Imaging lens, optical apparatus and method for forming image...

Details Imaging lens, optical apparatus and method for forming image... Imaging lens, optical apparatus and method for forming image...

2011-05-10

2011-05-10

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S793000

Reexamination Certificate

active

07940478

ABSTRACT:
An imaging lens includes a first lens group having a positive refractive power, an aperture stop, and a second lens group having a positive refractive power, which are disposed in order from an object. The first lens group has a first lens component having a negative refractive power and a second lens component having a positive refractive power, which are disposed in order from the object, and conditions expressed by the expressions 0.12<f/f1<0.47 and 0.016<D12/f<0.079 are satisfied, when f1is a focal length of the first lens group, f is a focal length of the imaging lens, and D12is an air distance between the first lens component and the second lens component of the first lens group.

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