Zoom lens system and image pick-up apparaus

Details Zoom lens system and image pick-up apparaus Zoom lens system and image pick-up apparaus

2006-02-15

2009-06-09

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000

Reexamination Certificate

active

07545579

ABSTRACT:
There is provided a zoom lens system, compact and light in weight and having high image formation performance over the zoom entire range irrespective of object lens while covering the range from the broad angle side up to the telescopic end state side, which is used in video camera and/or digital still camera. A zoom lens system at least includes a first lens group GR1having positive refractive power, a second lens group GR2having negative refractive power, a third lens group GR3having positive refractive power, a fourth lens group GR4having positive refractive power, a fifth lens group GR5having weak refractive power (including refractive power=0), and a sixth lens group GR6having negative refractive power which are arranged in order from the object side to change spacings between the respective lens groups to thereby perform magnification changing or adjusting operation, wherein when group spacing between the i-th lens group and the j-th lens group at the wide-angle end state is DW(i-j), and group spacing between the i-th lens group and the j-th lens group at the telescopic end state is DT(i-j), the following conditional formulas (1), (2) and (3) are satisfied, and the fourth lens group GR4is moved in the optical axis direction so that focusing operation is performed.in-line-formulae description="In-line Formulae" end="lead"?DW(1-2)<DT(1-2)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?DW(2-3)>DT(2-3)  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?DW(5-6)>DT(5-6)  (3)in-line-formulae description="In-line Formulae" end="tail"?

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