PROJECTION LENS SYSTEM AND IMAGE PROJECTION DEVICE

WIPO Patent Application WO/2020/066593

A1

A projection lens system having a plurality of lens groups that contain one or more lenses and that move such that the interval between the lens groups changes during a zoom operation. The projection lens system has a first lens group having a positive power at the farthest end on the enlargement side, has one negative lens in the first lens group, and satisfies the inequalities 0.005<Δpgfn<0.01 and 32