Zoom lens system

Details Zoom lens system Zoom lens system

2005-10-25

2005-10-25

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

06958866

ABSTRACT:
A zoom lens system includes a positive first lens group, a positive second lens group, a diaphragm, and a negative third lens group. The first through third lens groups move in an optical axis direction for zooming. The positive first lens group includes a negative lens element, and at least one positive lens element. The negative lens element is positioned at the most object-side of the positive first lens group, and is provided with a concave surface on the object-side surface thereof. The zoom lens system satisfies a number of specified conditions.

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English Language Abstract of JP 2-135312, May 24, 1990.
English Language Abstract of JP 8-179215.
English Language Abstract of JP 9-179028.
English Language Abstract of JP 10-260354.

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