A beam focusing lens having an optical axis for focusing at a point of focus a light beam having different angles of divergence in orthogonal directions perpendicular to the optical axis consists of one or two lens components, each of which may be a single lens element and made of plastic and each of...http://www.google.se/patents/US7580601?utm_source=gb-gplus-sharePatent US7580601 - Anamorphic aspherical beam focusing lens
