| 摘要 |
PURPOSE:To facilitate a wide band driving in the case of non-resonance driving and a high frequency burst driving by opening and closing alternately between a power source and a cable and between two ends of a parallel circuit of a stray capacity of the cable and an oscillator. CONSTITUTION:When a square wave driving signal A is put out from a driving circuit 12, a source voltage V0 is applied between output terminals M, N of a transmission circuit. In other words, a transmission signal B has a voltage V0 in a section K1. In a section K2 in which the output of the driving circuit 12 has a high level voltage V2, charge stored in a capacitor 4 which is a stray capacity of a cable 2 and an oscillator 3 is discharged through a switching circuit in the ON stage so that the voltage level of the transmission signal B becomes zero in the sec- tion K2. In the setion K3, the level of the transmission signal B becomes the source voltage V0. With this constitution, in the case of non-resonance driving, a square wave transmission signal B can be put out. Therefore, an ultrasonic output is not reduced much even in the high frequency region and the apparatus can be applied to a wide frequency band and a high frequency burst driving can be performed. |
