MIRROR-LENS OBJECTIVE Russian patent published in 1998 - IPC

FIELD: optical engineering. SUBSTANCE: objective has mirror components one of which is made as concave mirror and the other, as convex mirror mounted for removal from travel of rays for discrete variation of objective optical parameters. Third component is made as lens compensator. Objective is provided with auxiliary lens component the optical axis of which is parallel to optical axis of objective or coincides with it. Optical force ϕ_a of auxiliary lens component is related to optical force ϕ_l of lens compensator as ϕ_a = (1-S′ϕ_l)/d+S′(1-dϕ_l) ,, where d is distance between main planes of auxiliary lens component and lens compensator; S′ is distance from lens compensator to focal plane of objective. EFFECT: more effective variation of parameters. 3 cl, 3 dwg, 2 tbl