| 摘要 |
The projection lens comprises: the first of the components of negative power, facing with its concave surface to the object and cemented of negative and positive menisci, the second component comprising a positive meniscus, having the concave surface facing an object side, the third one being a biconvex lens, the forth one being a positive meniscus, having the concave surfaces facing an image side, the fifth one being negative, faced with its concave surface to the image and being cemented of biconvex and biconcave lenses. The technical objective is that relative aperture (1:1.8) is increased, brightness at the image edge field is enhanced against that in the centre (0.91), in the image, formed by the lens, the required value of negative distortion is provided (−3%), an image quality is enhanced, conditions of lens operating are provided for the object, located at the finite distance. |
