| 摘要 |
<p>In order to provide a zoom lens for projection which exhibits excellent correction of field curvature due to focusing, even if the angle of view is widened, essentially, a zoom lens for projection is configured from: a first lens group (G1) which has negative refractive power, is arranged furthest toward the magnification side, and is fixed during a change in magnification; a second lens group (G2) which has negative refractive power, is arranged further toward the reduction side than the first lens group (G1), and is fixed during a change in magnification; a final lens group (G6) which has positive refractive power, is arranged furthest toward the reduction side, and is fixed during a change in magnification; and three lens groups (G3, G4, G5) which are arranged between the final lens group (G6) and the second lens group (G2), and which move during a change in magnification. Furthermore, the reduction side is a telecentric structure, and focusing is carried out by moving only the second lens group (G2).</p> |
