GLASS FOR IR-CUT FILTER
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United States of America Patent
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Mar 24, 2016
app pub date -
Jun 16, 2014
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Jul 5, 2013
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Abstract
Provided is a glass for an IR-cut filter that has high weather resistance even without fluorine component, a high glass transition point, and excellent polishing workability. The glass for an IR-cut filter contains, in % by mole, 1% or more SO3, 10 to 50% P2O5, 1 to 15% CuO, 0.1 to 10% Al2O2, 5 to 50% RO (where R is at least one selected from among Zn, Ca, Sr, and Ba), and 0 to 30% R′2O (where R′ is at least one selected from among Na, Li, and K) and is substantially free of fluorine component.
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