| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical means used for efficiently condensing light diffusing to surroundings from an LED chip by a reflector and a condensing lens, and condensing it on a desired spot, at desired illuminance, suitable for the size of an object located in a distant location. <P>SOLUTION: The LED chip is arranged by being brought close to a vertex of a lens having one end having directivity in a light-emitting direction and formed in to a nearly conical shape; the distance of an irradiation object and the size of an illumination spot are allowed to be optionally set by changing the vertex of the circular cone; light that is about to diffuse more than a lens diameter is contained by a cylinder arranged adjacent to a light emission side of the lens and having a cavity in its inside, and guided to an object located in a long distance; a reflector is arranged to surround the lens; light that cannot be condensed by the lens is captured, and reflected and refracted in a predetermined direction; and thereby light emission efficiency is improved. <P>COPYRIGHT: (C)2010,JPO&INPIT |
