Zoom lens, imaging apparatus, and personal data assistant

Details Zoom lens, imaging apparatus, and personal data assistant Zoom lens, imaging apparatus, and personal data assistant

2011-01-04

2011-01-04

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000, C359S683000

Reexamination Certificate

active

07864443

ABSTRACT:
A zoom lens includes a first optical system having a positive focal length, the first optical system, a second optical system having a negative focal length, a third optical system having a positive focal length, a fourth optical system having a negative focal length, and a fifth optical system having a positive focal length, which are arranged in order from an object side to an image side and an aperture stop provided at an object side of the third optical system. The following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.5<(T23w/Y′)/(ft/fw)<1.0in-line-formulae description="In-line Formulae" end="tail"?where T23w is an interval between the second optical system and the third optical system at the short focus end, Y′ is a maximum image height of the zoom lens, ft is a focal length of the zoom lens at the long focus end, and fw is a focal length of the zoom lens at the short focus end.

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