Objective lens with large aperture ratio
专利汇可以提供Objective lens with large aperture ratio专利检索，专利查询，专利分析的服务。并且PURPOSE: To obtain a macro lens whose aberration is efficiently compensated for objects located at places from infinitely long distance to extremely close distance in a lens system consisting of 3 positive lens groups by moving each group forward at a different distance of movement.
CONSTITUTION: A titled objective lens consists of 3 lens groups, the 1st lens group with positive refractive indexes, the 2nd lens group with positive refractive indexes and the 3rd positive refractive with positive refractive indexes and focuses objects located at places from infinitely long distance to extremely close distance. At the time, the 2nd lens group II is extended more than the extension of the 3rd lens group III and the 1st lens groupIis extended more than the extension of the 2nd lens group II.
COPYRIGHT: (C)1982,JPO&Japio，下面是Objective lens with large aperture ratio专利的具体信息内容。
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