# US 12,111,560 B2 · Imaging lens 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 12,111,560 B2 - Document ID: US12111560B2 - Status: Granted - Kind: B2 - Application number: 17/208,013 - Filed: 2021-03-22 - Published: 2021-07-08 - Granted: 2024-10-08 - Earliest claimed: 2018-11-06 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Shinichi Shimotsu - Web page: https://patentgrep.com/patent/US12111560B2 ## CPC - G03B 11/00: Filters or other obturators specially adapted for photographic purposes - G02B 1/10: Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence) - G02B 5/208: {for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation} - G02B 5/281: {designed for the infrared light} - G02B 5/285: {comprising deposited thin solid films (G02B5/281 - G02B5/289 take precedence; multilayered film filters for fibre optic multiplexing G02B6/29361)} - G02B 7/006: {Filter holders} - G02B 7/09: adapted for automatic focusing or varying magnification - G02B 7/102: {controlled by a microcomputer (cameras with interchangeable lenses G03B17/14)} - G02B 15/14: by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective - G02B 26/007: {the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light} - G03B 13/36: Autofocus systems - G03B 17/12: with means for supporting objectives, supplementary lenses, filters, masks, or turrets - H04N 23/11: for generating image signals from visible and infrared light wavelengths - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An imaging lens including: a plurality of lenses; and a coating provided on at least a part of the plurality of lenses. In a near-infrared light wavelength region, by the coating, light transmittance on a short wavelength side of a near-infrared light peak wavelength region including 1550 nm is reduced from light transmittance at a short wavelength end of the near-infrared light peak wavelength region as a wavelength is decreased, and light transmittance on a long wavelength side of the near-infrared light peak wavelength region is reduced from light transmittance at a long wavelength end of the near-infrared light peak wavelength region as the wavelength is increased. ## Claims ### Claim 1 An imaging lens comprising: a plurality of lenses; and a coating provided on at least a part of the plurality of lenses, wherein in a near-infrared light wavelength region, by the coating, light transmittance on a short wavelength side of a near-infrared light peak wavelength region including 1550 nm is reduced from light transmittance at a short wavelength end of the near-infrared light peak wavelength region as a wavelength is decreased, and light transmittance on a long wavelength side of the near-infrared light peak wavelength region is reduced from light transmittance at a long wavelength end of the near-infrared light peak wavelength region as the wavelength is increased, light transmittance in the near-infrared light peak wavelength region is greater than or equal to 60%, and in a visible light wavelength region, by the coating, light transmittance on a short wavelength side of a visible light peak wavelength region including a range of 500 nm to 650 nm is reduced from light transmittance at a short wavelength end of the visible light peak wavelength region as the wavelength is decreased, and light transmittance on a long wavelength side of the visible light peak wavelength region is reduced from light transmittance at a long wavelength end of the visible light peak wavelength region as the wavelength is increased. ### Claim 2 (depends on 1) The imaging lens according to claim 1, wherein a first variable of at least one of a size or the number of ripples showing a characteristic of changes in light transmittance in the near-infrared light peak wavelength region is less than a corresponding second variable of a size or the number of ripples showing a characteristic of changes in light transmittance in the visible light peak wavelength region. ### Claim 3 (depends on 1) The imaging lens according to claim 1, wherein light transmittance in a wavelength region on a short wavelength side in a blue wavelength region included in the visible light wavelength region is lower than light transmittance in a wavelength region on a long wavelength side in the blue wavelength region. ### Claim 4 (depends on 3) The imaging lens according to claim 3, wherein the wavelength region on the short wavelength side in the blue wavelength region is a wavelength region of less than or equal to 450 nm. ### Claim 5 (depends on 3) The imaging lens according to claim 3, wherein light transmittance in 400 nm to 430 nm is less than or equal to 50%. ### Claim 6 (depends on 1) The imaging lens according to claim 1, wherein by the coating, a low light transmittance region of lower light transmittance than the near-infrared light peak wavelength region and the visible light peak wavelength region is included between the near-infrared light peak wavelength region and the visible light peak wavelength region. ### Claim 7 (depends on 6) The imaging lens according to claim 6, wherein the low light transmittance region is a wavelength region of 900 nm to 1100 nm, and light transmittance in the wavelength region of 900 nm to 1100 nm is less than or equal to 5%. ### Claim 8 (depends on 1) The imaging lens according to claim 1, wherein a light transmittance peak of a ⅓ wavelength of a fundamental wave that is generated from the fundamental wave having a light transmittance peak in the near-infrared light peak wavelength region due to interference caused by the coating is present in the visible light peak wavelength region. ### Claim 9 An imaging lens comprising: a plurality of lenses; a coating provided on at least a part of the plurality of lenses, and an optical filter switching unit capable of arranging at least one of a first optical filter decreasing light transmittance of at least a part of visible light or a second optical filter decreasing light transmittance of at least a part of near-infrared light, on an optical path, wherein in a near-infrared light wavelength region, by the coating, light transmittance on a short wavelength side of a near-infrared light peak wavelength region including 1550 nm is reduced from light transmittance at a short wavelength end of the near-infrared light peak wavelength region as a wavelength is decreased, and light transmittance on a long wavelength side of the near-infrared light peak wavelength region is reduced from light transmittance at a long wavelength end of the near-infrared light peak wavelength region as the wavelength is increased, wherein light transmittance in the near-infrared light peak wavelength region is greater than or equal to 60%. ### Claim 10 (depends on 9) The imaging lens according to claim 9, wherein a product of a refractive index and a thickness of the second optical filter is greater than a product of a refractive index and a thickness of the first optical filter. ### Claim 11 (depends on 9) The imaging lens according to claim 9, wherein the optical filter switching unit arranged on an image formation side of a lens that is positioned closest to the image formation side among the plurality of lenses is included. ### Claim 12 (depends on 9) The imaging lens according to claim 9, further comprising: a control unit that has focusing position information indicating a focusing position in a case of arranging the first optical filter or the second optical filter on the optical path, and performs a control for changing a position of a focusing position adjustment lens between a case of arranging the first optical filter on the optical path and a case of arranging the second optical filter on the optical path, based on the focusing position information. ### Claim 13 (depends on 1) The imaging lens according to claim 1, further comprising: a zoom optical system. ### Claim 14 (depends on 9) An imaging apparatus comprising: the imaging lens according to claim 9; and an InGaAs imaging element that images a subject through the imaging lens. ### Claim 15 (depends on 1) An imaging apparatus comprising: the imaging lens according to claim 1; and an InGaAs imaging element that images a subject through the imaging lens. ### Claim 16 (depends on 2) An imaging apparatus comprising: the imaging lens according to claim 2; and an InGaAs imaging element that images a subject through the imaging lens. ### Claim 17 (depends on 3) An imaging apparatus comprising: the imaging lens according to claim 3; and an InGaAs imaging element that images a subject through the imaging lens. ### Claim 18 (depends on 4) An imaging apparatus comprising: the imaging lens according to claim 4; and an InGaAs imaging element that images a subject through the imaging lens. ### Claim 19 (depends on 5) An imaging apparatus comprising: the imaging lens according to claim 5; and an InGaAs imaging element that images a subject through the imaging lens.