| 摘要 |
The overvoltage applied on a head during switching of the head is prevented. At the time when the head switching signal changes, a switch S4 for turning on/off an operational amplifier Gm1 is turned off, and the operational amplifier Gm1 is turned off. Simultaneously, the switch S3 is turned on, the current source I1 is connected to a capacitor C1, and the capacitor C1 is discharged. Then, switches S1 and S2 for switching the MR head are switched. Finally, the switch S3 is turned off and the switch S4 is turned on, thus the switching of the MR head is finished.
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