Patent ID: 7433134
Filing Date: 2008-10-07
Classification: F21V,G02B

Abstract:
1. A lens for sideward light emission defining a central axis, comprising: a light receiving surface; a parabolic light reflecting surface opposite to said light receiving surface along the central axis, said light reflecting surface being symmetrical with respect to the central axis and defining a focal point on the central axis; and a light exiting surface extending between said light receiving surface and said light reflecting surface, and having a first segment that is proximate to said light reflecting surface, a second segment that is proximate to said light receiving surface, and a third segment that interconnects said first and second segments of said light exiting surface, said third segment forming an angle with the central axis larger than an angle formed between a line radiating from the focal point to a junction of said light reflecting surface and said first segment of said light exiting surface and the central axis; wherein a first portion of light emitted by a light source disposed at the focal point passes through said light receiving surface, and is incident on and is reflected at a plurality of reflection angles by said light reflecting surface to said first segment of said light exiting surface so as to exit said lens in directions perpendicular to said light exiting surface for all said plurality of reflection angles; and wherein a second portion of the light emitted by the light source passes through said light receiving surface, is incident on said second segment of said light exiting surface at a plurality of incident angles, and is refracted by said second segment of said light exiting surface so as to exit said lens in directions perpendicular to said first segment for all said plurality of incident angles.