A projection lens unit for a projector employed to a projector having a light source and a display device disposed slantingly with respect to an optical axis of light irradiated from the light source, for enlarging and projecting the light incident slantingly with respect to the optical axis via the...http://www.google.com.au/patents/US6188523?utm_source=gb-gplus-sharePatent US6188523 - Projection lens unit for projector
