Near-infrared light absorbing glass, element and filter
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United States of America Patent
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Jan 17, 2017
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Nov 19, 2015
app pub date -
Feb 4, 2013
filing date -
Feb 17, 2012
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Abstract
Provided is a near-infrared light absorbing glass with a near-infrared light absorbing element and a near-infrared light absorbing filter. When the length of the near-infrared light absorbing glass is 1 mm, transmissivity is more than 80% at the wavelength of 400 nm, and more than 85% at the wavelength of 500 nm. The near-infrared light absorbing glass contains P5+, Al3+, Li+, R2+ and Cu2+ represented by positive ions, wherein R2+ represents Mg2+, Ca2+, Sr2+ and Ba2+. Meanwhile, the near-infrared light absorbing glass contains O2− and F− represented by negative ions. Water durability (DW) of the near-infrared light absorbing glass reaches Class 1 and acid durability (DA) reaches above Class 4. In this invention, fluorphosphate glass is used as the matrix glass and the components are designed specially, so that the melting temperature of glass can be effectively lowered and the chemical stability of the glass can be excellent.
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