Importance

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Abstract

Method and device for providing a layer (6) of a coating material on the inner side (2) of a display window (1) for a color display tube. A drop (3) of a suspension of said coating material is deposited on the inner side of the display window, its axis of symmetry (4) being oriented vertically. Then the display window is rotated around said axis of symmetry, and at the same time, said axis is tilted to a horizontal position. The suspension is thereby distributed on the inner side of the display window. An excess of suspension is collected during the rotation in four collection cups (8) arranged at the corners (7) of the display window, whence it is drained off to a central collection cup (10). Finally, the part of the suspension which remains on the display window is dried by infrared radiation (9). As the suspension is drained from the four collection cups to the central collection cup during the rotation, there is no risk that the suspension may drip from the cups onto the display window. Thus, the rotation can be carried out at such a low velocity that layers having a very homogeneous thickness can be formed.

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First Claim