| 摘要 |
PURPOSE:To decrease the number of the writing electric current driving circuit and to execute the decrease in cost by using one writing electric current driving circuit commonly for two reading and writing heads connected to the output terminal and executing the reading and writing. CONSTITUTION:By the signal inputted from the head selecting input signal terminal 6, a pre-writing circuit 3 of the reading and writing head system corresponding to a reading and writing head 1 to write at a head selecting circuit 4 is selected. Next, by the selected pre-writing circuit 3, the writing input signal inputted from a writing input signal terminal 5 is amplified. At both edges of a reading and writing head 1 driven by the differential output signal, the output terminal is inputted to a writing electric current driving circuit 2 connected respectively, thereby being able to drive the special reading and writing head 1 by the output of the writing electric current driving circuit 2.
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