Zoom lens having a first optical system formed on a magnification side, and a second optical system formed on the reduction side, with an intermediate image formed therebetween, projection display device, and imaging apparatus using the same

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 toward a reduction side:

• a first optical system;
• and
• a second optical system,
• wherein the intermediate image is positioned between the first optical system and the second optical system,
• wherein the first optical system consists of, in order from the magnification side, a first lens group that has a negative refractive power as a whole, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, and the second lens group, the third lens group, and the fourth lens group move by changing spacings between groups adjacent to each other in an optical axis direction during zooming,
• wherein the first optical system has three or more negative lenses continuously in order from a position closest to the magnification side,
• wherein the first optical system has a first cemented lens which is formed by cementing a positive lens, a negative lens, and a positive lens in order from the magnification side, and an Abbe number of each of the two positive lenses within the first cemented lens at a d line is larger than that of the negative lens within the first cemented lens, and
• wherein a second cemented lens, which is formed by cementing a negative lens and a positive lens and has a positive refractive power as a whole, is disposed to be closest to the magnification side of the second optical system.