| 摘要 |
<p>Herein disclosed is a sound converting apparatus for performing conversion between electric signals and ultrasonic waves, comprising: a plurality of oscillation bodies E1, E2 for emitting ultrasonic waves converted from the electric signals along a wave propagating direction Dp; and a plurality of electrically conductive bodies 6,7 each for electrically connecting the oscillation bodies E1, E2; a plurality of signal lines 9, 10 for inputting electric signals to be applied to respective oscillation bodies E1, E2; a pair of external electrodes 3, 5 respectively held in contact with the outer surfaces 106, 206 of respective piezoelectric layers 1, 2 and electrically connected with the electrically conductive bodies 6, 7; and a dividing electrode 4 sandwiched by and held in contact with the inner surfaces 105, 205 of the piezoelectric layers 1, 2 and electrically connected with the signal line 9, whereby the piezoelectric layers 1, 2 respectively generate electric polarizations, directions of which are opposing to each other and extending substantially parallel to an azimuthal direction Da perpendicular to the wave propagating direction Dp, and emit ultrasonic waves converted from the electric signals along the wave propagating direction Dp when electrical fields are applied between the external electrodes 3, 5 and the dividing electrode 4 in response to the electric signals, the ratio of the width W1 to the thickness T is within a range of from 0.1 to 0.8.</p> |
