Patent ID: 8100011

Claim:
A piezoelectric device, comprising: a substrate having an arm portion; a piezoelectric member disposed on the substrate; a drive electrode which oscillates the arm portion by a piezoelectric operation of the piezoelectric member; a first detection electrode and a second detection electrode which detect a Coriolis force which occurs in the arm portion which oscillates; a first lead electrode which has a first total area, the first lead electrode being disposed on the substrate and connected to the first detection electrode, the first lead electrode connecting the first detection electrode to an outside of the piezoelectric device, wherein the first lead electrode has (i) a first lead wire connected to a connection portion of the first detection electrode having a first length, and (ii) a first pad connected to the first lead wire having a first pad area; a second lead electrode which has a second total area which is substantially the same as the first total area, the second lead electrode being disposed on the substrate in a shape asymmetrical to the first lead electrode with respect to an axis in a longitudinal direction of the arm portion and connected to the second detection electrode, the second lead electrode connecting the second detection electrode to the outside of the piezoelectric device, wherein the second lead electrode has (i) a second lead wire connected to a connection portion of the second detection electrode having a second length larger than the first length, and (ii) a second pad connected to the second lead wire having a second pad area smaller than the first pad area; and a third lead electrode which connects the drive electrode to the outside of the piezoelectric device.