Zoom lens system

Details Zoom lens system Zoom lens system

2007-06-05

2007-06-05

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

11390172

ABSTRACT:
A zoom lens system includes a negative first lens group, a diaphragm, a positive second lens group, and a positive third lens group, in this order from the object. Zooming is performed by moving the negative first lens group and the positive first lens group in the optical axis direction. The zoom lens system includes six lens elements divided into lens group as follows: a negative first lens element and a positive second lens element, in this order from the object, constitute the negative first lens group; a positive third lens element, a negative fourth lens element and a positive fifth lens element, all of which are bonded to each other, in this order from the object, constitute the positive second lens group; and a positive sixth lens element constitutes the positive third lens group.

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English Language Abstract of JP 2003-121743.
English Language Abstract of JP 2003-140047.

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