Colour display tube, method of manufacturing such a display...

Details Colour display tube, method of manufacturing such a display... Colour display tube, method of manufacturing such a display...

H - Electricity

01

J

316/12, 313/35.1

H01J 29/07 (2006.01) H01J 9/14 (2006.01)

Patent

CA 1091285

ABSTRACT: By making the bridges in n few rows of apertures situated at the edge of the shadow mask of a colour display tube at least 20 % wider, the mask is not so readily des- troyed during drape drawing. In addition, by keeping the width of the bridges in a row constant and increasing it regularly, preferably substantially linearly per row from a row through the centre of the shadow mask to a row at the edge of the shadow mask, a continuously varying brightness distribution is also obtained. The reproduction mask for the manufacture of such a mask can be obtained in a simple manner by rotating the pattern of bridges between two exposures necessary for printing on photo-sensetive material and combination of the resulting copy with a pattern of stripes.

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