INFRARED LENS WITH TEMPERATURE COMPENSATION OF FOCUSING Russian patent published in 2019 - IPC G02B7/02 G02B9/12 

FIELD: optics.

SUBSTANCE: lens can be used in optoelectronic devices operating in far infrared region at large temperature changes. Lens comprises three lenses and an aperture diaphragm located between first and second lenses, and a photoelectric receptor with a built-in temperature sensor, mounted in the holder and movable along an optical axis relative to the lens body, thermal compensation assembly comprises a compensation ring connected to the lens housing, a photoelectric receptor frame and a travel drive, a photoelectric receptor "dead stroke" compensator, a compensation ring turn sensor and a microprocessor device. Outputs of temperature sensors built into lens and photoelectric receptor, as well as the output of the sensor of the turning angle of the compensation ring are connected to the input of the microprocessor device, the output of which is connected to the input of the movement drive. Relationships given in the claim are satisfied.

EFFECT: technical result is high image quality and high accuracy of aligning the plane of the best installation and plane of the photoelectric receptor in a wide range of ambient temperatures with super high magnification and small pixel dimensions.

1 cl, 1 dwg, 2 tbl