Patent ID: 9033552
Filing Date: 2015-05-19
Classification: F21V,G02B

Abstract:
1. A light guide element for controlling a light shape, suitable for guiding at least one light beam, wherein the at least one light beam is totally reflected in the light guide element to generate a predetermined light beam angle, and the light guide element is an annular frustum and comprises: a light-incident surface having a first outer peripheral edge and a first inner peripheral edge; a light-emitting surface which is opposite to the light-incident surface and has a second outer peripheral edge and a second inner peripheral edge; a first reflecting surface connecting the first outer peripheral edge and the second outer peripheral edge, wherein the first reflecting surface is a curved surface constructed by a first profile curve, wherein the first profile curve is a connecting line from a first initial point on the first outer peripheral edge to a first terminating point on the second outer peripheral edge; and a second reflecting surface connecting the first inner peripheral edge and the second inner peripheral edge, wherein the second reflecting surface is a curved surface constructed by a second profile curve, wherein the second profile curve is a connecting line from a second initial point on the first inner peripheral edge to a second terminating point on the second inner peripheral edge.