LIGHT GUIDE ELEMENT AND LAMP FOR CONTROLLING LIGHT BEAM ANGLE

摘要

A light guide element and a lamp are described. The light guide element has a length and an angle of total reflection. The light guide element includes a light-incident surface, a light-emitting surface, a first reflecting surface, and a second reflecting surface. The light-incident surface includes a first outer peripheral edge and a first inner peripheral edge. The light-emitting surface includes a second outer peripheral edge and a second inner peripheral edge. The first reflecting surface connects the first outer peripheral edge and the second outer peripheral edge. The second reflecting surface connects the first inner peripheral edge and the second inner peripheral edge. An angle is formed between the first reflecting surface and the second reflecting surface. The angle is smaller than the angle of total reflection, and the length is greater than a predetermined distance divided by tan the angle of total reflection).

主权项

1. A light guide element for controlling light beam angle, 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, wherein the light guide element is an annular frustum and has a length and an angle of total reflection, wherein the light guide element comprises:
a light-incident surface having a first outer peripheral edge and a first inner peripheral edge, there is a distance between the first outer peripheral edge and the first inner peripheral edge; a light-emitting surface which is opposite to the light-incident surface, wherein an area of the light-emitting surface is greater than an area of the light-incident surface, wherein the light-emitting surface includes 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; and a second reflecting surface connecting the first inner peripheral edge and the second inner peripheral edge, wherein an angle is formed between an extension line of the first reflecting surface and an extension line of the second reflecting surface; wherein the angle is smaller than the angle of total reflection, and the length of the light guide element is greater than a predetermined distance divided by tan (the angle of total reflection); wherein the predetermined distance is determined by the position where the at least one light beam enters the light guide element from the light-incident surface.