| 摘要 |
PROBLEM TO BE SOLVED: To provide a bridge circuit, by which the current made to flow into a coil is changed over at a high speed while keeping the satisfied amplitude as it is, and a magneto-optical disk device using this circuit. SOLUTION: A magnetic head driving circuit 117 includes voltage supply circuits 1180, 1200 and a current supply circuit 1210. A power source voltage of 12 V is supplied to a source node 1181, a power source voltage of 7 V is supplied to a source node 1185 and a power source voltage of 5v is supplied to a source node 1201 respectively. By the voltage supply circuit 1180, the voltage of 12 V or 7 V is outputted to nodes N6, N7 in accordance with recording signals '1', '0', and by the voltage source circuit 1200, the voltage of 5 V or 0 V is outputted to nodes N8, N9. By this procedure, P-channel MOS transistors 1211, 1212 and N-channel MOS transistors 1221, 1222 are selectively made to be on/off, then the currents in the different directions are made to flow into the coil 121.
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