发明名称 |
Projection optical system and image projection apparatus |
摘要 |
A projection optical system and an image projection apparatus that are small in size and can achieve projection with a wide angle while a good image forming performance is assured includes a first lens group having a negative refracting power and a second lens group also having a negative refracting power. The first and second lens groups are arranged in order from the projection side. The first lens group includes a negative meniscus lens that has a concave surface directed to the projection side and formed as an aspherical reflecting surface. |
申请公布号 |
US7116498(B2) |
申请公布日期 |
2006.10.03 |
申请号 |
US20050073973 |
申请日期 |
2005.03.07 |
申请人 |
SONY CORPORATION |
发明人 |
NISHIKAWA JUN;NISHIKI NOBUHIKO;KURATOMI YASUNORI;KITA TETSUYA;IWAKI TAKAAKI |
分类号 |
G02B13/04;G02B9/34;G02B13/18;G02B15/14;G03B21/00 |
主分类号 |
G02B13/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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