Patent ID: 8251560
Filing Date: 2012-08-28
Classification: F21S,F21W

Abstract:
1. A projector headlight, comprising: a plurality of optical units including a first optical unit, a second optical unit and a third optical unit, each of the optical units including an optical axis, a light source and a projector lens, the projector lens having a light-emitting surface including a total reflection surface and a reflex surface including a light incoming surface, the light-emitting surface including the total reflection surface and the reflex surface, and the total reflection surface and the reflex surface being located opposite with respect to each other and each being curved in a convex shape having curvature factors, the light source including a plurality of light-emitting semiconductor devices and a base board such that the plurality of light-emitting devices are configured in line on the base board, the light source located adjacent to the light incoming surface of the projector lens so that the light-emitting semiconductor devices face the light incoming surface substantially in a horizontal direction with respect to a light-emission direction of the projector headlight, the first optical unit located so that an optical axis of the first optical unit is directed substantially in a direction parallel with the light-emission direction of the projector headlight, the second optical unit located adjacent to the first optical unit so that an optical axis of the second optical unit is slanted at a first angle with respect to the optical axis of the first optical unit in an opposite direction of the first optical unit and substantially in a horizontal direction with respect to the light-emission direction of the projector headlight, the third optical unit located adjacent to the second optical unit so that an optical axis of the third optical unit is slanted at a second angle with respect to the optical axis of the second optical unit in the opposite direction of the second optical unit and substantially in a horizontal direction with respect to the light-emission direction of the projector headlight, and wherein the curvature factors in a horizontal direction with respect to the light-emission direction of the projector headlight of the light-emitting surface including the total reflection surface and the reflex surface of the projector lens in the first optical unit are smaller than the curvature factors in a horizontal direction with respect to the light-emission direction of the projector headlight of the light-emitting surface including the total reflection surface and the reflex surface of the projector lens in the second optical unit, and the curvature factors in a horizontal direction with respect to the light-emission curvature of the projector headlight of the light-emitting surface including the total reflection surface and the reflex surface of the projector lens in the second optical unit are smaller than the curvature factors in a horizontal direction with respect to the light-emission direction of the projector headlight of the light-emitting surface including the total reflection surface and the reflex surface of the projector lens in the third optical unit.