Supporting pillars for encapsulating a flexible PCB within a soft hydrogel contact lens
A contact lens may include a body of contact lens material extending between a first surface and a second surface. An electromechanical component may be supported in the contact lens material between the first surface and the second surface. A support comprising a plurality of pillars may be formed of the contact lens material and may extend from at least one of the first surface and the second surface to the electromechanical component.
1. A method of fabricating a contact lens, the method comprising:
forming a support of a contact lens material on a first contact lens mold;
partially curing the support;
placing electromechanical components on the support;
filling a mold with the contact lens material, the mold comprising the first contact lens mold and a second contact lens mold with the electromechanical components therebetween; and
curing the contact lens material.
2. The method of claim 1 , wherein forming the support of the contact lens material on the first contact lens mold comprises: placing a mask having wells over the first contact lens mold; and filling the mask wells with the contact lens material.
3. The method of claim 1 , wherein forming the support of the contact lens material on the first contact lens mold comprises: coating the first contact lens mold with the contact lens material, and placing a mask having apertures over the mold; and wherein partially curing the support comprises exposing the contact lens material to curing radiation through the apertures in the mask.
4. The method of claim 3 , wherein forming the support of the contact lens material on the first contact lens mold comprises: spin forming the coating on the first contact lens mold.
5. The method of claim 1 , wherein forming the support of the contact lens material on the first contact lens mold comprises: spin forming a coating with a thickness of between 0.001 mm and 0.05 mm on the first contact lens mold with the contact lens material, and at least partially curing the coating; and forming the support on the at least partially cured coating.
6. The method of claim 1 , further comprising hydrating the cured contact lens material.
7. The method of claim 1 , wherein the support comprises a plurality of supports extending between the first contact lens mold and the electromechanical components.
8. The method of claim 1 , wherein the electromechanical component has a first shape and wherein the support is formed with a second shape the corresponds to the first shape.
9. The method of claim 8 , wherein the second shape is the same as the first shape.
10. The method of claim 1 , wherein the support has a height of between 0.020 mm and 0.3 mm, a width of between 0.020 mm and 2 mm, and a height of between 30% and 70% of a final thickness of the contact lens.
11. The method of claim 1 , wherein the support has a volume of between 0.005 uL and 0.5 uL.
12. The method of claim 1 , wherein the electromechanical component includes one or more of a flexible PCB, a power source, a processor, and a light source.
13. The method of claim 1 , wherein the electromechanical component comprises a pre-formed flexible PCB having a hemispherical shape.
14. The method of claim 1 , wherein the support comprises a plurality of supports arranged in two concentric rings about a clear central zone.
15. The method of claim 1 , wherein the support comprises a plurality of supports arranged in a first density to support a first portion of the electromechanical components and in a second density to support a second portion of the electromechanical components.
16. The method of claim 1 , wherein the support comprises a plurality of supports each having a width and arranged with a distance of between 0.2 widths and 5 widths from each other and optionally wherein the distance is between 0.10 mm and 1.0 mm.
17. The method of claim 1 , wherein the contact lens material comprises a material with 0% to 2% swell.
18. The method of claim 1 , wherein partially curing the support comprises one or more of UV curing or heat curing.
19. The method of claim 1 , wherein the support is formed with a first contact lens material prior to filling the mold and wherein the mold is filled with a second contact lens material, the first contact lens material substantially the same as the second contact lens material.
20. The method of claim 19 , wherein the partially cured support formed of the first contact lens material and the second contact lens material filling the mold are fully cured together prior to removing the contact lens from between the first contact lens mold and the second contact lens mold.