Zoom lens system and optical apparatus including the same

Details Zoom lens system and optical apparatus including the same Zoom lens system and optical apparatus including the same

2008-02-25

2009-11-17

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S689000

Reexamination Certificate

active

07619834

ABSTRACT:
A zoom lens system includes a first lens unit having a negative refractive power, at least one lens unit having a positive refractive power, and an optical element composed of a material having an Abbe number and a partial dispersion that satisfy a predetermined condition. The first lens unit, an aperture stop, and the at least one lens unit are arranged in this order from the object side to the image side. The zoom lens system performs zooming while changing the distance between the lens units. The focal length fNof the optical element, the distance Lt from the aperture stop to the optical element in the telephoto end state, the overall length of the zoom lens system Tt in the telephoto end state, and the focal lengths fw and ft in the wide-angle end and telephoto end states are set at appropriate values.

REFERENCES:
patent: 6014267 (2000-01-01), Tsurutani
patent: 6809879 (2004-10-01), Mihara
patent: 6850373 (2005-02-01), Mihara
patent: 7079328 (2006-07-01), Kuba
patent: 7184221 (2007-02-01), Misaka
patent: 2004-117828 (2004-04-01), None

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