Heat treating and sagging lens blanks

Details Heat treating and sagging lens blanks Heat treating and sagging lens blanks

1976-05-27

1977-04-12

Kellogg, Arthur D.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65111, 65DIG2, C03B 2302, C03B 3200

Patent

active

040172937

ABSTRACT:
A method of heat treating a plurality of geometrically congruent and flat lens blanks made from a phototropic glass, such heat treating being performed for development of the phototropic properties thereof. A plurality of lens blanks are formed into a stack by alternately positioning and clamping similar areas between the flat surfaces of two flat, annular, spacer members. The stack is then rotated about the longitudinal axis oriented in a substantially horizontal position while evenly heating the lens blanks to the phototropic development temperature of the glass. The stack of blanks is then vertically positioned while continuing the heating thereof and part of each of the blanks sags into the hollow of the spacer member therebelow to form such part of each blank into a curved configuration for an eyeglass lens.

REFERENCES:
patent: 2377946 (1945-06-01), Leary
patent: 2821812 (1958-02-01), Vermas et al.

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