Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1989-08-28
1992-09-15
Jones, W. Gary
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65107, 65110, 264 25, 264 18, 425808, C03B 2300
Patent
active
051474379
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.
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Bruckner John J.
Jones W. Gary
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