Zoom lens system and image pickup apparatus including the same

Details Zoom lens system and image pickup apparatus including the same Zoom lens system and image pickup apparatus including the same

2011-07-19

2011-07-19

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07982971

ABSTRACT:
A zoom lens system includes, in order of from an object side to an image side: a first lens unit which does not move for zooming; a second lens unit moving during zooming; a third lens unit moving during zooming; and a fourth lens unit which does not move for zooming. The first lens unit includes a negative lens, a positive lens, a positive lens, and a positive lens, and when an Abbe number ν and a partial dispersion ratio θ of a material of the negative lens are denoted respectively by νn and θn, an average value of Abbe numbers ν and an average value of partial dispersion ratios θ of materials of the positive lenses are denoted respectively by νpa and θpa, and a refractive power of the negative lens is denoted by φn, the following expressions are satisfied: −1.75×10−3<(θpa−θn)/(νpa−νn); and 9.1×10−3(1/mm)<|φn|.

REFERENCES:
patent: 5831771 (1998-11-01), Suzuki
patent: 6825990 (2004-11-01), Yoshimi et al.
patent: 2011/0037878 (2011-02-01), Wakazono et al.
patent: 2011/0037880 (2011-02-01), Sakamoto

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