INFORMATION STORAGE UNIT WITH ELECTROMAGNETIC LIFTING DEVICE

摘要

An information storage unit comprises a frame (1), a magnetic information disc (9, 10), particularly a magnetic hard disc, which is rotatable about an axis of rotation (910), a magnetic head (52-55) arranged on a pivotable support (56-59), and a lifting device for lifting the magnetic head from the information disc. The lifting device comprises an electromagnetic actuator (62-65) having a first actuator part which is stationary relative to the frame and a second actuator part arranged on a movable portion (56b-59b) of the support. When the actuator is energized these actuator parts cooperate with one another via an air gap to generate a lifting force. Such an energization is effected particularly when a scanning operation is started and stopped, in order to preclude damaging of the information disc. Energization requires a comparatively small amount of energy and the measure has a favourable effect on the required starting torque.