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US 2001/0033131 A1Published application
Color display tube
OwnerJacobus Hubertus Theodoor Jamar, Albertus Aemilius Seyno Sluytermaninventors
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OwnerJacobus Hubertus Theodoor Jamar, Albertus Aemilius Seyno Sluytermaninventors
Estimating the term…
The color display tube (1) has a display window (3) and a curved shadow mask (13). The inner surface (15) of the display window (3) may be substantially flat or it may be curved with a curvature smaller than the curvature of the shadow mask (13). The distance Qp from the shadow mask (13) to the screen (6) at the inner surface (15) of the display window (3) of the color display tube (1) according to the invention is larger by a positive integer, not being a multiple of three, for all positions p on the screen (6) than this distance Q0p in prior art tubes. As a result, the mask has a stronger curvature than for prior art tubes. This has for its effect an increased stability of the shape of the shadow mask (13), thereby avoiding the deterioration of the performance of the color display tube (1) compared to important parameters such as color purity—due to doming—and microphony.
A color display tube (1) comprising a display window (3) having an inner side (15) which is provided with a screen (6), a curved shadow mask (13) with a pattern of apertures (22) and positioned at a distance from the screen (6), and an electron gun (10) generating, in operation, three electron beams (7, 8, 9) in a plane (27), which are deflected by a deflection device (11) having a deflection plane (21) to scan all positions on the screen (6), characterized in that the distance between the shadow mask (13) and the screen (6) for each position p on the screen (6), denoted by Qp, is given to be approximately
Dependencies are inferred from the claim text.