This specification discloses a light source device having a light source and condensing means for converging the light from the light source, the condensing means being provided with a meniscus lens convex toward the light source side in the optical path of the convergent light. The specification also...http://www.google.com/patents/US6231193?utm_source=gb-gplus-sharePatent US6231193 - Light source device, illuminating system and image projecting apparatus
