| 摘要 |
FIELD: physics; optics. ^ SUBSTANCE: lens consists of two components installed in succession along the beam path. The first component is double-lens, which consists of a double-convex lens and a negative meniscus lens glued together; convex side of the latter is at the image side. The second component is a single positive meniscus lens with its concave side to the image. |R2|/|R4|=1, |R3|/|R5|=1, where R2, R3, R4, R5 - radii of curvature of the 2nd, the 3rd, the 4th and the 5th optical faces, respectively, along the beam path. ^ EFFECT: increased focal distance, aperture ratio and enhanced producibility together with high image quality. ^ 3 cl, 1 dwg |
