Patent attributes
A projection zoom lens includes six lens groups, four of which move along the optical axis during zooming. Of the lens groups that move during zooming, the one nearest the reducing side moves to a position closest to the enlarging side at an intermediate position of zooming between the wide-angle end and the telephoto end, and a lens group that does not move during zooming is located on the reducing side of the lens group nearest the reducing side that moves during zooming. The projection zoom lens satisfies specified conditions. From the enlarging side, the first lens group has negative refractive power while all the other lens groups except the fifth lens group are required to have positive refractive power. A projection display device is also disclosed.
