Color cathode ray tube
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United States of America Patent
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-
Apr 3, 2007
Grant Date -
Mar 17, 2005
app pub date -
May 28, 2004
filing date -
Sep 17, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a color cathode ray tube in which beam landing errors caused by non-uniform thermal expansion of a shadow mask are corrected such that color purity is improved. In one aspect of the present invention, a color cathode ray tube comprises a panel on inner surface of which a phosphor screen is formed; a funnel joined to the panel; an electron gun; a shadow mask mounted to the panel, the shadow mask having a faceplate portion and a peripheral skirt portion bent back from the faceplate portion; and a frame joined to said shadow mask; wherein radius of curvature of at least a corner of the faceplate portion of said shadow mask is not smaller than 50 mm, and gap is provided between a corner of the faceplate portion of said shadow mask and a corresponding corner of said frame.
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