SMALL-SIZED PHOTOGRAPHIC LENS
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专利名称：SMALL-SIZED PHOTOGRAPHIC LENS 发明人：MIHARA SHINICHI,IMAIZUMI MASAKI 申请号：JP8291184 申请日：1984 04 26 公开号：JPS60227213A 公开日：19851112
摘要：PURPOSE:To improve the characteristic of a minitaure camera by constituting an optical system of lenses from the 1st group to 5th group and limiting the relation among the focal lengths of the lenses, the spaces between the lenses and the range of the Abbe's number of the lenses. CONSTITUTION:The optical system is constituted of a positive meniscus lens L1 directing the convex face toward the object side, a biconcave lens L2, the lens group L3 which consists of a biconvex lens and a negative lens disposed apart at an air spacing d6 therefrom and has positive refracting power as a whole, a negative meniscus lens L4 directing the convex face toward the image side and a positive meniscus lens directing the convex face toward the image side. The conditions of the equations I -equations V areபைடு நூலகம்satisfied where the focal length of the entire system is designated as f, the combined focal length of the lenses L1-L3 as f123, the combined focal length of the lenses L4, L5 as f45, the distance between the lenses L3 and L4 as d8, and the Abbe's number of the lenses L3 and L5 as nu3, nu6. The chromatic aberration of a miniature camera is thus decreased and the image formability in the peripheral part of the field angle is improved.
申请人：OLYMPUS KOGAKU KOGYO KK
更多信息请下载全文后查看
专利名称：SMALL-SIZED PHOTOGRAPHIC LENS 发明人：MIHARA SHINICHI,IMAIZUMI MASAKI 申请号：JP8291184 申请日：1984 04 26 公开号：JPS60227213A 公开日：19851112
摘要：PURPOSE:To improve the characteristic of a minitaure camera by constituting an optical system of lenses from the 1st group to 5th group and limiting the relation among the focal lengths of the lenses, the spaces between the lenses and the range of the Abbe's number of the lenses. CONSTITUTION:The optical system is constituted of a positive meniscus lens L1 directing the convex face toward the object side, a biconcave lens L2, the lens group L3 which consists of a biconvex lens and a negative lens disposed apart at an air spacing d6 therefrom and has positive refracting power as a whole, a negative meniscus lens L4 directing the convex face toward the image side and a positive meniscus lens directing the convex face toward the image side. The conditions of the equations I -equations V areபைடு நூலகம்satisfied where the focal length of the entire system is designated as f, the combined focal length of the lenses L1-L3 as f123, the combined focal length of the lenses L4, L5 as f45, the distance between the lenses L3 and L4 as d8, and the Abbe's number of the lenses L3 and L5 as nu3, nu6. The chromatic aberration of a miniature camera is thus decreased and the image formability in the peripheral part of the field angle is improved.
申请人：OLYMPUS KOGAKU KOGYO KK
更多信息请下载全文后查看