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

2007-03-13

2007-03-13

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S650000, C359S651000, C359S680000, C359S682000, C359S686000, C359S689000, C359S691000, C359S713000, C359S714000, C359S715000, C359S716000, C359S717000, C359S762000

Reexamination Certificate

active

11360232

ABSTRACT:
A zoom lens comprises a plurality of lens units including a first lens unit disposed most adjacent to an enlargement side and having negative refractive power, wherein one or more lens units of the plurality of lens units are moved in the direction of the optical axis thereof during magnification change, and wherein the first lens unit includes a 1-1st lens unit comprising at least one lens of negative refractive power and moved during focusing and a 1-2nd lens unit having positive refractive power, and fixed during focusing.

REFERENCES:
patent: 4124274 (1978-11-01), Tanaka et al.
patent: 6580564 (2003-06-01), Nagahara
patent: 6888682 (2005-05-01), Kawakami
patent: 2001/0050818 (2001-12-01), Wada et al.
patent: 10-186235 (1998-07-01), None
patent: 2001-235679 (2001-08-01), None
patent: 2002-357771 (2002-12-01), None
patent: 2004-226803 (2004-08-01), None

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