Patent ID: 6947222

Claim:
A projection lens for enlarging an image on a display surface and projecting the enlarged image onto a screen, the projection lens comprising: a first group of lenses having a negative power; and a second group of lenses having a positive power, wherein the first and the second groups are sequentially arranged from an enlargement side to a reduction side, and wherein the projection lens has a field angle of about 110° or more and the projection lens satisfies the following conditional expressions (1) to (4): 25.0<Fb, (1) F<0.65 H, (2) 30 F<|EP|, (3) and 4F<T, (4) where Fb is an air-converted distance from a final surface at the reduction side of the lens to an image point, H is a maximum image height at the reduction side, F is a focal distance of the whole projection lens, EP is a exit pupil distance, and T is an air-converted distance obtained by air-converting a gap between the first group of lenses and the second group of lenses.