Zoom lens system and lens barrel having the same

Details Zoom lens system and lens barrel having the same Zoom lens system and lens barrel having the same

2007-04-17

2007-04-17

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S687000

Reexamination Certificate

active

11454101

ABSTRACT:
A zoom lens system, in order from the object side to the image side, comprises: a first lens unit having positive optical power; a second lens unit that includes a reflective optical element having a reflecting surface for bending object light and that has negative optical power; and a subsequent lens unit including more than one lens unit having positive optical power, and that satisfies the condition: −5.70<f1/f2<−2.00 (Z=fT/fW>5.0, f1is the composite focal length of the first lens unit, f2is the composite focal length of the second lens unit, fWis the focal length of the entire zoom lens system at a wide-angle limit, fTis the focal length of the entire zoom lens system at a telephoto limit, Z is the magnification variation ratio), and is held in a compact lens barrel.

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