Patent ID: 8716922

Claim:
A tuning-fork type piezoelectric vibrating piece, comprising: a connecting electrode electrically connectable to an internal conductive member of a package; and a base and a pair of vibrating arms made of a piezoelectric material, the vibrating arms extending in a prescribed direction from the base and comprising at least one excitation electrode electrically connected to the connecting electrode, each vibrating arm comprising upper and lower main surfaces each defining a respective groove extending in the prescribed direction, and each vibrating arm comprising edge-side surfaces extending between the first and second main surfaces; wherein the excitation electrode includes a surface electrode located inside the grooves on the main surfaces of at least one vibrating arm and a side electrode located on the edge-side surfaces of the at least one vibrating arm; wherein the connecting electrode and the at least one excitation electrode each comprise a first metal layer formed on the piezoelectric material and a second metal layer formed on the first metal layer; and wherein the second metal layer thickness of the surface electrode is 30% to 80% of the second metal layer thickness of the connecting electrode.