| 摘要 |
PURPOSE:To correspond to the large diameter channel processing while increasing the connectable number for the same tap with the delay line of the reception signal from current-converted multiple vibrators in an ultrasonic diagnostic device displaying the sectional image of a testee by means of a focusing control of ultrasonic beam using a linear array with multiple ultrasonic vibrators. CONSTITUTION:A voltage/current conversion means 5 is provided with voltage/ current converters VI1 to VIn converting input voltage signals VSIG into current signals ISIG at its output with the constant bias current IDC supplied and constant current sources IG1 to IGn supplying the bias current IDC to the VI1 to VIn so as to prevent the bias current IDC from being outputted at a tap changeover means 6. |
