Wide-angle imaging lens

Details Wide-angle imaging lens Wide-angle imaging lens

2007-05-25

2009-12-22

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S740000

Reexamination Certificate

active

07636205

ABSTRACT:
A wide-angle imaging lens comprises, in order from an object:a first lens having a negative refractive power;a second lens having a positive refractive power with a convex face directed to the object;an aperture diaphragm;a third lens having a positive refractive power with a convex face directed to an image; anda fourth lens having a positive refractive power with a convex face directed to the object,wherein the following conditional expressions are satisfied.in-line-formulae description="In-line Formulae" end="lead"?N2≧1.7  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?N3≧1.7  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?N4≧1.7  (3)in-line-formulae description="In-line Formulae" end="tail"?whenN2: a refractive index of the second lens at the d-lineN3: a refractive index of the third lens at the d-lineN4: a refractive index of the fourth lens at the d-line.

REFERENCES:
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