Zoom lens and image projection apparatus

Details Zoom lens and image projection apparatus Zoom lens and image projection apparatus

2009-09-21

2010-11-02

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

07826147

ABSTRACT:
A zoom lens includes a negative lens unit having a negative refractive power, at least one positive lens unit having a positive refractive power, an intermediate lens unit including a stop, and at least one reduction side lens unit, in order from a magnification conjugate side to a reduction conjugate side, at least two magnification side movable lens units in the negative lens unit and the at least one positive lens unit, and at least one reduction side movable lens unit in the at least one reduction side lens unit are moved during zooming, and conditions of 0.9<(XT·βTb·φW)/(XW·βWb·φT)<1.1, 0.9<φW/φT<1.1, 0.8<(βTS·βTb)/(βWS·βWb)<1.2, and 1.4<fT/fWare satisfied.

REFERENCES:
patent: 6785055 (2004-08-01), Nishikawa et al.
patent: 2001/0050818 (2001-12-01), Wada et al.
patent: 2005/0036206 (2005-02-01), Wada
patent: 2009/0015934 (2009-01-01), Amano
patent: 2002-350727 (2002-12-01), None
patent: 2004-085979 (2004-03-01), None
patent: 2008-052174 (2008-03-01), None

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