PROJECTION ZOOM LENS AND PROJECTION TYPE DISPLAY DEVICE

摘要

A projection zoom lens has a negative first lens group which is fixed when changing magnification, second through fifth lens groups that move when changing magnification, and a positive sixth lens group which is fixed when changing magnification, in this order from a magnification side. The reduction side is telecentric. When changing magnification from a wide angle end to a telephoto end, the second lens group moves toward the magnification side. The first and second lenses from the reduction side of the fifth lens group are a positive lens and a negative lens, respectively. The sixth lens group is constituted by a single positive lens. The projection zoom lens satisfies a predetermined Conditional Formula.

主权项

1. A projection zoom lens, substantially consisting of six lens groups, including:
a first lens group having a negative refractive power, which is fixed when changing magnification; second, third, fourth, and fifth lens groups that move when changing magnification; and a sixth lens group having a positive refractive power, which is fixed when changing magnification, provided in this order from a magnification side; the reduction side being telecentric; the second lens group being configured to move toward the magnification side when changing magnification from a wide angle end to a telephoto end; the first and second lenses from a reduction side of the fifth lens group being a positive lens and a negative lens, respectively; the sixth lens group being a single positive lens; and the projection zoom lens satisfying Conditional Formula (1) below:
−2.0