Tracking system in a rotary magnetic head type recording and/or reproducing apparatus

A tracking system for use in a rotary magnetic type recording and/or reproducing apparatus, said apparatus having two opposing rotary heads mounted on opposite sides of a rotary body either for alternately and successively recording signals in oblique tracks on a recording medium, the tracks being oblique with respect to the longitudinal direction of said recording medium or for alternately scanning over said oblique tracks on said recording medium to reproduce recorded signals, moving means for continuously moving said recording medium past said rotary heads, a magnetic head moving mechanism comprising a combination of a coil and a magnet for displacing said two rotary heads at substantially the same time with said displacement being in mutually opposite directions and by the same amount, the displacement being in a plane which is perpendicular to a plane in which said rotary heads rotate, said heads moving in response to an externally supplied driving signal, and a control head for recording a control pulse having a predetermined period onto said recording medium, said tracking system comprising:

• driving signal producing circuit means for producing a driving signal having a waveform which gradually changes in amplitude with respect to one track scanning period of said rotary heads, said changing amplitude of said waveform moving said rotary heads gradually during reproduction in which said recording medium is continuously moved by said moving means at a speed which is different from the speed used during recording, said driving signal producing circuit comprising circuit means for producing a first signal having a triangular waveform derived from a pulse obtained by detecting the rotation of said rotary body, sample-and-hold means for producing a second signal having a waveform which is a modification of the triangular waveform of said first signal, said sample-and-hold means being operated responsive to said pulse obtained by detecting the rotation of said rotary body and to a control pulse reproduced from said control head, and composition means for adding said first and second signals to obtain said driving signal;
• and
• supplying means for supplying said driving signal from said driving signal producing circuit means to said magnetic head moving mechanism.