Patent ID: 7532410
Filing Date: 2009-05-12
Classification: G02B

Abstract:
1. A projecting zoom lens comprising, in order from a magnification side: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group having a positive or negative refractive power; and a sixth lens group having a positive refractive power; wherein the third to fifth lens groups are moved along an optical axis toward the magnification side during zooming from a wide-angle end state to a telephoto end state and the following Conditional Expressions (1) to (2) are satisfied: where f1 denotes a focal length of the first lens group, fw denotes a focal length of the projecting zoom lens at the wide angle end state, and νd4 denotes an Abbe number of glass material of which a positive lens contained in the fourth lens group is made.