1322 results about "Paraboloid" patented technology

An optical device is for spatially displacing the output of a light-emitting diode (LED) and coupling the output to a predominantly spherical emission pattern produced at a useftul height above the LED. The device is made of a transparent dielectric material, such as an injection-molded plastic. It comprises a lower transfer section that receives the LED's light from below and an upper ejector section that receives the transferred light and spreads it spherically. One or more LEDs. are optically coupled to the bottom of the transfer section, which operates by total internal reflection upon their entire hemispherical emission. One embodiment operates as a flashlight-bulb substitute with the ejector section radiating onto a parabolic reflector, which forms the beam. Thus hemisphencally emitting LEDs can be used in parabolic-mirror flashlights wherein these LEDs by themselves may be unsuitable for that role.

A solar concentrator is provided that comprises two stages. The first stage comprises either a trough-shaped concentrator cusp unit having two major opposed sides joined by two ends. The inner surfaces of the first stage concentrator are mirrored. Further, the ends have two flat, angled surfaces, while the two sides have a Bezier-generated cylindrical shape that approximate parabolic surfaces followed by a straight section. The second stage comprises a bi-axial gradient refractive index (GRIN) element, in which two gradient refractive index materials, each having a high index surface and a low index surface, are joined together along their high index surfaces. The two ends of the bi-axial element are flat, while the two sides also have a Bezier-generated cylindrical shape that approximate parabolic surfaces followed by a straight section. The top surface of the bi-axial element is provided with a cylindrical surface, while the bottom, or exit, surface is ground flat. The high index boundary is parallel to the side surfaces of the first stage unit. A solar cell is bonded to the flat exit surface of the second stage of the concentrator of the present invention. An array of such concentrators and solar cells, in which the solar cells are electrically interconnected, may then be deployed for converting solar energy into useful electrical energy. The 2-D/3-D concentrator evidences much lower mass than prior art concentrators. Further, as the array, or panel, of solar cells wobbles in space, the concentrator will continue to operate, even at lower efficiencies, due to the larger acceptance angle. Concentration ratios on the order of 50x are realized with the present concentrator. However, design studies allow concentration ratios in excess of 300x when used with 3-D versions of the same concept. The second stage can comprise mirrored surfaces. Or, the first stage can comprise a conical section and the second stage a radial GRIN element.

PCT No. PCT/AU95/00303 Sec. 371 Date Mar. 10, 1998 Sec. 102(e) Date Mar. 10, 1998 PCT Filed May 24, 1995 PCT Pub. No. WO96/37732 PCT Pub. Date Nov. 28, 1996An adjustable reflector device is disclosed. The device consists of an adjustable double parabolic reflective skin (1,2) with an adjustable lamp mount (12), incorporating a V-shaped perforated heat shield (17), attached. The two part reflective skin (1,2) forms a double parabolic shape when flexed back against a reinforced spine (3). This flexible shape is secured by lengthwise adjustable chain retainers (4) attached at both ends of the skin (1,2). The lamp mount (12) slides onto a pair of threaded bolts (6,7) secured to the skin and adjustment is achieved by tightening or loosening the appropriate nuts (15,16). The heat shield (17) slides onto the lamp fitting (18) and is positioned appropriately to deflect incident heat and light. This device can be used to provide variable conditions of artificial illumination.

A double reflecting solar concentrator utilizing a primary parabolic reflective surface which reflects incident light toward a secondary surface. The incident light reflects off the secondary surface away from the primary parabolic surface's natural focus point toward a secondary focal point positioned on or substantially near the surface of the primary parabolic reflective surface.

The invention relates to a generating system, in particular to the heat generating system consisting of a solar heat collector and a coal-fired unit. The heat generating system adopts solar energy to take the place of the partial coal-fired heat energy of a coal-fired unit boiler. A condenser, an extraction pump, a low pressure heater, a deaerator, a water-feeding pump, a high pressure heater and the heat collector, a coal burning boiler and a steam turbine that are connected in parallel are connected in series. The steam turbine drives the generator and discharges gas into the condenser. Condensed water flows into a heater from the condenser to be heated up and pressurized, is deoxidized by the deaerator, then goes through the solar heat collector to be heated to be saturated vapor and goes into the coal burning boiler or directly goes into the coal burning boiler to become the steam with high temperature and high pressure. And then the steam goes into the steam turbine for applying work to drive the generator to generate electricity. The extracted steam of the steam turbine goes into each heater to finish thermodynamic cycle. The thermal efficiency of solar thermal power generation is improved, investment in the trough solar electrical energy generation of single paraboloid is reduced and the coal consumption of the coal-fired unit is decreased.

An LED lamp can be used as a light source of a lighting device. The LED lamp can be combined with a reflecting mirror formed as a paraboloid of revolution, to obtain desired light distribution characteristics, as with a conventional light source. The emission surface of the LED lamp for the light source of the lighting device can be rectangular, and the ratio between a short side and a long side thereof is set in a range of 1:2 to 1:6. Therefore, it is possible to form a light distribution pattern similar to that of a filament, which is conventionally used as an emission source. It is also possible to use almost all light emitted from the LED lamp as illumination light.

A parabolic primary mirror (10) has a concave specular surface (12) that is constructed and positioned to receive solar energy and focus it towards a focal point. A secondary mirror (14) having a convex specular surface (16) is constructed and positioned to receive focused solar energy from the primary mirror and focus it onto an annular receiver (18). The annular receiver (18) may include an annular array of optical elements (100) constructed to receive solar energy from the secondary specular surface (14) and focus it onto a ring of discreet areas. A ring of solar-to-electrical conversion units are positioned on the ring of discreet areas. A sun sensor that allows accurate solar tracking to keep mirror system aligned with the sun.

A Catadioptric Light Distribution System is disclosed. The system collects and collimates the hemispherical pattern of light emitted by a Lambertian light emitting diode (LED) into a collimated beam directed essentially parallel to the optical axis of the LED. The system comprises a circular condensing lens having a center axis that is aligned with the optical axis of the LED and which is configured to receive an collimate a portion of the light from the LED defined by a central cone of light centered around the optical axis. A parabolic reflector having circular opening formed therethrough is centered on the center axis of the parabolic reflector and is positioned around the LED to receive and redirect the light which does not form the cone that impinges upon the condensing lens in a collimated annular beam in a direction away from the condensing lens. The light reflected and culminated by the parabolic reflector is directed onto a circular annular double bounce mirror which is configured and positioned to receive the annular beam from the parabolic reflector and reflect that beam of light 180° so that it is collimated in an annular beam which passes around the edge of the condensing lens. Thus, substantially all the light emitted by the LED is culminated into a beam of light that is substantially parallel to the optical axis of the LED by either the condensing lens or by the combination of the parabolic reflector and the double bounce mirror.

A composite reflecting surface for a linear LED array incorporates a truncated circular parabolic reflector surrounding each LED and a trough axially above the circular parabolic reflectors defined between parallel longitudinal reflecting surfaces. The short circular parabolic reflectors collimate wide angle light from the LED into a direction parallel to the LED optical axis. The longitudinal reflecting surfaces are linear parabolic surfaces altered to improve the vertical spread of the light radiation pattern. Longitudinal convex ribs project inwardly from the basic linear parabolic shape. The convex shape of the ribs “sprays” the light incident upon it in a vertically spread pattern. The composite reflecting surface makes use of light from a linear array of LEDs that would otherwise be wasted.

A fluorescence-like light emitting diode (LED) illumination unit is provided, which includes a radiator, an LED substrate fixed on the radiator, and multiple LED illuminants encapsulated on the LED substrate. A first surface of the radiator is in the shape of a paraboloid with reflective effect. A bar-shaped convex lens with radial converging effect is disposed in the space surrounded by the paraboloid. The bar-shaped convex lens is located in front of the multiple LED illuminants and radially converges part of light rays emitted by the multiple LED illuminants but axially diffuses them. The illumination unit completely solves the problems such as exposure of spotted light sources, small irradiation angle of a light path, beaded light spots of the LED light sources as the lamp illuminant, visual dizziness caused by multiple projections formed by irradiating an irradiated object with a multi-point light source, dazzling light rays, and the like in an existing LED illumination lamp. The illumination unit emits more uniform and soft light rays, with a higher brightness in an irradiated region and a light emitting mode which is basically not different from that of a conventional daylight lamp, and meets the long-term using habit and approval of people. Various applications of the fluorescence-like LED illumination unit are further provided.

According to various embodiments, a parabolic antenna may include a radome with an optically transparent window. The parabolic antenna may include a feedhorn socket configured to receive a feedhorn assembly. The feedhorn socket may also be configured to receive a spotting scope. According to various embodiments, the spotting scope may be mounted in place of the feedhorn assembly and used to optically align the parabolic antenna with respect to a distant target. The optically transparent window positioned in the radome may allow a user to see through the radome. Once aligned, the spotting scope may be removed from the feedhorn socket. A feedhorn assembly may then be secured in the feedhorn socket and a radio unit coupled thereto for radio frequency transmission.

The invention is a generator for photovoltaic conversion of concentrated sunlight into electricity. A generator according to the invention incorporates a plurality of photovoltaic cells and is intended for operation near the focus of a large paraboloidal reflector pointed at the sun. Within the generator, the entering concentrated light is relayed by secondary optics to the cells arranged in a compact, concave array. The light is delivered to the cells at high concentration, consistent with high photovoltaic conversion efficiency and low cell cost per unit power output. Light enters the generator, preferably first through a sealing window, and passes through a field lens, preferably in the form of a full sphere or ball lens centered on the paraboloid focus. This lens forms a concentric, concave and wide-angle image of the primary reflector, where the intensity of the concentrated light is stabilized against changes in the position of concentrated light entering the generator. Receiving the stabilized light are flat photovoltaic cells made in different shapes and sizes and configured in a concave array corresponding to the concave image of a given primary reflector. Photovoltaic cells in a generator are also sized and interconnected so as to provide a single electrical output that remains high and stable, despite aberrations in the light delivered to the generator caused by, for example, mispointing or bending of the primary reflector. In some embodiments, the cells are set back from the image formed by the ball lens, and part of the light is reflected onto each cell small secondary reflectors in the form of mirrors set around its perimeter.

A light emitting diode, a reflector and a platform are employed within a light source. The light emitting diode emits light exclusively from its side surfaces. The reflector has a parabolic reflective surface that collimates any portion of the light reflecting from the parabolic reflective surface. The platform supports a centering of the light emitting layer(s) of the light emitting diode on a focus point of the parabolic reflective surface.

The invention relates to a steerable antenna platform including two independently controllable motors for rotating a flat plate or a parabolic dish antenna about two perpendicular axes. The antenna platform includes a semicircular yoke rotatable about a fixed axes with bearings mounted on either end thereof for pivotally supporting the antenna. The antenna platform also includes a ball joint for supporting the center of the antenna, enabling a reduction in the requirements of the two motors.

A vehicle headlamp is provided with: a main reflector having a convergent reflecting surface; a semiconductor-type light source; a projecting lens; an auxiliary reflector having a parabolic reflecting surface; a shade and a light shading member that are structured integrally with each other; and a switching device. By means of the switching device, the shade and light shading member, which are structured integrally with each other, are switched and positioned in a first location and a second location, thereby allowing light distribution patterns for high and low beams to be switched and illuminated toward a forward direction of a vehicle. As a result, the vehicle headlamp becomes capable of achieving downsizing, weight reduction, power saving, and cost reduction.

Provided is a solar heat collector based on a groove type parabolic mirror and an artificial blackbody. Three vacuum heat collecting tubes are arranged in a cavity to reduce reflection loss caused by perpendicular incidence of sunlight and improve the sunlight absorption rate. By utilizing condensation of double-reflecting mirror with groove type paraboloid and ellipsoid, the reflected light can be well focused on the heat collecting tubes, and the coupling degree of the groove type solar heat collector to the sunlight is simultaneously improved. The vacuum heat collecting tubes are installed on the lower portion of a condensation device so that a condensation plate can conveniently trace the sun. In addition, the solar heat collector further has the remarkable advantages that installation is convenient, impact influences of the outside world on a glass tube are small, and liquid leakage caused by rotation of the heat collecting tubes is overcome simultaneously.