JP2010260740A5 - - Google Patents

Claims (15)

The entire mass of the glass in terms of oxide composition, _P 2 _{O 5} ingredient 40.0% 5.0% or more of the following in mass%, _Nb 2 _{O 5} ingredient containing less 60.0% 10.0% or more The content of the CaO component is 4.70% or less, the content of the BaO component is 20.0% or less, the content of the Sb ₂ O ₃ component is 0.02% or less, and the mass sum Li ₂ An optical glass having O + Na ₂ O + K ₂ O of 15.0% or less and a degree of wear of 100 or more and 400 or less.   The content of the BaO component is 4.5% or less by mass% with respect to the total glass mass of the oxide-converted composition, and the mass sum Li ₂ O + Na ₂ O + K ₂ The optical glass according to claim 1, wherein O is 7.90% or less. 3. The optical glass according to claim 1 , wherein the content of the TiO ₂ component is 30.0% or less by mass% with respect to the total mass of the glass having an oxide equivalent composition. Li ₂ O component 0 to 10.0% and / or Na ₂ O component 0 to 15.0% and / or K ₂ O component 0 to 10.0 by mass% with respect to the total glass mass of the oxide equivalent composition. the optical glass according to any of claims 1-3, further comprising a respective component of less than%. Li ₂ O component, Na ₂ O component, and _{K 2} O ingredients two or more of any description of the optical glass components to claim 1 which contains 4 of. The optical glass according to any one of claims 1 to 5 , wherein the content of the SiO ₂ component is 10.0% or less by mass based on the total mass of the glass having an oxide equivalent composition. The entire mass of the glass in terms of oxide composition, 0 to 5.0% MgO component in% by weight and / or
S rO component from 0 to 10.0%
Any description of the optical glass of claims 1 6 further comprises the components of. The optical glass according to claim 7, wherein the mass sum MgO + CaO + SrO + BaO is 20.0% or less with respect to the total mass of the glass in an oxide equivalent composition. The entire mass of the glass in terms of oxide composition, from 0 to 10.0% _Y 2 _{O 3} component in% by weight and / or _La 2 _{O 3} component from 0 to 10.0% and / or _Gd 2 _{O 3} component 0 10.0%
Any description of the optical glass of claims 1 to 8 containing further components of. 10. The optical glass according to claim 9, wherein the sum of masses Y ₂ O ₃ + La ₂ O ₃ + Gd ₂ O ₃ with respect to the total glass mass of the oxide equivalent composition is 20.0% or less. B ₂ O ₃ component 0 to 10.0% and / or GeO ₂ component 0 to 10.0% and / or Bi ₂ O ₃ component 0 to 20% by mass with respect to the total glass mass of the oxide equivalent composition. 0% and / or ZrO ₂ component 0 to 10.0% and / or ZnO component 0 to 10.0% and / or Al ₂ O ₃ component 0 to 10.0% and / or Ta ₂ O ₅ component 0 to 10 0.0 % and / or WO ₃ component 0-20.0 %
Any description of the optical glass of claims 1 to 10 containing further components of. Has 1.70 to 2.20 the following refractive index (nd), one wherein the optical glass of claims 1 to 11 with 10 to 25 of Abbe number ([nu] d). The optical glass according to any one of claims 1 to 12 , wherein a wavelength (λ ₇₀ ) at which the spectral transmittance is 70% is 500 nm or less. The average linear expansion coefficient (alpha) is 150 × ¹⁰ -7 ^{K -1} or less any description of the optical glass of claims 1 13 in the -30 to + 70 ° C.. An optical element formed of the optical glass according to any of claims 1 to 14.