Zoom lens and image projection apparatus having the same

Details Zoom lens and image projection apparatus having the same Zoom lens and image projection apparatus having the same

2006-03-21

2006-03-21

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

07016118

ABSTRACT:
The present invention discloses a zoom lens which reduces the size of an entire lens system, effectively corrects various types of aberration accompanying zooming and has good optical performance over the entire screen. The zoom lens comprises, in order from a front side to a rear side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, a fifth lens unit having a positive or negative refractive power and a sixth lens unit having a positive refractive power and satisfies the set forth conditions.

REFERENCES:
patent: 6496310 (2002-12-01), Fujimoto
patent: 6636361 (2003-10-01), Wada
patent: 6785055 (2004-08-01), Nishikawa et al.
patent: 2001/0050818 (2001-12-01), Wada et al.
patent: 2001-108900 (2001-04-01), None
patent: 2001-235679 (2001-08-01), None

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