| 摘要 |
An image forming lens includes: a first optical system positioned in an object side, a second optical system positioned in an image side, and an aperture stop interposed between the first optical system and the second optical system, wherein the first lens system includes a first F lens group which is positioned in the object side and has at least two negative lenses, and a first R lens group which is positioned in the aperture stop side and has at least one lens, wherein a distance between the first F lens group and the first R lens group is set to be largest, and wherein the second optical system includes a second F lens group in which, in the order from the aperture stop side, a first positive lens, a first negative lens, a second negative lens, and a second positive lens are arranged, and a second R lens group positioned in the aperture stop side and having at least one positive lens.
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