Zoom lens and electronic imaging apparatus using the same

Details Zoom lens and electronic imaging apparatus using the same Zoom lens and electronic imaging apparatus using the same

2006-09-19

2006-09-19

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

07110187

ABSTRACT:
A zoom lens in which when the magnification is changed in the range from a wide-angle position to a telephoto position in infinite object point focusing, spacing between a first lens unit, with negative refractive power as a whole, having a negative lens and a positive lens, and a second lens unit, with positive refractive power as whole, having a positive lens and a cemented lens component constructed with a positive lens and a negative lens, is narrowed and spacing between the second lens unit and a third lens unit, a single positive lens component, is widened, and the zoom lens satisfies the following condition: 2.1<|β2T|<2.8 where β2T is the magnification of the whole of the second lens unit at the telephoto position in the infinite object point focusing.

REFERENCES:
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patent: 6646815 (2003-11-01), Nobe
patent: 6856467 (2005-02-01), Iyama
patent: 6900947 (2005-05-01), Nakatani et al.
patent: 6972908 (2005-12-01), Noda
patent: 6999242 (2006-02-01), Nanba et al.
patent: 2002-372667 (2002-12-01), None

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