Patent ID: 6565248
Filing Date: 2003-05-20
Classification: G02B,H04N

Abstract:
A light guide comprising:a transparent member in the shape of a bar, the transparent member configured to transmit a light therein; a scattering mark configured to scatter the light substantially vertical to a longitudinal direction of the transparent member; a reflection surface, having a curved surface, configured to reflect the light scattered at the scattering mark inside the transparent member; and a light exit surface configured to enable the light reflected at the reflection surface to exit outside the transparent member therethrough, wherein: the shape of the reflection surface is determined so that the light scattered at the scattering mark is focused directly onto a predetermined position outside the transparent member; the shape of the curved surface of the reflection surface is determined by an optimizing calculation so that the light scattered at the scattering mark should illuminate the predetermined position outside the transparent member; and majority of contribution to the illumination is attributed to the reflected light.