Cathode ray tube having specific panel dimensions
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United States of America Patent
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May 22, 2007
Grant Date -
Jun 2, 2005
app pub date -
Sep 13, 2004
filing date -
Nov 27, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a color cathode ray tube and more specifically to a color cathode ray tube in which mechanical stress due to internal pressure made by evacuation is decreased. According to an aspect of the present invention, a 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 generating electron beams; and a deflection yoke which is mounted within the funnel to deflect the electron beams, wherein radius of curvature of outer surface of said panel is in the range of 5000 mm to 100000 mm, and said panel satisfies: 1.0.ltoreq.(OAH*CFT)/USD.ltoreq.1.5 wherein OAH is overall height of said panel measured along defrection axis X, USD is diagonal length of effective screen of said panel and CFT is thickness of center portion of said panel. According to the present invention, a manufacturing cost is decreased by lightness of the cathode ray tube through variation of the panel and the funnel of the cathode ray tube, and the yield is improved by decrease of breakness of the cathode ray tube. Furthermore, by optimization of the structure of the panel and the funnel, the vacuum stress is decreased and the shockproof is improved. Furthermore, a bad effect to human body is prevented by interception of the X-ray.
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