Zoom lens
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United States of America Patent
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Dec 24, 2013
Grant Date -
Dec 8, 2011
app pub date -
Feb 25, 2010
filing date -
Feb 26, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A zoom lens comprising sequentially from an object side 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; a fourth lens group having a negative refractive power; and a fifth lens group having a positive refractive power and formed by a cemented lens alone that includes a negative lens and a positive lens. The zoom lens zooms from a wide angle edge to a telephoto edge by moving the second lens group along an optical axis, from the object side toward the image plane side. The zoom lens performs focusing and corrects image plane variation accompanying zoom by moving the fourth lens group along the optical axis, and corrects image blur caused by minute vibrations by moving the entire fifth lens group in a direction orthogonal to the optical axis.
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