Patent ID: 8240886
Filing Date: 2012-08-14
Classification: F21V,F21W,F21Y

Abstract:
1. An illumination device for illuminating a road, comprising: a lamp holder having an inner surface and a cavity defined by the inner surface; and a light source arranged in the cavity and the inner surface of the lamp holder surrounding the light source, light emitted from the light source being redirected by the lamp holder to establish an illuminating area on the road below the lamp holder, the illuminating area being consisted of a first angular range and a second angular range, along a lengthwise extending direction of the road, the first angular range and the second angular range being located at opposite sides of the lamp holder, the first angular range being directed at an angle Φ1 from a downward vertical line through the lamp holder, the second angular range being directed at an angle Φ2 from the downward vertical line, wherein, Φ2>Φ1, Φ1≦45°; wherein the lamp holder further comprises a light-pervious cover arranged on the lam holder to cover the cavity of the lamp holder, the light-pervious cover comprises a converging lens and a diverging lens adjacent to the converging lens, the light from the light source passing through the converging lens to form the first angular range, and the light from the light source passing through the diverging lens to form the second angular range.