Imaging lens and imaging apparatus

Details Imaging lens and imaging apparatus Imaging lens and imaging apparatus

2009-08-20

2011-11-08

Choi, William (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S752000

Reexamination Certificate

active

08054562

ABSTRACT:
Disclosed is an imaging lens having a small F number, a wide angle of view, and a low manufacturing cost and capable of obtaining a high-quality image. An imaging lens includes a first lens having a negative power and including a concave surface facing an image side, a second lens having a positive power, an aperture diaphragm, a third lens having a negative power, an aperture diaphragm, a fourth lens having a positive power, a fifth lens having a positive power and including a convex surface facing the image side, and a sixth lens having a negative power arranged in this order from an object side. When the curvature radius of an image-side surface of the third lens is R3rand the curvature radius of an object-side surface of the fourth lens is R4f, the imaging lens satisfies the following Conditional expression:in-line-formulae description="In-line Formulae" end="lead"?|R3r/R4f|<1.0.in-line-formulae description="In-line Formulae" end="tail"?

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