Optical glass
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United States of America Patent
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-
May 6, 2008
Grant Date -
May 19, 2005
app pub date -
Oct 26, 2004
filing date -
Nov 17, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical glass having a refractive index (nd) and Abbe number (.nu.d) within a range enclosed with a border line consisting of straight lines connecting point A (nd being 1.75 and .nu.d being 50.0), point B (nd being 1.80 and .nu.d being 46.0), point C (nd being 1.80 and .nu.d being 50.0) and point D (nd being 1.75 and .nu.d being 56.0) in the order of the point A, the point B, the point C, the point D and the point A in x-y rectangular coordinates in which x coordinate represents Abbe number (.nu.d) and y coordinate represents refractive index (nd), including refractive index (nd) and Abbe number (.nu.d) on the border line except for the straight line connecting the point A with the point D and the straight line connecting the point B with the point C, containing, as essential components, SiO.sub.2, B.sub.2O.sub.3, La.sub.2O.sub.3, Gd.sub.2O.sub.3, Li.sub.2O and F, and being substantially free of As.sub.2O.sub.3.
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