National Institute of Advanced Industrial Science and Technology

Isuzu Glass Company, Ltd.

Kazuhisa Kimura

Kohei Kadono

Toshihiko Einishi

Tatsuya Suetsugu

Naoto Yamashita

Takashi Tarumi

Tadashi Hasegawa

Takaharu Hosokawa

Naoki Kikuchi

The present invention provides a blue-violet light blocking glass containing copper (I) halide fine particles that satisfactorily transmits light having a wavelength of 450 nm to 600 nm and sharply blocks light having a wavelength shorter than 450 nm. Specifically, the present invention provides a blue-violet light blocking glass containing a copper (I) halide and silver; for example, 20 to 85% by weight of SiO; 2 to 75% by weight of BO; not more than 10% by weight of AlO; 2 to 30% by weight of at least one member selected from the group consisting of LiO, NaO, KO, RbO and CsO; 1 to 15% by weight of at least one member selected from the group consisting of MgO, CaO, SrO, BaO and ZnO; not more than 10% by weight of at least one member selected from the group consisting of PbO, NbO, ZrO, LaO, YO, TaOand GdO; not more than 5% by weight of at least one member selected from the group consisting of SbOand AsO; not more than 5% by weight of SnO; 0.01 to 10% by weight of a copper (I) halide; and 0.001 to 1% by weight of silver calculated on a metal basis.

Blue-violet light blocking glass

The present invention provides a novel glass material that allows the production of a glass product having both excellent chemical durability and high precision by a press molding method. Specifically, the present invention provides a glass for press molding, comprising 38% to 45% by weight of SiO, 18% to 27% by weight of BO, 16% to 25% by weight of AlO, 2% to 12% by weight of ZnO, no more than 3% by weight of MgO, no more than 3% by weight of CaO, no more than 3% by weight of BaO, 13% to 18% by weight of LiO, no more than 3% by weight of KO, and no more than 2% by weight of NaO; wherein the glass has a deformation temperature of 520&#xb0; C. or lower; and the glass has a water resistance of grade 2 or higher as measured according to the Japanese Optical Glass Industrial Standard method for measuring the chemical durability of an optical glass.

Glass for press molding

Growing community of inventors

Osaka, Japan

Kazuhisa Kimura