Abstract: To suppress, in an optical body in which a microlens array as a non-periodic structure is arranged and deployed in a wide range, occurrence of periodic optical properties in a structural unit larger than the non-periodic structure. The optical body includes a single non-periodic structure region or a collection of a plurality of non-periodic structure regions, the non-periodic structure region being composed of a single lens group including a plurality of single lenses. In the non-periodic structure region, a located state of the single lens group is non-periodic as a whole. A ratio of a size of the non-periodic structure region to an average aperture diameter of the single lenses in the non-periodic structure region is more than or equal to 25.

Abstract: An optical body including: a first optical layer which has a surface having a convex profile in which a plurality of one-directionally extending elongated convex portions are one-dimensionally aligned in one direction; an inorganic layer disposed on the surface of the first optical layer on a side having the convex profile and a second optical layer disposed on a side of the inorganic layer so that the convex profile is embedded; wherein the convex profile meets at least one of the following (1) to (4): (1) a height varies in an extending direction in each of the elongated convex portions, (2) a ridge portion meanders in a direction perpendicular to both the extending direction and a height direction of the convex portion in each of the elongated convex portions, (3) heights of the elongated convex portions adjacent to each other are different from each other, and (4) a triangular prism-shaped convex portion and an elongated convex portion having a curved surface are adjacent to each other.

Abstract: There is provided a reflective diffuser plate to achieve more uniform diffusion angle distribution properties. The reflective diffuser plate is a microlens array reflective diffuser plate including a single lens group positioned on a surface of a transparent base material. There are variations in aperture diameter and radius of curvature that respective single lenses constituting the single lens group have in the single lens group as a whole, and vertex positions of the respective single lenses are located irregularly. A luminance distribution of reflected light of light vertically incident on the single lens group is substantially uniform in a predetermined diffusion angle range. For at least light incident on the single lens group from certain directions, a relation of 0.3?A/B?1 holds where A represents a reflection luminance value in the surface normal direction, and B represents a peak reflection luminance value of a diffuse reflection component.

Abstract: There is provided a reflective diffuser plate to achieve more uniform diffusion angle distribution properties. The reflective diffuser plate is a microlens array reflective diffuser plate including a single lens group positioned on a surface of a transparent base material. There are variations in aperture diameter and radius of curvature that respective single lenses constituting the single lens group have in the single lens group as a whole, and vertex positions of the respective single lenses are located irregularly. A luminance distribution of reflected light of light vertically incident on the single lens group is substantially uniform in a predetermined diffusion angle range. For at least light incident on the single lens group from certain directions, a relation of 0.3 A/B 1 holds where A represents a reflection luminance value in the surface normal direction, and B represents a peak reflection luminance value of a diffuse reflection component.

Abstract: There is provided a diffuser plate, a display device, a projection device, and a lighting device that can achieve more even diffusion angle distribution properties, the diffuser plate being of a microlens array type, and including: a single lens group located on a surface of a transparent base material, in which aperture sizes and radii of curvatures of respective single lenses constituting the single lens group vary in the single lens group as a whole, and vertex positions of the respective single lenses are located irregularly, and energy distribution of light that transmits through the single lens group is substantially even in a predetermined diffusion angle range.

Abstract: An optical body includes a first optical transparent layer having quadrangular pyramid-shaped depressions, a wavelength-selective reflecting layer formed on the depressions and selectively reflecting light of a specific wavelength band, and a second optical transparent layer formed on the wavelength-selective reflecting layer. When (?, ?) is taken as the incident angle (?: angle between perpendicular line relative to second optical transparent layer acting as incident surface and light incident on incident surface; ?: angle between specific straight line within incident surface and component resulting from projection of incident light on incident surface), with respect to incident light that is incident on the incident surface from different ? directions at ?=60°, the optical body has an average reflection angle of reflected light to the same quadrant as the incident light of 30° or more.

Abstract: An optical body including: a first optical layer which has a surface having a convex profile in which a plurality of one-directionally extending elongated convex portions are one-dimensionally aligned in one direction; an inorganic layer disposed on the surface of the first optical layer on a side having the convex profile and a second optical layer disposed on a side of the inorganic layer so that the convex profile is embedded; wherein the convex profile meets at least one of the following (1) to (4): (1) a height varies in an extending direction in each of the elongated convex portions, (2) a ridge portion meanders in a direction perpendicular to both the extending direction and a height direction of the convex portion in each of the elongated convex portions, (3) heights of the elongated convex portions adjacent to each other are different from each other, and (4) a triangular prism-shaped convex portion and an elongated convex portion having a curved surface are adjacent to each other.

Abstract: To suppress, in an optical body in which a microlens array as a non-periodic structure is arranged and deployed in a wide range, occurrence of periodic optical properties in a structural unit larger than the non-periodic structure. The optical body includes a single non-periodic structure region or a collection of a plurality of non-periodic structure regions, the non-periodic structure region being composed of a single lens group including a plurality of single lenses. In the non-periodic structure region, a located state of the single lens group is non-periodic as a whole. A ratio of a size of the non-periodic structure region to an average aperture diameter of the single lenses in the non-periodic structure region is more than or equal to 25.

Abstract: An optical body includes a first optical transparent layer having quadrangular pyramid-shaped depressions, a wavelength-selective reflecting layer formed on the depressions and selectively reflecting light of a specific wavelength band, and a second optical transparent layer formed on the wavelength-selective reflecting layer. When (?, ?) is taken as the incident angle (?: angle between perpendicular line relative to second optical transparent layer acting as incident surface and light incident on incident surface; ?: angle between specific straight line within incident surface and component resulting from projection of incident light on incident surface), with respect to incident light that is incident on the incident surface from different ? directions at ?=60°, the optical body has an average reflection angle of reflected light to the same quadrant as the incident light of 30° or more.

Abstract: An optical element is provided includes an optical layer having a flat incident surface on which light is incident and a wavelength-selective reflective layer disposed in the optical layer. Of light incident on the incident surface at an incident angle (?, ?), the optical element selectively directionally reflects light in at least one specific wavelength range in at least one direction other than a specular reflection direction (??, ?+180°) while transmitting light in at least one wavelength range other than the specific wavelength range, and is transparent to light in at least one wavelength range other than the specific wavelength range.

Abstract: An optical element is provided includes an optical layer having a flat incident surface on which light is incident and a wavelength-selective reflective layer disposed in the optical layer. Of light incident on the incident surface at an incident angle (?, ?), the optical element selectively directionally reflects light in at least one specific wavelength range in at least one direction other than a specular reflection direction (??, ?+180°) while transmitting light in at least one wavelength range other than the specific wavelength range, and is transparent to light in at least one wavelength range other than the specific wavelength range.

Abstract: There is provided a diffuser plate, a display device, a projection device, and a lighting device that can achieve more even diffusion angle distribution properties, the diffuser plate being of a microlens array type, and including: a single lens group located on a surface of a transparent base material, in which aperture sizes and radii of curvatures of respective single lenses constituting the single lens group vary in the single lens group as a whole, and vertex positions of the respective single lenses are located irregularly, and energy distribution of light that transmits through the single lens group is substantially even in a predetermined diffusion angle range.

Abstract: An optical member, which includes: a first optical transparent layer having convex-concave shapes, and being transparent to visible light; a wavelength-selective reflective layer, which is formed on the convex-concave shapes of the first optical transparent layer, and is configured to selectively reflect certain wavelengths of infrared light; and a second optical transparent layer formed on the wavelength-selective reflective layer, wherein the wavelength-selective reflective layer includes at least an amorphous high-refractive-index layer, a metal layer, and a crystalline high-refractive-index layer in contact with the second optical transparent layer.

Abstract: An optical element is provided with an optical layer in which a concavo-convex surface is formed on the surface thereof, and a wavelength-selective reflection layer formed on the concavo-convex surface. The wavelength-selective reflection layer directionally reflects light having a specific wavelength band selectively, while transmitting light having wavelength bands other than the specific wavelength band. The concavo-convex surface is provided with a plurality of first structural elements that are extended in a first direction within the surface of the optical layer and a plurality of second structural elements that are extended in a second direction within the surface of the optical layer, and placed to be spaced apart from each other, with the first direction and the second direction intersecting with each other.

Abstract: Provided is an optical member including: an optical layer including a first optical layer having a surface with a concave-convex shape, a reflective layer disposed on the surface with the concave-convex shape of the first optical layer, and a second optical layer disposed on the reflective layer; a first transparent substrate disposed on a side of the first optical layer included in the optical layer; and a second transparent substrate disposed on a side of the second optical layer included in the optical layer. The reflective layer is configured to reflect near-infrared light, and the first transparent substrate and the second transparent substrate are made of a same material. The optical member has a total thickness of not more than 125 ?m, a breaking strength of not less than 100 N, and a break elongation both before and after a weatherability test of not less than 60%.

Abstract: An optical member, which includes: a first optical transparent layer having convex-concave shapes, and being transparent to visible light; a wavelength-selective reflective layer, which is formed on the convex-concave shapes of the first optical transparent layer, and is configured to selectively reflect certain wavelengths of infrared light; and a second optical transparent layer formed on the wavelength-selective reflective layer, wherein the wavelength-selective reflective layer includes at least an amorphous high-refractive-index layer, a metal layer, and a crystalline high-refractive-index layer in contact with the second optical transparent layer.

Abstract: An optical element is provided includes an optical layer having a flat incident surface on which light is incident and a wavelength-selective reflective layer disposed in the optical layer. Of light incident on the incident surface at an incident angle (?, ?), the optical element selectively directionally reflects light in at least one specific wavelength range in at least one direction other than a specular reflection direction (??, ?+180°) while transmitting light in at least one wavelength range other than the specific wavelength range, and is transparent to light in at least one wavelength range other than the specific wavelength range.

Abstract: An optical element is provided includes an optical layer having a flat incident surface on which light is incident and a wavelength-selective reflective layer disposed in the optical layer. Of light incident on the incident surface at an incident angle (?, ?), the optical element selectively directionally reflects light in at least one specific wavelength range in at least one direction other than a specular reflection direction (??, ?+180°) while transmitting light in at least one wavelength range other than the specific wavelength range, and is transparent to light in at least one wavelength range other than the specific wavelength range.

Abstract: An optical member including a first optical layer having convex shapes, and a reflective layer, which is formed on the convex shapes of the first optical layer and is configured to reflect light including at least infrared light, wherein the reflective layer includes at least a metal layer, wherein a maximum height roughness Rz (nm) of inclined planes of the convex shapes is 3.0 times or less an average thickness (nm) of the metal layer, and wherein the average thickness of the metal layer is 40 nm or less.

Abstract: An optical element is provided includes an optical layer having a flat incident surface on which light is incident and a wavelength-selective reflective layer disposed in the optical layer. Of light incident on the incident surface at an incident angle (?, ?), the optical element selectively directionally reflects light in at least one specific wavelength range in at least one direction other than a specular reflection direction (??, ?+180°) while transmitting light in at least one wavelength range other than the specific wavelength range, and is transparent to light in at least one wavelength range other than the specific wavelength range.