Deflection unit for a cathode-ray tube
AssigneeInternational Standard Electric Corporation
InventorFriedrich Nelle
Life of this patent
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Abstract
In cathode-ray tubes which require a precise specific electromagnetic deflection field configuration as for example, in self-converging color television picture tubes, an accurate distribution of the coil windings has to be maintained on the inside of the deflection unit. In practice, this requirement has been met with the aid of toroidal coil windings, but with respect to the more sensitive saddle-type coils this problem has not yet been solved satisfactorily, especially when large numbers of winding turns are to be accommodated. With respect to saddle-type coils the invention proposes to solve this problem by placing the windings into grooves.
Claims5
A deflection unit for a cathode-ray tube, which is arranged toroidally around the neck of the tube and opens up in a trumpet-like manner towards the screen, and produces an electromagnetic field for deflecting one or more electron beams, and in which, at least in one direction of displacement, the deflecting field is produced by a set of saddle-type coils, the windings of which are wound on to a coil form on the face sides and on the inner surface of the deflection unit, wherein the improvement comprises;
- each of the two halves of the saddle-type coil is arranged on one half of a coil form comprising two parts, with grooves determining the exact coil winding distribution being provided for in the surface of the coil form facing the tube wall;
- the groove cross-sections are so designed that said grooves are almost completely filled with wires;
- and
- at least some of said grooves deviate in their direction from the planes of the tube axis.
Dependencies are inferred from the claim text.