CONCENTRIC OBJECTIVE LENS Russian patent published in 1994 - IPC

FIELD: objective lenses applicable in optical observation systems and photorecorders. SUBSTANCE: concentric objective has biconvex lens and one or two adjacent concentric meniscuses with-out clearance from different sides. Radii of surfaces of biconvex lens and radii of external surfaces of meniscuses are made not equal to each other in absolute value, and radius of external surface of last meniscus is equal to distance from common center of concentric surfaces to focus. EFFECT: higher efficiency. 4 dwg