ZOOM LENS
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United States of America Patent
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Issued Date -
Sep 4, 2014
app pub date -
Jan 28, 2014
filing date -
Mar 1, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An embodiment of this invention provides a zoom lens, which comprises a plurality of lens groups in order from an object side to an image-forming side with positive, negative, positive, and positive refractive power respectively. The lens groups comprise a plurality of aspheric lenses and/or free form lenses and a plurality of plastic lenses. The zoom lens satisfies the following equation: DG/fw<3.5 and TTL/fw<15.5, wherein DG denotes the total summation of the thickness of each lens group, fw denotes the focal length of the zoom lens at the wide-angle end, and TTL denotes a total thickness of the zoom lens at the wide-angle end.
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