PLANOCHROMATIC OBJECTIVE LENS OF MICROSCOPE Russian patent published in 1997 - IPC

FIELD: build-up of large-series biological, polarization, luminescent and other microscopes. SUBSTANCE: objective lens is composed of two components. First one includes k frontal lenses placed in sequence and cemented lens. Second component has single biconvex lens and meniscus facing image with concavity. Number of frontal lenses is chosen from relation with rounding-off to integral number from 0 to 3. Cemented lens of first component is made up of two biconvex lenses with biconcave lens confined between them. Optical materials of lenses of second component meet conditions 1.4<n³<1.55; 1.65<n⁴<1.95; 55< ν³<98; ; 25<ν⁴<35, where n³, n⁴ are refractive indices of lenses of second component; ν³, , ν⁴ are dispersion coefficients; is focal distance of objective. EFFECT: expanded application field. 9 dwg, 1 tbl