Device and method for reading and/or recording information on a disc-shaped information carrier

摘要

A device for reading and/or recording information from/in an information track on the disc-shaped information carrier (1), comprising scanning means (2) for scanning the information track with a linear velocity at a variable distance (r) from a point of rotation of the information carrier (1) and comprising drive means (3) for causing the information carrier (1) to rotate at an angular velocity. An operational area of the distance (r) is subdivided into a number of zones, while the control means (4) are arranged for setting the linear velocity at a constant velocity determined by the zone, while the linear velocity increases substantially from an innermost zone to an outermost zone. The average length with respect to the distance (r) of the outermost zones is greater than an average length of the innermost zones. The angular velocity for at least the outermost zones decreases substantially. The average information velocity at which information is processed is increased by using this measure. Furthermore, the decline of the angular velocity is kept relatively small, so that the access time is relatively small, and the maximum angular velocity is reduced. <IMAGE>