Optical Glass for Precision Press Molding, Glass Preform, Optical Element and Optical instrument

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The shape of enveloping surface by the high refractive index in the present invention precise improved made therefrom and optical glass mold for compression molding a preform, provides optical device and optical component. Precision mold for compression molding configuration of a weight optical glass powder expense SiO 2 is 1-10%, B 2 O 3 is 10-25%, La 2 O 3 is 15-35%, Gd 2 O 3 is 10-35%, ZnO is 1-20%, LaF 3, GdF 3, YF 3 at least one, 1.75-1.82 refractive index, Abbe (Abbe) is 45-52 can. The present invention refers to rare earth element which engages with a manner F - by introducing a glass predetermined thickness is in the shape of enveloping surface by and with respect equalization Li 2 O, ZnO, F - to rationalize the glass anhydrous rate stability of quality glass transition temperature and. glass pressing to by lowering the brightness of the lamps.