Zoom lens and image acquisition apparatus incorporating the...

Details Zoom lens and image acquisition apparatus incorporating the... Zoom lens and image acquisition apparatus incorporating the...

2007-10-02

2007-10-02

Dang, Hung (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S676000

Reexamination Certificate

active

11650997

ABSTRACT:
A zoom lens having an effective focal length fw for the wide angle mode comprises a first lens group, a second lens group and a third lens group. The first lens group has a negative effective power and an effective focal length f1, wherein 2.1<|f1/fw|<2.6. The first lens group comprises a first lens and a second lens. The first lens has a first negative power and at least a first concave aspheric lens surface. The second lens has a first positive power. The second lens group has a first positive effective power and an effective focal length f2, wherein 1.5<|f2/fw|<1.8. The second lens group comprises a third lens and a fourth lens. The third lens has a second positive power and at least a second aspheric lens surface. The fourth lens has a third positive power. The third lens group has a second positive effective power.

REFERENCES:
patent: 6710934 (2004-03-01), Park
patent: 6853498 (2005-02-01), Kim et al.
patent: 7106522 (2006-09-01), Park

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