Aluminophosphate glass containing copper (II) oxide and uses thereof for light filtering
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United States of America Patent
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Issued Date -
May 3, 2007
app pub date -
Apr 21, 2006
filing date -
Apr 22, 2005
priority date (Note) -
Abandoned
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Abstract
Aluminophosphate glasses containing copper(II) oxide having a low transmission in the near infrared range with a steep absorption edge, as well as a very uniform high transparency in the visible range and excellent chemical durability under conditions of exposure to elevated temperature and high relative humidity, are particularly suitable as filter glasses for use in CCD and CMOS camera and detector applications and as filter glass, e.g., for goggles and color displays. The glass comprising, in % by weight on an oxide basis: 65-80 of P.sub.2O.sub.5; 4-20 of Al.sub.2O.sub.3; 0-<5.5 of B.sub.2O.sub.3, 0-2.1 of La.sub.2O.sub.3; 0-2.1 of Y.sub.2O.sub.3, 0-3 of SiO.sub.2; >2-12.5 of Li.sub.2O; 0-6 of Na.sub.2O; 0-4 of K.sub.2O; 0-2.5 of Rb.sub.2O; 0-2.5 of Cs.sub.2O; 0-7.9 of MgO; 0-5 of CaO; 0-5 of SrO; 0-10 of BaO; 0-8 of ZnO; 0-5 ZrO.sub.2, 5-15 of CuO; and 0-0.5 of V.sub.2O.sub.5, wherein the sum of alkaline-earth metal oxides+ZnO (.SIGMA.R'O) is <18; and the sum of CuO+V.sub.2O.sub.5 is 5-15.
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