Patent ID: 7498723
Filing Date: 2009-03-03
Classification: H03H,Y10T

Abstract:
1. A piezoelectric resonator comprising: a resonator substrate made of a quartz crystal and having a side surface in a direction of an X-axis as a crystal axis of the quartz crystal; a base substrate supporting the resonator substrate; a lid substrate covering a surface of the resonator substrate, the surface being on an opposite side of a surface facing the base substrate; a first excitation electrode formed on the surface of the resonator substrate facing the lid substrate; a second excitation electrode formed on the surface of the resonator substrate facing the base substrate, and a third electrode provided on the surface of the resonator substrate facing the base substrate, the third electrode being electrically connected to the first excitation electrode through a concave portion which is formed on a side surface of the resonator substrate in a positive direction of the X-axis.