Zoom lens and projector with zoom lens

Details Zoom lens and projector with zoom lens Zoom lens and projector with zoom lens

2008-07-01

2008-07-01

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S687000

Reexamination Certificate

active

11796702

ABSTRACT:
A zoom lens includes a first lens group having positive or negative refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power. A variable power is set such that the first and fourth lens group are left fixed, the second lens group is made to move from a magnifying side to a contracting side over a range from a wide angle end to an intermediate area and is made to move on an optical axis from the contracting side to the magnifying side over a range from the intermediate area to a telephoto end, and the third lens group is made to move on the optical axis from the contracting side to the magnifying side over a range from the wide angle end to the telephoto end.

REFERENCES:
patent: 6515803 (2003-02-01), Hirose
patent: 2004-271668 (2004-09-01), None

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