| 摘要 |
[Problem] To provide a piezoelectric oscillation device having an external connection terminal on which a distinguishable mark with high distinguishability is formed, while accommodating a reduction in size and ensuring a bonding area with an external circuit substrate. [Solution] A crystal oscillator 1 comprises a base 2 provided with a substrate portion 20, a first frame portion 21, and a second frame portion 22, a crystal oscillation element 3 stored in a first depression portion E1, a thermistor 4 stored in a second depression portion E2, and a lid 5 for hermetically sealing the first depression portion E2. L-shaped external connection terminals 9a to 9d are formed at four corners on an upper surface of the second frame portion. Further, between internal edge portions of the external connection terminals at the four corners and an inner circumferential edge 221 of the second frame portion, electrodeless bank areas 9e, 9f, 9g, and 9h are formed. The external connection terminal 9c includes a protrusion portion 92c formed spaced apart from an outer circumferential edge 220 and the inner circumferential edge 221 of the second frame portion. |
