Colour cathode ray tubes
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United States of America Patent
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Issued Date -
May 11, 2006
app pub date -
Aug 7, 2003
filing date -
Aug 13, 2002
priority date (Note) -
Abandoned
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Abstract
The invention concerns cathode ray tubes with substantially planar front surface, whereof the colour selecting mask is produced by swaging. The mask comprises an active surface enclosed by a solid peripheral edge terminated by a skirt substantially perpendicular to the active surface. In order to rigidify the active surface in a direction parallel to the main axis, the mean radius of curvature of said active surface is greater than the mean radius of curvature of the peripheral edge.
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