# US 9,753,196 B2 · Optical filter, solid-state imaging element, imaging device lens and imaging device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,753,196 B2 - Document ID: US9753196B2 - Status: Granted - Kind: B2 - Application number: 14/992,585 - Filed: 2016-01-11 - Published: 2016-08-11 - Granted: 2017-09-05 - Earliest claimed: 2011-06-06 - Assignees: Asahi Glass Company, Limited - Applicants: Asahi Glass Company, Limited - Inventors: Makoto Hasegawa; Satoshi Kashiwabara; Hiroshi Shimoda; Kenta Sekikawa; Takashi Shibuya; Mitsuo Osawa; Katsushi Kamijyo; Hiroyuki Arishima; Hiroshi Kumai - Web page: https://patentgrep.com/patent/US9753196B2 ## CPC - G02B 5/223: {containing organic substances, e.g. dyes, inks or pigments} - C09B 23/086: {more than five >CH- groups} - C09B 23/107: {four >CH- groups} - C09B 57/007: {Squaraine dyes} - G02B 1/04: made of organic materials, e.g. plastics (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 5/282: {reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection} - G02B 13/004: {having four lenses} - G02B 13/005: {having spherical lenses only} - H10F 39/8053: {Colour filters} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P) - H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION ## Abstract The present invention relates to an optical filter, a solid-state imaging element and an imaging device lens which contain a near infrared ray absorbing layer having a specific near infrared ray absorbing dye dispersed in a transparent resin having a refractive index of 1.54 or more, and also relates to an imaging device containing the solid-state imaging element or the imaging device lens. The near infrared ray absorbing layer has a transmittance of visible light of from 450 to 600 nm of 70% or more, a transmittance of light in a wavelength region of from 695 to 720 nm of not more than 10%, and an amount of change of transmittance of not more than −0.8. ## Claims ### Claim 1 An optical filter comprising: a near infrared ray absorbing layer which comprises: a near infrared ray absorbing dye (A); and a transparent resin (B), the near infrared ray absorbing dye (A) being dispersed in the transparent resin (B); and a selective wavelength shielding layer provided on one side or both sides of the near infrared ray absorbing layer, the selective wavelength shielding layer transmitting visible light in a wavelength range of from 420 to 695 nm therethrough and shielding near infrared light in a wavelength range of from 720 to 1,100 nm, wherein the near infrared ray absorbing dye (A) comprises a near infrared ray absorbing dye (A1), an absorption spectrum of the near infrared ray absorbing dye (A1) in a wavelength range of from 400 to 1,000 nm having a maximum absorption peak at a peak wavelength, wherein the absorption spectrum is measured in a state in which the near infrared ray absorbing dye (A1) is dissolved in a solvent for dye having a refractive index (n20d) of less than 1.500; the absorption spectrum of the near infrared ray absorbing dye (A1) satisfies conditions (a) and (b): (a) a full width at half maximum of the maximum absorption peak is not more than 60 nm; and (b) when calculated with an absorbance at the peak wavelength being 1, a value obtained by dividing a difference between an absorbance at 630 nm and an absorbance at the maximum absorption peak by a wavelength difference between 630 nm and the peak wavelength (nm) is from 0.010 to 0.050; the selective wavelength shielding layer comprises a first dielectric multilayered film and a second dielectric multilayered film, wherein the first dielectric multilayer film transmits visible light and has a first reflecting range in which near infrared light is reflected and a transmittance of the near infrared light is not more than 5%, and the second dielectric multilayer film transmits visible light, reflects ultraviolet light, and optionally has a second reflecting range in which near infrared light is reflected and a transmittance of the near infrared light is not more than 5%; and the near infrared ray absorbing layer has a transmittance of visible light of from 450 to 600 nm of 70% or more, and an amount of change of transmittance (D) expressed by equation (1) of not more than −0.8: D(%/nm)=[T700(%)−T630(%)]/[700 (nm)−630 (nm)] (1) wherein in the equation (1), T700 is a transmittance at a wavelength of 700 nm in a transmission spectrum of the near infrared ray absorbing layer; and T630 is a transmittance at a wavelength of 630 nm in the transmission spectrum of the near infrared ray absorbing layer. ### Claim 2 (depends on 1) The optical filter according to claim 1, wherein the first dielectric multilayer film transmits visible light having a wavelength of from 420 to 695 nm therethrough, the near infrared ray absorbing layer has a near infrared ray absorbing range at wavelengths of 710 nm or greater in which a transmittance of light is not more than 5%, and a wavelength at a shorter wavelength end of the first reflecting range is equal to or shorter than a wavelength at a longer wavelength end of the near infrared ray absorbing range of the near infrared ray absorbing layer. ### Claim 3 (depends on 1) The optical filter according to claim 1, wherein the second dielectric multilayer film transmits visible light in a wavelength range of from 420 to 695 nm therethrough, the second dielectric multilayer film reflects in a wavelength range of 400 nm or shorter, a wavelength at a shorter wavelength end of the second reflecting range is equal to or shorter than a wavelength at a longer wavelength end of the first reflecting range, and a wavelength at a longer wavelength end of the second reflecting range is at least 1100 nm. ### Claim 4 (depends on 1) The optical filter according to claim 1, wherein a wavelength at a shorter wavelength end of the second reflecting range is shorter than a wavelength at a longer wavelength end of the first reflecting range by from 20 to 100 nm. ### Claim 5 (depends on 1) The optical filter according to claim 1, wherein the full width at half maximum of the maximum absorption peak in the absorption spectrum of the near infrared ray absorbing dye (A1) is not more than 35 nm. ### Claim 6 (depends on 1) The optical filter according to claim 1, wherein in the absorption spectrum of the near infrared ray absorbing dye (A1), when calculated with the absorbance at the peak wavelength being 1, the value obtained by dividing the difference between the absorbance at 630 nm and the absorbance at the maximum absorption peak by the wavelength difference between 630 nm and the peak wavelength (nm) is from 0.010 to 0.014. ### Claim 7 (depends on 1) The optical filter according to claim 1, wherein a light transmittance of the near infrared ray absorbing layer at a wavelength in a range of from 695 to 720 nm is not more than 10%. ### Claim 8 (depends on 1) The optical filter according to claim 1, wherein the near infrared ray absorbing dye (A1) comprises at least one member selected from squarylium compounds represented by formula (F1): wherein R1 and R2 are connected to each other to form ring A together with the nitrogen atom, ring A being a heterocyclic ring of a 5-membered or 6-membered ring which may contain an oxygen atom as a ring constituent atom, or R2 and R5 are connected to each other to form ring B together with the nitrogen atom, the carbon atom bonded to the nitrogen atom, and the carbon atom bonded to R5, ring B being a heterocyclic ring of a 5-membered or 6-membered ring which may contain an oxygen atom as a ring constituent atom; R1 that does not form ring A and R5 that does not form ring B each independently represent a hydrogen atom, a fluorine atom, a bromine atom, an alkyl group having from 1 to 6 carbon atoms which may have a substituent, an allyl group which may have a substituent, an aryl group having from 6 to 10 carbon atoms which may have a substituent, or an alaryl group having from 7 to 11 carbon atoms which may have a substituent; and the alkyl group having from 1 to 6 carbon atoms may be any of linear, branched or cyclic; each of R4 and R6 independently represents a hydrogen atom or —NR7R8, wherein each of R7 and R8 independently represents a hydrogen atom, an alkyl group having from 1 to 20 carbon atoms, or —C(═O)—R9, and R9 represents an alkyl group having from 1 to 20 carbon atoms or an aryl group having from 6 to 10 carbon atoms which may have a substituent; and each R3 independently represents a hydrogen atom or an alkyl group having from 1 to 6 carbon atoms. ### Claim 9 (depends on 1) The optical filter according to claim 1, wherein the near infrared ray absorbing dye (A) further comprises a near infrared ray absorbing dye (A2), an absorption spectrum of the near infrared ray absorbing dye (A2) in a wavelength range of from 400 to 1,000 nm having a maximum absorption peak at a peak wavelength, the absorption spectrum being measured in a state in which the near infrared ray absorbing dye (A2) is dissolved in a solvent having a refractive index (n20d) of less than 1.500, the absorption spectrum of the near infrared ray absorbing dye (A2) satisfying conditions (c) and (d): (c) the peak wavelength is in a range of more than 720 nm and not more than 800 nm; and (d) a full width at half maximum of the maximum absorption peak is not more than 100 nm. ### Claim 10 (depends on 9) The optical filter according to claim 9, wherein the near infrared ray absorbing dye (A2) comprises at least one member selected from cyanine compounds represented by formula (F2): wherein each R11 independently represents an alkyl group having from 1 to 20 carbon atoms, an alkoxy group, an alkylsulfone group, or an anion species thereof; each of R12 and R13 independently represents a hydrogen atom or an alkyl group having from 1 to 20 carbon atoms; Z represents PF6, ClO4, Rf—SO2, (Rf—SO2)2—N, or BF4, wherein Rf represents an alkyl group substituted with at least one fluorine atom; each of R14, R15, R16, and R17 independently represents a hydrogen atom, a halogen atom, or an alkyl group having from 1 to 6 carbon atoms; and n represents an integer of from 1 to 6. ### Claim 11 (depends on 1) The optical filter according to claim 1, wherein the transparent resin (B) comprises at least one member selected from the group consisting of an acrylic resin, an epoxy resin, an ene/thiol resin, a polycarbonate resin, and a polyester resin. ### Claim 12 (depends on 1) The optical filter according to claim 1, wherein in the near infrared ray absorbing layer, a proportion of the near infrared ray absorbing dye (A1) is from 3 to 100% by mass relative to the whole amount of the near infrared ray absorbing dye (A), and a proportion of the near infrared ray absorbing dye (A) is from 0.05 to 5 parts by mass based on 100 parts by mass of the transparent resin (B). ### Claim 13 (depends on 1) The optical filter according to claim 1, wherein the near infrared ray absorbing layer has a thickness of from 0.1 to 100 μm. ### Claim 14 (depends on 1) The optical filter according to claim 1, wherein the selective wavelength shielding layer comprises a dielectric multilayered film in which a low refractive index dielectric film and a high refractive index dielectric film are stacked alternately each other. ### Claim 15 (depends on 1) The optical filter according to claim 1, wherein the optical filter has a transmittance of visible light of from 420 to 620 nm being 70% or more, a transmittance of light in a wavelength range of from 710 to 860 nm being not more than 0.3%, and an amount of change of transmittance (Df) expressed by equation (2) being not more than −0.8: Df(%/nm)=[Tf700(%)−Tf630(%)]/[700 (nm)−630 (nm)] (2) wherein in the equation (2), Tf700 is a transmittance at a wavelength of 700 nm in a transmission spectrum of the optical filter; and Tf630 is a transmittance at a wavelength of 630 nm in the transmission spectrum of the optical filter. ### Claim 16 (depends on 1) The optical filter according to claim 1, further comprising a transparent base material, wherein the near infrared ray absorbing layer is provided directly or indirectly on the transparent base material, and the transparent base material is a colored glass sheet comprising CuO. ### Claim 17 (depends on 1) The optical filter according to claim 1, further comprising a transparent base material, wherein the near infrared ray absorbing layer is provided directly or indirectly on the transparent base material, and the transparent base material comprises a resin. ### Claim 18 (depends on 1) A solid-state imaging element comprising: a photoelectric conversion element; and the optical filter according to claim 1. ### Claim 19 An imaging device lens comprising: a near infrared ray absorbing layer formed on at least one surface of a lens main body, which comprises: a near infrared ray absorbing dye (A); and a transparent resin (B), the near infrared ray absorbing dye (A) being dispersed in the transparent resin (B); and a selective wavelength shielding layer provided on one side or both sides of the near infrared ray absorbing layer, the selective wavelength shielding layer transmitting visible light in a wavelength range of from 420 to 695 nm therethrough and shielding near infrared light in a wavelength range of from 720 to 1,100 nm, wherein the near infrared ray absorbing dye (A) comprises a near infrared ray absorbing dye (A1), an absorption spectrum of the near infrared ray absorbing dye (A1) in a wavelength range of from 400 to 1,000 nm having a maximum absorption peak at a peak wavelength, wherein the absorption spectrum is measured in a state in which the near infrared ray absorbing dye (A1) is dissolved in a solvent for dye having a refractive index (n20d) of less than 1.500; the absorption spectrum of the near infrared ray absorbing dye (A1) satisfies conditions (a) and (b): (a) a full width at half maximum of the maximum absorption peak is not more than 60 nm; and (b) when calculated with an absorbance at the peak wavelength being 1, a value obtained by dividing a difference between an absorbance at 630 nm and an absorbance at the maximum absorption peak by a wavelength difference between 630 nm and the peak wavelength (nm) is from 0.010 to 0.050; the selective wavelength shielding layer comprises a first dielectric multilayered film and a second dielectric multilayered film, wherein the first dielectric multilayer film transmits visible light and has a first reflecting range in which near infrared light is reflected and a transmittance of the near infrared light is not more than 5%, and the second dielectric multilayer film transmits visible light, reflects ultraviolet light, and optionally has a second reflecting range in which near infrared light is reflected and a transmittance of the near infrared light is not more than 5%; and the near infrared ray absorbing layer has a transmittance of visible light of from 450 to 600 nm of 70% or more, and an amount of change of transmittance (D) expressed by equation (1) of not more than −0.8: D(%/nm)=[T700(%)−T630(%)]/[700 (nm)−630 (nm)] (1) wherein in the equation (1), T700 is a transmittance at a wavelength of 700 nm in a transmission spectrum of the near infrared ray absorbing layer; and T630 is a transmittance at a wavelength of 630 nm in the transmission spectrum of the near infrared ray absorbing layer. ### Claim 20 (depends on 19) The imaging device lens according to claim 19, wherein the first dielectric multilayer film transmits visible light having a wavelength of from 420 to 695 nm therethrough, the near infrared ray absorbing layer has a near infrared ray absorbing range at wavelengths of 710 nm or greater in which a transmittance of light is not more than 5%, and a wavelength at a shorter wavelength end of the first reflecting range is equal to or shorter than a wavelength at a longer wavelength end of the near infrared ray absorbing range of the near infrared ray absorbing layer. ### Claim 21 (depends on 19) The imaging device lens according to claim 19, wherein the second dielectric multilayer film transmits visible light in a wavelength range of from 420 to 695 nm therethrough, the second dielectric multilayer film reflects light in a wavelength range of 400 nm or shorter, a wavelength at a shorter wavelength end of the second reflecting range is equal to or shorter than a wavelength at a longer wavelength end of the first reflecting range, and a wavelength at a longer wavelength end of the second reflecting range is at least 1100 nm. ### Claim 22 (depends on 19) The imaging device lens according to claim 19, wherein a wavelength at a shorter wavelength end of the second reflecting range is shorter than a wavelength at a longer wavelength end of the first reflecting range by from 20 to 100 nm. ### Claim 23 (depends on 19) The imaging device lens according to claim 19, wherein the full width at half maximum of the maximum absorption peak in the absorption spectrum of the near infrared ray absorbing dye (A1) is not more than 35 nm. ### Claim 24 (depends on 19) The imaging device lens according to claim 19, wherein in the absorption spectrum of the near infrared ray absorbing dye (A1), when calculated with the absorbance at the peak wavelength being 1, the value obtained by dividing the difference between the absorbance at 630 nm and the absorbance at the maximum absorption peak by the wavelength difference between 630 nm and the peak wavelength (nm) is from 0.010 to 0.014. ### Claim 25 (depends on 19) The imaging device lens according to claim 19, wherein a light transmittance of the near infrared ray absorbing layer at a wavelength in a range of from 695 to 720 nm is not more than 10%. ### Claim 26 An optical filter comprising: a near infrared ray absorbing layer which comprises: a near infrared ray absorbing dye (A); and a transparent resin (B), the near infrared ray absorbing dye (A) being dispersed in the transparent resin (B); and a selective wavelength shielding layer provided on one side or both sides of the near infrared ray absorbing layer, the selective wavelength shielding layer transmitting visible light therethrough and shielding near infrared light, wherein the near infrared ray absorbing dye (A) comprises a near infrared ray absorbing dye (A1), an absorption spectrum of the near infrared ray absorbing dye (A1) in a wavelength range of from 400 to 1,000 nm having a maximum absorption peak at a peak wavelength, wherein the absorption spectrum is measured in a state in which the near infrared ray absorbing dye (A1) is dissolved in a solvent for dye having a refractive index (n20d) of less than 1.500; the absorption spectrum of the near infrared ray absorbing dye (A1) satisfies conditions (a) and (b): (a) a full width at half maximum of the maximum absorption peak is not more than 60 nm; and (b) when calculated with an absorbance at the peak wavelength being 1, a value obtained by dividing a difference between an absorbance at 630 nm and an absorbance at the maximum absorption peak by a wavelength difference between 630 nm and the peak wavelength (nm) is from 0.010 to 0.050; the selective wavelength shielding layer comprises a first dielectric multilayered film and a second dielectric multilayered film, wherein the first dielectric multilayer film transmits visible light and has a first reflecting range in which near infrared light is reflected and a transmittance of the near infrared light is not more than 5%, and the second dielectric multilayer film transmits visible light in a wavelength range of from 420 to 695 nm, reflects ultraviolet light in a wavelength range of 400 nm or shorter, and has a second reflecting range in which near infrared light is reflected and a transmittance of the near infrared light is not more than 5%, wherein a wavelength at a shorter wavelength end of the second reflecting range is equal to or shorter than a wavelength at a longer wavelength end of the first reflecting range, and a wavelength at a longer wavelength end of the second reflecting range is at least 1100 nm; and the near infrared ray absorbing layer has a transmittance of visible light of from 450 to 600 nm of 70% or more, and an amount of change of transmittance (D) expressed by equation (1) of not more than −0.8: D(%/nm)=[T700(%)−T630(%)]/[700 (nm)−630 (nm)] (1) wherein in the equation (1), T700 is a transmittance at a wavelength of 700 nm in a transmission spectrum of the near infrared ray absorbing layer; and T630 is a transmittance at a wavelength of 630 nm in the transmission spectrum of the near infrared ray absorbing layer. ### Claim 27 (depends on 26) The optical filter according to claim 26, wherein the first dielectric multilayer film transmits visible light having a wavelength of from 420 to 695 nm therethrough, the near infrared ray absorbing layer has a near infrared ray absorbing range at wavelengths of 710 nm or greater in which a transmittance of light is not more than 5%, and a wavelength at a shorter wavelength end of the first reflecting range is equal to or shorter than a wavelength at a longer wavelength end of the near infrared ray absorbing range of the near infrared ray absorbing layer. ### Claim 28 (depends on 26) The optical filter according to claim 26, wherein a wavelength at a shorter wavelength end of the second reflecting range is shorter than a wavelength at a longer wavelength end of the first reflecting range by from 20 to 100 nm. ### Claim 29 (depends on 26) The optical filter according to claim 26, wherein the full width at half maximum of the maximum absorption peak in the absorption spectrum of the near infrared ray absorbing dye (A1) is not more than 35 nm. ### Claim 30 (depends on 26) The optical filter according to claim 26, wherein in the absorption spectrum of the near infrared ray absorbing dye (A1), when calculated with the absorbance at the peak wavelength being 1, the value obtained by dividing the difference between the absorbance at 630 nm and the absorbance at the maximum absorption peak by the wavelength difference between 630 nm and the peak wavelength (nm) is from 0.010 to 0.014. ### Claim 31 (depends on 26) The optical filter according to claim 26, wherein a light transmittance of the near infrared ray absorbing layer at a wavelength in a range of from 695 to 720 nm is not more than 10%. ### Claim 32 (depends on 26) The optical filter according to claim 26, wherein the near infrared ray absorbing dye (A1) comprises at least one member selected from squarylium compounds represented by formula (F1): wherein R1 and R2 are connected to each other to form ring A together with the nitrogen atom, ring A being a heterocyclic ring of a 5-membered or 6-membered ring which may contain an oxygen atom as a ring constituent atom, or R2 and R5 are connected to each other to form ring B together with the nitrogen atom, the carbon atom bonded to the nitrogen atom, and the carbon atom bonded to R5, ring B being a heterocyclic ring of a 5-membered or 6-membered ring which may contain an oxygen atom as a ring constituent atom; R1 that does not form ring A and R5 that does not form ring B each independently represent a hydrogen atom, a fluorine atom, a bromine atom, an alkyl group having from 1 to 6 carbon atoms which may have a substituent, an allyl group which may have a substituent, an aryl group having from 6 to 10 carbon atoms which may have a substituent, or an alaryl group having from 7 to 11 carbon atoms which may have a substituent; and the alkyl group having from 1 to 6 carbon atoms may be any of linear, branched or cyclic; each of R4 and R6 independently represents a hydrogen atom or —NR7R8, wherein each of R7 and R8 independently represents a hydrogen atom, an alkyl group having from 1 to 20 carbon atoms, or —C(═O)—R9, and R9 represents an alkyl group having from 1 to 20 carbon atoms or an aryl group having from 6 to 10 carbon atoms which may have a substituent; and each R3 independently represents a hydrogen atom or an alkyl group having from 1 to 6 carbon atoms. ### Claim 33 (depends on 26) The optical filter according to claim 26, wherein the near infrared ray absorbing dye (A) further comprises a near infrared ray absorbing dye (A2), an absorption spectrum of the near infrared ray absorbing dye (A2) in a wavelength range of from 400 to 1,000 nm having a maximum absorption peak at a peak wavelength, the absorption spectrum being measured in a state in which the near infrared ray absorbing dye (A2) is dissolved in a solvent having a refractive index (n20d) of less than 1.500, the absorption spectrum of the near infrared ray absorbing dye (A2) satisfying conditions (c) and (d): (c) the peak wavelength is in a range of more than 720 nm and not more than 800 nm; and (d) a full width at half maximum of the maximum absorption peak is not more than 100 nm. ### Claim 34 (depends on 33) The optical filter according to claim 33, wherein the near infrared ray absorbing dye (A2) comprises at least one member selected from cyanine compounds represented by formula (F2): wherein each R11 independently represents an alkyl group having from 1 to 20 carbon atoms, an alkoxy group, an alkylsulfone group, or an anion species thereof; each of R12 and R13 independently represents a hydrogen atom or an alkyl group having from 1 to 20 carbon atoms; Z represents PF6, ClO4, Rf—SO2, (Rf—SO2)2—N, or BF4, wherein Rf represents an alkyl group substituted with at least one fluorine atom; each of R14, R15, R16, and R17 independently represents a hydrogen atom, a halogen atom, or an alkyl group having from 1 to 6 carbon atoms; and n represents an integer of from 1 to 6. ### Claim 35 (depends on 26) The optical filter according to claim 26, wherein the transparent resin (B) comprises at least one member selected from the group consisting of an acrylic resin, an epoxy resin, an ene/thiol resin, a polycarbonate resin, and a polyester resin. ### Claim 36 (depends on 26) The optical filter according to claim 26, wherein in the near infrared ray absorbing layer, a proportion of the near infrared ray absorbing dye (A1) is from 3 to 100% by mass relative to the whole amount of the near infrared ray absorbing dye (A), and a proportion of the near infrared ray absorbing dye (A) is from 0.05 to 5 parts by mass based on 100 parts by mass of the transparent resin (B). ### Claim 37 (depends on 26) The optical filter according to claim 26, wherein the near infrared ray absorbing layer has a thickness of from 0.1 to 100 μm. ### Claim 38 (depends on 26) The optical filter according to claim 26, wherein the selective wavelength shielding layer comprises a dielectric multilayered film in which a low refractive index dielectric film and a high refractive index dielectric film are stacked alternately each other. ### Claim 39 (depends on 26) The optical filter according to claim 26, wherein the optical filter has a transmittance of visible light of from 420 to 620 nm being 70% or more, a transmittance of light in a wavelength range of from 710 to 860 nm being not more than 0.3%, and an amount of change of transmittance (Df) expressed by equation (2) being not more than −0.8: Df(%/nm)=[Tf700(%)−Tf630(%)]/[700 (nm)−630 (nm)] (2) wherein in the equation (2), Tf700 is a transmittance at a wavelength of 700 nm in a transmission spectrum of the optical filter; and Tf630 is a transmittance at a wavelength of 630 nm in the transmission spectrum of the optical filter. ### Claim 40 (depends on 26) The optical filter according to claim 26, further comprising a transparent base material, wherein the near infrared ray absorbing layer is provided directly or indirectly on the transparent base material, and the transparent base material is a colored glass sheet comprising CuO. ### Claim 41 (depends on 26) The optical filter according to claim 26, further comprising a transparent base material, wherein the near infrared ray absorbing layer is provided directly or indirectly on the transparent base material, and the transparent base material comprises a resin. ### Claim 42 (depends on 26) A solid-state imaging element comprising: a photoelectric conversion element; and the optical filter according to claim 26.