Zoom lens, image pickup apparatus and digital equipment
AssigneeKonica Minolta Opto, Inc.
InventorYoshihito Souma
Life of this patent
Estimating the term…
Abstract
A zoom lens includes a first lens group having a negative optical power and including a reflection optical element; a second lens group having a positive optical power; a third lens group having a negative optical power; a fourth lens group having a positive optical power; and, a fifth lens group. At least the second lens group and the fourth lens group move to the object side of the zoom lens for varying a power of the zoom lens from a wide-angle end to a telephoto end. The zoom lens further includes a diaphragm and the diaphragm moves to the object side for varying the power of the zoom lens from the wide-angle end to the telephoto end.
Claims15
A zoom lens comprising, in order from an object side thereof:
- a first lens group having a negative optical power and comprising a reflection optical element for bending an optical path by almost 90 degrees;
- a second lens group having a positive optical power;
- a third lens group having a negative optical power;
- a fourth lens group having a positive optical power;
- and,
- a fifth lens group,
- wherein the zoom lens further comprises a diaphragm arranged between a surface closest to an image side of the zoom lens in the third lens group and a surface closest to the image side in the fourth lens group,
- at least the second lens group and the fourth lens group move to the object side so as to reduce a distance between the first lens group and the second lens group and a distance between the third lens group and the fourth lens group, for varying a power of the zoom lens from a wide-angle end to a telephoto end, and
- the diaphragm moves to the object side for varying the power of the zoom lens from the wide-angle end to the telephoto end.
Dependencies are inferred from the claim text.