Variable focal length lens system

Details Variable focal length lens system Variable focal length lens system

2006-06-13

2006-06-13

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07061686

ABSTRACT:
A variable focal length lens system realizing compactness and high zoom ratio is provided. The lens system includes four lens groups that are, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power. When the state of lens group positions varies from a wide-angle end state to a telephoto end state, at least the first lens group is moved to the object such that a distance between the first and the second lens groups increases, a distance between the second and the third lens groups decreases, and a distance between the third and the fourth lens groups varies. An aperture stop is arranged in the vicinity of the third lens group. Given conditional expressions are satisfied.

REFERENCES:
patent: 4634236 (1987-01-01), Masumoto
patent: 4696553 (1987-09-01), Tsuji et al.
patent: 5412507 (1995-05-01), Sato
patent: 5572277 (1996-11-01), Uzawa et al.
patent: 6016228 (2000-01-01), Uzawa
patent: 6353506 (2002-03-01), Ohashi
patent: 6404561 (2002-06-01), Isono et al.
patent: 6456441 (2002-09-01), Hoshi
patent: 6633437 (2003-10-01), Hoshi et al.
patent: 2003/0063395 (2003-04-01), Saruwatari
patent: 57-5012 (1982-01-01), None
patent: 06003592 (1994-01-01), None
patent: 7-5361 (1995-01-01), None
patent: 2001-56436 (2001-02-01), None
patent: 2001-188170 (2001-07-01), None
patent: 2001-242379 (2001-09-01), None
patent: 2001-356269 (2001-12-01), None

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