Remanent deflection cancelling device for piezoceramic head support - has max. magnitude of oscillating signal less than largest magnitude of tracking control signal

摘要

The system for cancelling remanent deflection in a piezo-ceramic head support is used in a video recorder that is operative in selected operating modes. In one of such modes, such as the reproducing mode, a tracking control signal is supplied to the piezoceramic support, thus causing the piezoceramic support means to deflect and to correspondingly displace the head supported in a direction transversely of the trace which is scanned by that head. When the video signal recorder is changed over between selected operating modes, an oscillating signal is supplied to the piezoceramic support for a predetermined duration, the maximum magnitude of the oscillating signal being less than Ec, where Ec is the largest magnitude of the tracking control signal to which the piezoceramic device responds. The magnitude of the oscillating signal is gradually reduced to a minimum level during this predetermined duration.