Patent ID: 7567389
Filing Date: 2009-07-28
Classification: G02B

Abstract:
1. 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.