HIGH-APERTURE WIDE-ANGLE LENS Russian patent published in 2013 - IPC G02B9/64 

FIELD: physics.

SUBSTANCE: lens has two components separated by an aperture diaphragm. The first component comprises a diverging meniscus whose concave surface faces the image space, a biconvex lens, a diverging meniscus whose concave surface faces the image space and a group of lenses. The second component consists of a converging biconvex lens, a diverging lens, a glued lens and two converging biconvex lenses. The group of lenses of the first component consists of three lenses: the first - a diverging meniscus whose convex surface faces the image space, the second - a biconvex lens and the third - a diverging meniscus whose concave surface faces the image space. In the second component, the diverging lens is glued and consists of a biconcave lens and a biconvex lens; the third lens consists of three glued components, the third additional component being a converging meniscus. Optical power values satisfy conditions given in the claim.

EFFECT: larger linear field of the image without deterioration in image quality, with simultaneous enlargement of the back section to a value sufficient for using the lens in modern movie cameras with a mirror-reflex shutter.

1 dwg, 1 app