Patent ID: 8693109

Claim:
A projector lens system that projects projection light from a light modulator onto a screen, the projector lens system comprising, in order from a screen side thereof: a first negative lens that is made of resin and is convex on the screen side, both surfaces of the negative meniscus lens being aspherical; a first positive lens that is made of glass and is biconvex; a stop; a cemented lens that has negative refractive power and is composed, in order from the screen side, of a second negative lens that is made of glass and is biconcave and a second positive lens that is made of glass and is biconvex; and a third positive lens that is made of resin and is biconvex, both surfaces of the third positive lens being aspherical, wherein a refractive index n 1 of the first negative lens, a refractive index n 2 of the first positive lens, a refractive index n 32 of the second positive lens, and a refractive index n 4 of the third positive lens satisfy the following conditions 1.45≦n1≦1.60, 1.45≦n4≦1.60, 0.16 ≦n 2− n 1≦0.31, 0.16 ≦n 32 −n 4≦0.31, 0.95 ≦n 1/ n 4≦1.05, and 0.95 ≦n 2 /n 32≦1.05.