Zoom lens system and image pick-up apparatus including same

Details Zoom lens system and image pick-up apparatus including same Zoom lens system and image pick-up apparatus including same

2007-06-05

2007-06-05

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000

Reexamination Certificate

active

11458768

ABSTRACT:
At least one exemplary embodiment is directed to a four-group zoom lens system including, in order from the object side to the image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power and including a negative first lens sub-unit and a positive second lens sub-unit in order from the object side to the image side, and a fourth lens unit having positive refractive power. During zooming, the second and fourth lens units can be moved along an optical axis and the second lens sub-unit can be moved substantially orthogonal to the optical axis. When f1 represents the focal length of the first lens unit, f3aand f3brepresents the focal length of the first and second lens sub-units, respectively, satisfy 0.4<f3b/f1<0.70 and 0.5<|f3b/f3a|<0.8.

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patent: 2002-244037 (2002-08-01), None

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