发明申请
- 专利标题： Optical Head With Switchable Diameter of the Radiation Spot on the Radiation Detector
- 专利标题（中）： 光头可辐射探测器上的辐射点可切换直径
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申请号： US11718921申请日： 2005-11-11
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公开(公告)号： US20080205241A1公开(公告)日： 2008-08-28
- 发明人: Andrei Mijiritskii , Sjoerd Stallinga , Bernardus Hendrikus Wilhelmus Hendriks , Stein Kuiper , Albert Hendrik Jan Immink , Teunis Willem Tukker , Coen Theodorus Hubertus Fransiscus Liedenbaum
- 申请人： Andrei Mijiritskii , Sjoerd Stallinga , Bernardus Hendrikus Wilhelmus Hendriks , Stein Kuiper , Albert Hendrik Jan Immink , Teunis Willem Tukker , Coen Theodorus Hubertus Fransiscus Liedenbaum
- 申请人地址： NL EINDHOVEN
- 专利权人： KONINKLIJKE PHILIPS ELECTRONICS, N.V.
- 当前专利权人： KONINKLIJKE PHILIPS ELECTRONICS, N.V.
- 当前专利权人地址： NL EINDHOVEN
- 优先权： EP04105799.3 20041116
- 国际申请： PCT/IB05/53718 WO 20051111
- 主分类号： G11B7/135
- IPC分类号： G11B7/135 ; G02B15/00
摘要：
In an optical scanning device (10) capable of scanning an information plane of an optical record carrier (5) of different types such as BD, DVD and CD, the diameter of the radiation spot on the detector (7) is dependent on the numerical aperture of the objective system (4) that is used for scanning the record carrier An optimal design of the optical detection system for scanning a BD, result in a small radiation spot for the other types such as DVD and CD. By implementing an optical element (13) that increases the diameter of the radiation spot in the situation a DVD or CD is scanned, the influence of stray light is reduced and the tracking signals are improved