Nihon Dempa Kogyo Co., Ltd.

Yuichi Kawase

Toshiaki Motegi

Shingo Kawanishi

The piezoelectric device comprises a piezoelectric vibrating piece having a base portion, a pair of vibrating arms extending in a specified direction from the base portion, and a pair of connection portions disposed on the pair of the supporting arms; a package having a bottom surface which accommodates the piezoelectric vibrating piece and side faces surrounding the bottom surface, in which a pair of electrode pads corresponding to the connection portions are formed on the bottom surface; and adhesive for bonding the pair of the electrode pads with the pair of connection portions. One electrode pad and the other electrode pad, with adhesive applied to the electrode pads, are shifted with respect to each other in a predetermined direction.

Piezoelectric device with asymmetrically mounted tuning-fork type piezoelectric vibrating piece

The piezoelectric devices allow outside-in adjustment of their vibration frequency. An exemplary piezoelectric device includes a tuning-fork type piezoelectric vibrating piece mounted inside a package. The vibrating piece has a base fabricated of a piezoelectric material, a pair of vibrating arms extending parallel from the base in a predetermined direction, and a frequency-adjustment unit situated on the distal ends of the vibrating arms. The package includes first metal films on the inner main surface thereof where an external laser beam can be irradiated. The frequency-adjustment unit includes a transparent region extending in a predetermined direction, allowing the laser beam, passing through the lid of the package, to be incident on second metal films by passing through the transparent regions. The laser beam also can be incident on first metal films without also being incident on the second metal films, by passing through the lid but not through the transparent regions.

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Sayama, Japan

Yuichi Kawase