PLANE-CHROMATIC LOW-POWER MICROLENS Russian patent published in 2014 - IPC G02B21/02 G02B9/62 

FIELD: physics.

SUBSTANCE: microlens comprises four series-arranged components. The first component is in form of a single biconvex lens. The second component is divergent and consists of a biconcave lens and a divergent meniscus whose concave side faces the image space. The third component is divergent and consists of a biconcave lens and a converging meniscus, whose concave side faces the image space. The fourth component is in form of a single meniscus whose concave side faces the image space and a lens consisting of a biconvex lens and a meniscus whose concave side faces the object space. A biconvex lens is further placed between the first and third components.

EFFECT: high image contrast on the entire field of vision owing to plane-chromatic correction and a larger field of vision.

1 dwg, 1 tbl, 1 app