Patent ID: 8519601

Claim:
A crystal device, comprising: a crystal plate having a rectangular shape and comprising a pair of long sides and a pair of short sides; a pair of excitation electrodes respectively configured on a front side and a back side of the crystal plate; a pair of extraction electrodes extending from the pair of excitation electrodes; a pair of electrode pads configured along at least one of the pair of short sides of the crystal plate and electrically connected with the pair of extraction electrodes; a package having a mounting surface and a bottom surface opposite to the mounting surface and comprising a pair of mounting terminals configured on the mounting surface and a pair of connection terminals configured on the bottom surface and electrically connected with the pair of mounting terminals; and an electrically-conductive adhesive agent bonding and fixing the pair of connection terminals and the pair of electrode pads, wherein a bonding status inspection region, on which no metal film is formed, is configured in the crystal plate and surrounded by or connected to the pair of electrode pads, and the bonding status inspection region occupies not more than 25% of an area of the pair of electrode pads.