PROJECTION LENS Russian patent published in 2011 - IPC G02B13/24 G02B9/60 

FIELD: physics.

SUBSTANCE: projection lens has an entrance pupil and five components placed in series on the path of optical radiation from the object to the image. The first component is divergent, faces the object with its concave surface and consists of glued diverging- and converging-meniscus lenses. The second component is a converging-meniscus lens whose concave surface faces the object. The third is a biconvex lens. The fourth component is a converging-meniscus lens whose concave surface faces the image. The fifth component is divergent, faces the image with its concave surface and consists of glued biconvex and biconcave lenses.

EFFECT: high aperture ratio, improved illumination at the edge of the image field and quality of the image, ensuring barrel distortion of the required value, ensuring operation of the lens with an object lying at a finite distance.

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