PLAN APOCHROMATIC OBJECTIVE LENS Russian patent published in 2014 - IPC G02B9/62 G02B13/14 

FIELD: physics.

SUBSTANCE: objective lens has two components separated by an aperture diaphragm. The first component consists of a positive meniscus whose concave side faces the image space, and a glued meniscus whose concave side faces the image space, between which there is a negative meniscus whose concave side faces the image space. The glued meniscus whose concave side faces the image space is positive and consists of a biconvex and a biconcave lens. The second component comprises a biconcave lens and two biconvex lenses. The biconcave lens and the first biconvex lens are glued. A negative meniscus whose concave side faces the object space is further placed behind the second biconvex lens.

EFFECT: larger angular and linear field of view and obtaining diffraction image quality at the centre and on the field of view.

2 cl, 1 dwg, 1 app