发明申请
- 专利标题: Apparatus for reading from an optical recording medium
- 专利标题(中): 用于从光学记录介质读取的装置
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申请号: US12455970申请日: 2009-06-10
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公开(公告)号: US20090323505A1公开(公告)日: 2009-12-31
- 发明人: Marco Winter , Dirk Gandolph , Andrej Schewzow
- 申请人: Marco Winter , Dirk Gandolph , Andrej Schewzow
- 专利权人: Thomson Licensing
- 当前专利权人: Thomson Licensing
- 优先权: EP08159346.9 20080630
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
An apparatus for reading from an optical recording medium, and more specifically to an apparatus suitable for reading from an optical recording medium having a high data density is proposed.The apparatus has: a light source for generating a first light beam; means for generating a second light beam, which has a different wavelength than the first light beam; one or more focusing means for focusing the first light beam and the second light beam onto the optical recording medium to form a first light spot and a second light spot, wherein the second light spot is larger than the first light spot and physically and/or virtually encompasses the first light spot; one or more detectors for detecting a first light beam and a second light beam reflected by the optical recording medium; and means for generating a data signal from the difference between the detected first and second reflected light beams.
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