Koninklijke Philips Corporation N.v.

Leopold Cyrille Maria Beirens

Antonius Henricus Van Tiel

Nicolaas G Vink

Tjerk G Spanjer

Dirk Willem Harberts

Albertus Aemilius Seyno Sluyterman

The invention relates to a color display device comprising an electron gun () for generating three electron beams (), and convergence means () for dynamically influencing the convergence of the electron beams. The convergence means () comprise coils () for generating a magnetic field. The coils () are provided with an electrically conducting layer.

Cathode ray tube with convergence unit

A color display device having an in-line electron gun ( ) for generating three electron beams ( ), and a convergence unit ( &prime;) to dynamically influence the convergence of the electron beams, preferably to decrease a distance (p) between the electron beams. The convergence unit ( &prime;) includes a ring-shaped element ( &prime;) having coils ( &prime;) formed by electrically conductive wires, which have been toroidally wound in a winding direction and according to a winding density distribution N (&phgr;) given by N (&phgr;)&equals;N cos ( &phgr;)&plus;C where &phgr; is an angle enclosed by the X-direction and a line between an element of the coil and the center, which ranges between 0&deg; and 360&deg;, N is a given winding density, the sign of N (&phgr;) denotes the winding direction, and C is a constant different from zero, and preferably equal to &minus;N .

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Eindhoven, Netherlands

Leopold Cyrille Maria Beirens