发明授权
US07391578B2 Projection zoom lens system and projector apparatus using the same
有权
投影变焦镜头系统和使用其的投影仪设备
- 专利标题： Projection zoom lens system and projector apparatus using the same
- 专利标题（中）： 投影变焦镜头系统和使用其的投影仪设备
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申请号： US11319623申请日： 2005-12-29
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公开(公告)号： US07391578B2公开(公告)日： 2008-06-24
- 发明人: Yasuharu Yamada
- 申请人： Yasuharu Yamada
- 申请人地址： JP Tokyo
- 专利权人： Olympus Imaging Corp.
- 当前专利权人： Olympus Imaging Corp.
- 当前专利权人地址： JP Tokyo
- 代理机构： Kenyon & Kenyon LLP
- 优先权： JP2005-000056 20050104
- 主分类号： G02B15/14
- IPC分类号： G02B15/14
摘要：
A projection zoom lens includes, in order from an enlargement side, a first lens unit G1 of negative refracting power, a second lens unit G2 of positive refracting power and a third lens unit G3 of positive refracting power. Focusing is implemented by movement of the first lens unit G1 alone. The first lens unit satisfies condition (1) with respect to its movement. 0.003
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