Injection molding process for rotationally asymmetric contact lens surfaces
First Claim
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1. An assembly for injection molding a contact lens mold comprising:
- a first molding tool including a convex or concave first molding surface that is rotationally asymmetric and has an optical quality finish, said first molding surface for forming an optical surface on the contact lens mold,a second molding tool including a concave or convex second molding surface that is rotationally asymmetric, said second molding surface for forming a surface of the contact lens mold which is opposed to said optical surface of the contact lens mold,wherein the first and second molding tools are positioned in opposed relationship to form a space therebetween in a manner that the first and second molding surfaces are spaced substantially uniformly across their surfaces,means for injecting a plastic resin into the space formed between the first and second molding surfaces to form the contact lens mold.
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Abstract
A method of injection molding contact lens molds for cast molding contact lenses having a rotationally asymmetric lens surface, and apparatus for carrying out the method, are disclosed.
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Citations
11 Claims
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1. An assembly for injection molding a contact lens mold comprising:
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a first molding tool including a convex or concave first molding surface that is rotationally asymmetric and has an optical quality finish, said first molding surface for forming an optical surface on the contact lens mold, a second molding tool including a concave or convex second molding surface that is rotationally asymmetric, said second molding surface for forming a surface of the contact lens mold which is opposed to said optical surface of the contact lens mold, wherein the first and second molding tools are positioned in opposed relationship to form a space therebetween in a manner that the first and second molding surfaces are spaced substantially uniformly across their surfaces, means for injecting a plastic resin into the space formed between the first and second molding surfaces to form the contact lens mold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for injection molding a contact lens mold comprising:
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providing a first molding tool including a convex molding surface, and a second molding tool including a concave molding surface, wherein one of said convex or concave molding surfaces has an optical quality finish and is rotationally asymmetric, said one molding surface for forming an optical surface on the contact lens mold, and the other of said convex or concave molding surface is rotationally asymmetric, said other molding surface for forming a surface of the contact lens mold which is opposed to the optical surface of the contact lens mold, positioning the molding tools in opposed relationship to form a space therebetween, such that the respective molding surfaces are spaced substantially uniformly across their surfaces, and injecting a plastic resin into the space formed between the molding surfaces to form the contact lens mold. - View Dependent Claims (9, 10, 11)
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Specification