Zoom lens and image pickup apparatus equipped with zoom lens
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United States of America Patent
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Mar 25, 2014
Grant Date -
Dec 6, 2012
app pub date -
May 23, 2012
filing date -
May 31, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A zoom lens includes, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power. All of the lens units are moved during zooming from a wide-angle end to a telephoto end. An aperture stop is arranged on the image side of the third lens unit. A distance T23 from a lens surface closest to the image side in the second lens unit to a lens surface closest to the object side in the third lens unit when the zoom lens is at the telephoto end, a focal length fT of the entire zoom lens at the telephoto end, and focal lengths f1, f2, and f3 of the first, second, and third lens units, respectively, are set based on predetermined mathematical conditions.
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