WIDE-ANGLE FAST CATADIOPTIC LENS Russian patent published in 1994 - IPC

FIELD: optical instrument engineering. SUBSTANCE: lens has catadioptic unit, negative meniscus and concentric component. Catadioptic unit is made in form of two identical flat-convex lenses with mirror covering of spherical surfaces, mounted at an angle of 90 deg in such a manner, that plane of connection of these surfaces, covered with semitransparent mirror covering, is tilted at an angle of 45 deg to crossing optical axes of the lenses, and point of crossing belongs to the plane of connection of lenses. Flat-concave lens is mounted onto axis, from the side of image, tightly to the surface of lens unit. Sphere of the lens coincides with focal spherical surface of the lens, adjoining the lens. Afocal compensator of magnification chromatism is disposed from the side of the objects tightly to flat-concave lens. EFFECT: improved efficiency. 2 dwg