Projection zoom lens

Details Projection zoom lens Projection zoom lens

2006-05-02

2006-05-02

Dang, Hung X (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S691000, C359S649000

Reexamination Certificate

active

07038857

ABSTRACT:
A projection zoom lens includes, from an image side to an object side, a first lens group having a negative refractive power, consisting of a number of lens elements and being movable along the optical axis of the projection zoom lens; a second lens group having a positive refractive power, consisting of a number of lens elements and being movable along the optical axis of the projection zoom lens; and an aperture stop arranged between two lens elements of the second lens group and being axially movable therewith.

REFERENCES:
patent: 5619381 (1997-04-01), Doug
patent: 5936780 (1999-08-01), Chuang et al.
patent: 6147812 (2000-11-01), Narimatsu et al.
patent: 6590716 (2003-07-01), Shuji
patent: 6801367 (2004-10-01), Nagahara

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