42 results about "Random surface" patented technology

Combination light diffusion with either sound diffusion or absorption is provided in a single lighting fixture, to provide uniform luminosity and sound control. The traditional flat light diffuser is replaced with a translucent acoustical element which either diffuses sound or absorbs the sound. The sound diffuser topology includes random surfaces, geometrical shapes, number theoretic diffusers or optimized rectilinear or curvilinear surfaces. The translucent sound absorber includes microperforated or microslit panels, as well as translucent fabrics and microperforated, translucent wood veneers.

Disclosed herein is a sheet comprising a polymeric material; light diffusing particles disposed in the polymeric material; and a non-random surface texture on a surface of the sheet; wherein the surface texture comprises hemispherical structures, partial hemispherical structures, ellipsoidal structures, immersed spherical beads, ellipsoidal beads, “bell-shape” bump, complex lens shape structures, pyramidal structures, reversed pyramidal structures, or combinations comprising at least one of the foregoing. The sheet has excellent hiding power and transmission at the same time and is suitable for LED light cover applications. The unit structures have an aspect ratio of 0.15 to 0.5 and a pitch of greater than or equal to 100 μm.

In order to provide an optical sensor that is capable of obtaining both an optical trap effect and a moth eye effect with a single texture structure, a semiconductor optical sensor according to the present invention includes a light absorption medium that has a refractive index n and a thickness sufficiently less than a light transmission length, wherein the center wavelength to be observed is defined as λ. The semiconductor optical sensor is characterized by: having, in a light incident surface, a texture structure having a random surface direction and a typical structure scale d defined as in (λ / n).

The invention discloses a random surface with an accurately designed bandwidth. The random surface is formed by arranging three fundamental submatrixes, wherein the submatrixes are the same in size and are basically the same in number; and different submatrixes are formed by periodically arranging the same fundamental units, so that three kinds of fundamental units are arranged in all. Each fundamental unit comprises a dielectric substrate, a metal patch and a metal backboard, wherein each metal patch and each metal backboard cover the upper surface and the lower surface of the corresponding dielectric substrate respectively. The fundamental units have low loss characteristics; and the phase relationship meets the condition that the phase difference between every two fundamental units does not exceed 180 degrees. The condition that the reflectivity does not exceed 1 / 9 of that of a same size of metal plate can be achieved under the condition. The operation bandwidth of the random surface can be accurately estimated under the premise of not needing large-scale simulation; and the random surface has important engineering application value. The random surface can be applied to large-angle incidence through optimizing arrangement of the submatrixes; obvious scattering is avoided in all back scattering directions; and the random surface has a potential application prospect in the field of stealth.