| 摘要 |
A radiation detector array for radial tracking error detection and focus error detection, including a first plurality of spot detectors (100, 102, 104) for conducting multiple-spot radial tracking error detection, said first plurality of spot detectors including a first spot detector (100) arranged substantially centrally thereof. The array further includes a second spot detector (106) for conducting spot-size focus error detection in combination with said first spot detector.
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