Abstract: A composition for infrared-absorbing layers according to the present invention includes: a compound formed by copper ion and a phosphonic acid represented by the following formula (a); and at least one of a phosphoric acid diester represented by the following formula (b1) and a phosphoric acid monoester represented by the following formula (b2). In the composition, fine particles containing at least the compound are dispersed. A content of the phosphonic acid is less than 2.5 times a total content of the phosphoric acid diester and the phosphoric acid monoester on a molar basis. R1 is an alkyl group with 2 to 4 carbon atoms, R21, R22, and R3 are each a monovalent functional group represented by —(CH2CH2O)nR4 wherein n is an integer of 1 to 25 and R4 is an alkyl group with 6 to 25 carbon atoms.

Abstract: An optical filter (1a) includes a light-absorbing layer and satisfies the following requirements (i) to (iii) when light with wavelengths of 300 nm to 1200 nm is incident at an incident angle of 0°: (i) an average transmittance of 78% or more in the wavelength range of 450 nm to 600 nm; (ii) a spectral transmittance of 1% or less in the wavelength range of 750 nm to 1080 nm; and (iii) a decreasing spectral transmittance with increasing wavelength in the wavelength range of 600 nm to 750 nm and a first IR cut-off wavelength in the wavelength range of 620 nm to 680 nm. The requirement (i), the requirement (ii), and the requirement (iii) are satisfied by the light-absorbing layer (10).

Abstract: An optical filter (1a) includes a UV-IR-absorbing layer and has the following characteristics (i) to (v) when light with wavelengths of 300 nm to 1200 nm is incident at an incident angle of 0°: (i) an average transmittance of 78% or more in the wavelength range of 450 nm to 600 nm; (ii) a spectral transmittance of 1% or less in the wavelength range of 750 nm to 1080 nm; (iii) a spectral transmittance of 1% or less in the wavelength range of 300 nm to 350 nm; (iv) a decreasing spectral transmittance with increasing wavelength in the wavelength range of 600 nm to 750 nm and a first IR cut-off wavelength in the wavelength range of 620 nm to 680 nm; and (v) an increasing spectral transmittance with increasing wavelength in the wavelength range of 350 nm to 450 nm and a first UV cut-off wavelength in the wavelength range of 380 nm to 430 nm.

Abstract: A UV-IR-absorbing composition according to the present invention includes: an absorber formed by a phosphonic acid represented by the following formula (a) and copper ion, the absorber being dispersed in the UV-IR-absorbing composition; a phosphoric acid ester allowing the absorber to be dispersed; a matrix resin; and an alkoxysilane monomer.

Abstract: A light-absorbing composition according to the present invention includes: a light absorber formed by a phosphonic acid represented by the following formula (a) and copper ion, the light absorber being dispersed in the light-absorbing composition; a phosphoric acid ester allowing the light absorber to be dispersed; and a curable resin. When the light-absorbing composition is applied and cured on one principal surface of a transparent dielectric substrate to form a laminate consisting of a light-absorbing layer being a cured product of the light-absorbing composition and the transparent dielectric substrate, the laminate satisfies predetermined requirements.

Abstract: An infrared-cut filter (1a) includes a near-infrared reflecting film (20) and an absorbing film (30). The near-infrared reflecting film (20) and the absorbing film (30) have the following features (A) to (E); (A) 700 nm??HR (0°, 70%)<?HR (0°, 20%)?770 nm; (B) 650 nm??HR (40°, 70%)<?HR (40°, 20%)?720 nm; (C) ?HA (40°, 20%)<?HR (40°, 20%); (D) the spectral transmittance of light incident on the absorbing film (30) is 15% or less at ?HR (0°, 20%) and ?HR (40°, 20%); and (E) an average of the spectral transmittance of light incident on the near-infrared reflecting film (20) and an average of the spectral transmittance of light incident on the absorbing film (30) are 75% or more in the wavelength range of 450 to 600 nm.

Abstract: A composition for infrared-absorbing layers according to the present invention includes: a compound formed by copper ion and a phosphonic acid represented by the following formula (a); and at least one of a phosphoric acid diester represented by the following formula (b1) and a phosphoric acid monoester represented by the following formula (b2). In the composition, fine particles containing at least the compound are dispersed. A content of the phosphonic acid is less than 2.5 times a total content of the phosphoric acid diester and the phosphoric acid monoester on a molar basis. R1 is an alkyl group with 2 to 4 carbon atoms, R21, R22, and R3 are each a monovalent functional group represented by —(CH2CH2O)nR4 wherein n is an integer of 1 to 25 and R4 is an alkyl group with 6 to 25 carbon atoms.

Abstract: An infrared-absorbing composition according to the present invention includes: an infrared absorber formed by a phosphonic acid represented by the following formula (a) and copper ion; and a phosphoric acid ester allowing the infrared absorber to be dispersed. The phosphoric acid ester includes at least one of a phosphoric acid diester and a phosphoric acid monoester. R1 is a phenyl group or a phenyl group in which at least one hydrogen atom is substituted by a halogen atom. When molar contents of the phosphonic acid, the copper ion, and the phosphoric acid ester are respectively defined as CA mol, CC mol, and CE mol and a total molar content of reactive hydroxy groups is defined as CH mol, the relations CA/CE<1 and CH/CC>1.95 are satisfied.

Abstract: The infrared cut filter of the present invention includes an organic dye-containing layer and a copper phosphonate-containing layer containing fine particles of copper phosphonate. The organic dye-containing layer contains an organic dye so as to have a spectral transmittance that decreases from 70% or more to 50% or less with increasing wavelength in a wavelength range between a wavelength 50 nm shorter than a cut-off wavelength of the infrared cut filter and a wavelength 50 nm longer than the cut-off wavelength of the infrared cut filter.

Abstract: An infrared cut filter includes: a transparent dielectric substrate; an infrared reflecting layer formed on one surface of the transparent dielectric substrate and configured to reflect infrared light; and an infrared absorbing layer formed on the other surface of the transparent dielectric substrate and configured to absorb infrared light. The infrared absorbing layer is formed by encapsulating infrared absorbing pigment in a matrix containing silica, formed by a sol-gel method, as a main component.

Abstract: An infrared cut filter includes: a transparent dielectric substrate; an infrared reflecting layer formed on one surface of the transparent dielectric substrate and configured to reflect infrared light; and an infrared absorbing layer formed on the other surface of the transparent dielectric substrate and configured to absorb infrared light. The infrared absorbing layer is formed by encapsulating infrared absorbing pigment in a matrix containing silica, formed by a sol-gel method, as a main component.

Abstract: Disclosed is a debris filter capable of reducing a pressure loss of coolant as it flows and capturing debris in the coolant. The debris filter includes bent plates, first plates, and second plates, all having respective same shapes, wherein each of the bent plates is composed of a first inclined strip-like plate and a second inclined strip-like plate. The bent plates are arranged parallel with each other, the bent plates and the first plates are fixed with each other so that the first plates intersect each first inclined plate, the bent plates and the second plates are fixed with each other so that the second plates intersect each second inclined plate, and the first plates does not touch the second plates.

Abstract: In a reference specimen for a microscope, for use in calibration or inspection of a microscope, having an uneven structure in which convex portions having a prescribed height or concave portions having a prescribed depth are arrayed in a prescribed cycle on a substrate surface, as a material forming the uneven structure, a hydrolytically cured product of a metal alkoxide, or a cured product of an epoxy resin or an acrylic resin is used. The fine uneven structure is manufactured in the following manner. It is transferred by pressing a master plate against a molding material coated on a substrate, and cured, followed by release.