PIEZOELECTRIC VIBRATOR UNIT

摘要

An insulating substrate (1) comprises a first insulating substrate (1a) and a second insulating substrate (1b) stacked on the first insulating substrate (1a). On both substrates (1a, 1b) formed are wiring patterns and electrodes. A recess is defined by the opening (4) made in the first insulating substrate (1a) and by the upper face of the second insulating substrate (1b). Wirings (15 and 18) are arranged on the upper face of the second substrate (1b) in the area corresponding to the bottom of the recess. Consequently, the space where the wirings are provided is wide and the distance between the conductors (15 and 18) is long. In addition, the wirings are away from the external electrodes provided on the lower face of the second substrate (1b). Therefore, the parasitic capacitances between the electrodes and wirings and between the wirings are reduced.