| 摘要 |
To provide an image formation optical system which is excellent in image formation performance while reducing an opening angle of an anamorphic lens, and an image reading apparatus using the same. When a thickness of an anamorphic lens is da, a thickness of a meniscus lens arranged adjacent to the anamorphic lens is dm, an interval between the anamorphic lens and the meniscus lens adjacent thereto is tin, and a distance between a lens surface of the lens, of both the lenses, nearest an aperture stop, and a lens surface of the lens, other than both the lenses, facing that lens surface is tout, the constituent elements are set so as to satisfy the following condition:
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