Patent ID: 6745946
Filing Date: 2004-06-08
Classification: G11B

Abstract:
A device for scanning a disc-shaped information carrier which is provided, near a circumference, with a support element manufactured from a magnetizable material, which device is provided with an electromagnetic system for co-operating with the support element and with a scanning unit for scanning information present on the information carrier, said information carrier, by co-operation between the electromagnetic system and the support element, being positioned with respect to the scanning unit, rotating about an axis of rotation directed perpendicularly to the information carrier and displaced along an X-axis directed perpendicularly to the axis of rotation, wherein the electromagnetic system is provided with no more than a single pair of rows of electromagnets arranged along the X-axis, said rows of electromagnets, viewed in a direction parallel to the axis of rotation, being arranged on either side of the information carrier, and with a first pair of electromagnets and a second pair of electromagnets which, viewed in a middle position of the information carrier along the X-axis and viewed in a direction parallel to a Y-axis extending perpendicularly to the axis of rotation and the X-axis, are arranged substantially diametrically opposite each other, the electromagnets of each pair, viewed in a direction parallel to the axis of rotation, being arranged on either side of the information carrier, and the magnetic poles of the electromagnets being at substantially the same distance from the X-axis and, in each position of the information carrier along the X-axis, on one side of a magnetic point of application of the support element.