Projection zoom lens and projection type display device

摘要

A projection zoom lens in which a magnification change operation is performed by moving three to four lens groups as moving groups, wherein a first lens group, which is a lens group on the most-magnification side, substantially consists of a moving group having a negative refractive power; a lens group on the most-reduction side is composed of a moving group having a positive refractive power; and the first lens group which is the lens group the most-magnification side substantially consists of two lenses. In this case, conditional formula (1) below is satisfied, where fw is the focal length of the entire system at the wide angle end and fm is the focal length of the lens group on the most-magnification side:
−3.5This achieves miniaturization and cost reduction, and corrects various aberrations satisfactorily.

主权项

1. A projection zoom lens in which a magnification change operation is performed by moving groups of lenses, the projection zoom lens comprising:
a lens group on a most-magnification side that consists of a moving group having a negative refractive power; and a lens group on a most-reduction side that consists of a moving group having a positive refractive power, which includes a biconcave lens, a positive lens, and a negative lens with a concave surface toward the most-magnification side in this order from the most-magnification side, wherein the lens group on the most-magnification side consists of two lenses, and wherein conditional formula (1) below is satisfied:
−3.5