Patent ID: 9164264
Filing Date: 2015-10-20
Classification: G02B,G03B

Abstract:
1. A projection zoom lens substantially consisting of a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, a fourth lens group having a negative power, a fifth lens group having a positive power, and a sixth lens group having a positive power arranged in this order from the magnification side and is configured telecentric on the reduction side, wherein: the projection zoom lens is configured such that the first and sixth lens groups are fixed while the second to fifth lens groups are moved independently of each other along the optical axis at the time of zooming; the fifth lens group is composed of a plurality of lenses and a biconvex lens is disposed on the most magnification side; and the zoom lens satisfies conditional expressions (1) and (2) given below: where: R R νd