| 摘要 |
A projector zoom lens includes a first lens group having a negative refractive power and a second lens group having a positive refractive power. The first lens group includes a first front group having a negative refractive power and a first rear group having a positive refractive power, including a positive meniscus lens with a convex surface on an enlargement side. The second lens group includes a second front group having a positive refractive power, including two continuously arranged positive lenses made from a same glass material and having a same surface profile and a second rear group having a negative refractive power, including a biconcave lens and a biconvex lens, the lenses of the first and second lens groups being arranged in order from an enlargement side to a reduction side. |
