Abstract: A lighting device that can switch between intensity distributions of emitted light with a simple configuration. The lighting device includes a light source, a polarization controller, and a polarizing plate, in which the polarization controller switches light emitted from the light source between light components having two or more different polarization states to be incident into the polarizing plate, and the polarizing plate functions as a diffraction grating that has two or more regions having different polarization states of transmitted light in an in-plane direction and where one or more regions among the regions are periodically disposed.

Abstract: An object of present invention is to provide an optical laminate that can be used for a reflective circular polarizer with little occurrence of a ghost in a case of being used in a virtual reality display device, an electronic finder, or the like; a laminated optical film including the reflective circular polarizer; an optical article including the optical laminate; and a virtual reality display device including the optical article.

Abstract: It is an object of the present invention to provide a projection image-displaying member having excellent suitability for polarizing sunglasses, a windshield glass, and a head-up display system. The projection image-displaying member has a first polarization converting layer, at least one selectively reflecting layer, and a second polarization converting layer in this order. The first polarization converting layer and the second polarization converting layer are layers formed by fixing a helical alignment structure of a liquid crystal compound. The number of pitches in the helical alignment structure and a film thickness satisfy all relational expressions below. When the first polarization converting layer has a number of pitches x1 and a film thickness y1 (unit: ?m), 0.3?x1?2.0 and??(i) y1?1.86x1+0.13.??(ii) When the second polarization converting layer has a number of pitches x2 and a film thickness y2 (unit: ?m), 0.25?x2?2.0,??(iii) y2?1.37x2+5.5, and??(iv) y2?1.37x2+0.25.

Abstract: An object is to provide a distance measurement device capable of receiving measurement light reflected by an object by responding to a wide angle range with a high S/N ratio. The object is achieved by the distance measurement device including: an infrared light source; a light receiving section that receives an infrared ray emitted from the light source and reflected by an object; and a band-pass filter (BPF) member that is disposed on a light-receiving surface side of the light receiving section and through which the infrared ray is transmitted, in which the BPF member includes a BPF and a refraction member that is disposed in contact with the BPF and refracts the infrared ray.

Abstract: Provided are an optical filter, an optical device, and a head-mounted display which have a high light transmittance in a front direction and a wide real field of view. The optical filter includes a first anisotropic absorption layer, a first retardation layer, and a second anisotropic absorption layer in this order, each of the first anisotropic absorption layer and the second anisotropic absorption layer contains a dichroic colorant, an absorption axis of the dichroic colorant is perpendicular to a main surface, and the first retardation layer has polar angle dependence of retardation that has asymmetry about a normal direction with respect to incident light hitting at least one incident surface including a normal of a layer surface of the first retardation layer.

Abstract: Provided are a projection image display member having a high visible light transmittance, suppressing a double image of a display image, and having excellent suitability of polarized sunglasses for incident light reflected from external light, a windshield glass using the projection image display member, and a head-up display system. The problem is solved such that one or more phase difference layers, one or more selective reflection layers, and one or more polarization conversion layers are provided in this order, the polarization conversion layer being a layer in which a helical alignment structure of a liquid crystal compound is fixed, and the number of pitches x of the helical alignment structure and a film thickness y (?m) of the polarization conversion layer satisfying “0.3?x?7.0”, “0.5?y?6.0”, “y?0.7x+3.2”, and “y?0.7x?1.4”.

Abstract: According to the present invention, it is possible to provide a wearable display device having good background visibility, a wide visual angle capable of viewing projected images, and a simple structure. The wearable display device includes at least a transparent screen and a projection device which projects an image on the transparent screen, in which a magnifying lens for viewing the image reflected from the transparent screen is disposed on a viewing side to cover at least a part of the transparent screen.

Abstract: Provided are a reflection film that can display videos in a case of being applied in a head-up display, and that can also compatible with various types of authentication such as face authentication and iris authentication performed with various infrared light sources, a windshield glass, and a head-up display system. The reflection film includes a visible light selective reflection layer and an infrared light selective reflection layer. The visible light selective reflection layer has at least one reflection peak in a range of 380 nm to 850 nm, and has a natural light reflectivity of 5% to 25% at a wavelength of the reflection peak. The infrared light selective reflection layer satisfies requirement 1 or requirement 2. Requirement 1: two or more reflection peaks are provided in a range of 900 nm to 1200 nm, and a natural light reflectivity each of the reflection peaks is 26% or more.

Abstract: Provided are a concentration measuring method of an optically active substance and a concentration measuring device of an optically active substance, which can easily and accurately measure a concentration of the optically active substance in aqueous humor.

Abstract: Provided are: a sensor that is used as a distance-measuring sensor or the like and where a high SN ratio can be obtained and high-accuracy measurement can be performed even in a case where an environmental temperature changes; and a band pass filter that is used for the sensor. The sensor includes: a light source; a band pass filter; and a light-receiving element, in which the band pass filter includes a band pass layer and a support that supports the band pass layer, and in a case where a thermal expansion coefficient of the band pass layer is represented by ?1, an elastic modulus of the band pass layer is represented by E1, a thermal expansion coefficient of the support is represented by ?2, and an elastic modulus of the support is represented by E2, ?1>?2 and E1<E2 are satisfied.

Abstract: A laminated glass, a method for producing a laminated glass, and a reflective film that has end parts where the generation of wrinkles is prevented in a case where the laminated glass is produced by sandwiching the reflective film between two glass plates and that has a reflection wavelength range with a small variation are provided. The reflective film has wavelength-selective reflectivity. A thermal shrinkage rate in a case where the reflective film is held at 140° C. for 30 minutes is greater than 0.5% and smaller than 2.0%. The reflective film has at least one cutout portion on a side edge of the reflective film.

Abstract: Provided are a bandpass filter having a high light transmittance in a transmission band and a wide wavelength range showing a high transmittance in the transmission band, and a sensor.

Abstract: An object of the present invention is to provide a half-mirror film for displaying a projection image having high adhesiveness, a laminated glass in which wrinkle generation of the half-mirror film is suppressed or furthermore has high adhesiveness, and an image display system using the laminated glass. The problem is solved by providing a half-mirror film for displaying a projection image including a transparent support; and a selective reflection layer reflecting light in a wavelength selective manner, in which the transparent support has an absolute value of 10 nm or less of an in-plane phase difference at a wavelength of 550 nm and a heat seal layer disposed on an opposite surface of a surface having the selective reflection layer, the heat seal layer contains a thermoplastic resin, and a mixed layer in which components of the transparent support and the heat seal layer are mixed is formed between the transparent support and the heat seal layer.

Abstract: Provided are a bandpass filter having a high light transmittance in a transmission band and a wide wavelength range showing a high transmittance in the transmission band, and a sensor.

Abstract: Provided are a decorative film including, in the following order, a temporary support, a colored layer, a cholesteric liquid crystal layer, and a protective layer, in which the decorative film is a film for viewing the colored layer through the cholesteric liquid crystal layer; a decoration method or a method for manufacturing a decorative molded article; and a decorative molded film including, in the following order, a base material, a colored layer, a cholesteric liquid crystal layer, and a protective layer, or including, in the following order, a colored layer, a cholesteric liquid crystal layer, a base material, and a protective layer, in which the decorative molded film is a film for viewing the colored layer through the cholesteric liquid crystal layer.

Abstract: Provided is an image display apparatus that has a small overall apparatus volume and can be miniaturized. The image display apparatus includes an image display element; a light guide plate on which light emitted by the image display element is incident and which internally and totally reflects the light satisfying a total reflection condition to guide the light; and a retroreflective element that is provided on a surface of the light guide plate and retroreflects the light guided in the light guide plate.

Abstract: Provided are an optical filter, an optical device, and a head-mounted display which have a high light transmittance in a front direction and a wide real field of view. The optical filter includes a first anisotropic absorption layer, a first retardation layer, and a second anisotropic absorption layer in this order, each of the first anisotropic absorption layer and the second anisotropic absorption layer contains a dichroic colorant, an absorption axis of the dichroic colorant is perpendicular to a main surface, and the first retardation layer has polar angle dependence of retardation that has asymmetry about a normal direction with respect to incident light hitting at least one incident surface including a normal of a layer surface of the first retardation layer.

Abstract: One embodiment of the invention is to provide a decorative film for molding including a reflective layer which is provided on a plastic base material and has a center wavelength of a selective reflection wavelength in a range of from 380 nm to 780 nm, in which an elastic modulus of the reflective layer at a temperature of a glass transition temperature (Tg) of the plastic base material +10° C. is from 0.00001 GPa to 0.5 GPa; a molded product of the decorative film for molding; and a display to which the molded product is applied.

Abstract: Provided is a display capable of displaying augmented reality (AR) in which background visibility is maintained and a hotspot is not visible. The display includes, at least: a transparent screen; a projection device for projecting a projection image on the transparent screen; and a sheet-shaped light guide plate for guiding the projection image, in which the projection device is disposed so that light of the projection image is incident from an end portion of the light guide plate, and the transparent screen is attached to at least one of main surfaces of the light guide plate.

Abstract: Display performance can be improved by reducing light leak in an oblique direction at the time of black display while increasing front brightness.