Zoom lens unit and information device

Details Zoom lens unit and information device Zoom lens unit and information device

2011-04-26

2011-04-26

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07933074

ABSTRACT:
A zoom lens unit, including in order from an object side to an image side: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; and a fourth lens group having a positive refracting power, an aperture stop being disposed on an object side of the third lens group, wherein the third lens group has at least two positive lenses and one negative lens, wherein all the positive lenses of the third lens group satisfy the following formula: (1) −0.005865νd3p+0.93226<θgF3p<−0.005865νd3p+0.95226, where, νd3prepresents an Abbe number of each of the positive lenses of the third lens group, and θgF3prepresents a partial dispersion ratio of each of the positive lenses of the third lens group, defined by the formula: θgF3p=(ng−nF)/(nF−nC).

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