| 摘要 |
PURPOSE:To supply a stable high frequency current to a magnetic head and to easily obtain a digital change by providing a tank circuit between the alternating current bias oscillation circuit of a magnetic recording processing circuit and a recording signal impressing part to a coil formed at a magnetic head and a superconductive quantum element coupled with the tank circuit. CONSTITUTION:A high frequency current used at the time of erasing the information or at the time of sound-recording the information recorded to a magnetic tape 4 is generated from an alternating current bias transmitting circuit 1 of a magnetic recording processing circuit. Between the circuit 1 and coils 7 and 8 provided on respective recording head 4 and an erasing head 5, an impedance matching circuit 12 and a superconductive quantum interfering circuit 11 are arranged. At respective interfering circuits 11, a tank circuit composed of a coil 13 and a capacitor 14 and a superconductive quantum interfering piece RFSQUID 15 coupled inductively to the tank circuit are provided, and when the alternating current bias current from the circuit 1 is changed, the alternating current voltage of the tank circuit is made constant and the current to flow at the coils 7 and 8 is stabilized. |
