PROJECTION HIGH-APERTURE LENS Russian patent published in 2010 - IPC G02B9/64 G02B13/24 

FIELD: optics.

SUBSTANCE: lens comprises five components before aperture diaphragm. The fifth and sixth components are separated with large air gap. The first and second components are negative menisci, which are inverted with their concave surfaces to space of images. The third component is negative meniscus, which is inverted by its convex side to space of images, the fourth one is positive lens, the fifth one is positive meniscus inverted with its concave side to space of images, the sixth one is negative and is glued of convexo-convex and concavo-concave lenses, the seventh one is convexo-convex lens, the eighth one is positive meniscus inverted by its concave side to space of images, the ninth one is a concavo-concave lens, the tenth one is a positive lens, the eleventh one is glued of negative meniscus, which is inverted with its concave surface to space of images, and positive lens, the twelfth one is a negative lens.

EFFECT: increased angle of view field and enlarged relative opening with provision of high image quality.

2 dwg