Imaging lens

Details Imaging lens Imaging lens

2008-01-24

2009-10-06

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S764000

Reexamination Certificate

active

07599131

ABSTRACT:
An imaging lens is provided and includes: in order from an object side of the imaging lens, an aperture diaphragm; a first lens having a positive refractive power and having a convex surface on the object side; a second lens having a negative refractive power and having a concave surface on the object side; and a third lens having a meniscus shape having a convex surface on the object side in the vicinity of an optical axis thereof, each of the first lens, the second lens and the third lens having at least one aspherical surface, and the imaging lens satisfying the following conditional expressions.in-line-formulae description="In-line Formulae" end="lead"?0.9<|f2/f|<11  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.2<|f3/f|<100  (2)in-line-formulae description="In-line Formulae" end="tail"?f represents a focal length of the imaging lens; f2represents a focal length of the second lens; and f3represents a focal length of the third lens.

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