Tuning-fork type transducer for angular-speed sensor, angular-speed sensor using the same transducer, and automotive vehicle using the same angular-speed sensor

A tuning-fork type transducer for an angular-speed sensor comprising:

• a tuning fork having two arms and a base portion for connecting the two arms and being formed of non-piezoelectric material;
• first piezoelectric films provided with upper electrodes and lower electrodes formed on a main surface of at least one arm out of the two arms which excite the tuning fork in the X-axis direction thereof so as to be apart from each other with a center line thereof as a boundary;
• and
• second piezoelectric films having upper electrodes and lower electrodes formed on a main surface of at least one of the two arms so as to be apart from each other with the center line thereof as a boundary for monitoring amplitude of the arm a X-axis direction when driving signals having the phases reversed from each other are supplied to the upper electrodes and hence the turning-fork performs fork-oscillation in the X-axis direction with the center line thereof as a boundary, the upper electrodes outputting monitor signals having the phases reversed from each other.