| 摘要 |
<p>A device for electromagnetically scanning information tracks on a record carrier (1), such as an optical tape, via a scanning beam is described. On this tape, information tracks (47) are arranged substantially parallel and substantially transverse to a transport direction of the record carrier. The device is provided with a scanning unit (10, 20, 30) for scanning, with the beam always following parallel scanning paths, and a control system for controlling an angle of the scanning paths with respect to the transport direction, dependent on a tilt signal. According to the invention, the device is provided with angle-measuring means for generating the tilt signal dependent on a tracking error signal which is indicative of a difference between a scanning path and the relevant information track. In addition to a tilt signal, a speed signal may also be derived from the tracking error signal. Both the tilt signal and the speed signal are derived from the tracking error signal in a captured and in a non-captured state of operation.</p> |
