National Institute of Advanced Industrial Science and Technology

Nihon Yamamura Glass Co., Ltd.

Junichi Nakamura

Junji Nishii

Hidekazu Hashima

Naoyuki Kitamura

Tatsuo Hidaka

Kohei Fukumi

Yoshitaka Mayumi

Takuro Ikeda

A PO&#x2014;BaO&#x2014;ZnO&#x2014;NbOtype optical glass contains 25-50 wt. % PO, 15-35 wt. % BaO, 1-25 wt. ZnO, and 3-10 wt. % NbO. The optical glass has a high refractive index (particularly preferably the refractive index nof 1.6 or more), low dispersion (an Abbe number &#x3c5;of 42 or more), a low deformation point, and improved resistance to devitrification upon molding, and is suitable for precision-mold press molding or other molding processes and also suitable for transfer of a fine structure.

Optical glass

An optical glass having a high refractive index (particularly preferably a refractive index of 1.6 or more), low dispersion (an Abbe number of 45 or more), a low deformation point, and improved resistance to devitrification upon molding, and suitable for precision-mold press molding or other molding processes and also suitable for transfer of a fine structure is provided. The optical glass contains 1.0-4.5 wt. % SiO, 30.5-50.0 wt. % BO, 1.1-8.0 wt. % LiO, 10.1-19.5 wt. % BaO, 15.5-30.0 wt. % ZnO, 3.0-15.0 wt. % YO, and 10.0-19.5 wt. % LaO.

Growing community of inventors

Hyogo, Japan

Junichi Nakamura