Patent ID: 7279824
Filing Date: 2007-10-09
Classification: H03H

Abstract:
1. A piezoelectric device comprising: a package including a first substrate, a second substrate, and a through hole formed through the first substrate and the second substrate, the through hole including a first hole formed in the first substrate and a second hole formed in the second substrate, the second hole having a diameter that is less than a diameter of the first hole; a metal sealant disposed in the first hole and the second hole; an electrode portion formed on the second substrate and spaced apart from the second hole; a base portion disposed on the electrode portion and including a notch part; a plurality of resonating arms disposed on the package and extending from and parallel to the base portion, the plurality of resonating arms including a groove part formed on a front surface and a back surface of the resonating arms; and a driving electrode disposed in the groove part of the resonating arms and including a lower layer and an electrode layer formed on the lower layer, the lower layer including a thickness t in a range of 0.07 micrometers<t<0.3 micrometers; wherein the second substrate is disposed between the first substrate and the plurality of resonating arms.