Patent ID: 7589458

Claim:
A quartz crystal vibrator comprising: a quartz crystal vibrating plate formed by surrounding a quartz crystal vibrating piece by a frame-like portion; an inner electrode provided at the quartz crystal vibrating piece for applying a voltage to the quartz crystal vibrating piece; a hermetically closed vessel including a lid member and a base member in a plate-like shape for interposing the quartz crystal vibrating plate in a thickness direction thereof; bonding electrodes for bonding provided between the lid member and the quartz crystal vibrating plate and between the base member and the quartz crystal vibrating plate and electrically connected to the inner electrode; and a protecting film provided at an outer face of the hermetically closed vessel for protecting the bonding electrode; wherein recess portions recessed to inner sides of the hermetically closed vessel are provided at an outer edge portion between the lid member and the quartz crystal vibrating plate and between the base member and the quartz crystal vibrating plate, the protecting film is provided at the recess portion; wherein the bonding electrode is disposed on the inner side of the recess portion; and wherein the recess portion comprises a step which defines in the recess portion an outer section open to outside of the quartz crystal vibrator and an inner section located inside the recess portion more internally than the outer section, such that the recess portion is made wider at the outer section than at the inner section.