Method of forming multifocal lens blank

Details Method of forming multifocal lens blank Method of forming multifocal lens blank

1982-04-26

1983-12-06

Fisher, Richard V.

Glass manufacturing

Processes

Fusion bonding of glass to a formed part

65 41, 65 48, 65 55, C03B 1108, C03B 2322, C03B 700

Patent

active

044191197

ABSTRACT:
A method of producing multifocal lens blanks by fusing a molten glass segment into a pressed countersink of a lens blank when it is being formed in which the pressed countersink is unpolished and into which unpolished and pressed countersink a minor element of a molten glass is fused to form a fused multifocal lens blank and in which the major lens blank has one refractive index and the minor element filling and fused to the convex major lens blank in the pressed, unpolished countersink therein may have a higher refractive index with the countersink being selectively spaced from the lens blank periphery.

REFERENCES:
patent: 901576 (1908-10-01), Wilhelm
patent: 1026182 (1912-05-01), Seymour
patent: 1165978 (1915-12-01), Kinnear
patent: 1560168 (1925-11-01), Laabs
patent: 2734315 (1956-02-01), Poundstone
patent: 3130029 (1964-04-01), Cala

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