Patent ID: 8218252
Filing Date: 2012-07-10
Classification: G02B

Abstract:
1. A projection lens, disposed between an enlarged side and a reduced side, the projection lens comprising: a first lens group, having a negative refractive power, and comprising a first lens and a second lens sequentially arranged from the enlarged side to the reduced side, wherein the first lens and the second lens respectively have a positive refractive power and a negative refractive power; a second lens group, having a positive refractive power, disposed between the first lens group and the reduced side, and comprising a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from the enlarged side to the reduced side, wherein the fifth lens and the sixth lens respectively have a positive refractive power; a third lens group, having a positive refractive power, disposed between the second lens group and the reduced side, and comprising a seventh lens; and an optical element, disposed between the second lens group and the third lens group.