Patent ID: 7388318
Filing Date: 2008-06-17
Classification: H03H

Abstract:
1. A thin film piezoelectric device including a substrate having a plurality of vibration spaces and a piezoelectic laminated structure formed on the substrate, a plurality of thin film piezoelectric resonators being formed facing the vibration spaces, wherein the piezoelectric laminated structure has at least a piezoelectric film and a metal electrode formed on at least a part of each of opposite surfaces of the piezoelectric film, the piezoelectric laminated structure comprises diaphragms positioned facing the vibration spaces, and a support area other than the diaphragms, at least one set of two adjacent thin film piezoelectric resonators are electrically connected to each other through the metal electrode, the thin film piezoelectric device comprising at least one set of two adjacent thin film piezoelectric resonators in which D 0 is a distance between the centers of the diaphragms of the two electrically connected adjacent thin film piezoelectric resonators and D 1 is a length of a segment of a support area on a straight line passing through centers of the diaphragms of two electrically connected adjacent thin film piezoelectric resonators, and a ratio D 1 /D 0 is 0.1 to 0.5.