U.S. Philips Corporation

Bernardus H Dekkers

Jacobus H Jamar

Hendrik Dirk Van Den Berg

Albertus A Sluyterman

Ronald Van Der Wilk

Johannes Penninga

Ronald J De Man

Display tube including a convergence correction device which comprises a plurality of correction coils having coplanar axes and being arranged around the tube neck. The coils are of the planar type. More specifically, there are two sets of four coils for generating two differently oriented four-pole fields and two sets of six coils for generating two differently oriented six-pole fields, while all these coils are arranged on one flexible support which is wound around the tube neck a number of times, for example, one set of coils for each turn.

Display tube including a convergence correction device

A deflection unit comprising a set of preformed diametrical deflection coils. A hollow coil support of synethic material includes at least two lugs into which respective permanent deformations are impressed. The coils are mechanically anchored to the lugs by means of, for example, an ultrasonic welding process in which the locations of the coil support situated opposite supported locations of the coils are softened and pressed into the coils. The coils substantially free of the coil support, i.e., the larger part of each coil is free of the coil support, and are not deformed so that their mutual position is accurately maintained.

High accuracy CRT deflection unit

Method of manufacturing a deflection unit comprising a set of diametrical deflection coils, in which method the coils are placed on a jig which supports each coil at a plurality of locations and in which a coil support of synethic material is urged against the free surface of each coil. The coils are mechanically anchored by means of, for example an ultrasonic welding process in which the locations of the coil support situated opposite supported locations of the coils are softened and pressed into the coils. The coils are not deformed in that case and their mutual position defined by the jig is accurately maintained.

Method of manufacturing a deflection unit

Deflection unit mounted around a display tube for deflecting electron beams across the display screen includes a line deflection coil and a field deflection coil. A compensation coil system for generating a magnetic compensation field oppositely directed to the line frequency radiation field in a space in front of the display screen includes core means of a magnetizable material positioned between the display screen and the deflection unit in a plane parallel to the display screen and two diametrically arranged coils each having at least one turn.

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Eindhoven, Netherlands

Bernardus H Dekkers