| 摘要 |
A device is arranged for scanning an optical record carrier (11), which has a data layer with parallel data tracks. The device has an optical head (22) comprising a detector for receiving radiation reflected from a data track, the detector having sub-detectors arranged in a quadrant. The device has a tilt unit (32) for generating a tilt signal representing a tilt angle (204) between an optical axis (202) of the optical head and a perpendicular (203) of the data layer. The tilt unit (32) generates a diagonal push-pull signal based on a difference of a first signal of a first diagonally positioned pair of sub detectors and second signal of a second diagonally positioned pair of sub detectors, and processes the diagonal push-pull signal for generating the tilt signal.
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