OBJECTIVE LENS WITH REMOTE ENTRANCE PUPIL Russian patent published in 2001 - IPC

FIELD: optical devices. SUBSTANCE: the objective lens has the first component made in the form of a plane-parallel plate, which serves as an afocal correcting element, the second and third - in the form of plano-convex lenses turned with the plane side towards the entrance pupil, the fourth - in the form of a negative meniscus, and the fifth component made in the form of a planeparallel plate, which serves as a field correcting element. Both correcting elements are made in the form of two glass plates with different refractive indices and a spherical boundary of their connection. EFFECT: enhanced angular field of view of the objective lens at a high relative aperture, as well as reduced thickness of the objective lens in the axis, and improved correction of the spherical, chromatic and field aberrations. 3 dwg