Patent ID: 7351675
Filing Date: 2008-04-01
Classification: C03B,C03C,Y02P,Y10S

Abstract:
1. An optical glass having a refractive index (nd) of at least 1.57 but less than 1.67 and an Abbe's number (νd) of over 55 but not more than 65, the optical glass containing by mol %, 25 to 50% of B 15 to 40% of SiO over 0% but not more than 5% of La over 0% but not more than 5% of Gd 2 to 20% of Li 0 to 10% of Na 0 to 5% of K over 0% but not more than 15% of BaO, and an alkaline earth metal oxide as essential components, and 1 to 12% by mol of SrO, having a B