JP2014231470A5 - - Google Patents

Claims (10)

Containing A ^{l 3+} and Mg ^{2 +} as a cationic component,
15.0-55.0% of P ⁵⁺ and
Ba ²⁺ is 0.1 to 50.0%.
Contains,
An optical glass containing O ²⁻ and F ⁻ as an anionic component, having a refractive index (nd) of 1.50 or more and a thermal conductivity of 0.50 W / (m · K) or more. In cation% (mol%) display ,
5.0 to 30.0 percent of the A l ³⁺ and,
0.1 % to 30.0 % Mg ²⁺
The optical glass of claim 1 having free. The ratio of the total amount of Ca ²⁺ content and Sr ²⁺ content to the total of Mg ²⁺ content and Ba ²⁺ content (Ca ²⁺ + Sr ²⁺ ) / (Mg ²⁺ + Ba ²⁺ ) in terms of cation% (mol%) The optical glass according to claim 1 or 2, which is more than 0 and 3.00 or less. The optical glass according to any one of claims 1 to 3, wherein the content of Gd ³⁺ is less than 10.0% in terms of cation% (mol%). The optical glass according to claim 1, wherein the content of Li ⁺ is 10.0% or less in terms of cation% (mol%). Anionic% (molar%) display, F ^- a 20.0 to 70.0% containing billing or wherein the optical glass of items 1 5.   The optical glass according to claim 1, having an Abbe number (νd) of 60 or more.   The optical glass according to any one of claims 1 to 7, wherein the glass transition point (Tg) is 600 ° C or lower and the yield point (At) is 700 ° C or lower.   An optical element made of the optical glass according to claim 1.   A preform for polishing and / or precision press molding comprising the optical glass according to claim 1.