Patent ID: 7441459
Filing Date: 2008-10-28
Classification: G01C

Abstract:
1. 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.