Imaging lens

Details Imaging lens Imaging lens

2008-03-28

2010-06-22

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S708000

Reexamination Certificate

active

07742238

ABSTRACT:
An imaging lens includes, in order from an object side, a first lens having a positive refractive power and having a meniscus shape with a convex surface directed to the object side thereof, a second lens having a concave object-side surface and a third lens having a negative refractive power in a vicinity of an optical axis. Each of the second and third lenses has at least one aspheric surface. The following conditional expressions are satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.8<f1/f<1.2  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?11<|f2/f|  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.04<SA/Y<0.09  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?TL/2Y<0.9  (4)in-line-formulae description="In-line Formulae" end="tail"?whereSA denotes the amount of sag of the object-side surface of the second lens in a position where a principal ray passes the maximum image height,Y denotes the maximum image height, andTL denotes a distance from an object-side surface of the first lens to an image formation position.

REFERENCES:
patent: 6961191 (2005-11-01), Sato et al.
patent: 7099092 (2006-08-01), Sato et al.
patent: 7180687 (2007-02-01), Sato et al.
patent: 7184225 (2007-02-01), Noda
patent: 2004/0190162 (2004-09-01), Sato
patent: 2004-302058 (2004-10-01), None
patent: 2005-173319 (2005-06-01), None
patent: 2005-227755 (2005-08-01), None
patent: 2005-292235 (2005-10-01), None

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