ZOOM LENS FOR PROJECTION, PROJECTOR DEVICE AND IMAGING APPARATUS

PROBLEM TO BE SOLVED: To attain a new zoom lens for projection which enlarges a plane image in a variable magnification state and projects and forms an image. SOLUTION: The zoom lens for projection which enlarges the plane image in the variable magnification state and projects and forms the image is constituted by arranging a first lens G1 to a seventh lens group G7 in order from an enlargement side. The first lens group G1 has negative refractive power; the third lens group G3, the fourth lens group G4 and the fifth lens group G5 all have positive refractive power; the sixth lens group G6 has negative refractive power; the seventh lens group G7 has positive refractive power; and the second lens group G2 has negative or positive refractive power. COPYRIGHT: (C)2010,JPO&INPIT