PROJECTION HIGH-APERTURE TELECENTRIC LENS Russian patent published in 2010 - IPC G02B9/64 G02B13/22 

FIELD: physics.

SUBSTANCE: objective has first and second components in form of positive menisci whose convex surfaces face each other, a third component in form of a negative meniscus whose concave surface faces the image space and made from a positive and a negative lens stuck together, a fourth component in form of a negative meniscus made from a biconcave and a biconvex lens stuck together and whose concave surface faces object space, a fifth component in form of a biconvex lens, a sixth component in form of a positive meniscus whose concave surface faces the image space, a seventh component in form of a negative meniscus whose concave surface faces the object space and is placed in front of the first component, and an aperture diaphragm placed between the third and fourth components. The sixth and seventh components have small displacements along the optical axis. Optical power values of the components satisfy relationships given in the formula of invention. The lenses are made from two types of glass.

EFFECT: provision for uniformly high quality of image within the rectangular field of the image, defined by dimensions of the CCD matrix, improved manufacturability by cutting the number of types of glass down to two and possibility of matching the image scale.

4 dwg, 2 tbl