发明申请
US20090323505A1 Apparatus for reading from an optical recording medium 审中-公开
用于从光学记录介质读取的装置

Apparatus for reading from an optical recording medium
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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