WIDE FIELD ATHERMALIZED ORTHOSCOPIC LENS SYSTEM

摘要

A wide field optically athermalized orthoscopic lens system includes, in order from object to image, a first lens having a negative power, a second lens having a positive power, a third lens group having a positive power, a fourth lens having a positive power and a fifth lens having a negative power. The third lens group includes two lenses having, in order, a first lens with positive power and a second lens with negative power. The powers, shapes, Abbe dispersion values and temperature coefficients of refractive indices of the lenses are selected such that the lens system is athermalized, orthoscopic and achromatized over a wide (e.g. >140° C.) temperature range.

主权项

1. A wide field athermalized orthoscopic lens system, in order from the object plane to the image plane, comprising:
a first optical group having a negative optical power, including exactly one optical element; a second optical group having a positive optical power and including exactly one optical element; a third optical group having a positive optical power and including exactly one cemented doublet; an aperture located between third and fourth components; a fourth optical group having a positive optical power; and including exactly one optical element; and a fifth optical group having a negative optical power and including exactly one optical element, wherein the lens system having a full field of view 66.5°, wherein the lens system being functionally insensitive over the range of at least −60° C. to 80° C., wherein the lens system being apochromatic over a spectral range of at least 950 nm to 550 nm, and wherein the lens system wherein distortion does not exceed 0.021% over the field of view 66.5°.