| 摘要 |
A radial tilt detector which is capable of detecting a tilt in a radial direction of an optical disc at a high degree of precision and being cost-effective and simple in head part construction. The radial tilt detector is provided in an optical disc information recording/reproduction apparatus which includes an optical head for projecting a condensed beam of light on a recording surface of a rotating optical disc and receiving the projected beam of light reflected from the recording surface of the optical disc, a focus actuator for focusing the condensed beam of light on its projected position of the recording surface of the optical disc, and a driver for outputting a drive signal to drive the focus actuator. The detector comprises an acceleration detector for outputting a signal indicative of an acceleration in a direction depending on an optical axis of the light beam at the position focused by the focus actuator, and a radial tilt calculation processor for receiving the acceleration signal and a signal indicative of a distance between the center of the optical disc and the projected position of the light beam on the recording surface of the optical disc and calculating the radial tilt using the received signals and a rotation velocity of the optical disc or a linear velocity at which the light beam scans the recording surface of the optical disc.
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