TELESCOPIC SYSTEM FOR INFRA-BED RADIATION (VARIANTS) Russian patent published in 1997 - IPC

FIELD: electronic engineering; infra-red imaging systems. SUBSTANCE: telescopic system has catadioptric objective and eyepiece. Objective is provided in direction of ray travel with negative lens meniscus facing the object with its concavity, primary mirror with concave reflecting surface and hole in its central part, secondary convex mirror and field aberration compensator made as positive meniscus facing the image with its convex section. Second mirror is positioned in objective at smaller distance from primal mirror than second surface of negative meniscus. In this case, the following conditions are satisfied: distance from top of reflecting surface of secondary mirror to top of reflecting surface of primary mirror makes up 0.3-0.6 of objective focal distance, and optical force of aberration compensator equals 0.6-1.6 of objective optical force. Eyepiece is composed of two single lenses. Variant of telescopic system design does not include field aberration compensator, and eyepiece is of three-lens construction. In given system at least one of two mirrors may be nonspherical. EFFECT: improved design. 6 cl, 4 tbl, 2 dwg