High zoom-ratio zoom lens system

Details High zoom-ratio zoom lens system High zoom-ratio zoom lens system

2011-06-14

2011-06-14

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07961402

ABSTRACT:
A high zoom-ratio zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, a positive fifth lens group, and a negative sixth lens group, in this order from an object.Upon zooming from the short focal length extremity to the long focal length extremity, a distance between the positive first lens group and the negative second lens group increases, and a distance between the negative second lens group and the positive third lens group decreases.The high zoom-ratio zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?5.0<f1/|f2|<9.0(f2<0)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?4.1<f1/f5<6.0  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinf1designate the focal length of the positive first lens group;f2designate the focal length of the negative second lens group; andf5designate the focal length of the positive fifth lens group.

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