Topic
Parabolic reflector
About: Parabolic reflector is a research topic. Over the lifetime, 3375 publications have been published within this topic receiving 30735 citations. The topic is also known as: paraboloid reflector & paraboloidal reflector.
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Patent•
02 May 1995
TL;DR: A lamp matrix display as mentioned in this paper includes a vertical planar array of light sources arranged in rows and columns and a plurality of reflectors positioned about corresponding light sources and having reflector surfaces for directing the light emitted from the light source in a forward direction.
Abstract: A lamp matrix display includes a vertical planar array of light sources arranged in rows and columns and a plurality of reflectors positioned about corresponding light sources and having reflector surfaces for directing the light emitted from the light source in a forward direction. The reflective surface of at least one of the reflectors includes multiple parabolic reflective surfaces having offset focal points. At least one lens is mounted in front of the reflectors. The lens may be a single lens having an inner flat surface disposed adjacent an outer edge of each reflector surface and an outer prismatic surface having vertical prisms to horizontally spread the light from the planar array of light sources. Further, the plurality of reflectors may be structurally supported about corresponding light sources by a matrix framework and the matrix framework may include a plurality of air vents.
31 citations
Patent•
04 Dec 1975
TL;DR: In this article, a parabolic reflective surface or parabolic mirror was used for receiving solar radiation and focusing the radiation to a pipe disposed at a focal point of the mirror collector.
Abstract: Solar collector energy apparatus is disclosed which includes a parabolic reflective surface or parabolic mirror for receiving solar radiation and for focusing the radiation to a pipe disposed at a focal point of the mirror collector, and the pipe is also disposed in direct contact with the parabolic mirror collector so as to receive reflection from the mirror, and a heat chamber is included behind the parabolic mirror collector to trap heat behind the collector and thus provide an additional heat source for the pipe, and for fluid in the pipe.
31 citations
Patent•
3M1
TL;DR: A Fresnel-type reflector having the physical shape of a cone was made by forming a reflective coating on a structured surface of a thin flexible film and forming the film into the shape of cone as discussed by the authors.
Abstract: A Fresnel-type reflector having the physical shape of a cone. In a preferred embodiment, the reflector is made by forming a reflective coating on a structured surface of a thin flexible film and forming the film into the shape of a cone. The structures on the surface are designed to cause the reflector to imitate the optical properties of a parabolic reflector when the reflector of the invention is formed into the shape of a cone.
31 citations
TL;DR: In this paper, a new integrated shaped lens antenna configuration with frequency stable radiation pattern and phase center position across a broad 1:3 frequency band is described, which can be used for focal plane reflector feeding in quasi-optical radio telescope systems.
Abstract: A new integrated shaped lens antenna configuration is described with frequency stable radiation pattern and phase center position across a broad 1:3 frequency band, which can be used for focal plane reflector feeding in quasi-optical radio telescope systems. The lens is compatible with the integration of ultrawideband uniplanar printed feeds at its base and equally broadband mixing devices, like the Hot Electron Bolometer (HEB), although these are not used in the present work. Measurements on a scaled mm-wave lab prototype have confirmed stable performance versus frequency, with only dB directivity variation, and better than 94% Gaussicity, thanks to the possibility to impose a predefined output radiation pattern template. Simulations were performed to test the illumination of an off-set parabolic reflector by the lens radiation pattern, which confirmed reasonably constant aperture efficiency in the order of 78% across the 100% bandwidth.
31 citations