发明授权
- 专利标题： Projection lens and projection device using the same
- 专利标题（中）： 投影镜头和投影装置使用相同
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申请号： US12314397申请日： 2008-12-10
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公开(公告)号： US08023196B2公开(公告)日： 2011-09-20
- 发明人: Ming-Kuen Lin
- 申请人： Ming-Kuen Lin
- 申请人地址： TW Taoyuan County
- 专利权人： Qisda Corporation
- 当前专利权人： Qisda Corporation
- 当前专利权人地址： TW Taoyuan County
- 优先权： TW96148035A 20071214
- 主分类号： G02B9/04
- IPC分类号： G02B9/04 ; G02B9/34 ; G02B13/04
摘要：
A projection lens and a projection device using the same are provided. The projection device includes a projection lens and an optical element. The projection lens includes a first lens group and a second lens group from an image side sequentially. The first lens group has a negative refracting power, and the first lens group includes an aspherical lens surface. The second lens group has a positive refracting power. The first lens group has a first focal length f1, and the second lens group has a second focal length f2. The first focal length f1 and the second focal length f2 satisfy the following two conditions: 0.5
公开/授权文献
- US20090153978A1 Projection lens and projection device using the same 公开/授权日：2009-06-18
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