A piezoelectric type electric acoustic converter achieves large improvement
in shatter resistance strength, increased operating efficiency and reduced
size, and includes piezoelectric ceramic layers which are laminated to
form a laminate. Main surface electrodes are disposed on the front and
back main surfaces of the laminate, and an internal electrode is disposed
between respective ceramic layers. A side electrode which connects the
main surface electrodes, and a side electrode which is conducted to the
internal electrode are formed on the side surface of the laminate. All the
ceramic layers are polarized in the same direction, and by applying an
alternating signal between the main surface electrodes and the internal
electrode, bending vibration of the laminate occurs. The front and back
surfaces of the laminate is almost entirely covered with resin-layers.
