| 摘要 |
PROBLEM TO BE SOLVED: To effectively compensate for aberrations by using an aspherical lens made of plastic, in a projection lens device used for a projector device. SOLUTION: A first 1A lens group and a first 1B lens group are arranged on the front side of a diaphragm A and a 2nd lens group is arranged on the rear side of the diaphragm A. Aspherical lenses L2 and L11 are arranged to be second from the front side of the first 1A lens group and at the rear end of the 2nd lens group. The lenses L2 and L11 are made of plastic, and only their surfaces far from the diaphragm A are made the aspherical surfaces r3 and r22.
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