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Holographic diffraction element and optical pickup device using holographic diffraction element
Holographic diffraction element and optical pickup device using holographic diffraction element
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机译:全息衍射元件和使用该全息衍射元件的光拾取装置
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摘要
According to one embodiment, a holographic diffraction element is divided into a plurality of regions which diffract reflected light from an optical recording medium to a plurality of photodetectors. Diffracted light for detecting a focus error signal and a compensation signal for a tracking error signal is obtained from one or more common regions of the plurality of regions.
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