Optical glass
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 7, 2012
Grant Date -
May 21, 2009
app pub date -
Sep 8, 2006
filing date -
Oct 11, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A glass composition that simultaneously has a low temperature coefficient of refractive index and a good light transmittance, being suitable for use in environments of intense temperature change. There is provided an optical glass containing SiO.sub.2, B.sub.2O.sub.3 and La.sub.2O.sub.3, which has a temperature coefficient (20.degree. to 40.degree. C.) of relative refractive index (546.07 nm) of 10.0.times.10.sup.-6 (.degree. C..sup.-1) or below. Further, there is provided an optical glass mentioned above having a temperature coefficient (20.degree. to 40.degree. C.) of relative refractive index (546.07 nm) of 4.6.times.10.sup.-6 (.degree. C..sup.-1) or below. Still further, there is provided an optical glass mentioned above having an internal transmittance (.tau.;10 mm) at 400 nm of 80% or higher.
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