Optical glass
AssigneeKabushiki Kaisha Ohara
InventorsKoji Shimizu, Susumu Uehara
Life of this patent
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Abstract
An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (νd) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C. and an mean coefficient of linear thermal expansion (α) within a range from 80×10−7° C.−1 to 103×10−7° C.−1, comprising SiO2, TiO2, Nb2O5 and Li2O and being substantially free of a Pb compound.
Claims6
An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (νd) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C. and a mean coefficient of linear thermal expansion (α) within a range from 80×10−7° C.−1 to 103×10−7° C.−1, comprising SiO2, TiO2, Nb2O5 and Li2O and being substantially free of a Pb compound.
An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (νd) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C. and a mean coefficient of linear thermal expansion (a) within a range from 80×10−7° C.−1 to 100×10−7° C.−1, comprising SiO2, TiO2, Nb2O5 and Li2O and being substantially free of a Pb compound
An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (νd) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C. and a value of the formula −1:E·α/(1−ν) (where E represents Young's modulus, α is the mean coefficient of linear thermal expansion and ν is Poisson's ratio) within a range from 1.00×106 Pa·° C.−1 to 1.35×106 Pa·° C.−1, comprising SiO2, TiO2, Nb2O5 and Li2O and being substantially free of a Pb compound.
An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (νd) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C., a mean coefficient of linear thermal expansion (α) within a range from 80×10−7° C.−1 to 103×10−7° C.−1 and a value of the formula −1:E·α/(1−ν) within a range from 1.00×106 Pa·° C.−1 to 1.35×106 Pa·° C.−1, and being substantially free of a Pb compound.
An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (ν) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C., a mean coefficient of linear thermal expansion (α) within a range from 80×10−7° C.−1 to 100×10−7° C.−1 and a value of the formula −1:E·α/(1−ν) (where E represents Young's modulus, a mean coefficient of linear thermal expansion and ν Poisson's ratio) within a range from 1.00×106 Pa·° C.−1 to 1.35×106 Pa·° C.−1, and being substantially free of a Pb compound.
6-55. (canceled)
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