发明授权
- 专利标题： Retrofocus projection lens system and multivision projection display apparatus
- 专利标题（中）： 复现投影镜头系统和多功能投影显示设备
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申请号： US946694申请日： 1997-10-08
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公开(公告)号： US5973848A公开(公告)日： 1999-10-26
- 发明人: Hirokazu Taguchi , Shinsuke Shikama , Daisuke Umeno
- 申请人： Hirokazu Taguchi , Shinsuke Shikama , Daisuke Umeno
- 申请人地址： JPX Tokyo
- 专利权人： Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人： Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX7-014025 19950131
- 主分类号： G02B13/04
- IPC分类号： G02B13/04 ; G02B13/18 ; G02B13/22 ; G02F1/13 ; G02B3/00
摘要：
A retrofocus projection lens system comprising, in order from a large conjugate side a first lens group having a negative refracting power and including a plurality of lenses, a second lens group having a positive refracting power, and a third lens group having a positive refracting power and including a plurality of lenses. The lens of the first lens group which is nearest to the large conjugate side is an aspherical lens, and the lens of the third lens group which is nearest to a small conjugate side is an aspherical lens. The retrofocus projection lens system desirable satisfy the following conditional expressions (1) to (3):1.8
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