on the display screen of the tube which shows only a small haze surrounding the spot and which has dimen- sions which do not vary considerably with potential variations at the control grid.

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