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US 6,328,445 B1Granted
Methods and apparatus for eyeglass lens curing using ultraviolet light
AssigneeQ2100, Inc.
InventorOmar M. Buazza
Life of this patent
Estimating the term…
Abstract
Method and apparatus for making and coating a plastic lens. Oxygen barrier containing photoinitiator is used to cure incompletely cured lens portions. Radiation pulses are used to control lens curing rate. Lens is postcured while in a mold cavity using a conductive heat source.
Claims34
An eyeglass lens made by the method comprising:
- placing a liquid polymerizable lens forming composition in a mold cavity defined by at least a first mold member and a second mold member;
- wherein the liquid polymerizable lens forming composition comprises:
- a photoinitiator;
- an aromatic containing bis(allyl carbonate)-functional monomer;
- and
- a polyethylenic-functional monomer containing at least two ethylenically unsaturated groups selected from acrylyl and methacrylyl;
- directing first ultraviolet rays toward at least one of the mold members to cure the lens forming composition so that it forms a lens with a back face, edges, and a front face;
- applying a mold member of the mold cavity to a substantially solid conductive heat source;
- and
- conductively applying heat to a face of the lens by (a) conductively transferring heat to a face of a mold member from the conductive heat source, and (b) conductively transferring heat through such mold member to the face of the lens.
7 more elements
A plastic eyeglass lens made by the method comprising:
- placing a liquid polymerizable lens forming composition in a mold cavity defined by at least a gasket, a first mold member, and a second mold member;
- wherein the liquid polymerizable lens forming composition comprises:
- a photoinitiator;
- an aromatic containing bis(allyl carbonate)-functional monomer;
- and
- a polyethylenic-functional monomer containing at least two ethylenically unsaturated groups selected from acrylyl and methacrylyl;
- directing first ultraviolet rays toward at least one of the mold members to cure the lens forming composition so that it forms a lens with a back face, edges, and a front face;
- shaping a flexible member such that it substantially conforms to a face of a mold member;
- applying a mold member of the mold cavity to the flexible member, the flexible member being on top of a conductive heat source;
- conductively applying heat to a face of the lens by (a) conductively applying heat to a face of a mold member from the conductive heat source, and (b) conductively transferring heat through such mold member to the lens.
7 more elements
Dependencies are inferred from the claim text.