Zoom lens and image projection apparatus including the same

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

2010-09-15

2011-12-13

Greece, James (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

08077397

ABSTRACT:
A zoom lens includes, in order from an enlargement conjugate side to a reduction conjugate side, a first lens unit of negative refractive power; a second lens unit of positive refractive power; a third lens unit of positive refractive power, the third lens unit having at least three lens elements; a middle lens unit including at least one lens unit; and a last lens unit of positive refractive power. All the lens units, except the first lens unit and the last lens unit, move during zooming. The zoom lens satisfies appropriate conditions.

REFERENCES:
patent: 6888683 (2005-05-01), Itoh
patent: 2005/0200967 (2005-09-01), Yamasaki et al.
patent: 2006/0056043 (2006-03-01), Nakazawa et al.
patent: 2007/0229967 (2007-10-01), Nagahara
patent: 2007-271669 (2007-10-01), None

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