FLAT APOCHROMATIC MICROSCOPE LENS

摘要

The invention relates to a flat apochromatic microscopic lens. Said type of microscopic lens comprises five lens members having a total of ten lenses. The first member with a positive total focus length, which can be seen from the lens plane, contains one lens, the radii centre of curvature thereof being arranged on the lens side. The second member is made of two lenses of a negative-positive" refractive power sequence with a positive total focus length, said lenses being cemented together and are able to be seen from the lens plane . The difference in refractive power between the first and the second member is less than 25 %. The third member is made of two lenses of a negative-positive refractive power sequence, said lenses being cemented together having a total focal length of more than 50mm. The fourth member is made of three lenses of a positive-negative-positive refractive power sequence having a positive total focal length of a maximum 35mm, said lenses being cemented together. The sum of the focal length of the central lens is less than the respective sum of the focal length of the external lens. The fifth member is made of two lenses, which are cemented together, of a positive-negative refractive power sequence having a negative total focal length of between 20mm and 8mm.