A piezoelectric transducer formed of a body of piezoelectric material
having first and second opposed sides and first and second electrically
conductive layers on the first and second sides respectively of the
piezoelectric body, wherein the piezoelectric body and the electrically
conductive layers are so constructed that they form a plurality of
separate adjacent series-connected transducer elements. A method of
manufacturing such a transducer is also disclosed. The piezoelectric body
may have a substantially uniform direction of polarization, or
alternating zones of opposite polarization. The conductive layers may be
continuous or discontinuous, together forming isolated electrode pairs to
define the individual transducer elements. The elements can be hard wired
or connected through a switching circuit to display either
circumferential or axial or other ultrasonic focal patterns, and may be
connected in a parallel, rather than a series configuration. When
connected in series, advantageously higher impedance can be obtained,
compared to the parallel configuration.