HIGH-APERTURE LENS Russian patent published in 2009 - IPC G02B9/60 

FIELD: physics; optics.

SUBSTANCE: lens can be used for forming an image on a CCD matrix. The lens includes power and correction components. The power component contains a positive double-glued lens, a negative meniscus, whose concave surface faces the object space and a lens made from a biconcave and a biconvex lens stuck together, and a single positive meniscus, whose concave surface faces the image space. The correction component contains a single positive meniscus, whose concave surface faces the image space, and a biconcave lens. The distance between the negative and positive meniscuses of the power component is not less than 0.3 of the focal distance of the lens. The single positive meniscus of the power component is made from material with Abbe number greater than 81. The sum of optical power of the power and correction components does not exceed 0.004 mm^-1.

EFFECT: higher image quality owing to increase in modulation transfer constants when the spectral range is increased to (560…1000) nm with retention of aperture ratio.

6 dwg