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专利名称：Zoom lens employing refractive and
diffractive optical elements
发明人：Chen, Chungte W.申请号：EP92310875.7申请日：19921127公开号：EP0549146A1公开日：19930630
专利附图：
摘要：A zoom lens (10) has a first lens group (12) , a second lens group (14) and athird lens group (16) . The first lens group relays an outside scene to an intermediateplane. The second lens group varies magnification of the relayed image from the first
lens group. Also, the second lens group includes at least one diffractive optical element.The third lens group compensates for focus shift and focuses the wavefront onto theviewing plane.
申请人：Hughes Aircraft Company
地址：7200 Hughes Terrace P.O. Box 45066 Los Angeles, California 90045-0066 US
国籍：US
代理机构：Colgan, Stephen James
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