INFRARED RAPID THREE-LENS OBJECTIVE Russian patent published in 2009 - IPC G02B13/14 

FIELD: physics, optics.

SUBSTANCE: invention concerns objectives of non-scanning thermal imaging devices with non-cooled matrix receivers. The objective contains the first plus, second subzero and the third plus meniscuses. The first and third meniscuses are converted by an incurvation to a plane of images, second - to space of subjects. All refracting surfaces are executed by the spherical. The length from the first refracting surface to the plane of images does not exceed 1.8 focal distances of an objective. An exponent of a refractive of a material of the first and third meniscuses for the basic wave length of a working spectroscopic range not less than 4.0, and the second meniscus - no more than 2.5. The inventions of the relation specified in the formula between optical forces of meniscuses and an objective as a whole, curvature radiuses, thickness of the second meniscus, and distance between the first and second meniscuses are carried out.

EFFECT: improvement of quality of the image within all angular field at angular aperture maintenance, pinch of concentration of energy in a stain corresponding to the sizes of pixels of matrix thermal imaging receivers for long-range infrared spectrum field.

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