Image reading lens and image reading apparatus using image reading lens
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United States of America Patent
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Sep 30, 2014
Grant Date -
Nov 17, 2011
app pub date -
May 16, 2011
filing date -
May 17, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is an image reading lens to be used for reading image information of an original. The image reading lens includes an anamorphic lens having at least one anamorphic surface with an aspherical shape which is rotationally asymmetric about an optical axis. The anamorphic lens has a non-arc shape in each of a main scanning section and a sub scanning section. The at least one anamorphic surface has a positive optical power in a main scanning direction on the optical axis, and a non-arc amount of the sub scanning section continuously changes with an increase in distance from the optical axis in the main scanning direction.
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