# US 12,000,993 B2 · Optical imaging system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,000,993 B2 - Document ID: US12000993B2 - Status: Granted - Kind: B2 - Application number: 18/088,145 - Filed: 2022-12-23 - Published: 2023-04-27 - Granted: 2024-06-04 - Earliest claimed: 2016-11-25 - Assignees: Samsung Electro-Mechanics Co., Ltd. - Applicants: Samsung Electro-Mechanics Co., Ltd. - Inventors: Jung Hui Ko - Web page: https://patentgrep.com/patent/US12000993B2 ## CPC - G02B 13/0045: {having five or more lenses} - G02B 9/00: Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - (G02B15/00 takes precedence) - G02B 9/62: having six components only - G02B 13/00: Optical objectives specially designed for the purposes specified below (with variable magnification {in general} G02B15/00) - G02B 13/002: {having at least one aspherical surface} - G02B 27/0025: {for optical correction, e.g. distorsion, aberration} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An optical imaging system is described including first to sixth lenses sequentially disposed from an object side to an image side, and an image sensor configured to convert incident light reflected from a subject, having passed through the first to sixth lenses, into an electrical signal. One of the first to sixth lenses includes a spherical object-side surface and another of the first to sixth lenses includes corresponding aspherical object-side surfaces. The first to sixth lenses include corresponding aspherical image-side surfaces, and a lens of the first to sixth lenses that is closer to the object side than the one of the first to sixth lenses including the spherical object-side surface, has a highest refractive index among the first to sixth lenses. ## Claims ### Claim 1 An optical imaging system comprising: a first lens comprising positive refractive power, a convex object-side surface and a concave image-side surface; a second lens comprising negative refractive power, a convex object-side surface and a concave image-side surface; a third lens comprising positive refractive power; a fourth lens comprising negative refractive power; a fifth lens comprising refractive power; and a sixth lens comprising negative refractive power, wherein the first to sixth lenses are sequentially arranged from an object side to an image side, wherein the first to sixth lenses are formed of plastic material, wherein the optical imaging system has a total of six lenses, wherein f/(CT3+CT4+CT5)<4.0 is satisfied, where f is an overall focal length of the optical imaging system, CT3 is a thickness of the third lens in a paraxial region, CT4 is a thickness of the fourth lens in the paraxial region, and CT5 is a thickness of the fifth lens in the paraxial region, and wherein the second lens has the greatest refractive index among the first to sixth lenses and the second lens has a refractive index greater than 1.66. ### Claim 2 (depends on 1) The optical imaging system of claim 1, wherein the fourth lens has a concave image-side surface. ### Claim 3 (depends on 1) The optical imaging system of claim 1, wherein the sixth lens has a concave image-side surface. ### Claim 4 (depends on 1) The optical imaging system of claim 1, wherein at least one inflection point is formed on at least one of an object-side surface of the sixth lens and an image-side surface of the sixth lens. ### Claim 5 (depends on 1) The optical imaging system of claim 1, wherein TTL/(2*ImgH)<0.75 is satisfied, where TTL is a distance from the object-side surface of the first lens to an imaging plane of an image sensor, and ImgH is half a diagonal length of the imaging plane of the image sensor. ### Claim 6 (depends on 1) The optical imaging system of claim 1, wherein 2.0