Self converging wide screen color picture tube system

Details Self converging wide screen color picture tube system Self converging wide screen color picture tube system

H - Electricity

01

J

H01J 29/76 (2006.01)

Patent

CA 2081200

A self converging, widescreen color picture tube system includes a widescreen, in-line color picture tube having a funnel, an electron gun assembly (28) for three in-line electron beams located in a neck at one end of the picture tube, and a faceplate with a viewing screen at the other end. The picture tube has a wide aspect ratio. A self converging widescreen deflection yoke (40) for deflecting the electron beams in the wide aspect ratio picture tube includes horizontal and vertical deflection windings. The yoke (40) is located by an initial flare section of the funnel and positioned along the longitudinal axis of the picture tube to make the tube reference line and the yoke deflection plane substantially coincident. To achieve substantial horizontal astigmatism cor- rection at the extremes of the major axis of the wide viewing screen, the horizontal deflection winding is constructed to have a generally pincushion-shaped horizontal deflection field over the effective length of the field. The field is modified from that re- quired of the horizontal deflection field in a comparable self converging narrowscreen yoke. The modification is made in accord- ance with the differences in centerscreen slope angles and S-spacing.

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