A device for a sending and receiving unit of a communication arrangement is provided. The device includes: a first passage for electromagnetic waves and a second passage for electromagnetic waves; a partially transparent surface which is transparent for electromagnetic waves of a first wave length range and which is reflective for electromagnetic waves of a second wave length range, wherein the second wave length range differs from the first wave length range; and a first retroreflective surface which is retroreflective for electromagnetic waves of the first wave length range. A direction of reflection of the electromagnetic waves of the first wave length range differs from a direction of reflection of the electromagnetic waves of the second wave length range if the electromagnetic waves of the first wave length range as well as the electromagnetic waves of the second wave length range are incoming through the same passage.

A device for a sending and receiving unit of a communication arrangement is provided. The device includes: a first passage for electromagnetic waves and a second passage for electromagnetic waves; a partially transparent surface which is transparent for electromagnetic waves of a first wave length range and which is reflective for electromagnetic waves of a second wave length range, wherein the second wave length range differs from the first wave length range; and a first retroreflective surface which is retroreflective for electromagnetic waves of the first wave length range. A direction of reflection of the electromagnetic waves of the first wave length range differs from a direction of reflection of the electromagnetic waves of the second wave length range if the electromagnetic waves of the first wave length range as well as the electromagnetic waves of the second wave length range are incoming through the same passage.

The disclosed structured retroreflective article includes a symbol aligned with raised regions of the structured retroreflective article through an orientation mark which aligns the symbol to the raised region. In one embodiment, the retroreflective article comprises a substrate comprising a background surface and a raised region, a retroreflective film comprising a first symbol and an orientation mark, wherein the retroreflective film is applied to the substrate and the orientation mark aligns the first symbol to the raised region.

The disclosed structured retroreflective article includes a symbol aligned with raised regions of the structured retroreflective article through an orientation mark which aligns the symbol to the raised region. In one embodiment, the retroreflective article comprises a substrate comprising a background surface and a raised region, a retroreflective film comprising a first symbol and an orientation mark, wherein the retroreflective film is applied to the substrate and the orientation mark aligns the first symbol to the raised region.

A multi-stage prism window includes: a first prism configured to condense light whose angle is equal to or larger than a first predetermined angle on a reflective member and retroreflect the light; a second prism configured to condense light whose angle is equal to or larger than a second predetermined angle on an endothermic member or a reflective member and use the light for indoor heating; and a liquid control mechanism configured to fill at least one of a first space and a second space with a liquid, the first space being in contact with the first prism from an indoor side, the second space being in contact with the second prism from the indoor side.

A multi-stage prism window includes: a first prism configured to condense light whose angle is equal to or larger than a first predetermined angle on a reflective member and retroreflect the light; a second prism configured to condense light whose angle is equal to or larger than a second predetermined angle on an endothermic member or a reflective member and use the light for indoor heating; and a liquid control mechanism configured to fill at least one of a first space and a second space with a liquid, the first space being in contact with the first prism from an indoor side, the second space being in contact with the second prism from the indoor side.

Provided a light modulating device including a variable mirror including a plurality of lattice structures, the plurality of lattice structures including a material having a refractive index that changes based on a temperature of the material, a distributed Bragg mirror spaced apart from the variable mirror and provided above the variable mirror, the distributed Bragg mirror including a first material layer and a second material layer that are alternately stacked, and a refractive index of the first material layer being different from a refractive index of the second material layer, and a heating portion configured to heat the plurality of lattice structures and provided below the variable mirror opposite to the distributed Bragg mirror.

A noncontact operation detecting device includes a detecting means configured to be able to detect whether or not an object is present at each of a plurality of points to be observed, which are set in a space, an operation decision section configured to determine, on the basis of a detection result detected by the detecting means, whether or not a gesture operation has been performed, and an aerial image displaying device configured to be able to display an aerial image showing locations of the plurality of points to be observed, in the space.

A noncontact operation detecting device includes a detecting means configured to be able to detect whether or not an object is present at each of a plurality of points to be observed, which are set in a space, an operation decision section configured to determine, on the basis of a detection result detected by the detecting means, whether or not a gesture operation has been performed, and an aerial image displaying device configured to be able to display an aerial image showing locations of the plurality of points to be observed, in the space.

An illumination marker includes a light source and an optical attenuation cover coupled to the light source. The optical attenuation cover is configured to attenuate an intensity of light that passes through the optical attenuation cover based on a length of an optical path of the light through the optical attenuation cover. In some embodiments, the optical attenuation cover may be embodied as a physical barrier cover and include light-blocking structures. Additionally, in some embodiments, the illumination maker may include a diffusive or retro-reflective core rather than the light source.