Abstract: An optical filter includes a first dielectric multilayer film, a resin film, a phosphate glass, and a second dielectric multilayer film. The second dielectric multilayer film includes at least one H2 layer satisfying a refractive index of 1.8 or more and 2.5 or less and a QWOT of 1.1 or more and 3.5 or less, when a layer closest to the phosphate glass in the H2 layers is defined as a first H2 layer, the second dielectric multilayer film comprises a first M2 layer comprising a single layer satisfying a QWOT of 1.2 or more and 1.8 or less or a plurality of layers satisfying a total QWOT of 1.2 or more and 1.8 or less between the first H2 layer and the phosphate glass, and the optical filter satisfies all of the spectral characteristics (i-1) to (i-4).

Abstract: Optical filter-type glass contains a P component, a Cu component, and Mo component, is substantially free of F, and includes: in mass % on an oxide basis, 60% to 75% of P2O5; 9% to 16.5% of Al2O3; 4% to 20% of ?R2O, where R2O is one or more components selected from Li2O, Na2O, K2O, Rb2O, and Cs2O, and ?R2O is a total amount of R2O; 0% to 8% of ?R?O, where R?O is one or more components selected from CaO, MgO, BaO, SrO, and ZnO, and ?R?O is a total amount of R?O; more than 7% up to 20% of CuO; and 0.01% to 1.18% of MoO3.

Abstract: An optical filter includes a first dielectric multilayer film, a resin film, a phosphate glass, and a second dielectric multilayer film. The second dielectric multilayer film includes at least one H2 layer satisfying a refractive index of 1.8 or more and 2.5 or less and a QWOT of 1.1 or more and 3.5 or less, when a layer closest to the phosphate glass in the H2 layers is defined as a first H2 layer, the second dielectric multilayer film comprises a first M2 layer comprising a single layer satisfying a QWOT of 1.2 or more and 1.8 or less or a plurality of layers satisfying a total QWOT of 1.2 or more and 1.8 or less between the first H2 layer and the phosphate glass, and the optical filter satisfies all of the spectral characteristics (i-1) to (i-4).

Abstract: A near-infrared cut filter glass has: an average transmittance in a wavelength range of 400-550 nm of 50-92%; a transmittance at a wavelength of 700 nm of 40-92%; an average transmittance in a wavelength range of 850-950 nm of 0.0001-70%; and an average transmittance in a wavelength range of 1200-2500 nm of 0.0001-60%.

Abstract: An optical filter includes a dielectric multilayer film 1, a resin film, a phosphate glass, and a dielectric multilayer film 2 in this order. The resin film includes a resin and a near-infrared ray absorbing dye having a maximum absorption wavelength in 690 nm to 800 nm in the resin, the resin film has a thickness of 10 ?m or less, and the optical filter satisfies all of the spectral characteristics (i-1) to (i-5).

Abstract: An optical filter satisfies: (i-1) an average transmittance T450-600(0deg)AVE is 90% or more, (i-2) an average transmittance T550-650(0deg)AVE is 70% or more, (i-3) an average transmittance T550-650(60deg)AVE is 50% or more, (i-4) an average transmittance T700-750(0deg)AVE is 5% or less, (i-5) in a wavelength of 500 nm to 700 nm, an absolute value of a difference between a wavelength IR80(0deg) and a wavelength IR20(0deg) is 90 nm or less, (i-6) in a wavelength of 500 nm to 700 nm, a wavelength IR50(0deg) and a wavelength IR50(60deg) are both in a wavelength region of 600 nm to 660 nm, and an absolute value of a difference between the wavelength IR50(0deg) and the wavelength IR50(60deg) is 30 nm or less, (i-7) an average transmittance T800-1200(0deg)AVE is 15% or less, and (i-8) an average transmittance T1200-1700(0deg)AVE is 50% or less.

Abstract: An optical filter includes a dielectric multilayer film 1, a resin film, a phosphate glass, and a dielectric multilayer film 2 in this order. The resin film includes a resin and a near-infrared ray absorbing dye having a maximum absorption wavelength in 690 nm to 800 nm in the resin, the resin film has a thickness of 10 ?m or less, and the optical filter satisfies all of the spectral characteristics (i-1) to (i-8).

Abstract: A glass for an optical filter, the glass being a phosphate glass including Cu, in which the glass has: an average transmittance of 80% or more at a wavelength of 430 nm to 550 nm; an average transmittance of 2% or less at a wavelength of 800 nm to 950 nm; an average transmittance of 3% or less at a wavelength of 1000 nm to 1200 nm; an average transmittance of 5% or less at a wavelength of 700 nm to 1200 nm; a transmittance of 25% or more at a wavelength of 1550 nm; and a wavelength at which a transmittance is 50% of 615 nm or more in a wavelength range of 600 nm to 800 nm.

Abstract: An optical filter includes: a substrate, an antireflection layer 1 including a dielectric multilayer film laminated on one main surface side of the substrate, and an antireflection layer 2 including a dielectric multilayer film laminated on the other main surface side of the substrate. The substrate includes a near-infrared ray absorbing glass and a resin film, the resin film includes a resin, a UV dye having a maximum absorption wavelength in 350 nm to 410 nm in the resin, and an IR dye having a maximum absorption wavelength in 700 nm to 850 nm in the resin, and the optical filter satisfies all of the characteristics (i-1) to (i-7).

Abstract: A glass contains ytterbium and has a transmittance of 30% or less for light having a wavelength of 940 nm in terms of a thickness of 0.4 mm. The glass may have a transmittance of 78% or more for light having a wavelength of 850 nm in terms of a thickness of 0.4 mm.

Abstract: An optical filter includes: a dielectric multilayer film 1; a substrate comprising a near-infrared ray absorbing glass and a resin film; and a dielectric multilayer film 2 in this order. The resin film comprises a near-infrared ray absorbing dye and a resin, the near-infrared ray absorbing glass is a fluorophosphate glass containing P, Cu, and F, and the optical filter satisfies all of the spectral characteristics (i-1) to (i-3), (i-5), and (i-13).

Abstract: An optical filter includes a glass substrate having a first main surface and a second main surface opposite each other and including phosphoric acid glass, a first antireflective layer disposed directly or indirectly on the first main surface of the glass substrate, and a resin layer, containing dye, disposed as one or more layers directly or indirectly on the second main surface of the glass substrate, wherein the glass substrate includes a predetermined range of amount of oxides, wherein the dye has a maximum absorption wavelength in the resin layer at a wavelength range of 690 to 800 nm, wherein thickness of the resin layer is 10 ?m or less, wherein the optical filter has all spectral characteristics specified in (a-1) to (a-6), and wherein a Haze value of the optical filter is 2% or less.

Abstract: An optical filter includes a glass substrate having a first main surface, a second main surface opposite the first main surface, and an end surface connecting the first and second main surfaces, the glass substrate being a phosphate glass containing an absorbent, and a first antireflection layer disposed directly or indirectly on the first main surface of the glass substrate, wherein the first main surface of the glass substrate is coated with a first inorganic film, and a second inorganic film is provided directly or indirectly on the second main surface of the glass substrate, with the end surface being coated with a third inorganic film, and wherein the first inorganic film is a film that is closest to the glass substrate among films constituting the first antireflection layer, or a film that is different from a film composed of a plurality of films constituting the first antireflection layer.

Abstract: A glass for an optical filter, the glass being a phosphate glass including Cu, in which the glass has: an average transmittance of 80% or more at a wavelength of 430 nm to 550 nm; an average transmittance of 2% or less at a wavelength of 800 nm to 950 nm; an average transmittance of 3% or less at a wavelength of 1000 nm to 1200 nm; an average transmittance of 5% or less at a wavelength of 700 nm to 1200 nm; a transmittance of 25% or more at a wavelength of 1550 nm; and a wavelength at which a transmittance is 50% of 615 nm or more in a wavelength range of 600 nm to 800 nm.

Abstract: An optical filter includes: an absorber including an inorganic material including ytterbium; an absorption layer including a dye and a resin, the dye having a maximum absorption wavelength between 350 nm and 1,200 nm; and a dielectric multilayer film. The absorber may have a flat plate shape, and the absorber may have a thickness of 3 mm or less.

Abstract: The present invention pertains to an optical filter including: a light-absorbing material Y900-1000 having a maximum absorption wavelength in a wavelength region of 900 nm to 1,000 nm, and a dielectric multilayer film, in which the optical filter satisfies all of spectral characteristics (i-1) to (i-6), and the optical filter may satisfy spectral characteristic (i-7).

Abstract: An optical filter includes: a light-absorbing material X800S having a maximum absorption wavelength in a wavelength region shorter than 800 nm; a light-absorbing material Y850L having a maximum absorption wavelength in a wavelength region longer than 850 nm; and a dielectric multilayer film, in which the optical filter satisfies spectral characteristics (i-1) to (i-5).

Abstract: A glass for an optical filter, the glass being a phosphate glass including Cu, in which the glass has: an average transmittance of 80% or more at a wavelength of 430 nm to 550 nm; an average transmittance of 2% or less at a wavelength of 800 nm to 950 nm; an average transmittance of 3% or less at a wavelength of 1000 nm to 1200 nm; an average transmittance of 5% or less at a wavelength of 700 nm to 1200 nm; a transmittance of 25% or more at a wavelength of 1550 nm; and a wavelength at which a transmittance is 50% of 615 nm or more in a wavelength range of 600 nm to 800 nm.

Abstract: Optical filter-type glass contains a P component, a Cu component, and Mo component, is substantially free of F, and includes: in mass % on an oxide basis, 60% to 75% of P2O5; 9% to 16.5% of Al2O3; 4% to 20% of ?R2O, where R2O is one or more components selected from Li2O, Na2O, K2O, Rb2O, and Cs2O, and ?R2O is a total amount of R2O; 0% to 8% of ?R?O, where R?O is one or more components selected from CaO, MgO, BaO, SrO, and ZnO, and ?R?O is a total amount of R?O; more than 7% up to 20% of CuO; and 0.01% to 1.18% of MoO3.

Abstract: A near-infrared cut filter includes a transparent substrate having a first and a second surfaces, opposite to each other; and a dielectric multilayer film disposed on a side of the first surface. The dielectric multilayer film reflects light within a wavelength range of 700-750 nm. A mean regular transmittance T1 within a wavelength range of 700-750 nm measured when light is incident in the normal direction from the side of the second surface is 20% or less. A mean regular transmittance T2 within a wavelength range of 600-680 nm measured when light is incident in the normal direction from the side of the second surface is 65% or more. A mean regular reflectance R1 within a wavelength range of 700-750 nm measured when light is incident at an angle of 5° with respect to the normal direction from the side of the second surface is 80% or less.