| 摘要 |
FIELD: physics.SUBSTANCE: lens consists of two components separated by an aperture diaphragm. The first component with optical power ?comprises a meniscus with optical power ?, facing the image with its concave side. The second component with optical power ?comprises a plane-convex lens with optical power ?and a glued lens with optical power ?. The first component in front of the aperture diaphragm includes a plane-convex lens with optical power ?, and the plane-convex lens of the second component is glued. The optical power of the lenses and components satisfies the following conditions: 0.25<|?/?|<0.35, 0.48<?/?<0.58, 0.3<?/?<0.4, 0.5<?/?<0.6, 0.05<?/?<0.15, where ? is the optical power of the lens overall.EFFECT: providing good image quality in the entire measurement interval of the working section, smaller inclination angle of the main beam and high relative illumination at the edge of the image field.1 dwg, 1 ex |
