Zoom lens, and an imaging apparatus using such zoom lens

Details Zoom lens, and an imaging apparatus using such zoom lens Zoom lens, and an imaging apparatus using such zoom lens

2006-09-19

2006-09-19

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000

Reexamination Certificate

active

07110186

ABSTRACT:
The zoom of this invention comprises a first lens group having a positive refracting power, a second lens group having an negative refracting power, a third lens group having a positive refracting power, a fourth lens group having a positive refracting power, and a fifth lens group having a negative refracting power from an object side in this order, wherein a zooming is carried out by moving the second and the fourth lens groups, wherein the first lens group comprises, a foreside lens group having an negative refracting power, an optical element for folding an optical path, and a backside lens group having a positive refracting power from the object side, and a condition of 1.0<β5<1.9 is satisfied, provided that an imaging power of the fifth lens group where an object distance is at infinity is β5.

REFERENCES:
patent: 6754446 (2004-06-01), Hagimori et al.
patent: 2002/0012174 (2002-01-01), Horiuchi
U.S. Appl. No. 10/558,064, filed Nov. 23, 2005, Sueyoshi.

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