Abstract: A method for forming an optical coating comprising the steps of forming a fine-structure layer mainly composed of an inorganic metal oxide on the surface of an optical member, and then forming an inorganic, hard layer by a liquid-phase deposition method.

Abstract: A method for forming an anti-reflection coating of alkali-treated silica aerogel on a substrate, comprising the steps of hydrolyzing and polymerizing alkoxysilane in the presence of a base catalyst to prepare an alkaline sol, adding an acid catalyst to the alkaline sol to carry out further hydrolysis and polymerization to prepare a first acidic sol, hydrolyzing and polymerizing alkoxysilane in the presence of an acid catalyst to prepare a second acidic sol, mixing the first and second acidic sols, applying the resultant mixed sol to the substrate, drying it, and treating the resultant silica aerogel coating with an alkali.

Abstract: An optical low-pass filter is disposed on a light-receiving surface of an imaging device. The filter has a light-transmitting substrate including at least one birefringent plate and an infrared-cut plate , a dust-proofing layer provided on a light-input surface of the light-transmitting substrate, and an infrared-cut coat layer provided between the dust-proofing layer and the light-transmitting substrate or on a light-output surface of the light-transmitting substrate. A surface of the dust-proofing layer contains fine roughness.

Abstract: An anti-reflection coating comprising a mesoporous silica coating composed of mesoporous silica nano-particles formed on a substrate or a dense coating formed on the substrate, the mesoporous silica coating having a refractive index of more than 1.10 and 1.35 or less.

Abstract: A method for producing a silica aerogel film by hydrolyzing and polymerizing alkoxysilane in the presence of a base catalyst to prepare an alkaline sol, adding an acid catalyst to the alkaline sol to carry out further hydrolysis and polymerization to prepare a first acidic sol, hydrolyzing and polymerizing alkoxysilane in the presence of an acid catalyst to prepare a second acidic sol, applying a mixture of the first and second acidic sols to a substrate, and drying it.

Abstract: An anti-reflection coating laminated on a substrate, wherein in a wavelength range of 400-700 nm, the substrate has a refractive index of 1.45-1.72, the first layer is based on alumina, the second to sixth layers are dense layers having refractive indices of 1.95-2.23, 1.33-1.50, 2.04-2.24, 1.33-1.50 and 1.85-2.40, respectively, the seventh layer is composed of nanometer-sized, mesoporous silica particles, and the first to seventh layers have optical thicknesses of 25.0-250.0 nm, 27.5-52.5 nm, 37.5-54.0 nm, 45.0-62.5 nm, 77.5-102.5 nm, 16.0-26.5 nm and 112.5-162.5 nm, respectively.

Abstract: A method for forming an anti-reflection coating of alkali-treated silica aerogel on a substrate, comprising the steps of hydrolyzing and polymerizing alkoxysilane in the presence of a base catalyst to prepare an alkaline sol, adding an acid catalyst to the alkaline sol to carry out further hydrolysis and polymerization to prepare a first acidic sol, hydrolyzing and polymerizing alkoxysilane in the presence of an acid catalyst to prepare a second acidic sol, mixing the first and second acidic sols, applying the resultant mixed sol to the substrate, drying it, and treating the resultant silica aerogel coating with an alkali.

Abstract: A capsule endoscope has an outer cover including a transparent cover, a surface light emitting device, and a photographing optical system. The outer cover seals an inside space of the capsule endoscope. The light emitting device, which is disposed in the inside space of the capsule endoscope, emits light to an object through the transparent cover. The photographing optical system, which is disposed opposite to the transparent cover in the inside space, captures light reflected from the object which passes through the transparent cover.

Abstract: An anti-reflection coating comprising a mesoporous silica coating composed of mesoporous silica nano-particles formed on a substrate or a dense coating formed on the substrate, the mesoporous silica coating having a refractive index of more than 1.10 and 1.35 or less.

Abstract: A method for forming an optical coating comprising the steps of forming a fine-structure layer mainly composed of an inorganic metal oxide on the surface of an optical member, and then forming an inorganic, hard layer by a liquid-phase deposition method.

Abstract: A method for producing a silica aerogel film by hydrolyzing and polymerizing alkoxysilane in the presence of a base catalyst to prepare an alkaline sol, adding an acid catalyst to the alkaline sol to carry out further hydrolysis and polymerization to prepare a first acidic sol, hydrolyzing and polymerizing alkoxysilane in the presence of an acid catalyst to prepare a second acidic sol, applying a mixture of the first and second acidic sols to a substrate, and drying it.

Abstract: The finder optical system has a reflex mirror, a focal plane plate, a prism, an eyepiece, and a dust-proofing multilayer. The reflex mirror is disposed on an optical path of a photographing optical system. The focal plane plate is disposed at a position on which an image is formed by a light which passes through the photographing optical system and which is reflected by the reflex mirror. The light-input surface of the prism races a light-output surface of the focal plane plate. The eyepiece faces a light-output surface of the prism. The dust-proofing multilayer, which is provided on a surface of the focal plane plate, has a water-repellent or water- and oil-repellent layer and an anti-static layer.

Abstract: An optical low-pass filter is disposed on a light-receiving surface of an imaging device. The filter has a light-transmitting substrate including at least one birefringent plate and an infrared-cut plate , a dust-proofing layer provided on a light-input surface of the light-transmitting substrate, and an infrared-cut coat layer provided between the dust-proofing layer and the light-transmitting substrate or on a light-output surface of the light-transmitting substrate. A surface of the dust-proofing layer contains fine roughness.

Abstract: A polarized light emitting device has a planar emitting device, a phase-shift device, a polarizing reflecting device, and a reflecting device. The planar emitting device emits light from a front and back surfaces of the planar emitting device. The phase-shift device transmits the light emitted from said planar emitting device, and changes the polarization direction of the light. The polarizing reflecting device transmits or reflects the light according to the polarization of the light emitted from the front surface or transmitted by said phase-shift device. The reflecting device reflects the light emitted from the back surface or transmitted by said phase-shift device.

Abstract: A transparent display comprising a transmittance control block and a display block is provided. The transparent display transmits an optical image from a front surface to a back surface. The optical image is projected onto the front surface. A first image is displayed on the transparent display and superimposed onto the optical image. The transmittance control block is mounted to the front surface side. The transmittance control block comprises a guest-host liquid crystal layer and transparent electrodes. The transmittance of the light incident to the guest-host liquid crystal layer is able to be adjusted. The guest-host liquid crystal is mounted between the transparent electrodes. The display block is mounted to the back surface side. The display block comprises an organo-electroluminescence device. The first image is displayed on the display block.

Abstract: A transparent display comprising first and second transparent substrates first and second transparent electrodes, a polymer dispersed liquid crystal layer, and first and second light sources, is provided. The first and second transparent electrodes are mounted on the inside surfaces of the first and second transparent substrates. The inside surfaces of the first and second transparent substrates face each other. The polymer dispersed liquid crystal layer fills the gap between the first and second transparent electrodes. The polymer dispersed liquid crystal layer comprises a polymer material and a liquid crystal. The first and second light sources emit first and second light in predetermined directions, respectively. The predetermined directions are decided so that the first and second light are reflected at an outside surface.

Abstract: A luminescent display device is provided in a viewfinder device having a viewfinder window for observing an object. The luminescent display device has a substrate a first electrode, an organic layer arranged in sequence on or above the substrate. A sealing member is disposed above the substrate. The organic layer and the first and second electrodes are disposed in a sealed space between the sealing member and the substrate. An absorbent is disposed separately from the substrate within the sealed space, so that the organic layer is interposed between the substrate and the absorbent member.

Abstract: A capsule endoscope has an outer cover including a transparent cover, a surface light emitting device, and a photographing optical system. The outer cover seals an inside space of the capsule endoscope. The light emitting device, which is disposed in the inside space of the capsule endoscope, emits light to an object through the transparent cover. The photographing optical system, which is disposed opposite to the transparent cover in the inside space, captures light reflected from the object which passes through the transparent cover.

Abstract: A unit quantity of electricity is input to each pixel of a plurality of pixels according to image data so that the each pixel emits a predetermined light. The luminance of the predetermined light per unit quantity of electricity is smaller as electric resistance value of each pixel become larger. A high resistance pixel having a relatively high electric resistance value or a low resistance pixel having a relatively low electric resistance value is detected among the plurality of pixels. The unit quantity of electricity is adjusted for at least one of the high resistance pixel and the low resistance pixel.

Abstract: An EL device has an intermediate layer, one electrode layer, being one of an anode layer and a cathode layer, and an organic layer that are disposed on a substrate in sequence. The one electrode layer, the intermediate layer, and the substrate have light-transmitting properties. The organic layer emits light through the one electrode layer, the intermediate layer, and the substrate to outside the EL device. The refractive index of the intermediate layer is between a refractive index of the one electrode layer and a refractive index of the substrate.