A sunlight redirector has a first mirror array formed of a first plurality of substantially parallel, uniformly spaced, longitudinal outward mirror segments; and a second mirror array formed of a second plurality of substantially parallel, uniformly spaced, longitudinal inward mirror segments. Each mirror segment has a normal vector. The outward mirror segments are adjustably positionable, such that their normal vectors remain parallel. The first mirror array is rotatable about a normal vector of the sunlight redirector. The inward mirror segments may remain fixed in position at all times; or they may be moved, twice per day, between first and second fixed positions.

Display performance can be improved by reducing light leak in an oblique direction at the time of black display while increasing front brightness. Provided is a backlight unit including: a light collimating member in which a lens array is formed on one surface of a transparent substrate and a plurality of truncated cones are arranged on another surface of the transparent substrate; a light guide plate; and a light source, in which the truncated cone on the light collimating member has a shape in which a width decreases away from the transparent substrate in a height direction, a position of each of lenses of the lens array deviates from a position of the truncated cone corresponding to the lens to move away from the light source in a direction that connects a center of the lens and the light source most adjacent to the lens, an optical axis of the lens is arranged to pass through a slope of the truncated cone corresponding to the lens, the light guide plate and a surface of the truncated cone opposite to the transparent substrate are in contact with each other, and the shape of the truncated cone of the light collimating member satisfies specific expressions.

A multilayer polymeric reflector is provided which comprises: a) a plurality of first optical layers, each first optical layer comprising a polyester having terephthalate comonomer units and ethylene glycol comonomer units, the polyester having a glass transition temperature, where each first optical layer is oriented, and b) a plurality of second optical layers disposed in a repeating sequence with the plurality of first optical layers, each second optical layer comprising a blend of polymethyl methacrylate (PMMA) and polyvinylidene fluoride (PVDF), where the blend has a glass transition temperature less than the glass transition temperature of the polyester comprising the first optical layers, and where the amount of PVDF in the PMMA/PVDF blend is greater than and not equal to about 40% and not more than about 65%. Articles comprising the multilayer polymeric reflector are also provided.

A light-reflecting member includes a plurality of first regions and a plurality of second regions. The first regions are each defined by a first portion and a plurality of first wall portions surrounding the first portion in a plan view with the first wall portions being connected to the first portion. The first regions are arranged in a tessellation in the plan view. The second regions are arranged on an outer side relative to the first regions in the plan view. Each of the second regions includes a second portion located higher than the first portion of each of the first regions. The second portion is connected to at least one second wall portion on a side closer to an adjacent one of the first regions, the at least one second wall portion having a height smaller than a height of the first wall portion as measured from the first portion.

The present invention relates to a light guide mirror assembly, which includes at least two thin prisms in combination with a rotating module. The thin prisms are oriented to direct the light beam towards the designated spot. The bases carrying the thin prisms are fixed by base fasteners or a moveable holder module, and the thin prisms are adjusted in terms of the spacings among them, the inclined angle thereof and the settings thereof to improve the output orientation and beam convergence of the light beam. The invention is useful in illumination, photo-thermal power generation, photovoltaic power generation, heat extraction air conditioner and light beam communication. The invention is also useful in other applications, such as weather control, fire extinguishment, pest control, energy transmission, telecommunication, rock cutting, molten lava casting and light beam probing.

A mirror mounting member is formed of a ceramic structure with a prismatic or angular cylindrical shape and includes, as outer surfaces, a joining surface configured to join to a to-be-joined surface, and an inclined surface inclined relative to the joining surface. The inclined surface is a mounting surface on which is mounted a reflective film that reflects light emitted from a light source. The joining surface includes a plurality of first grooves extending in a longitudinal direction of the structure and a plurality of second grooves intersecting the first grooves. The first grooves are open at both ends, and the second grooves are sealed at an end portion located on a side where light is reflected by the reflective film.

An optical article for directing and distributing light including an optically transmissive layer having one or more arrays of TIR channels and a light diffusing element disposed in optical communication with the optically transmissive layer. The TIR channels define reflective surfaces extending perpendicular or near-perpendicular to a prevailing plane of the optically transmissive layer. The TIR channels and the light diffusing element operate concurrently to redirect and redistribute a beam of light received from a light source such as daylight or an LED over a broad angular range.

A system for providing a solar harvesting building envelope is disclosed. The system includes a plurality of solar harvesting apparatus configured to be installed as or on a building envelope in manner like that of traditional shingles or siding. The apparatus includes a frame having a photovoltaic end wall, as well as reflective base and side walls. A translucent, wedge-shaped body layer is positioned on the frame. A luminescent species film is positioned at and substantially parallel to a base of the wedge-shaped body layer, such that the luminescent species film is positioned at an angle relative to the photovoltaic end wall. Light incident on the wedge-shaped body layer is concentrated towards the photovoltaic end wall, such as through absorption and re-emission along with scattering by the luminescent species film and internal reflection by the wedge-shaped body layer and the reflective base and side walls of the frame. A plurality of apparatus may be wired together to create the building envelope, which has the added advantage of substantially eliminating shading losses of traditional solar harvesting systems.

This reflective member comprises a rectangular bottom surface, four inclined planes joined to the four edges of the bottom surface and whereof each is inclined with respect to the bottom surface so as to slope up from the bottom surface, and four planar corner portion inclined planes, whereof each is disposed in such a manner as to link two adjacent inclined planes.

An example optical device for backlighting includes a receiver disposed in a mobile device to receive ambient light. The optical device also includes a concentrator to concentrate the received ambient light received through the receiver. The optical device further includes a channeler to direct the ambient light beneath a surface of the mobile device to a digital display of the mobile device.