Patent ID: 7965449

Claim:
A projection lens system comprising, in order from a magnification side: a first lens group having a negative refractive power; and a second lens group having a positive refractive power, wherein the projection lens system is substantially telecentric on a reduction side, wherein the first lens group includes a first lens formed as an aspheric lens which is disposed closest to the magnification side, wherein the second lens group includes a second lens formed as a positive lens, in or near which a stop is provided, disposed closest to the magnification side and an aspheric lens, wherein between the stop and the aspheric lens of the second lens group, two or more negative lenses and two or more cemented surfaces are disposed, and wherein the following conditional expressions (1) and (2) are satisfied: 0.10< f/f 2-1 <0.30 (1), and N 2-1 >1.75 (2), where f denotes a focal length of the whole lens system, f 2-1 denotes a focal length of the second lens, and N 2-1 denotes a refractive index of the second lens at the d-line.