Patent ID: 7837361
Filing Date: 2010-11-23
Classification: B33Y,F21S,F21V,G02B,G03H

Abstract:
1. A light control device implemented with a diffuser exhibiting a controllable luminous intensity distribution pattern in response to incident light, comprising: a substrate having first and second opposite major surfaces that receive incident light before and after, respectively, the incident light propagates within the substrate, the substrate including a generally centrally located region through which a first portion of the incident light is transmitted; and a diffuser supported on the second major surface and outside of the generally centrally located region of the substrate, the diffuser being of a character that diffuses a second portion of the incident light to form diffused light exhibiting a distribution pattern of luminous intensity, the diffuser and the generally centrally located region having optical properties cooperating such that the diffused light and the light transmitted through the generally centrally located region exit the light control device in a batwing luminous intensity distribution pattern; wherein said diffuser includes a microscopic surface relief pattern formed as one of said major surfaces and further includes multiple light scattering elements, said light scattering elements producing diffused light in said batwing luminous intensity distribution pattern.