| 摘要 |
PURPOSE: To reduce regenerative waveform distortion and to eliminate a data error by making the number of turns of a coil of an inductive magnetic head a prescribed value and satisfying a specific relation between the input resistance and the input capacity of an amplifier circuit. CONSTITUTION: In the amplifier circuit of a MIG type magnetic head, for inducing no data error, it is necessary that the maximum waveform distortion factor is made 15% or below, and for satisfying the request, the matter that the inductance component Lh of the magnetic head among respective circuit constants is reduced is most effective. The reduction of the inductance component Lh is dealt with by reducing the number of turns of the coil 4. However, the number of turns of the coil 4 is limited to about 30 turns since a reproducing output is lowered. Further, when the input resistance of the amplifier circuit is defined Rin (Ω), and the input capacity is defined Cin (pF), the combination between the inductive magnetic head and the amplifier circuit satisfied with the relation of Rin<14300×Cin<-1.5> is required to be used.
|
