Combination of display tube and deflection unit comprising line deflection coils of the semi-saddle type with a gun-sided extension
First Claim
1. A display tube comprising an electron gun system, a longitudinal axis, a display screen and an electromagnetic deflection unit, which unit comprises a line deflection coil system having two line deflection coils facing each other, characterized in that each line deflection coil has a gun-sided, lying, lobe and a screen-sided lobe and comprises a first, inner winding sub-assembly and a second, outer winding sub-assembly, each winding sub-assembly comprising two longitudinal conductor groups arranged at both sides of the tube, which groups are connected at their screen side by a connection group crossing in the plane of the screen-sided lobe, the second sub-assembly surrounding the first sub-assembly in such a way that one single, wedge-shaped window with its narrower side at the gun side is formed between the sub-assemblies at the gun side.
1 Assignment
0 Petitions
Accused Products
Abstract
A display tube has an electromagnetic deflection unit with line deflection coils of the semi-saddle type which are provided at their gun-sided ends with an extension having one single, wedge-shaped window directed towards the gun. Particularly line coma errors and raster errors, which occur in display tubes having display screens of small curvature and/or in the case of extreme long axis: short axis ratios, can be minimized with such line deflection coils.
22 Citations
4 Claims
- 1. A display tube comprising an electron gun system, a longitudinal axis, a display screen and an electromagnetic deflection unit, which unit comprises a line deflection coil system having two line deflection coils facing each other, characterized in that each line deflection coil has a gun-sided, lying, lobe and a screen-sided lobe and comprises a first, inner winding sub-assembly and a second, outer winding sub-assembly, each winding sub-assembly comprising two longitudinal conductor groups arranged at both sides of the tube, which groups are connected at their screen side by a connection group crossing in the plane of the screen-sided lobe, the second sub-assembly surrounding the first sub-assembly in such a way that one single, wedge-shaped window with its narrower side at the gun side is formed between the sub-assemblies at the gun side.
Specification