MIRROR LENS FOR MONOCULAR GLASS Russian patent published in 1998 - IPC

FIELD: optical instruments for angular measurements, binoculars, projecting erect image. SUBSTANCE: device has four members which are located in series along beam. First member is designed as negative meniscus which concavity is directed to image, second member is designed as positive meniscus which concavity is directed to image, third member is designed as near-afocal meniscus which concavity is directed to image. Central region of its second surface serves as secondary mirror. Fourth member is designed as concave primary mirror with external reflection. EFFECT: increased functional capabilities. 2 dwg