Zoom lens and imaging optical device including the same
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United States of America Patent
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Mar 27, 2012
Grant Date -
Nov 4, 2010
app pub date -
Mar 25, 2010
filing date -
Apr 29, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A zoom lens for an imaging optical device that includes a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; and a fourth lens group having a positive refractive power, arranged sequentially from an object side to an image side, and wherein each of the distances between the first lens group, the second lens group, the third lens group, and the fourth lens group varies during zooming, and wherein the first lens group comprises a doublet lens consisting of a negative lens and a positive lens, and the third lens group comprises a first positive lens, a second positive lens, a negative lens, and a third positive lens.
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