Patent ID: 6845805
Filing Date: 2005-01-25
Classification: E06B,F21S

Abstract:
1. Light guiding blinds having at least partly prism molded toothed upper sides, said prism-molding being provided at least in a first portion of the blinds disposed close to an irradiation area and serving for deflecting daylight, said prism-molded teeth of one prism side showing towards sun incidence and with one reverse prism side showing towards the interior space, and two blind edges each on the sun incidence side forming an incidence portion and two blind edges each on the interior space side forming a deflection portion, and a blend edge of a lower blind each in the incidence portion and a blind edge of an upper blind each in the deflection portion forming an angle relative to inner blind edges, and sun irradiation impinging from outside being back-reflected at an angle relative to the outer blind edges in the direction of the outer space, the front side being the sum incidence side, said blind edges being in parallel relative to each other, characterized in that a) the individual prism-molded tooth sides shoaling towards sun incidence have angles of inclination relative to the horizontal, an angle of inclination being essentially smaller in the area of the incidence portion and an angle of inclination being larger at larger distance from the incidence portion, and b) the angles of inclination of at least one of the individual teeth and the tooth sides of a first and a second tooth showing towards sun incidence increases following a concave curve path increasingly ascending starting from the irradiation area towards the interior space, and c) at an upper side of light guiding blinds back-reflected radiation is concentrated and a concentration zone is formed near the incidence portion, said concentration zone is disposed in front of at least one of blinds in the incidence portion and on the underside of an upper blind behind the incidence portion, and d) on the upper side of the light guiding blind back-reflected light radiation is back-reflected at the individual teeth at an angle wherein a back reflection angle into the outer space is smaller than the angle between two blind edges of a lower blind in the incidence portion and an upper blind in the deflection portion.