发明授权
- 专利标题: Optical relay lens system for projection displays
- 专利标题(中): 用于投影显示的光学中继透镜系统
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申请号: US373696申请日: 1995-01-17
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公开(公告)号: US5597222A公开(公告)日: 1997-01-28
- 发明人: Fuad E. Doany , Rama N. Singh
- 申请人: Fuad E. Doany , Rama N. Singh
- 申请人地址: NY Armonk
- 专利权人: IBM Corporation
- 当前专利权人: IBM Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: G02B13/00
- IPC分类号: G02B13/00 ; G03B21/14
摘要:
A projection display which includes reflective light valves such as liquid crystal spatial light modulators, and a 1.times. optical relay lens system. The 1.times. optical relay lens system eliminates the requirement for a projection lens having a large retrofocus distance. Projection displays based upon reflective liquid crystal light valves (spatial light modulators) require dichroic beam splitters necessary for color separation and a polarizing beam splitter necessary for light valve operation positioned between the light valves and the projection lens. The 1.times. optical relay lens produces a relayed intermediate image of the light valves, and incorporates therein the dichroic beam splitters and the polarizing beam splitter. The 1.times. optical relay lens produces an intermediate image which is projected by the projection lens at a given magnification with minimal working distance, which results in relatively less residual lateral color and an inexpensive projection lens.
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