Zoom projection lens
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United States of America Patent
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Dec 4, 2012
Grant Date -
May 3, 2012
app pub date -
Nov 30, 2010
filing date -
Oct 28, 2010
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A zoom projection lens includes, in the order from the magnification side to the minification side thereof, a first lens group with negative refraction power, a second lens group with positive refraction power, a third lens group with positive refraction power, a fourth lens group with negative refraction power, and a fifth lens group with positive refraction power. The first lens group, the second lens group, the third lens group, and the fourth lens group are movably positioned. The fifth lens group is immovably positioned. The zoom projection lens satisfying the formulae: 1.0<|F1/Fw|<1.3; 2.5<|F3/Fw|<2.7; 2.81<|F5/Fw|<2.83; and 0.21<|F2/F4|<0.24, wherein F1-F5 respectively represent the effective focal lengths of the first, second, third, fourth, and fifth lens groups, Fw represents the shortest effective focal length of the zoom projection lens.
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Cited Art Landscape
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