Original document(49 pages)  中文版
    The provided variable-focus lens system comprises: from the object to image, a first lens group with negative focal power, which includes a falcate first lens with concave toward the imaging plane and a second lens with positive optical power; and a second lends group with positive optical power, which includes an optical column, a biconvex third lens with positive optical power, and a negative-optical-power fourth lens with concave toward the object.
Application Number
申请号		 200510037127 Application Date
申请日		 2005.09.07
Title 名称 Zoom lens system
Publication Number
公开号		 1928611 Publication Date
公开日		 2007.03.14
Approval Pub. Date Granted Pub. Date
International Classification 分类号 G02B15/14;G02B9/10;G02B13/18;G02B5/20
Applicant(s) Name
申请人		 Tsinghua University
Address 地址
Inventor(s) Name 发明人
Attorney & Agent 代理人
More information 更  多  信  息


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