Patent ID: 7638449
Filing Date: 2009-12-29
Classification: C03C,G02B

Abstract:
1. An optical glass comprising, by mass %: 30 to 40% of B 2.5 to 6% of Li 10 to 17% of ZnO; 12 to 22% of La 15 to 25% of Gd 0 to 5% of SiO 0 to 5% of Bi 0 to 15% of Al 0 to 3% of ZrO 0 to 5% of WO 0 to 5% of Ta 0 to 3% of TiO 0 to 5% of Y 0 to 5% of MgO+CaO+SrO+BaO, wherein an average linear thermal expansion coefficient (α) from 50 to 350° C. is 85×10