# US 12,601,864 B2 · Optical element, optical equipment, and imaging apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,601,864 B2 - Document ID: US12601864B2 - Status: Granted - Kind: B2 - Application number: 18/045,262 - Filed: 2022-10-10 - Published: 2023-04-13 - Granted: 2026-04-14 - Earliest claimed: 2021-10-13 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Hideo Ukuda - Web page: https://patentgrep.com/patent/US12601864B2 ## CPC - G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)} - G02B 5/1876: {Diffractive Fresnel lenses; Zone plates; Kinoforms (G02B5/1842, G02B5/1847 take precedence; optical systems having diffractive correction means G02B27/0037; Fresnel lenses operating by refraction G02B3/08)} - C08G 75/045: from mercapto compounds and unsaturated compounds - G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence) - G02B 5/1814: {structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings (G02B5/189 takes precedence)} - G02B 5/1852: {using mechanical means, e.g. ruling with diamond tool, moulding} - G02B 27/4205: {having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant} - H04N 23/50: Constructional details - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An optical element including a first optical layer, a second optical layer, and a transparent base material, the first optical layer being disposed between the second optical layer and the transparent base material and a diffraction grating being disposed at the interface between the first optical layer and the second optical layer, wherein the refractive index of the d-line of the second optical layer is higher than the refractive index of the d-line of the first optical layer, the Abbe number of the second optical layer is higher than the Abbe number of the first optical layer, the first optical layer is composed of a first resin and inorganic particles dispersed in the first optical layer, and the second optical layer is composed of a second resin having a modulus of elasticity of 0.1 GPa or more and 3.0 GPa or less at 22° C. or higher and 24° C. or lower. ## Claims ### Claim 1 An optical element comprising: a first optical layer; a second optical layer; and a transparent base material, the first optical layer being disposed between the second optical layer and the transparent base material and a diffraction grating being disposed at the interface between the first optical layer and the second optical layer, wherein the refractive index of the d-line of the second optical layer is higher than the refractive index of the d-line of the first optical layer, the Abbe number of the second optical layer is higher than the Abbe number of the first optical layer, the first optical layer is composed of a first resin and inorganic particles dispersed in the first resin, and the second optical layer is composed of a second resin having a modulus of elasticity of 0.1 GPa or more and 3.0 GPa or less at 22° C. or higher and 24° C. or lower, wherein the second resin is an ene-thiol-based resin, wherein the inorganic particles dispersed in the first resin are composed of an indium tin compound that is a transparent electroconductive substance, and have an average primary particle diameter of 3 nm to 20 nm. ### Claim 2 (depends on 1) The optical element according to claim 1, wherein the refractive index of the first optical layer is 1.54 or more and 1.58 or less. ### Claim 3 (depends on 1) The optical element according to claim 1, wherein the second resin has a modulus of elasticity of 0.1 GPa or more and 2.5 GPa or less at 22° C. or higher and 24° C. or lower. ### Claim 4 (depends on 1) The optical element according to claim 1, wherein the Abbe number of the first optical layer is 19 or more and 28 or less. ### Claim 5 (depends on 1) The optical element according to claim 1, wherein the Abbe number of the first optical layer is an Abbe number at 435.8 nm to 656.3 nm. ### Claim 6 (depends on 1) The optical element according to claim 1, wherein a difference between the refractive index of the first optical layer and the refractive index of the second optical layer is 0.027 or more and 0.047 or less. ### Claim 7 (depends on 1) The optical element according to claim 1, wherein the second optical layer is bonded to the first optical layer and a transparent base material different from the transparent base material and disposed by bonding between the first optical layer and the transparent base material different from the transparent base material. ### Claim 8 (depends on 1) The optical element according to claim 1, wherein a length from a grating apex of the first optical layer to a grating valley adjoining the grating apex is 1 μm or more and 30 μm or less. ### Claim 9 (depends on 8) The optical element according to claim 8, wherein the length is smaller than a thickness of the second optical layer. ### Claim 10 (depends on 1) The optical element according to claim 1, wherein the thickness of the second optical layer is 20 μm or more and 80 μm or less. ### Claim 11 (depends on 1) Optical equipment comprising: a housing; and a lens provided with the optical element according to claim 1 in the interior of the housing. ### Claim 12 (depends on 11) The optical equipment according to claim 11, wherein the lens is 40 mm or more and 60 mm or less in size. ### Claim 13 (depends on 11) An imaging apparatus comprising: the optical equipment according to claim 11; and an imaging element for receiving light passed through the optical equipment.