发明名称 |
Optical scanning device with a selective optical diaphragm |
摘要 |
An optical scanning device comprising means for scanning optical record carriers of predetermined different formats, such as CDs and DVDs, using scanning at different numerical apertures provided by an optical diaphragm. The optical diaphragm comprises cholesteric liquid crystal material of one or more selected helical pitches which provide the diaphragm with desired wavelength- and/or polarization-selective characteristics.
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申请公布号 |
US6707779(B2) |
申请公布日期 |
2004.03.16 |
申请号 |
US20010897367 |
申请日期 |
2001.07.02 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
STALLINGA SJOERD |
分类号 |
G11B7/135;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/135 |
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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