Image reading lens and image reading apparatus

Details Image reading lens and image reading apparatus Image reading lens and image reading apparatus

2008-06-27

2009-10-06

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S754000, C359S782000

Reexamination Certificate

active

07599130

ABSTRACT:
An image reading lens is provided and includes: in order from an object side of the image reading lens, a first lens of a negative lens having a meniscus shape directing a concave surface toward the object side thereof; a second lens having a biconvex shape; a stop; a third lens of a positive lens having a meniscus shape directing a convex surface toward an image side thereof; and a fourth lens of a negative lens having a meniscus shape directing a concave surface toward the object side thereof. The image reading lens satisfies the following conditional expressions:in-line-formulae description="In-line Formulae" end="lead"?2.4<f3/f<3.5in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.007<D2/f<0.028in-line-formulae description="In-line Formulae" end="tail"?where f represents a focal length of the image reading lens, f3represent a focal length of the third lens, and D2represents a spacing between an image-side surface of the first lens and an object-side surface of the second lens.

REFERENCES:
patent: 5936783 (1999-08-01), Nakai et al.
patent: 6747818 (2004-06-01), Ohashi et al.
patent: 2007/0097522 (2007-05-01), Yamamoto
patent: 11-190820 (1999-07-01), None
patent: 2002-296499 (2002-10-01), None
patent: 2007-121743 (2007-05-01), None

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