Large zoom ratio zoom lens

Details Large zoom ratio zoom lens Large zoom ratio zoom lens

2006-08-01

2006-08-01

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S687000

Reexamination Certificate

active

07085069

ABSTRACT:
A large zoom ratio zoom lens includes four lens groups, a first lens group of positive refractive power, a second lens group of negative refractive power, a third lens group, and a fourth lens group of positive refractive power. The second and third lens groups move for zooming. The first lens group includes, from the object side, a fixed lens subgroup of negative refractive power, a lens subgroup of positive refractive power that moves for focusing adjustment, and a fixed lens subgroup of positive refractive power. The lens subgroup that moves for focusing includes a lens element of negative refractive power on its object side and two lens elements of positive refractive power. To suppress aberrations, specified conditions related to radii of curvature of lens elements and various internal focal lengths are satisfied. The zoom lens also minimizes fluctuations in the angle of view at the wide-angle end during focusing.

REFERENCES:
patent: 5966246 (1999-10-01), Yoshikawa
patent: 6278559 (2001-08-01), Yahagi
patent: 6545818 (2003-04-01), Usui et al.
patent: 2001-116993 (2001-04-01), None
patent: 3376177 (2002-11-01), None
discussed at page 2 of spec; English Abstract attached.

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