ZOOM LENS AND IMAGE PICKUP DEVICE INCLUDING THE SAME

摘要

A zoom lens includes a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, in order from an object side to an image side. During zooming, the first lens unit is not moved, and the second lens unit, the third lens unit, and the fourth lens unit are moved to change an interval between adjacent lens units. A moving amount m2 of the second lens unit during zooming from a wide angle end to a telephoto end, a focal length f2 of the second lens unit, and a focal length fw of a whole system at the wide angle end are each set appropriately.

主权项

1. A zoom lens comprising, in order from an object side to an image side:
a first lens unit having positive refractive power; a second lens unit having negative refractive power; a third lens unit, having positive refractive power; and a fourth lens unit having positive refractive power, wherein during zooming, the first lens unit is not moved, and the second lens unit, the third lens unit, and the fourth lens unit are moved to change an interval between adjacent lens units, and wherein the following conditional expressions are satisfied
−4.9