摘要:
A lighting device includes a thin transparent plate in which a plurality of micro-lenses arranged in a matrix are integrated. A second thin transparent plate is supported so as to be movable relative to the first plate by means of at least one pair of flexures. A plurality of micro-lenses arranged in a matrix are also integrated in the second plate.
摘要:
A lighting device which can be used for illuminating pedestrian crossings or in other applications where it is necessary to form a defined and uniform rectangular pattern includes a parabolic reflector element and a planar screen with an array of cylindrical microlenses or microprisms on a surface thereof.
摘要:
A reflector (R) for a lighting device having a light source elongated in one direction has a three-dimensional curved shape which provides a maximum efficiency of the device with the required control on the direction of the light beam at the output.
摘要:
High-density polyethylene (HDPE) is used as a coating for optical elements operating in transmission in the infrared spectrum, which are made up of a material other than polyethylene, such as hygroscopic salt, semiconductor materials, fluorides, chalcogenides, silver halides, and others, so as to exploit the optical properties of HDPE, at the same time keeping the thickness reduced.
摘要:
Bidimensional or three-dimensional, single-layer or multilayer nanostructure, whose electric conductivity B in the total structure has a highly non-linear behavior due to local tunnel effect between adjacent clusters, and it can be varied at will by varying the voltage applied to the electrodes.
摘要:
A luminous signalling device comprises a body made of transparent synthetic material, basically in the form of a plate having two larger faces set opposite one another, at least one of which carries an image. A plurality of LED devices of the SMD type which emit white light is coupled externally to at least one of the walls that define the peripheral edge of the aforesaid plate body. The arrangement is such that the rays of white light coming out of the LED devices undergo multiple total reflections within the plate body, which thus functions as a light guide. In areas corresponding to selected areas of the image, the face of the plate body is made up of diffusing optical elements designed to diffuse outwards the rays of light that are incident on said areas within the body.
摘要:
A lighting device has a light source, comprising a volume (11) inside which combustion of a fuel-comburent mixture is confined. A photonic crystal structure (16) is positioned inside the volume (11). The photonic crystal structure (16) operates to inhibit or limit emission from said passage of at least a part of infrared radiation and simultaneously allow emission of visible light radiation. (FIG. 1)
摘要:
An electroluminescent device (1) comprises a supporting substrate (2); at least two electrodes (3) positioned on the substrate (2); at least a three-dimensional percolated layer (4), positioned on the substrate (2) between the two electrodes (3), having a metallic mesoporous structure defining a multitute of cavities of micrometric or nanometric dimensions. Present in the cavities of the three-dimensional percolated layer (4) are a multitude of luminescent inclusions (5), which operate to emit light when energized by electrons which, as a result of electron tunneling, effect pass through the three-dimensional percolated layer (4).
摘要:
A light emitting device comprises a substrate, a porous alumina layer having a regular series of cavities of nanometric size containing an emitting material, and two electrodes in contact with the emitting material and connected to an electric voltage source. The first electrode comprises at least part of an aluminum film deposited onto the substrate, on which the alumina layer has been previously grown through an anodization process.
摘要:
A method for making three-dimensional structures of nanometric or micrometric dimensions comprises the following steps: obtaining of a photopolymeric or UV mixture including nanoparticles orientable in space; deposition of a layer of the mixture on a respective substrate; exposure of the layer to UV-radiation and control of the polymerization of the mixture by means of variation of its index of refraction; application of a magnetic and/or electrical field for producing a desired positioning of the nanoparticles, in order to induce the growth of surface projections from the layer of mixture; and polymerization of the mixture.