| 摘要 |
PURPOSE:To stabilize the time base correcting control by applying the signal to impress to a needle pressure impressing coil to a TBC coil driving circuit and canceling the crosstalk component in the lengthwise direction of a cantilever which occurs at the time of driving the needle pressure impressing coil. CONSTITUTION:The signal of a needle pressure control circuit 9 and the signal of a TBC control circuit 11 are added by an adder circuit 13, the electric power is amplified by a TBC coil driving circuit 12, and thereafter, a TBC driving coil 8 is driven. According to the constitution, the TBC coil 8 can be driven so as to cancel the unnecessary component which occurs in the lengthwise direction of a cantilever 1 generated at the time of driving a needle pressure impressing coil 7. By setting the unnecessary component to an adding ratio to suppress to the minimum, the change of the time base direction position of the cantilever 1 and a reproducing needle 4 will not occur even when the electric current value of the needle pressure impressing coil 7 is changed.
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