ZOOM LENS, AND VIDEO ENLARGING AND PROJECTING SYSTEM, VIDEO PROJECTOR, REAR PROJECTOR AND MULTI-VISION SYSTEM USING ZOOM LENS

摘要

PPROBLEM TO BE SOLVED: To provide a compact zoom lens whose distortion and lateral chromatic aberration are restrained to be small though it has long back focus in order to realize a bright and high-definition projector. PSOLUTION: In the zoom lens constituted of three or more lens groups, the 1st lens group 11 having positive refractive power and the 2nd lens group 12 having negative refractive power are arranged in this order as seen from a long conjugate distance side. A lens 12a, out of the lenses of the 2nd lens group 12, positioned the first as seen from the long conjugate distance side has positive refractive power. Thus, distortion aberration is restrained to be small. PCOPYRIGHT: (C)2004,JPO