| 摘要 |
A method for setting the spherical aberration correction of a scanning beam in a device for scanning an information layer of an optical record carrier. The method comprises the following steps: converging the scanning beam (16) to a focus (17) in the optical record carrier; correcting spherical aberration of the scanning beam; determining a focus error signal (23) during a longitudinal scan of the focus; and determining an optimum setting of the spherical aberration correction that maximizes the peak-peak amplitude (46) of the focus error signal
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