Patent ID: 6493292
Filing Date: 2002-12-10
Classification: G11B

Abstract:
A device for scanning an information carrier having tracks around an axis, which device has means for transferring information from/to a scanning spot on the information carrier and has tangential displacement means for moving the scanning spot in a tangential direction and radial displacement means for moving the scanning spot in a radial direction, which device has control means for controlling the radial displacement means and has radial position measurement means for generating a radial position signal (cos(9&bgr;r), sin(9&bgr;r)) which is a measure of the instantaneous radial position of the scanning spot, which device has a scanning mode, in which the scanning spot follows a track, and a displacement mode, in which the scanning spot is moved in a radial direction and tracks are crossed,characterized in that the device further has tangential position measurement means for generating a tangential position signal (S&agr;) which is indicative of the tangential position (&agr;) of the scanning spot, the control means causing the scanning spot to be moved in the radial direction in the displacement mode in a time interval with a radial displacement time (Tr) which is a function of the difference between a desired tangential position (&agr;e) and a current tangential position (&agr;b).