Image-taking apparatus

Details Image-taking apparatus Image-taking apparatus

2006-05-09

2006-05-09

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000

Reexamination Certificate

active

07042652

ABSTRACT:
A zoom lens system for forming an optical image of a subject on the image-sensing surface of an image sensor has three lens units, namely, from the object side thereof, a first lens unit having a negative optical power, a second lens unit having a positive optical power, and a third lens unit having a positive optical power, and achieves zooming by varying the distances between the individual lens units in such a way that, during zooming from the wide-angle end to the telephoto end, the distance between the first and second lens units decreases. The first lens unit is composed of two or more lens elements, and the first lens element, i.e., the lens element disposed at the object-side end of the first lens unit, and the last lens element, i.e., the lens element disposed at the image-side end of the third lens unit, are plastic lens elements. Moreover, a prescribed conditional formula is fulfilled.

REFERENCES:
patent: 6532114 (2003-03-01), Kohno et al.
patent: 6735020 (2004-05-01), Sekita
patent: 2003-177314 (A) (2003-06-01), None
patent: 2003-228002 (A) (2003-08-01), None

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