Zoom lens system

Details Zoom lens system Zoom lens system

2007-08-07

2007-08-07

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

11315492

ABSTRACT:
A zoom lens system includes a negative first lens group, a variable diaphragm, a positive second lens group, in this order from the object.Zooming is performed by moving the negative first lens group and the positive second lens group.The negative first lens group is constituted by at least two negative lens elements and at least two positive lens elements.The zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?1.5<|f1/fw|<1.8  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.0<|f2/(fw×ft)1/2<1.3  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.0<|f2/f1|<1.2  (3)in-line-formulae description="In-line Formulae" end="tail"?whereinf1designates the focal length of the negative first lens group;f2designates the focal length of the positive second lens group;fw designates the focal length of the entire the zoom lens system at the short focal length extremity; andft designates the focal length of the entire the zoom lens system at the long focal length extremity.

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English language Abstract of JP 10-282417.
English language Abstract of JP 11-30748.
English language Abstract of JP 11-160619.
English language Abstract of JP 2001-350089.
English language Abstract of JP 2002-82283.

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