Importance

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Abstract

A fluorophosphate glass containing: P⁵⁺ in an amount of 20 to 45 cationic %; Al³⁺ in an amount of 15 to 35 cationic %; Ba²⁺ in an amount of 20 to 50 cationic %; B³⁺ in an amount of 0 to 5 cationic %; F⁻ in an amount of 20 to 50 anionic %; and O²⁻ in an amount of 50 to 80 anionic %. A molar ratio of O²⁻/P⁵⁺ is greater than or equal to 3.5. In addition, a molar ratio of Al³⁺/P⁵⁺ is less than or equal to 1. In addition, the Abrasion FA is less than or equal to 600, or the Knoop hardness number is greater than or equal to 300 MPa. Furthermore, the Abbe number (νd) of the glass is larger than or equal to 66. Moreover, a refractive index (nd) of the glass satisfies an expression (1): nd≧2.0614−0.0071×νd. Finally, the fluorophosphate glass does not contain Cu in an amount by which Cu serves as a coloring agent.

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First Claim