Zoom lens system
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United States of America Patent
Stats
-
Mar 31, 2009
Grant Date -
Mar 29, 2007
app pub date -
Sep 8, 2006
filing date -
Sep 28, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A zoom lens system is disclosed which includes a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with positive optical power, arranged in that order from an object side to an image side. The zoom lens system performs zooming by changing distances between the lens groups. The first lens group includes at least two negative lenses, and one of the negative lenses is adjacent to the second lens group and satisfies the following criteriawhere R1 is the curvature radius of the first surface facing toward the object side, and R2 is the curvature radius of the second surface facing toward the image side.
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