Invisible flat-top mold blank and method for manufacturing same

Details Invisible flat-top mold blank and method for manufacturing same Invisible flat-top mold blank and method for manufacturing same

1988-07-25

1989-11-28

Kellogg, Arthur

Glass manufacturing

Processes

Fusion bonding of glass to a formed part

65 39, 65 44, 65102, 65107, C03B 2300

Patent

active

048835242

ABSTRACT:
A mold blank for manufacturing eyeglass lenses containing a flat top bifocal segment. A ceramic platform is first constructed containing an optical surface having a recess corresponding to the flat top bifocal segment. A concave-convex glass mold blank polished on both sides is placed on the optical surface and across the recess of the platform and the mold blank together with the platform is placed in a furnace. The furnace is then heated to a preselected temperature at which the mold blank thermally deforms and sags against the optical surface and into the recess. Upon cooling the mold blank can be used to mold plastic eyeglass lenses. A method for making the mold blank is also disclosed.

REFERENCES:
patent: 901659 (1908-10-01), Stevens
patent: 2006638 (1935-07-01), Hammon
patent: 2216182 (1940-10-01), Boeder et al.
patent: 2388687 (1945-11-01), Hammon
patent: 2685821 (1954-08-01), Tillyer et al.
patent: 3681043 (1972-08-01), Bognar
patent: 4349374 (1982-09-01), Rupp

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