OCULAR Russian patent published in 2000 - IPC

FIELD: optical instruments. SUBSTANCE: device has three member, first of which is positive and is glued from negative and positive lenses. Second and third members are designed as respectively positive and negative lenses. All positive lenses are made from same material, which dispersion rate is not less than 45.0. All negative are made from material, which dispersion rate is not greater than 30.0. Optical forces of glued component and single lenses conform to specified equations, which bind optical force of ocular, glued component, single positive and negative lenses. In addition, device may have light-splitting prism, which is located in front of glued component. EFFECT: design of ocular, which has given parameters and consists of four lenses, which are made from materials of three types. 2 cl, 3 dwg