摘要 |
PROBLEM TO BE SOLVED: To provide glass capable of being used for various optical members such as various prisms, various lenses, a light pick-up lens, and a lens of eye glasses, etc., and for various optical substrates such as reflective plates, diffusion plates, polarizing plates, a cover glass, etc. SOLUTION: This glass has optical constants in the range of not lower than 1.79 refractive index (nd) and not lower than 27 Abbe number (νd), and has a specific gravity (D) of not lower than 3.20, and causes no devitrification in the interior of the glass in the reheating test. This glass has a rating of class 1 of the chemical durability (powder method acid resistance: RA) by the powder method. COPYRIGHT: (C)2006,JPO&NCIPI
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