发明公开
EP1909267A1 Compact apparatus for reading from and/or writing to holographic storage media
审中-公开
Kompakte Vorrichtung zum Lesen von und / oder Schreiben auf holografischen Speichermedien
- 专利标题： Compact apparatus for reading from and/or writing to holographic storage media
- 专利标题（中）： Kompakte Vorrichtung zum Lesen von und / oder Schreiben auf holografischen Speichermedien
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申请号： EP06121731.1申请日： 2006-10-04
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公开(公告)号： EP1909267A1公开(公告)日： 2008-04-09
- 发明人: Knittel, Joachim
- 申请人： Thomson Holding Germany GmbH & Co. OHG
- 申请人地址： Karl-Wiechert-Allee 74 30625 Hannover DE
- 专利权人： Thomson Holding Germany GmbH & Co. OHG
- 当前专利权人： Thomson Holding Germany GmbH & Co. OHG
- 当前专利权人地址： Karl-Wiechert-Allee 74 30625 Hannover DE
- 代理机构： Schmidt-Uhlig, Thomas
- 主分类号： G11B7/0065
- IPC分类号： G11B7/0065 ; G11B7/135
摘要：
The present invention relates to a compact apparatus for reading from and/or writing to holographic storage media, and to a filter (17) for use in such an apparatus.
According to the invention, a polarizing filter (17) for a light beam has:
- a substrate with an outer zone (17a) and an inner zone (17b), the outer zone (17a) and the inner zone (17b) having different optical properties for a first direction of polarization and a second direction of polarization, and
- a wave plate (17c) attached to the substrate for influencing the polarization of the light beam, wherein a part of the wave plate (17c) corresponding to either the outer zone (17a) or the inner zone (17b) is switchable.
According to the invention, a polarizing filter (17) for a light beam has:
- a substrate with an outer zone (17a) and an inner zone (17b), the outer zone (17a) and the inner zone (17b) having different optical properties for a first direction of polarization and a second direction of polarization, and
- a wave plate (17c) attached to the substrate for influencing the polarization of the light beam, wherein a part of the wave plate (17c) corresponding to either the outer zone (17a) or the inner zone (17b) is switchable.
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