# US 11,307,329 B1 · Low reflectance removable lens stack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,329 B1 - Document ID: US11307329B1 - Status: Granted - Kind: B1 - Application number: 17/386,304 - Filed: 2021-07-27 - Granted: 2022-04-19 - Earliest claimed: 2021-07-27 - Assignees: Racing Optics, Inc. - Applicants: Racing Optics, Inc. - Inventors: Stephen S. Wilson; Bart E. Wilson - Web page: https://patentgrep.com/patent/US11307329B1 ## CPC - G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures - G02B 3/02: with non-spherical faces (G02B3/10 takes precedence) - G02B 1/041: {Lenses} - G02B 27/0006: {with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation (G02B1/18 takes precedence; cleaning in general B08B)} - G02C 7/02: Lenses; Lens systems {; Methods of designing lenses} - G02C 2202/16: Laminated or compound lenses - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00) ## Abstract A removable lens stack comprises a base layer and one or more removable lens layers. The base layer may include a substrate having a first side and a second side opposite the first and may further include a moth eye coating on the first side of the substrate. Each removable lens layer may include a substrate having a first side and a second side opposite the first side, a moth eye coating on the first side of the substrate, and a fluoropolymer coating on the second side of the substrate. The removable lens layer(s) may be stacked on top of the base layer such that the second side of the substrate of each removable lens layer faces the first side of the substrate of an immediately preceding base layer or removable lens layer. Each fluoropolymer coating may be molded to fit the moth eye coating of the immediately preceding layer. ## Claims ### Claim 1 A removable lens stack comprising: a base layer including a substrate having a first side and a second side opposite the first side, the base layer further including a moth eye coating on the first side of the substrate; and one or more removable lens layers, each removable lens layer including a substrate having a first side and a second side opposite the first side, a moth eye coating on the first side of the substrate, and a fluoropolymer coating on the second side of the substrate, the one or more removable lens layers being stacked on top of the base layer such that the second side of the substrate of each removable lens layer faces the first side of the substrate of an immediately preceding layer from among the base layer and the one or more removable lens layers, each fluoropolymer coating being molded to fit the moth eye coating of the immediately preceding layer. ### Claim 2 (depends on 1) The removable lens stack of claim 1, wherein, in each of the one or more removable lens layers and the base layer, the moth eye coating comprises a polymer. ### Claim 3 (depends on 1) The removable lens stack of claim 1, wherein, in each of the one or more removable lens layers and the base layer, the moth eye coating defines a pattern of bumps with half-wave pitch. ### Claim 4 (depends on 1) The removable lens stack of claim 1, wherein, in each of the one or more removable lens layers and the base layer, the moth eye coating defines a pattern of bumps with half-wave height. ### Claim 5 (depends on 1) The removable lens stack of claim 1, wherein, in each of the one or more removable lens layers and the base layer, the moth eye coating defines a pattern of cones. ### Claim 6 (depends on 1) The removable lens stack of claim 1, wherein the base layer further includes a moth eye coating on the second side of the substrate. ### Claim 7 (depends on 1) The removable lens stack of claim 1, wherein, in each of the one or more removable lens layers and the base layer, the substrate comprises polyethylene terephthalate (PET). ### Claim 8 (depends on 1) The removable lens stack of claim 1, further comprising, in each of the one or more removable lens layers and the base layer, an adhesion treatment between the substrate and the moth eye coating. ### Claim 9 (depends on 8) The removable lens stack of claim 8, wherein the adhesion treatment comprises a pressure sensitive adhesive. ### Claim 10 (depends on 1) The removable lens stack of claim 1, further comprising, in each of the one or more removable lens layers, an adhesion treatment between the substrate and the fluoropolymer coating. ### Claim 11 (depends on 10) The removable lens stack of claim 10, wherein the adhesion treatment comprises a pressure sensitive adhesive. ### Claim 12 (depends on 1) The removable lens stack of claim 1, wherein a peel strength of each of the one or more removable lens layers is less than 100 grams per inch. ### Claim 13 (depends on 12) The removable lens stack of claim 12, wherein a peel strength of each of the one or more removable lens layers is between 15 and 50 grams per inch. ### Claim 14 (depends on 13) The removable lens stack of claim 13, wherein a peel strength of each of the one or more removable lens layers is between 15 and 30 grams per inch. ### Claim 15 (depends on 1) The removable lens stack of claim 1, wherein a visible light transmission (VLT) of the removable lens stack is greater than 95%. ### Claim 16 (depends on 15) The removable lens stack of claim 15, wherein the VLT of the removable lens stack is greater than 98%. ### Claim 17 A method of manufacturing a removable lens stack, the method comprising: providing a base layer including a substrate having a first side and a second side opposite the first side, the base layer further including a moth eye coating on the first side of the substrate; stacking one or more removable lens layers on top of the base layer, each removable lens layer including a substrate having a first side and a second side opposite the first side, a moth eye coating on the first side of the substrate, and a fluoropolymer coating on the second side of the substrate, the one or more removable lens layers being stacked on top of the base layer such that the second side of the substrate of each removable lens layer faces the first side of the substrate of an immediately preceding layer from among the base layer and the one or more removable lens layers; and laminating the stacked one or more removable lens layers to the base layer, each fluoropolymer coating being molded to fit the moth eye coating of the immediately preceding layer. ### Claim 18 (depends on 17) The method of claim 17, wherein said laminating comprises laminating the stacked one or more removable lens layers to the base layer under pressure at a temperature less than 40° C. ### Claim 19 (depends on 17) The method of claim 17, further comprising, in each of the one or more removable lens layers, applying a corona treatment between the substrate and the moth eye coating. ### Claim 20 (depends on 17) The method of claim 17, further comprising, in each of the one or more removable lens layers, applying a corona treatment between the substrate and the fluoropolymer coating.