Method for making an optical device

Details Method for making an optical device Method for making an optical device

1990-04-09

1991-11-05

Lindsay, Robert L.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 33, 156 84, 350167, 428426, 355237, 359620, 359900, C03C 1010

Patent

active

050628771

ABSTRACT:
This invention is directed to a method of forming optical devices composed of a photonucleable, crystallizable, lithium silicate glass body having at least one glass lens integral with and rising above at least one surface thereof, the lens being surrounded by a crystallized glass matrix, and optical devices produced by such method. The inventive method comprises subjecting the crystallized body to an ion exchange reaction wherein sodium and/or potassium ions from an external source are exchanged for lithium ions within the surface of the glass lens, the exchange reaction being conducted at a temperature of about 25.degree.-125.degree. C. above the annealing point of the glass for a time sufficient to produce a lens having an axial height in excess of 100% greater than that of lenses produced solely by selectively crystallizing a photonucleable, lithium silicate glass body.

REFERENCES:
patent: 2628160 (1953-02-01), Stookey
patent: 3674444 (1973-10-01), Simmons
patent: 3749561 (1973-07-01), Kuwayama
patent: 4518222 (1985-05-01), Borelli et al.
patent: 4572611 (1986-02-01), Bellman et al.

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