Zoom lens, projection display device, and imaging apparatus that forms an intermediate image at a postion conjugate to a reduction side imaging plane and causes the intermediate image to be re-imaged on a magnification side imaging plane

A zoom lens that forms an intermediate image at a position conjugate to a reduction side imaging plane and causes the intermediate image to be re-imaged on a magnification side imaging plane, the zoom lens consisting of, in order from a magnification side:

• a first lens group that remains stationary with respect to the reduction side imaging plane during zooming;
• a plurality of movable lens groups that move by changing spacings between the lens groups adjacent to each other in an optical axis direction during zooming;
• and
• a final lens group that remains stationary with respect to the reduction side imaging plane during zooming and has a positive refractive power as a whole,
• wherein at least two of the movable lens groups are positioned to be closer to a reduction side than the intermediate image at a wide-angle end,
• wherein a lens system closer to the reduction side than the intermediate image consists of, in order from the magnification side, a front group and a rear group,
• wherein the rear group is a group, which has a maximum number of lenses included therein, among lens groups of which own magnification side focal points are positioned to be closer to the magnification side than own lens surfaces closest to the magnification side at the wide-angle end, and
• wherein the following conditional expressions (1) and (2) are satisfied,
• 0.05<|fw|/frb<0.25 (1), and
• 1<Drv/Im ϕ<3 (2),
• where fw is a focal length of the zoom lens at the wide-angle end,
• frb is a focal length of the rear group at the wide-angle end,
• Drv is a distance on an optical axis from a lens surface of the front group closest to the reduction side to a lens surface of the rear group closest to the reduction side at the wide-angle end, and
• Im ϕ is an effective image circle diameter on the reduction side.