Patent ID: 8120178

Claim:
A tuning fork vibration device comprising: a SOI substrate having a substrate, an oxide layer formed above the substrate, and a semiconductor layer formed above the oxide layer; a tuning fork type vibration section that is formed by processing the semiconductor layer and the oxide layer and is composed of the semiconductor layer; and a driving section for generating flexural vibration of the tuning fork type vibration section; wherein the tuning fork type vibration section includes a support section and two beam sections cantilevered over a first opening section formed in the oxide layer, wherein the first opening section is formed below the entirety of the support section and the beam sections, wherein the support section and the beam sections are formed in a cantilever shape with the support section as a base of the beam sections, and wherein the driving section includes a pair of drivers formed only on each of the two beam sections, each of the drivers including a first electrode layer, a piezoelectric thin film of lead zirconate titantate or a solid solution of lead zirconate titantate formed above the first electrode layer, and a second electrode layer formed above the piezoelectric thin film, and wherein a first driver disposed on an outer side of one of the two beam sections and a third driver disposed on an outer side of the other of the two beam sections are electrically connected to each other, and a second driver disposed on an inner side of the one of the two beam sections and a fourth driver disposed on an inner side of the other of the two beam sections are electrically connected to each other.