Optical glass
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United States of America Patent
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Issued Date -
Apr 7, 2005
app pub date -
Jul 21, 2004
filing date -
Jan 28, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to optical glasses that are composed as follows: 5-35% by weight of SiO.sub.2, 55-88% by weight of PbO; 0-10% by weight of B.sub.2O.sub.3; 0-5% by weight of Na.sub.2O, 0-5% by weight of K.sub.2O; 0-10% by weight of TiO.sub.2, 0-10% by weight of ZrO.sub.2; 0-10% by weight of La.sub.2O.sub.3; 0-10% by weight of BaO; 0-10% by weight of ZnO, with the proviso that S(Na.sub.2O; K.sub.2O): 0=x=8 and S(TiO.sub.2; ZrO.sub.2; La.sub.2O.sub.3; ZnO; BaO): x=15. The glasses are particularly suitable for LCD projection purposes, especially rLCD projectors. The inventive glasses are glasses from the heavy flint-glass and lanthane heavy flint glass type and have a stress-optical coefficient approaching zero while having a good chemical resistance and sufficient Knoop hardness and are characterized by excellent melting and workability properties. They are therefore suitable for use in fields of application that benefit from low stress-optical effects.
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