Mask assembly for color cathode ray tube
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United States of America Patent
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Oct 12, 2004
Grant Date -
Dec 5, 2002
app pub date -
May 31, 2002
filing date -
May 31, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mask assembly for a color cathode ray tube, has an amount of tension applied to a shadow mask thereof reduced by preventing a main frame for applying tension in the shadow mask from deformation due to creeping during a high temperature process, by regulating the ratios of thickness, width, and height of the main frame to the thickness of the shadow mask. The color cathode ray tube comprises a frame composed of a main frame welded to the shadow mask for supporting the shadow mask toward the panel and a sub-frame supporting said main frame, wherein relations T/t.gtoreq.45, W/t.gtoreq.270, and H/t.gtoreq.270 are satisfied, where t is a thickness of the shadow mask, T is the thickness of part where a main frame is welded to a shadow mask, W is a width of part attached to a sub-frame of a frame, and H is a length of main frame from said shadow mask to the sub-frame.
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