| 摘要 |
PURPOSE:To attain high speed inversion of a recording current by utilizing a high through-rate at the leading of a recording current due to an excess current or a high through-rate of leading of recording current due to insufficient damping in addition to the former high through-rate. CONSTITUTION:A current i0=i1+i2 flowing to a head system is changed result ingly by using a control pulse so as to switch plural differential current switches 14, 17, 22, 25. Actually, in recording data, the current i0 is set to be an optimum recording current depending on the head receiving the current and the character istic of the medium. The high through-rate of the leading of current due to excess current of insufficient damping is utilized in this way, then the vibrating current component or excess current component caused at that time is canceled completely by selecting an equalizing parameter properly, and the proper rectan gular recording current waveform is obtained while the high through-rate at leading is being kept. Thus, the high recording current inverting speed is attained.
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