Imaging lens and imaging apparatus

Details Imaging lens and imaging apparatus Imaging lens and imaging apparatus

2011-03-22

2011-03-22

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S771000

Reexamination Certificate

active

07911715

ABSTRACT:
An imaging lens includes in order from an object side: a first lens including a positive lens having a convex surface directed to the object side; a stop; a second lens including a positive lens having a convex surface directed to an image side; a third lens including a negative meniscus lens with a concave surface directed to the object side; and a fourth lens including, near an optical axis, a positive meniscus shape with a convex surface directed to the object side. An air space between the second lens and the third lens is smaller in a periphery than near the optical axis. And f1>f2>|f3| and 1.0<f/f2<1.5 are satisfied where f1, f2and f3are focal lengths of the first lens, the second lens, and the third lens, respectively and f is an focal length of the whole lens system.

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