Zoom lens for use in projection devices

Details Zoom lens for use in projection devices Zoom lens for use in projection devices

2007-12-18

2008-10-21

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000, C359S683000, C359S685000, C359S740000, C359S770000

Reexamination Certificate

active

07440194

ABSTRACT:
An exemplary zoom lens for use in projection technology includes, in this order from the magnification side to the minification side thereof, a first lens group having negative refraction of power, a second lens group having positive refraction of power, a third lens group having positive refraction of power, a fourth lens group having negative refraction of power, and a fifth lens group having positive refraction of power, wherein the zoom lens satisfies the formulas: −1.5<F1/Fw<−1.3, 1.5<F2/Fw<1.8, 1.8<F3/Fw<2.2, −10<F4/Fw<−5, and 2.3<F5/Fw<2.8, where F1, F2, F3, F4, F5, and Fw respectively represent the effective focal length of the first lens groups, the second lens group, the third lens group, the fourth lens group, the fifth lens group, and the shortest effective focal length of the zoom lens.

REFERENCES:
patent: 7079324 (2006-07-01), Yamasaki
patent: 7190528 (2007-03-01), Inoko
patent: 2004/0190155 (2004-09-01), Nagahara
patent: 2005/0036206 (2005-02-01), Wada
patent: 2007/0058267 (2007-03-01), Kawana
patent: 2007/0103793 (2007-05-01), Inoko

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