Patent ID: 9664883
Date: 2017-05-30
CPC Classifications: G02B

Claim:
1. An image display device configured to project an image onto a target projection surface and display a magnified image of the image, wherein the image display device uses a projection zoom lens consisting of first to fifth lens groups arranged in order from the magnification side toward the reduction side, the first lens group has negative refractive power, the second lens group has negative refractive power, the third lens group has positive refractive power, and in magnification change, the first lens group is fixed, and each of the second to fourth lens groups are moved toward the reduction side or magnification side, wherein the fifth lens group includes a lens that is closest to the reduction side of all lenses within the image display device and is moved toward the magnification side in the magnification change from a wide angle end to a telephoto end, wherein the second lens group is monotonously moved from the magnification side to the reduction side in the magnification change from the wide angle end to the telephoto end, and wherein in the projection zoom lens,