Patent ID: 8179021

Claim:
A piezoelectric transducer, comprising: a piezoelectric oscillation piece which has a pair of oscillation arms disposed in parallel with each other, base ends of which are fixed to a base of the piezoelectric oscillation piece, and has weight metal films formed near tips of the oscillation arms; a base substrate on an upper surface of which the piezoelectric oscillation piece is mounted; a lid substrate joined with the base substrate such that the mounted piezoelectric oscillation piece is accommodated in a cavity; and a control film disposed on one of the substrates to increase a degree of vacuum inside the cavity when heated, the control film being extensive adjacent to one of the oscillation arms, as viewed in a plan view, from a side of the base end to a side of the tip in a longitudinal direction of the oscillation arms, wherein the control film is so disposed with respect to the one oscillation arm that when heated a part of the control film is deposited locally on a side surface of the one oscillation arm adjacent to the control film.