SYSTEMS, DEVICES, AND METHODS FOR EMBEDDING A HOLOGRAPHIC OPTICAL ELEMENT IN AN EYEGLASS LENS
Systems, devices, and methods for embedding a HOE in an eyeglass lens are described. A method of embedding a HOE in an eyeglass lens includes forming a world-side portion of the eyeglass lens, forming an eye-side portion of the eyeglass lens, physically coupling the eye-side portion of the eyeglass lens to the HOE with a low-temperature optically clear adhesive (“LT-OCA”), and physically coupling the world-side portion of the eyeglass lens to the HOE with LT-OCA. Forming the lens portions may include high-temperature processes, and the HOE may not be damaged by the high-temperature processes since the high-temperature processes may be performed on the lens portions prior to coupling the lens portions to the HOE.
1 . A method of embedding a holographic optical element (“HOE”) in an eyeglass lens for use in a wearable heads-up display, the method comprising:
forming an eye-side portion of the eyeglass lens;
forming a world-side portion of the eyeglass lens;
physically coupling a world-side surface of the eye-side portion of the eyeglass lens to an eye-side surface of the HOE with a first layer of low-temperature optically clear adhesive (“LT-OCA”); and
physically coupling an eye-side surface of the world-side portion of the eyeglass lens to a world-side surface of the HOE with a second layer of LT-OCA.
2 . The method of claim 1 wherein forming an eye-side portion of the eyeglass lens includes forming the eye-side portion of the eyeglass lens at a temperature that exceeds the maximum stable temperature of the HOE.
3 . The method of claim 1 wherein forming a world-side portion of the eyeglass lens includes forming the world-side portion of the eyeglass lens at a temperature that exceeds a maximum stable temperature of the HOE.
4 . The method of claim 1 , further comprising curing the LT-OCA at a temperature that is below the maximum stable temperature of the HOE.
5 . The method of claim 1 wherein curing the LT-OCA includes photo-curing the LT-OCA.
6 . The method of claim 1 wherein:
forming a world-side portion of the eyeglass lens includes shaping the world-side portion of the eyeglass lens to have a curved world-side surface; and
forming an eye-side portion of the eyeglass lens includes shaping the eye-side portion of the eyeglass lens to have a curved eye-side surface.
7 . The method of claim 6 wherein the HOE is planar, and wherein:
forming a world-side portion of the eyeglass lens includes shaping the world-side portion of the eyeglass lens to have a planar eye-side surface; and
forming an eye-side portion of the eyeglass lens includes shaping the eye-side portion of the eyeglass lens to have a planar world-side surface.
8 . The method of claim 6 wherein:
forming a world-side portion of the eyeglass lens includes shaping the world-side portion of the eyeglass lens to have a curved eye-side surface; and
forming an eye-side portion of the eyeglass lens includes shaping the eye-side portion of the eyeglass lens to have a curved world-side surface.
9 . The method of claim 8 , further comprising applying a curvature to the HOE, wherein the center or axis of the applied curvature is located on the eye-side of the eyeglass lens.
10 . The method of claim 1 wherein shaping the world-side portion of the eyeglass lens to have a curved world-side surface and shaping the eye-side portion of the eyeglass lens to have a curved eye-side surface are performed together to provide the eyeglass lens with a refractive power in a range of −20 to +20 diopters.
11 . The method of claim 1 wherein shaping the eye-side portion of the eyeglass lens to have a curved eye-side surface includes shaping the eye-side portion of the eyeglass lens to have a curvature chosen from a group comprising any one or more of: an aspheric curvature, an atoric curvature, and a complex progressive curvature.
12 . The method of claim 1 wherein the HOE includes at least one photopolymer layer, the method further comprising: forming the HOE, wherein forming the HOE includes recording at least one hologram in the at least one photopolymer layer.
13 . The method of claim 1 , further comprising applying at least one coating to at least one surface of the eyeglass lens.
14 . The method of claim 1 wherein:
forming a world-side portion of the eyeglass lens includes forming a world-side portion of the eyeglass lens wherein the world-side portion of the eyeglass lens comprises a first lens material;
forming an eye-side portion of the eyeglass lens includes forming an eye-side portion of the eyeglass lens wherein the eye-side portion of the eyeglass lens comprises a second lens material; and
wherein the first lens material is different from the second lens material.
15 . The method of claim 1 wherein:
physically coupling an eye-side surface of the world-side portion of the eyeglass lens to a world-side surface of the HOE with a first layer of LT-OCA includes physically coupling an eye-side surface of the world-side portion of the eyeglass lens to a world-side surface of the HOE with a first layer of LT-OCA wherein the first layer of LT-OCA comprises a first LT-OCA;
physically coupling a world-side surface of the eye-side portion of the eyeglass lens to an eye-side surface of the HOE with a second layer of LT-OCA includes physically coupling a world-side surface of the eye-side portion of the eyeglass lens to an eye-side surface of the HOE with a second layer of LT-OCA wherein the second layer of LT-OCA comprises a second LT-OCA layer; and
wherein the first LT-OCA is different from the second LT-OCA.