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US 5,271,875 AGranted
Method for molding lenses
AssigneeBausch & Lomb Incorporated
InventorsWilliam J. Appleton, Dennis Hahn, William E. Moucha, Dominic V. Ruscio, John H. Shannon, Steven D. Silbermann, Edwin W. Weaver, Jr.
Life of this patent
Estimating the term…
Abstract
A mold assembly includes first and second mold sections having respective first and second mold cavity defining surfaces, the first mold cavity defining surface terminating in an encircling peripheral rim and the second mold cavity defining surface terminating in a deformable peripheral annulus disposed at a diameter corresponding to the rim, and cooperating tapers depending from each of the first and second molds for relatively centering the molds.
Claims28
A lens molding method comprising:
- depositing lens material in a first mold section;
- seating a second mold section adjacent the first mold section and sealing the first and second mold sections so as to define a mold cavity sealed at an edge thereof, with excess lens material being received in a space adjacent the edge of the mold cavity;
- curing the lens material to form a molded lens;
- and
- accommodating, during curing, shrinkage in the lens material by relatively deforming a rim of one of said first and second mold section and a deformable mating surface on the other of said first and second mold sections;
- wherein an edge of the lens is formed at a point of deformation of the rim and the deformable mating surface.
3 more elements
Dependencies are inferred from the claim text.