发明名称 |
Auto-focusing method and projector using the same |
摘要 |
A projector for automatically adjusting images projected onto a screen includes a detecting module for detecting a propagation time for projected ultrasonic waves sent by the projector to be echoed back by the screen and received by the projector, a processing module for calculating a projection distance between the projector and the screen based on the propagation time, and outputting a focal length signal corresponding to the projection distance, an optical module, and an adjusting module for adjusting a local length of the optical module according to the focal length signal. A related method is also provided.
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申请公布号 |
US7806534(B2) |
申请公布日期 |
2010.10.05 |
申请号 |
US20070736005 |
申请日期 |
2007.04.17 |
申请人 |
HONG FU JIN PRECISION INDUSTRY (SHENZHEN) CO., LTD.;HON HAI PRECISION INDUSTRY CO., LTD. |
发明人 |
WONG SHIH-FANG;DING LIN-KUN |
分类号 |
G03B3/00 |
主分类号 |
G03B3/00 |
代理机构 |
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代理人 |
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地址 |
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