Device for scanning information tracks on a record carrier

Details Device for scanning information tracks on a record carrier Device for scanning information tracks on a record carrier

1997-07-03

1998-10-20

Edun, Muhammad N.

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Continuous consecutive storage or retrieval of interrupted...

369 4427, 369 4432, 369 4418, G11B 700

Patent

active

058257403

ABSTRACT:
A device for electromagnetically scanning information tracks on a record carrier, such as an optical tape, via a scanning beam is described. On this tape, information tracks are arranged substantially parallel and substantially transverse to a transport direction of the record carrier. The device is provided with a scanning unit 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.

REFERENCES:
patent: 5465241 (1995-11-01), Narahara
patent: 5673245 (1997-09-01), Yanagawa et al.

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