| 摘要 |
There is provided an image forming optical system in which, it is possible to achieve both, the small-sizing and slimming of an optical system, and a favorable correction of various aberrations, mainly the chromatic aberration. In an image forming optical system including a lens component in which, a shape of another optical surface C of an intermediate layer L2 which is made of a transparent material having Abbe's number &ngr;d2 which is in a close contact with one optical surface B of a lens L1 which is made of a transparent material having Abbe's number &ngr;d1, is an aspheric shape differing from (a shape of) the optical surface B, and furthermore, a lens L3 which is made of a transparent material having Abbe's number &ngr;d3 is in a close contact with the optical surface C, the following conditions are satisfied 0.012<1/&ngr;d3−1/&ngr;d1<0.090  (1) 0.010<1/&ngr;d3−1/&ngr;d2  (2) where, &ngr;d1 denotes Abbe's number for the lens L1, &ngr;d2 denotes Abbe's number for the intermediate layer L2, and &ngr;d3 denotes Abbe's number for the lens L3.
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