Glass material for molding optical elements

Details Glass material for molding optical elements Glass material for molding optical elements

1995-02-28

1997-04-22

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 60, 501 74, 106 389, C03C 304, B28B 734

Patent

active

056229046

ABSTRACT:
A glass material for molding an optical element and including lead and a lead compound is processed chemically and physically and includes a modificative ion component set such that an atomic concentration of the modificative ion component in a range of 600 angstroms from a glass surface layer has a concentration gradient approximated by a curve represented by the following formula (1). ##EQU1## wherein, reference numeral Y designates an atomic concentration of a modificative ion shown by atomic percent. Reference numeral X designates a depth from an uppermost glass surface layer. Each of coefficients A0 to A10 is set to a constant. Symbol 0 designates a power. Reference numeral e(x) designates an error component.

REFERENCES:
patent: 5141547 (1992-08-01), Asanuma et al.
patent: 5238880 (1993-08-01), Inami et al.
patent: 5244844 (1993-09-01), Inami et al.
patent: 5254148 (1993-10-01), Inami et al.

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