TELOCENTRIC OBJECTIVE Russian patent published in 2006 - IPC G02B13/22 G02B9/64 

FIELD: optical engineering.

SUBSTANCE: telocentric objective can be used for operation with CCD arrays. Objective has 11 single lenses grouped in three groups composed of three, one and seven lenses along the ray path. Lenses 1, 5, 8 and 11 are menisci, which are turned with convexity to object. Lens is 2 has to be biconvex lens. Lenses 3, 6 and 9 have to be biconvex lenses and lenses 4, 7, 9 and 10 are menisci turned with their concavity to object. Focal distances of several groups and subgroups of lenses correspond to relations given in formula of the invention. High-quality image is achieved in common focal plane simultaneously in three spectral ranges: Δλ1=0,5-0,6; Δλ2=0,6-0,7 and Δλ3=0,79-0,9 micrometer.

EFFECT: widened spectral range.

2 cl, 1 dwg