Patent ID: 8823247

Claim:
A piezoelectric device, comprising: a package base having a rectangular profile, the package base including an outer main surface including a pair of external electrodes and an inner main surface situated opposite the outer main surface, the inner main surface defining a first recess and a first bonding surface peripherally surrounding the first recess, and including respective connecting electrodes electrically connected to the external electrodes; a piezoelectric vibrating piece mounted to the inner main surface of the package base and including respective excitation electrodes electrically connected to the connecting electrodes; a package lid defining a second recess and a second bonding surface, the second bonding surface having a width and peripherally surrounding the second recess, the second recess being larger than the first recess, and the lid covering the piezoelectric vibrating piece mounted to the package base; and a sealing material, having a width substantial equal to the width of the second bonding surface, disposed circumferentially between the first bonding surface and the second bonding surface, thereby sealing the package lid to the package base, wherein the package base has a rectangular plan profile, when viewed from above, that includes first and second opposing edges, each edge having a length and defining a respective castellation in a center of the respective edge, each respective castellation having a length that is ⅓ to ½ the length of the respective edge, each connecting electrode is situated in a respective one of said castellations, wherein each connecting electrode has a length that is greater than ½ the length of the respective castellation, and each connecting electrode has a length that is greater than ¼ the length of the respective edge.