Patent ID: 7766530
Filing Date: 2010-08-03
Classification: F21Y,G02B,G02F

Abstract:
1. A lens for a backlight, comprising: a light transmissive body including outer and inner surface areas, the outer surface area having a convex surface and a concave surface, the inner surface area having a convex surface and a concave surface, wherein the convex surface of the outer surface area is disposed in a central area of the light transmissive body, the concave surface of the outer surface area extends from an end of the convex surface of the outer surface area to an edge of the light transmissive body, the convex surface of the inner surface area is disposed in the central area of the light transmissive body and the concave surface of the inner surface area extends from an end of the convex surface of the inner surface area to the edge of the light transmissive body, wherein the convex surface of the outer surface area has a curvature different from a curvature of the convex surface of the inner surface area and the concave surface of the outer surface area has a curvature different from a curvature of the concave surface of the inner surface area, and wherein the outer and inner surface areas include at least an inflection point, respectively.