Variable-Focal-Length Projection Lens System and P

专利名称：Variable-Focal-Length Projection Lens

System and Projection Apparatus

发明人：Katsuhiro TAKAMOTO,Kazuhiko

INOUE,Sadanobu IMAMURA,Kohei WATARU

申请号：US13483987申请日：20120530

公开号：US20120307371A1公开日：20121206

专利附图：

摘要：A variable-focal-length lens system for projection which achieves focusing bymovement of the entire system has a second to a fourth lens group as focal-length-

varying lens groups and a first lens group as a distance-compensation lens group. Thesecond to fourth lens groups individually move in the optical axis direction to vary thegroup-to-group distances so as to vary the focal length of the entire system. Duringfocusing, the first lens group moves in the optical axis direction such that, as theprojection distance varies from a remote distance to a close distance, curvature of fieldvaries to the under side.

申请人：Katsuhiro TAKAMOTO,Kazuhiko INOUE,Sadanobu IMAMURA,Kohei WATARU

地址：Sakai-shi JP,Sakai-shi JP,Sakai-shi JP,Nishinomiya-shi JP

国籍：JP,JP,JP,JP

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