Patent ID: 8611012
Filing Date: 2013-12-17
Classification: E04C,F21S,G02B

Abstract:
1. A light guide plate comprising: a substrate configured for being mounted on an outside surface of a window of a building, the substrate comprising a first surface and an opposing second surface, the first surface facing away from the outside surface, the second surface facing the outside surface, the substrate made of transparent material; and a plurality of horizontally oriented elongated prisms arranged on the first surface and parallel to each other, each prism comprising a flat side surface facing upward and a curved side surface facing downward, the flat side surface and the curved side surface extending from the first surface and intersecting at a line away from the first surface, each flat side surface facing toward a main plane defined by a ceiling of the building, the corresponding curved side surface facing away from the main plane defined by the ceiling, each curved side surface configured for reflecting light passing through the flat side surface to the ceiling of the building.