发明申请
- 专利标题: Projection Apparatus
- 专利标题(中): 投影仪
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申请号: US11914020申请日: 2006-04-21
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公开(公告)号: US20080192153A1公开(公告)日: 2008-08-14
- 发明人: Gerhard Kuhn , Moritz Engl , Patrick Kromotis , Stefan Grotsch , Josef Huttner , Mario Wanninger , Georg Bogner
- 申请人: Gerhard Kuhn , Moritz Engl , Patrick Kromotis , Stefan Grotsch , Josef Huttner , Mario Wanninger , Georg Bogner
- 申请人地址: DE Regensburg
- 专利权人: OSRAM OPTO SEMICONDUCTORS GMBH
- 当前专利权人: OSRAM OPTO SEMICONDUCTORS GMBH
- 当前专利权人地址: DE Regensburg
- 优先权: DE102005022357.5 20050513; DE102005031336.1 20050705
- 国际申请: PCT/DE06/00698 WO 20060421
- 主分类号: H04N5/74
- IPC分类号: H04N5/74
摘要:
A projection apparatus is specified, comprising a light modulator having a light receiving region with a cross-sectional area to be illuminated of the size AM and a maximum acceptance angle a for incident light, and at least one light source by means of which, during its operation, a light cone is produced for illuminating said cross-sectional area of said light receiving region and which comprises a number N of LED chips having a maximum radiation angle β. At least one of the LED chips has a radiation decoupling area of the size AD. The relation 0.7·(AM·sin2(α))/(AD·sin2(β)·n2)≦N≦1.3·(AM·sin2(α))/(AD·sin2(β)·n2) applies, where n is equal to 1 or to the refractive index of a coupling medium with which the LED chips are provided.
公开/授权文献
- US08189123B2 Projection apparatus 公开/授权日:2012-05-29