发明授权
- 专利标题： Zoom lens system
- 专利标题（中）： 变焦镜头系统
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申请号： US09020570申请日： 1998-01-27
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公开(公告)号： US06275342B1公开(公告)日： 2001-08-14
- 发明人: Keijiro Sakamoto , Kazuharu Kagoshima
- 申请人： Keijiro Sakamoto , Kazuharu Kagoshima
- 优先权： JP9-016159 19970130
- 主分类号： G02B1514
- IPC分类号： G02B1514
摘要：
A zoom lens system consists of, in order from the enlargement side to the reduction side, a first lens unit having a negative optical power and a second lens unit having a positive optical power. In the zoom lens system, either the first or the second lens unit has at least one surface having an optical power of diffraction.
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