Process for producing optical glass

Details Process for producing optical glass Process for producing optical glass

1988-01-26

1989-07-25

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 3013, C03C 2100, C03B 37027

Patent

active

048510246

ABSTRACT:
A uniform refractive index-type glass is prepared by ion exchange in which a glass containing ions of a first type is immersed in a molten salt containing ions of a second type, the ions in the molten salt having a higher refractive index than the ions in the glass. The glass is removed from the molten salt at a predetermined point and before the saturation point or equilibrium and the ion distribution becomes uniform throughout the glass. The concentration of first and second ions is not uniform from the center of the glass to its outer surface. The glass is next heated to make the concentrations of the first and second ions substantially uniform throughout the glass from the center to the outer surface. Optionally, this glass is then immersed in a molten salt containing a third type of ion having a lower refractive index than the second ion for exchange with part of the ions in the second type. A gradient refractive index-type glass in which the concentration of the second type of ions decreases parabolically from the center of the glass to the outer surface while the concentration of the third type of ions increases parabolically from the center of the glass to the outer surface.

REFERENCES:
patent: 3843228 (1974-10-01), Yoshiyagawa et al.
patent: 3880630 (1975-04-01), Izawa
patent: 4455160 (1984-06-01), Rittler

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