Patent ID: 8328369
Filing Date: 2012-12-11
Classification: G02B

Abstract:
1. A projecting zoom lens, comprising sequentially from the magnification side thereof: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a negative 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 a reduction side of the zoom lens is formed as a telecentric system, each distance between respective lenses of the second and sixth lens groups varies in a zooming, the third lens group moves along an optical axis from a magnification side to the reduction side as the zoom lens goes from a wide angle end toward a tele end in the zooming, and a following conditional expression (1) is satisfied, that is, where Mi: a movement of the zooming of a i-th lens group along the optical axis from the wide angle end to the tele end of the zooming lens.