Wide-angle zoom lens system

Details Wide-angle zoom lens system Wide-angle zoom lens system

2005-02-08

2005-02-08

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S687000

Reexamination Certificate

active

06853497

ABSTRACT:
A wide-angle zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in this order from the object. Upon zooming from the short focal length extremity to the long focal length extremity, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group decreases.

REFERENCES:
patent: 5668668 (1997-09-01), Shibayama et al.
patent: 5867326 (1999-02-01), Yamamoto
patent: 6246529 (2001-06-01), Sensui
patent: 6327098 (2001-12-01), Sensui
patent: 470706 (1992-03-01), None
patent: 8248312 (1996-09-01), None
patent: 2000131611 (2000-05-01), None
patent: 2000131612 (2000-05-01), None
English Language Translation of JP Appln. No. 4-70706.
Camera Test, Photo Industry, vol. 59, No. 11, Nov. 11, 2001, p. 67, together with an English Language Translation.

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