Photographing lens having three lens element

Details Photographing lens having three lens element Photographing lens having three lens element

2006-09-19

2006-09-19

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S784000, C359S791000

Reexamination Certificate

active

07110189

ABSTRACT:
A photographing lens includes first, second and third lens elements arranged in a sequence from an object side. The first lens element is a positive meniscus with a positive power, and has a convex surface convex to the object side. One of surfaces of the first lens element is aspherical. The second lens element is a positive meniscus with a positive power. The third lens element is a negative meniscus with a negative power, and has a concave surface oriented to the object side. The first, second and third lens elements satisfy conditions of:in-line-formulae description="In-line Formulae" end="lead"?0.49<|F2/F3|<1.0, andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.5<F23/F<4in-line-formulae description="In-line Formulae" end="tail"?where F is a lens system composite focal length;F2 is a focal length of the second lens element;F3 is a focal length of the third lens element; andF23 is a composite focal length of the second and third lens elements.

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