TELECENTRIC SCANNING LENS Russian patent published in 2018 - IPC G02B13/22 G02B9/04 

FIELD: optics.

SUBSTANCE: invention can be used in eyepieces, for viewing images of micro-monitors as well as in devices for optical coherence tomography. In the method, the telecentric scanning lens consists of three elements. Its first element is a single plane-convex lens, while the second and third elements are glued together and form a complex compound lens, the f2 focal length of which satisfies the condition 0.35<f2/fc, where fc is the focal length of the system as a whole, the n3 refractive index of the negative meniscus, which is part of the complex lens, satisfies the condition 2.21<n3+0.0176v3<2.27, where v3 is the Abbe index for the material of the third lens for the d spectral line (0.5875618 mcm). And the f1 focal length of the plane-convex lens satisfies the condition 1.7<f1/fc<2.2.

EFFECT: improved performance with high image quality in the near IR range, providing optical resolution close to the diffraction resolution.

4 cl, 10 dwg, 2 tbl