| 摘要 |
The present invention has as its object to provide an imaging lens which can read image information highly accurately even if there are changes in environmental conditions such as temperature, humidity and atmospheric pressure, and an image reading apparatus using the same. To achieve this object, in an imaging lens for imaging the image information of an original on reading means, at least one of a plurality of lenses constituting the imaging lens is a lens anamorphic with respect to the optical axis thereof, and when the temperature change factor dN/dT (1/° C.) of the refractive index dN of the anamorphic lens for e-line at the use temperature dT is defined as CT, and the focal length (mm) of the anamorphic lens for e-line is defined as fanm, the condition that |CT/fanm|<=4.30x10-6 is satisfied.
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