# US 12,001,030 B1 · Shadow-matched Fresnel lens doublet for reduced optical artifacts > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,001,030 B1 - Document ID: US12001030B1 - Status: Granted - Kind: B1 - Application number: 17/954,237 - Filed: 2022-09-27 - Granted: 2024-06-04 - Earliest claimed: 2019-02-11 - Assignees: Meta Platforms Technologies, LLC - Applicants: Meta Platforms Technologies, LLC - Inventors: Brian Wheelwright; Jacques Gollier - Web page: https://patentgrep.com/patent/US12001030B1 ## CPC - G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)} - G02B 3/10: Bifocal lenses; Multifocal lenses - G02B 7/021: {for more than one lens} - G02B 7/022: {lens and mount having complementary engagement means, e.g. screw/thread} - G02B 2027/0187: {slaved to motion of at least a part of the body of the user, e.g. head, eye} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A lens assembly includes a first lens and a second lens. The first lens has a first lens surface and a second lens surface opposite to the first lens surface. The second lens surface includes a first plurality of Fresnel structures. The second lens, coupled to the first lens, has a third lens surface and a fourth lens surface opposite to the third lens surface. The third lens surface includes a second plurality of Fresnel structures. The third lens surface faces the first lens and the second lens surface faces the second lens. A headset that includes a display and the lens assembly is also disclosed. A method of transmitting, with the lens assembly, light from the display toward an image plane is also disclosed. ## Claims ### Claim 1 A lens assembly, comprising: a first lens having (i) a first convex lens surface and (ii) a first concave lens surface that is opposite to the first convex lens surface and includes a first plurality of Fresnel structures; and a second lens having (iii) a second convex lens surface and (iv) a second concave lens surface opposite to the second convex lens surface, wherein the first concave lens surface faces the second lens and is separated from the second convex lens surface by a distance that varies across the first concave lens surface and the first convex lens surface is a smooth surface and the second concave lens surface is a smooth surface. ### Claim 2 (depends on 1) The lens assembly of claim 1, wherein: the second convex lens surface includes a second plurality of Fresnel structures. ### Claim 3 (depends on 2) The lens assembly of claim 2, wherein: at least a portion of the first plurality of Fresnel structures has a planar baseline; and at least a portion of the second plurality of Fresnel structures has a planar baseline. ### Claim 4 (depends on 2) The lens assembly of claim 2, wherein: a respective Fresnel structure of the first plurality of Fresnel structures corresponds to a distinct Fresnel structure of the second plurality of Fresnel structures. ### Claim 5 (depends on 2) The lens assembly of claim 2, wherein: a number of Fresnel structures in the first plurality of Fresnel structures is identical to a number of Fresnel structures in the second plurality of Fresnel structures. ### Claim 6 (depends on 2) The lens assembly of claim 2, wherein: the first plurality of Fresnel structures is separated from the second plurality of Fresnel structures. ### Claim 7 (depends on 6) The lens assembly of claim 6, wherein: the first plurality of Fresnel structures is separated from the second plurality of Fresnel structures by a gap less than 1 mm. ### Claim 8 (depends on 1) The lens assembly of claim 1, wherein: the first lens has one or more protrusions positioned near an edge of the first lens and the second lens has one or more notches positioned near an edge of the second lens, wherein the one or more protrusions of the first lens are configured to slidingly couple with the one or more notches of the second lens. ### Claim 9 A headset, comprising: a display; and a lens assembly that includes: a first lens having (i) a first convex lens surface and (ii) a first concave lens surface that is opposite to the first convex lens surface and includes a first plurality of Fresnel structures; and a second lens having (iii) a second convex lens surface and (iv) a second concave lens surface opposite to the second convex lens surface, wherein the first concave lens surface faces the second lens and is separated from the second convex lens surface by a distance that varies across the first concave lens surface. ### Claim 10 (depends on 9) The headset of claim 9, wherein: the second convex lens surface includes a second plurality of Fresnel structures. ### Claim 11 (depends on 10) The headset of claim 10, wherein: at least a portion of the first plurality of Fresnel structures has a planar baseline; and at least a portion of the second plurality of Fresnel structures has a planar baseline. ### Claim 12 (depends on 10) The headset of claim 10, wherein: a respective Fresnel structure of the first plurality of Fresnel structures corresponds to a distinct Fresnel structure of the second plurality of Fresnel structures. ### Claim 13 (depends on 10) The headset of claim 10, wherein: a number of Fresnel structures in the first plurality of Fresnel structures is identical to a number of Fresnel structures in the second plurality of Fresnel structures. ### Claim 14 (depends on 10) The headset of claim 10, wherein: the first plurality of Fresnel structures is separated from the second plurality of Fresnel structures. ### Claim 15 (depends on 14) The headset of claim 14, wherein: the first plurality of Fresnel structures is separated from the second plurality of Fresnel structures by a gap less than 1 mm. ### Claim 16 (depends on 9) The headset of claim 9, wherein: the first convex lens surface is a smooth surface and the second concave lens surface is a smooth surface. ### Claim 17 (depends on 9) The headset of claim 9, wherein: the first lens has one or more protrusions positioned near an edge of the first lens and the second lens has one or more notches positioned near an edge of the second lens, wherein the one or more protrusions of the first lens are configured to slidingly couple with the one or more notches of the second lens. ### Claim 18 A method, comprising: transmitting, with a lens assembly, light from a display toward an image plane, wherein the lens assembly includes: a first lens having (i) a first convex lens surface and (ii) a first concave lens surface that is opposite to the first convex lens surface and includes a first plurality of Fresnel structures; and a second lens having (iii) a second convex lens surface and (iv) a second concave lens surface opposite to the second convex lens surface, wherein the first concave lens surface faces the second lens and is separated from the second convex lens surface by a distance that varies across the first concave lens surface. ### Claim 19 (depends on 18) The method of claim 18, wherein: the second convex lens surface includes a second plurality of Fresnel structures; and transmitting the light from the display toward the image plane includes transmitting a respective ray from a respective location of the display to the image plane through a Fresnel structure of the first plurality of Fresnel structures and a corresponding Fresnel structure of the second plurality of Fresnel structures.