INFRARED OBJECTIVE LENS WITH TWO FIELDS OF VISION AND REMOTE APERTURE DIAPHRAGM Russian patent published in 2014 - IPC G02B13/14 G02B15/16 G02B9/64 

FIELD: physics.

SUBSTANCE: first component is fixed and is in form of a positive meniscus whose convex surface faces the object space, the second movable component is in form of a biconcave lens, the third component is fixed and the first two menisci therein are positive and face each other with their convex surfaces, and third component is a plane-concave lens, whose flat surface faces the image plane, the fourth fixed positive component includes three menisci whose concave surfaces face the image plane, the first and third menisci of which are positive and the second meniscus is negative. The second surface of the lens of the first component, the first surface of the lens of the second component and the concave surface of the first positive meniscus of the fourth component are aspherical.

EFFECT: high transmission factor of the optical system and manufacturability while maintaining a high aperture ratio, differential magnification and image quality.

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