THREE-ELEMENT LENS WITH REMOTE ENTRANCE PUPIL Russian patent published in 2006 - IPC G02B9/06 G02B11/02 

FIELD: optical systems.

SUBSTANCE: the three-element lens has two components, component in the motion of beams - the single first biconvex lens, the second component - two-element glued of the second biconvex lens and the negative lens made in the form of a meniscus directed by the convexity to the image. The first and second biconvex lenses are made of an optical material of the same brand. The relations between the radii of the optical surfaces and the indices of refraction of the materials of the lenses indicated in the claim are realized.

EFFECT: improved quality of the image and enhanced adaptability to manufacture of the lens.

1 dwg