INFRARED TELESCOPE WITH TWO MAGNIFICATIONS FOR LONG-RANGE IR-AREA OF SPECTRUM Russian patent published in 2009 - IPC G02B23/00 G02B13/14 

FIELD: physics, optics.

SUBSTANCE: telescope can be used in optical systems of thermal imaging devices, including, containing the scanning devices mounted in a target pupil of a telescopic system. The telescope has the magnifications real and unchangeable at change a standing of a target pupil behind a telescope eyepiece. The plus objective of a telescope includes the plus and subzero meniscuses converted by an incurvation to a plane of a target pupil. In an eyepiece second subzero and the third convexo-convex the mobile lenses have on two fixed standings on an optical axis and small motions along an optical axis. The fourth subzero meniscus is converted by protuberance to a plane of a target pupil. Last plus component is a meniscus converted by an incurvation to a target pupil. All refracting surfaces are executed by the spherical. The eyepiece front focus at smaller magnification is the real, at larger - imaginary. Telescope parameters are related by the relations specified in the formula of the invention.

EFFECT: increase of adaptability to manufacture of optical details, decrease in labour input, improvement of requirements of fixing of the mobile objects at magnification change at maintenance of the diffraction quality of the image.

10 dwg