| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce the possibility for the generation of the malfunction of a switching element when the voltage of a power source apparatus has been raised without changing the constitution of the power source apparatus or the constitution of a transmission driving pulse circuit. <P>SOLUTION: When a target voltage of the driving pulse of the vibrator of an ultrasonic probe is designated from a control software, a difference setting section 22 acquires the difference between the target voltage and an output voltage value which is indicated for the power source unit at the present time, and sets a step number for which the difference is divided by a changing step width on a step number counting section 24. A voltage indicating section 28 changes the voltage indicating value which is indicated for the power source unit 12 for each cycle of a clock signal emitted from a clock section 26 by the changing step width from the present output voltage value. By properly setting the changing step width and the clock cycle, the voltage rising rate can be suppressed to a degree by which the malfunction of the switching element in a voltage increase does not occur. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
