| 摘要 |
<p>An optical Glass characterized by comprising, denoted as molar percentages:
B 2 O 3 5 to 45 percent;
Li 2 O 0 to 3 percent;
ZnO 10 to 40 percent;
La 2 O 3 5 to 30 percent;
Gd 2 O 3 0 to 20 percent; and
at least one from among TiO 2 , Nb 2 O 5 , WO 3 , and Bi 2 O 3 ; in that the total content X of Ti, Nb, W, and Bi, denoted as a cation percentage, is 3 to 35 percent; in that the Abbé number v(nu)d and refractive index nd fall within the range delimited by sequentially connecting with straight lines points A, B, C, D and A in Fig. 1 ; and in that the glass transition temperature Tg satisfies relation (1) below: Tg °C ‰¤ 655 �¢ °C - 5 x X
An optical Glass characterized by comprising, denoted as molar percentages:
B 2 O 5 5 to 45 percent;
SiO 2 0 to 6 percent (excluding 6 percent);
Li 2 O, Na 2 O, K 2 O in total 0 to 3 percent;
ZnO 10 to 40 percent;
La 2 O 3 5 to 30 percent;
Gd 2 O 3 0 to 20 percent; and
ZrO 2 , TaO 2 , TiO 2 , Nb 2 O 5 , WO 3 , and Bi 2 O 3 in total 12.5 to 20 percent;
in that the cation ratio of the Ti 4+ content relative to the total content of Zr 4+ , Ta 5+ , Ti 4+ , Nb 5+ , W 6+ , and Bi 3+ is 0.30 or lower; in that the temperature Tp at which a viscosity of 10 7.2 dPa·s is exhibited is 706°C or lower; and in that the refractive index nd and the Abbé number v(nu)d satisfy all of relations (I) to (IV) below. 34.0 ‰¤ vd < 40 nd ‰¥ 1.87 nd ‰¥ 2.23 - 0.01 x vd nd ‰¤ 2.28 - 0.01 x vd</p> |
