| 摘要 |
PURPOSE:To curtail the number of parts for constituting a probe, and also, to curtail the number of signal lines, etc., extended from the probe by controlling a scan of an ultrasonic beam by opening and closing a switch group connected to an electrode of vibrator elements arranged like the face in the two-dimensional direction. CONSTITUTION:Many vibrator elements 47, 47,... of a probe 35 are brought to circuit constitution. That is, many vibrator elements 47 are arranged, for instance, like a matrix of vertical and horizontal (m)X(n) pieces, each of the vibrator elements 47 corresponding to an arrangement of lines in the horizontal direction is connected in common to each control line 52 through a sufficiently large resistance R, and each of the vibrator elements corresponding to an arrangement of rows in the vertical direction is connected in common to each control line 53. As for the control lines 52, for instance, (n) pieces are provided, and by applying a bias voltage to the control lines 52, an electro-mechanical coupling coefficient Kt of the vibrator elements 47, 47,... arranged in lines in the specific horizontal direction can be made large. By ON and OFF operations of the bias voltage applied to the control line 52, the control for allowing only the vibrator elements 47, 47,... arranged in the lines in the specific horizontal direction to be active or inactive as an electro-acoustic converting element can be executed. |
