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US 10,029,432 B2Granted
Methods for making ophthalmic lenses with an axis positioning system
AssigneeCooperVision International Holding Company, LP
InventorJohn Leone
Life of this patent
Estimating the term…
Abstract
Methods for making ophthalmic lenses are generally discussed herein with particular discussions extended to plastic injection molded ophthalmic lens molds that are machined or lens buttons located on the injection molds that are machined. The machine process can include setting a lens axis of the ophthalmic lens and machining a ballast that is aligned to a major axis of a toric zone.
Claims21
A method for producing an ophthalmic lens, comprising:
- providing a plastic mold section having a lens button with a posterior surface comprising a toric zone with a major axis;
- mounting the plastic mold section onto a mandrel, said mandrel having a flywheel, a base unit, and a projection having a rotational axis that is offset from a rotational axis of a lathe assembly;
- fixing the flywheel to a first reference point with an aligner so that the first reference point is at a first radian position;
- rotating the base unit relative to the flywheel so that a second reference point is at a second radian position;
- and
- using vacuum to fix the flywheel and the base unit from rotating relative to one another.
3 more elements
A method for producing an ophthalmic lens, comprising:
- providing a plastic mold section having a lens button with a posterior surface having a toric zone with a major axis;
- mounting the plastic mold section onto a projection on a mandrel, said mandrel having a flywheel, a base unit, and the projection has a rotational axis that is offset from a rotational axis of a lathe assembly;
- fixing a reference point on the flywheel to a first radian position;
- rotating the base unit relative to the flywheel so that a second reference point on the base unit is at a second radian position;
- and
- applying a vacuum to fix the flywheel and the base unit from rotating relative to one another.
3 more elements
A method for producing an ophthalmic lens, comprising:
- providing a plastic mold section having lens button with a posterior surface having a toric zone with a major axis;
- mounting the plastic mold section onto a mandrel, said mandrel having a flywheel, a base unit, and a projection having a rotational axis that is offset from a rotational axis of a lathe assembly;
- setting the major axis of the toric zone to a first radian position by fixing the flywheel from rotating;
- setting a reference point on the base unit of the mandrel to a second radian position, which sets an area on the lens button to be machined by a cutting tool;
- fixing the first radian position and the second radian position relative to one another;
- rotating the mandrel with the first radian position and the second radian position fixed to one another;
- and
- wherein the fixing step comprises a vacuum.
5 more elements
A method for producing an ophthalmic lens, comprising:
- providing a plastic mold section having a lens button with a posterior surface comprising a toric zone with a major axis;
- mounting the plastic mold section onto a mandrel, said mandrel having a flywheel, a base unit, and a projection having a rotational axis that is offset from a rotational axis of a lathe assembly;
- fixing the flywheel to a first reference point by actuating an aligner so that the first reference point is at a first radian position;
- rotating the base unit relative to the flywheel so that a second reference point is at a second radian position;
- fixing the flywheel and the base unit from rotating relative to one another;
- and
- wherein the aligner comprises a pneumatic block comprising a stationary block and a movable block that moves relative to one another when the aligner is actuated.
4 more elements
Dependencies are inferred from the claim text.