Patent ID: 8604677

Claim:
A piezoelectric device, comprising: a tuning-fork type piezoelectric vibrating piece; and a package containing the piezoelectric vibrating piece, wherein the piezoelectric vibrating piece comprises a base fabricated of a piezoelectric material, first and second vibrating arms extending from the base parallel to each other in a first direction, and respective frequency-adjustment units on respective distal ends of the vibrating arms; and the package comprises a first metal film on an inner main surface of the package at which a laser beam can be irradiated; each frequency-adjustment unit comprises a second metal film extending at least in the first direction and a transparent region extending, parallel to the second metal film, at least in the first direction, the transparent region being transmissive to a laser beam having a power and wavelength sufficient to evaporate material from the first and second metal films if the laser beam is incident on respective ones or both of the first and second metal films.