| 摘要 |
An original reading lens for imaging the image information on the surface of an original on the surface of a sensor, includes an original reading lens having, in succession from the original side, a meniscus-shaped positive first lens having its convex surface facing the original side, a meniscus-shaped negative second lens having its convex surface facing the original side, a stop, a meniscus-shaped negative third lens having its convex surface facing the sensor side, and a meniscus-shaped positive fourth lens having its convex surface facing the sensor side, and the surface of a diffracting optical element disposed near the stop.
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