Glass funnel for cathode ray tube, and cathode ray tube
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United States of America Patent
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Aug 15, 2006
Issued Date -
N/A
app pub date -
Sep 7, 2004
filing date -
Mar 5, 2002
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Expired
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Abstract
A glass funnel suitable for a chemical strengthening method of an electric field application type without impairing the safety of a cathode ray tube. A glass funnel for a cathode ray tube, characterized in that glass at a body portion 3 contains at least Na.sub.2O and K.sub.2O, the conductivity of said glass at the strain point is at least 4.times.10.sup.-6 S/cm, the conductivity at 150.degree. C. is at most 5.times.10.sup.-12 S/cm, and a compressive stress layer is formed by a chemical strengthening method on at least part of the outer surface of the body portion 3.
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