Zoom lens system

Details Zoom lens system Zoom lens system

2007-07-31

2007-07-31

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000

Reexamination Certificate

active

11187969

ABSTRACT:
A zoom lens system includes a negative first lens group, a diaphragm, and a positive second lens group, in this order from the object. Zooming is performed by moving the negative first lens group and the positive second lens group along an optical axis of the zoom lens system. The negative first lens group includes a negative first lens element, a negative second lens element, and a positive third lens element, in this order from the object.

REFERENCES:
patent: 5910860 (1999-06-01), Ozaki et al.
patent: 6025961 (2000-02-01), Kohno et al.
patent: 6169635 (2001-01-01), Ozaki et al.
patent: 6268964 (2001-07-01), Ozaki et al.
patent: 10-282416 (1998-10-01), None
patent: 2001-194589 (2001-07-01), None
patent: 2002-244038 (2002-08-01), None
English language Abstract of JP 10-282416.

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