Piezoelectric vibrator for driving device within small limited space, e.g. portable electronic device, comprises piezoelectric component including three piezoelectric component layers having electrodes, and power transmission component

摘要

A piezoelectric vibrator (1) comprises piezoelectric component including first piezoelectric component layer (110) having two top electrodes (111, 112) arranged left and right; second piezoelectric component layer (120) having internal ground electrode (121); and third piezoelectric component layer (130) having two internal electrodes (131, 132) and bottom electrode (133) formed in plane opposite to plane where internal electrodes are formed; and power transmission component formed on piezoelectric component to transmit vibration generated from piezoelectric component to outside. A piezoelectric vibrator comprises: (1) a piezoelectric component including a first piezoelectric component layer having two top electrodes arranged left and right; a second piezoelectric component layer provided under the first piezoelectric component layer, and having an internal ground electrode; and a third piezoelectric component layer provided under the second piezoelectric component layer, and having two internal electrodes formed in a mirror image with respect to the two top electrodes and arranged left and right, and a bottom electrode formed in a plane opposite to the plane where the internal electrodes are formed; (2) side electrodes including a first side electrode for electrically connecting the left top electrode of the first piezoelectric component layer to the right internal electrode of the third piezoelectric component layer; a second side electrode for electrically connecting the right top electrode of the first piezoelectric component layer to the left internal electrode of the third piezoelectric component layer; and a third side electrode for electrically connecting the internal ground electrode of the second piezoelectric component layer to the bottom electrode of the third piezoelectric component layer; and (3) a power transmission component formed on the piezoelectric component to transmit vibration generated from the piezoelectric component to the outside. Each of the top electrodes and the internal electrodes of the piezoelectric component comprises a bent pattern, which is bent at a right angle, such that one end of a side where the respective electrodes are adjacent to one another extends up to an outside of the piezoelectric component in opposite directions from the center portion of the piezoelectric component, and other ends that are not adjacent to one another extend up to a side of the piezoelectric component.