| 摘要 |
A radial tilt detector for an optical disc includes a first system for measuring a first average velocity vector of a light beam on a recording surface of the optical disc along a focusing direction of the light beam, a second system for measuring a second average velocity vector of the light beam on the recording surface of the optical disc along a radial direction of the optical disc, a third system for calculating a resultant vector of the measured first and second velocity vectors, and a fourth system for calculating the radial tilt angle of the optical disc using the measured first average velocity, the measured second average velocity, and the calculated resultant vector.
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