Abstract: An optical element having a substrate and a light-shielding film on part of an outer portion of the substrate further contains a coating on the light-shielding film, the coating containing a cured mixture of a melamine or benzoguanamine resin, and a phenolic resin, in proportions by mass of 1:5 to 7:5.

Abstract: The optical member according to the present invention includes a film containing a plurality of chain particles and having a refractive index of 1.21 or more and 1.27 or less at a wavelength of 550 nm on a substrate. The film includes an alcohol having an ether bond or an ester bond and having a branched structure having 4 to 7 carbon atoms in a range of 1.0 mg/cm3 or more and 2.8 mg/cm3 or less.

Abstract: There is provided an optical member including a porous layer on a substrate, wherein the porous layer contains silicon oxide particles, a silicon oxide binder, and a fluorine compound having a fluorocarbon group and a nonionic hydrophilic group, and the amount of the fluorine compound is 0.1% by mass or more and 2.5% by mass or less with respect to the silicon oxide.

Abstract: An optical member includes a base material and an antireflective layer on the base material wherein the antireflective layer includes a plurality of fine protrusions on a surface thereof and a support layer for supporting the protrusions, and the support layer contains boron in an amount of 7×1019 atoms/cm3 or more and 2.5×1020 atoms/cm3 or less.

Abstract: An optical member includes a base material and an antireflective layer on the base material wherein the antireflective layer includes a plurality of fine protrusions on a surface thereof and a support layer for supporting the protrusions, and the support layer contains boron in an amount of 7×1019 atoms/cm3 or more and 2.5×1020 atoms/cm3 or less.

Abstract: A method for manufacturing an optical member includes a step of applying a dispersion liquid containing particles and a dispersion medium on a substrate, a step of applying a solution containing a component to form a binder after the step of applying the dispersion liquid, and causing the solution to permeate a portion between the particles contained in the dispersion liquid applied in advance to form a single layer in which the portion between the particles is filled with the binder, and a step of drying the layer to prepare an antireflection film. The solution contains a silane-alkoxy condensate having an average particle diameter of 8 nm or more and 60 nm or less, and the solution contains a solvent having solubility of water of 10% by weight or less in an amount of 70% by mass or more.

Abstract: The present invention provides an optical member having an antireflection effect and environmental reliability and a manufacturing method thereof. The optical member includes a laminated body formed on a surface of a substrate, and the laminated body includes a porous layer or a layer having an uneven structure as a surface layer, a first organic resin layer containing a polymer having an aromatic ring and/or an imide ring in its main chain as a primary component, and a second organic resin layer containing a polymaleimide or a copolymer thereof as a primary component, the first organic resin layer and the second organic resin layer being provided in this order from the substrate to the surface layer.

Abstract: An optical member includes a laminated body configured to reduce light reflection disposed on a substrate, wherein a surface of the laminated body is a porous layer or a layer having a textured structure, and at least one layer of the laminated body is a polymer layer containing a linear polymer and a branched polymer. A method for manufacturing the optical member is also provided. The branched polymer content is 10% by weight or more and 90% by weight or less of the total weight of the linear polymer and the branched polymer. The layer having a textured structure contains crystals mainly composed of aluminum oxide.

Abstract: An optical member includes a substrate and an antireflection film on the substrate. The antireflection film includes a porous layer at the surface thereof. The porous layer contains silicon oxide particles and a binder. The porous layer is provided with a fluororesin on at least part of the surface of the porous layer. The contact angle of n-hexadecane on the surface of the antireflection film is in the range of 50° to 80°.

Abstract: A precursor sol of aluminum oxide contains a polycondensate formed by the hydrolysis of an aluminum alkoxide or an aluminum salt, a solvent, and an organic aluminum compound having a specific structure. An optical member is produced by a process including a step of immersing an aluminum oxide film in a hot water with a temperature of 60° C. to 100° C. to form a textured structure made of aluminum oxide crystals, the aluminum oxide film being formed by feeding the precursor sol of aluminum oxide onto a base. A method for producing an optical member includes a step of immersing an aluminum oxide film in a hot water with a temperature of 60° C. to 100° C. to form a textured structure made of aluminum oxide crystals, the aluminum oxide film being formed by feeding the precursor sol of aluminum oxide onto a base.

Abstract: A precursor sol of aluminum oxide contains a polycondensate formed by the hydrolysis of an aluminum alkoxide or an aluminum salt, a solvent, and an organic aluminum compound having a specific structure. An optical member is produced by a process including a step of immersing an aluminum oxide film in a hot water with a temperature of 60° C. to 100° C. to form a textured structure made of aluminum oxide crystals, the aluminum oxide film being formed by feeding the precursor sol of aluminum oxide onto a base. A method for producing an optical member includes a step of immersing an aluminum oxide film in a hot water with a temperature of 60° C. to 100° C. to form a textured structure made of aluminum oxide crystals, the aluminum oxide film being formed by feeding the precursor sol of aluminum oxide onto a base.

Abstract: An optical member including a base material and an antireflection film on the base material, wherein the antireflection film has a porous layer as the surface, the porous layer contains silicon oxide particles and a binder, the porous layer has a refractive index of 1.19 or more and 1.30 or less, and the surfaces of the silicon oxide particles and the binder have alkylsilyl groups.

Abstract: An optical element having a substrate and a light-shielding film on part of an outer portion of the substrate further contains a coating on the light-shielding film, the coating containing a cured mixture of a melamine or benzoguanamine resin, and a phenolic resin, in proportions by mass of 1:5 to 7:5.

Abstract: A precursor sol of aluminum oxide includes particles containing a hydrolysate and/or a condensate of an aluminum compound, a solvent, and an organo aluminum compound. When a pulsed-NMR T2 relaxation curve of nuclide 1H of the precursor sol of aluminum oxide includes two components with different T2 relaxation times and the component with the longer T2 relaxation time has an abundance level of CL (%) and the component with the shorter T2 relaxation time has an abundance level of CS (%), the relative proportion RCS (%) defined by [{CS/(CS+CL)}×100] is in the range of 23.5% to 50.0%, both inclusive.

Abstract: This invention provides an optical member having a high antireflection effect also on a base material with a low refractive index. This invention relate to an optical member in which a laminated body is formed on a base material surface, in which the laminated body has a porous layer or a layer having an uneven structure on the surface and having a polymer layer has a thickness of 10 nm or more and 150 nm or less and containing a maleimide copolymer between the porous layer or the layer having an uneven structure and the base material.

Abstract: There is provided an optical member that can retain a high antireflection effect on a substrate for a long time. The optical member includes a laminated body that can reduce the reflection of light formed on a substrate surface, wherein at least one layer of the laminated body is a polyimide layer containing a polyimide film, and the polyimide contains a repeating unit represented by the following general formula (1), and a 1,4-cyclohexylene group in the main chain of R2 in the general formula (1) contains 90% by mole or more of a trans-1,4-cyclohexylene group: wherein R1 denotes a tetravalent organic group, and R2 denotes a divalent organic group having one or two or more 1,4-cyclohexylene groups in the main chain.

Abstract: There is provided an optical member that can retain a high antireflection effect on a substrate for a long time. The optical member includes a laminated body that can reduce the reflection of light formed on a substrate surface, wherein at least one layer of the laminated body is a polyimide layer containing a polyimide film, and the polyimide contains a repeating unit represented by the following general formula (1), and a 1,4-cyclohexylene group in the main chain of R2 in the general formula (1) contains 90% by mole or more of a trans-1,4-cyclohexylene group: wherein R1 denotes a tetravalent organic group, and R2 denotes a divalent organic group having one or two or more 1,4-cyclohexylene groups in the main chain.

Abstract: Provided is an optical member where at least a layer having polyimide as a main component and a layer having a textured structure arising from a crystal containing aluminum oxide as a main component are stacked in this order. The polyimide includes a silane group in a side chain via an amide bond.

Abstract: An optical element includes an optically effective area and an optically ineffective area partly or entirely coated with a coating opaque at wavelengths used. The opaque coating contains a cured product prepared from an epoxy resin and a curing agent containing an alicyclic acid anhydride. The alicyclic acid anhydride is preferably methylhexahydrophthalic anhydride or hexahydrophthalic anhydride.

Abstract: An optical member includes a ray effective area, a ray ineffective area, at least one continuous protective film arranged over the ray effective area and at least part of the ray ineffective area, a light-shielding film arranged on the protective film located in the ray ineffective area, and a plate-crystal film arranged on the protective film located in the ray effective area, the plate-crystal film including mainly aluminum oxide and having a textured structure on a surface thereof, and an optical system includes the optical member.