# US 11,440,869 B2 · Compound, resin precursor, cured product, optical element, optical system, interchangeable lens for camera, optical device, cemented lens, and production method for cemented lens > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,440,869 B2 - Document ID: US11440869B2 - Status: Granted - Kind: B2 - Application number: 16/831,292 - Filed: 2020-03-26 - Published: 2020-07-16 - Granted: 2022-09-13 - Earliest claimed: 2017-10-03 - Assignees: Nikon Corporation - Applicants: Nikon Corporation - Inventors: Yoshihiro Someya; Masayuki Shijo - Web page: https://patentgrep.com/patent/US11440869B2 ## CPC - C07C 69/54: Acrylic acid esters; Methacrylic acid esters - C07C 69/602: Dicarboxylic acid esters having at least two carbon-to-carbon double bonds - C08F 220/20: of polyhydric alcohols or phenols {, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate} - C08F 220/24: containing perhaloalkyl radicals - C08F 222/1025: {of aromatic dialcohols} - G02B 1/041: {Lenses} - G02B 3/00: Simple or compound lenses - G02B 7/14: adapted to interchange lenses {(G02B7/027 takes precedence)} - C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A compound expressed in the following formula (1) (where R1 and R2 independently denote a hydrogen atom or a methyl group, Y1 and Y2 independently denote an alkylene group having a carbon number of 1 to 9, and n1 and n2 independently denote an integer of 0 to 3). ## Claims ### Claim 1 A compound expressed in the following formula (1) (where R1 and R2 independently denote a hydrogen atom or a methyl group, Y1 and Y2 independently denote an alkylene group having a carbon number of 1 to 9, and n1 and n2 independently denote an integer of 0 to 3). ### Claim 2 (depends on 1) A resin precursor comprising: the compound according to claim 1; and a curable composition. ### Claim 3 (depends on 2) The resin precursor according to claim 2, wherein the curable composition is a photocurable composition. ### Claim 4 (depends on 2) The resin precursor according to claim 2, wherein the curable composition includes at least one selected from a group consisting of a fluorine-containing acrylate compound, a fluorine-containing methacrylate compound, an acrylate compound having a fluorene structure, a methacrylate compound having a fluorene structure, a diacrylate compound, and a dimethacrylate compound. ### Claim 5 (depends on 2) The resin precursor according to claim 2, wherein the curable composition includes at least one selected from a group consisting of 1,6-di(meth)acryloyloxy-2,2,3,3,4,4,5,5-octafluorohexane, 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, and 1,6-hexanediol diacrylate. ### Claim 6 (depends on 2) The resin precursor according to claim 2, wherein a content of the compound is 10 to 50 mass %. ### Claim 7 (depends on 2) A cured product obtained by curing the resin precursor according to claim 2. ### Claim 8 (depends on 7) The cured product according to claim 7, wherein a θgF value is set to 0.5 or greater. ### Claim 9 (depends on 7) The cured product according to claim 7, wherein a refractive index (nd) for a d-line is set to 1.50 or higher and 1.65 or lower. ### Claim 10 (depends on 7) The cured product according to claim 7, wherein an Abbe number (νd) is set to 10 or greater and 40 or smaller. ### Claim 11 (depends on 7) The cured product according to claim 7, wherein an internal transmittance is 90% or higher over a wavelength range of 440 to 650 nm. ### Claim 12 (depends on 7) An optical element obtained by using the cured product according to claim 7. ### Claim 13 (depends on 12) An optical system comprising the optical element according to claim 12. ### Claim 14 (depends on 13) An interchangeable lens for camera comprising the optical system according to claim 13. ### Claim 15 (depends on 13) An optical device comprising the optical system according to claim 13. ### Claim 16 (depends on 7) A cemented lens comprising a first lens element and a second lens element bonded by interposing the cured product according to claim 7. ### Claim 17 (depends on 16) An optical system comprising the cemented lens according to claim 16. ### Claim 18 (depends on 17) An interchangeable lens for camera comprising the optical system according to claim 17. ### Claim 19 (depends on 17) An optical device comprising the optical system according to claim 17. ### Claim 20 (depends on 2) A production method for cemented lens, comprising: an adjoining step of adjoining a first lens element and a second lens element by interposing the resin precursor according to claim 2; and a bonding step of bonding the first lens element and the second lens element by curing the resin precursor. ### Claim 21 (depends on 20) The production method for cemented lens according to claim 20, wherein, in the bonding step, the resin precursor is cured by receiving an irradiated light. ### Claim 22 (depends on 21) The production method for cemented lens according to claim 21, wherein the light is irradiated onto the resin precursor through the first lens element. ### Claim 23 (depends on 21) The production method for cemented lens according to claim 21, wherein the light is irradiated onto the resin precursor through the second lens element.