发明授权
- 专利标题： Condenser lens, polarizing element, light source apparatus, and projection display apparatus
- 专利标题（中）： 冷凝透镜，偏光元件，光源装置和投影显示装置
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申请号： US47504申请日： 1993-04-16
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公开(公告)号： US5384659A公开(公告)日： 1995-01-24
- 发明人: Shinsuke Shikama , Hiroshi Kida , Akira Daijogo
- 申请人： Shinsuke Shikama , Hiroshi Kida , Akira Daijogo
- 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： JPX4-099653 19920420; JPX4-113475 19920506; JPX4-287671 19921026; JPX4-313261 19921124
- 主分类号： G02B3/04
- IPC分类号： G02B3/04 ; G02B5/30 ; G02B13/18 ; G02B19/00 ; H04N9/31
摘要：
Disclosed is a condenser lens with large aperture, having a numerical aperture of 0.9 or larger, which consists of a bi-aspherical single lens having a first surface of convex form facing the larger conjugate side and a second surface facing the smaller conjugate side and whose outermost circular zone is formed concave, the condenser lens satisfying the following conditions (1) or (2). Also disclosed are a light source apparatus using such a condenser lens and a projection display apparatus using such a light source apparatus.(1) 0.42