FAST LENS Russian patent published in 2009 - IPC G02B9/60 G02B11/30 G02B13/14 

FIELD: physics; optics.

SUBSTANCE: lens consists of four components. The first component - positive and consisting from single convexo-convex and plano-concave lenses. The second - single positive meniscus converted by protuberant surface to image. The third - positive, conglutinated from convexo-convex and plano-concave lenses. The fourth - converted by incurvation to image plus meniscus. In the first builder the radius of curvature of the second surface of convexo-convex lens on the module is bigger than radius of curvature of the first surface of the subzero lens, and the radius of curvature of protuberant surface of meniscus of the second component is equal to radius of curvature of the first surface of the subzero lens of the first builder. The convexo-convex lenses of the first and third components are executed symmetrical and from one material.

EFFECT: angular aperture increase at high quality of image and pinch of adaptability to manufacture of manufacturing of objective at the expense of equality of curvature of a part of optical surfaces and replacement of spherical surfaces by the flat.

2 cl, 1 dwg