Apparatus for forming an ophthalmic lens

Patent metadata

Field	Value
Publication number	US-11364696-B2
Application number	US-202017024883-A
Country	US
Kind code	B2
Filing date	Sep 18, 2020
Priority date	Sep 18, 2020
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

This invention discloses apparatus for generating an ophthalmic lens with at least a portion of one surface free-formed from a Reactive Mixture. In some embodiments, an ophthalmic lens is formed on a substrate with an arcuate optical quality surface via a source of actinic radiation controllable to cure a definable portion of a volume of Reactive Mixture.

First claim

The invention claimed is:

1. A method for selectively polymerizing a reactive monomer mixture on a voxel by voxel basis to form a lens precursor, comprising:
obtaining a reactive monomer mixture including an initiator and a UV blocker, wherein said initiator initiates polymerization of the reactive monomer mixture when exposed to a predetermined narrow spectral band of light, and wherein said UV blocker at least partially absorbs light within said predetermined narrow spectral band of light;
placing said reactive monomer mixture in a container, wherein a shape of said container does not influence a shape of said lens precursor to be formed;
at least partially submerging a convex optical quality surface of a light transmissible forming optic within said reactive monomer mixture in said container, said convex optical quality surface having a shape complementary to a concave surface of said lens precursor to be formed;
obtaining an actinic radiation generation device and positioning it so as to direct actinic radiation of said predetermined narrow spectral band of light through said forming optic and into said container of reactive monomer mixture, wherein said radiation generation device includes an array of individually controllable elements that selectively control an array of individual actinic radiation beams;
calculating a desired depth of cure of said reactive monomer mixture at each location of said individual actinic radiation beams,
for each of the individually controllable elements, calculating a time period that said individually controllable elements must be turned on to achieve said desired depth of cure, wherein said time period is based on said initiator and UV blocker present in said reactive monomer mixture and said predetermined period to cure said reactive monomer mixture to form said lens precursor on a voxel by voxel basis;
narrow spectral band of light;
turning on each of said individually controllable elements for the time period to cure said reactive monomer mixture to form said lens precursor on a voxel by voxel basis.

2. The method according to claim 1 , wherein the predetermined narrow spectral band is centered around 365 nm.

3. The method according to claim 1 , wherein said actinic radiation generation device is a light emitting diode.

4. The method according to claim 1 , wherein the actinic radiation generation device is selected from the group consisting of a light emitting diode, an incandescent light source, laser light source, and lamp light source.

5. The method according to claim 1 , wherein the actinic radiation generation device further includes at least one filter deployed on the actinic radiation generation device to selectively filter light other than the predetermined narrow spectral band.

Assignees

• Johnson & Johnson Vision Care

Inventors

• Widman Michael F
• Enns John B
• Powell P Mark
• Sites Peter W

Classifications

• B29D11/00153

  Differential curing, e.g. by differential radiation · CPC title

• B29D11/00038 Primary

  Production of contact lenses · CPC title

• B29D11/00144 Primary

  wherein the lens material is not fully polymerized, e.g. by leaving an unpolymerized volume · CPC title

• B29K2105/0002

  monomers or prepolymers · CPC title