Zoom lens and projection display device using the zoom lens

Details Zoom lens and projection display device using the zoom lens Zoom lens and projection display device using the zoom lens

2007-06-05

2007-06-05

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

11172851

ABSTRACT:
A zoom lens for a projection display device includes, in order from the enlarging side, a first lens group having negative refractive power and that is stationary during zooming, second and third lens groups having positive refractive power, a fourth lens group that has refractive power that is much weaker in absolute value than the refractive powers of the other lens groups, and a fifth lens group having positive refractive power and that is stationary during zooming. The second, third, and fourth lens groups move with coordinated movements continuously toward the enlarging side during zooming from the wide-angle end to the telephoto end of the zoom range. The zoom lens satisfies certain conditions related to focal lengths of the zoom lens and lens groups and distances along the optical axis. A projection display device uses the zoom lens.

REFERENCES:
patent: 5416639 (1995-05-01), Yamanashi
patent: 6515803 (2003-02-01), Hirose
patent: 6809877 (2004-10-01), Nagahara
patent: 7009776 (2006-03-01), Wada
patent: 2000-137165 (2000-05-01), None
patent: 2001-91829 (2001-04-01), None
patent: 2001-100100 (2001-04-01), None
patent: 2002-72094 (2002-03-01), None

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