Variable-power optical system and imaging device

Details Variable-power optical system and imaging device Variable-power optical system and imaging device

2008-03-19

2009-12-08

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S726000, C359S687000, C396S072000, C348S240300, C348S344000

Reexamination Certificate

active

07630138

ABSTRACT:
A variable-power optical system includes, in order from an object side, first to fifth lens groups. The first and third lens groups are fixed at a time of varying magnification and at a time of focusing. The second, fourth and fifth lens groups are movable at the time of varying magnification. The first, third and fourth lens groups have positive refractive powers. The second and fifth lens groups have negative refractive powers. The fourth lens group has a focusing function. The following conditional expressions are satisfied.in-line-formulae description="In-line Formulae" end="lead"?0.4<fw/f1<0.8in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.5<|f2/fw|<0.8in-line-formulae description="In-line Formulae" end="tail"?where fw denotes a focal length of the whole system at an wide end, f1denotes a focal length of the first lens group, and f2denotes a focal length of the second lens group.

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