An optical film includes a substrate, an absorption pattern and a scattering reflection layer. The substrate has a contact surface and a back surface opposite the contact surface, wherein the substrate allows a first light to pass and is made of a non-rigid material. The absorption pattern is arranged on the contact surface of the substrate to absorb the first light. The scattering reflection layer is arranged on the back surface of the substrate to scatter and reflect the first light to the contact surface of the substrate. The foregoing optical film enables an optical reader device to detect variations of the reflected first light, which is caused by deformation of the substrate, so that the corresponding force information can be obtained. A user input system including the foregoing optical film is also disclosed.

A diffusive ultraviolet illuminator is provided. The illuminator can include a reflective mirror and a set of ultraviolet radiation sources located within a proximity of the focus point of the reflective mirror. The ultraviolet radiation from the set of ultraviolet radiation sources is directed towards a reflective surface located adjacent to the illuminator. The reflective surface can diffusively reflect at least 30% the ultraviolet radiation and the diffusive ultraviolet radiation can be within at least 40% of Lambertian distribution. A set of optical elements can be located between the illuminator and the reflective surface in order to direct the ultraviolet radiation towards at least 50% of the reflective surface.

The invention relates to a weatherproofing arrangement having a textile sheet material which forms a screen against the effects of weather, in particular against solar radiation and/or rain, and has warp threads and weft threads connected to one another in the manner of latticework. In order to achieve particular protective functions, it is proposed for the warp threads and weft threads to bound elongate-rectangular latticework openings, wherein the length of these openings is at least 10 times the width thereof, and wherein the width of the openings is from between 0.1 and 0.001 mm.

The disclosure relates to wavelength-controlled directivity of all-dielectric optical nano-antennas. One example embodiment is an optical nanoantenna for directionally scattering light in a visible or a near-infrared spectral range. The optical nanoantenna includes a substrate. The optical nanoantenna also includes an antenna structure disposed on the substrate. The antenna structure includes a dielectric material having a refractive index that is higher than a refractive index of the substrate and a refractive index of a surrounding medium. The antenna structure includes a structure having two distinct end portions. The antenna structure is asymmetric with respect to at least one mirror reflection in a plane that is orthogonal to a plane of the substrate.

Light reflecting and directing umbrella apparatus and systems and methods utilizing such apparatus capable of shifting its shape for the purpose of manipulating and directing light from a light source in both a symmetrical and asymmetrical manner to illuminate a particular subject in a various manners for stage, studio, motion picture and still photography.

A projection screen including a substrate, Fresnel structures and a protective layer is provided. The Fresnel structures are located on a surface of the substrate facing an image-source side and arranged along a first direction. Each Fresnel structure extends along a second direction. The protective layer has a first surface facing the image-source side. The first surface has optical microstructures. The optical microstructures are orthographically projected on a reference plane to form orthographic projection patterns. Each of the orthographic projection patterns has a first axis and a second axis substantially perpendicular to each other. The first axis passes through two end points having a maximum distance in the first direction. The second axis passes through two end points having a maximum distance in the second direction. Each of the orthographic projection patterns is symmetry to at least one of the first axis and the second axis.

A head-up display includes a laser projector, a diffuser, an image combiner, and a light shield. The laser projector emits an image beam. The diffuser has a reflection surface for receiving and diffusely reflecting the image beam emitted from the laser projector. The image combiner receives the image beam reflected from the diffuser to form a virtual image whereby a user sees the virtual image and a real-world environment at the same side of the virtual image through the image combiner. The light shield includes a grating structure disposed on the reflection surface of the diffuser.

An illumination apparatus includes: a light-guiding portion including a light-introducing opening through which light is introduced from a light-emitting portion of an image pickup apparatus, a reflective surface that reflects light introduced from the light-introducing opening toward an image pickup optical axis of the image pickup apparatus, and a diffusion portion that diffuses the light reflected by the reflective surface toward an object as diffused light; and a reflective body including an opening portion allowing an image pickup opening of the image pickup apparatus to be exposed, and a reflective portion provided around the opening portion and including a reflective surface formed to expand from the opening portion toward the object, wherein the diffusion portion is disposed at a part of the reflective portion and the reflective body includes a wall portion extending to the object side at a boundary between the opening portion and the diffusion portion.

The scintillator panel includes a support, a reflective layer on the support, and a scintillator layer formed on the reflective layer by deposition. The reflective layer includes light-scattering particles and a binder resin. The light scattering particles are buried in the binder resin such that there is an area free of light scattering particles in the reflective layer.

An optical coating structure applied to the surface of an object having scattering structures introduced to the basal, upper or middle layers of a multilayer reflector to cause a particular (calculated) degree of scattering, or to the surface of a black/colour pigmented object. The scattering structures are mainly sub-micron in size, and arranged in a pseudo-random or non-periodic manner. Consequently they serve only to broaden the angular range of the light reflected at the surface normal from a multilayer reflector, or to provide (actual and/or perceived) reduced reflectivity of a surface by deflecting incident light through the surface rather than away from it or by scattering otherwise beam-like (narrow-angle) reflections from a surface into a broad-angle reflection. The scattering structures can include profile elements, which are in the form of elongate bars having convexly curved sides or hemispherical rods, that are introduced to a basal layer of a multilayer reflector.