| 摘要 |
PURPOSE:To position a magnetic head correctly, by simultaneously reproducing a pair of recording tracks with a magnetic head to be adjusted and utilizing a fact that the frequency signals reproduced from the pair of tracks offset each other when the magnetic head is at a specified vertical position. CONSTITUTION:A magnetic tape 14 is made run at a fixed speed by means of a running mechanism which is not shown in the diagram and a reference tape for adjusting the vertical position of a magnetic head is implemented, by simultaneously recording a normal-phase frequency signal S1 and reverse-phase frequency signal S2 from a signal generator 16 on the magnetic tape 14 in parallel. When the vertical position of a magnetic head 18 is adjusted, the implemented reference tape 17 is made run in the direction of the arrow at a fixed speed and its reference tracks 31 and 32 are respectively reproduced by the recording- reproducing heads 19 and 20 of the magnetic head 18. The reproduced signals are inputted into a 2-phenomena oscilloscope 28 through regenerative amplifiers 26 and 27 and observed. When the magnetic head 18 is adjusted to a specified vertical position, the amplitudes of the reproduced outputs of the signals S1 and S2 become equal to each other and offset each other. |
