Multifocal lens method

Details Multifocal lens method Multifocal lens method

1990-02-20

1991-02-12

Lindsay, Robert L.

Glass manufacturing

Processes

Fusion bonding of glass to a formed part

65 61, C03B 1108

Patent

active

049920863

ABSTRACT:
There is disclosed a method of producing a multifocal, ophthalmic lens blank wherein a glass major element is formed that has a raised countersink zone on one surface, the remainder of the glass major element being thinner than the countersink zone, but of such thickness that it can be ground and polished to form a lens, a countersink is formed in the countersink zone, a segment element is formed and is fused in the countersink to form a lens blank assembly.

REFERENCES:
patent: 901576 (1908-10-01), Wilhelm
patent: 2936674 (1960-05-01), Beasley
patent: 4842632 (1989-06-01), Buckley

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