Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2007-03-07
2008-11-25
San Martin, J. A (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S31300R, C333S189000, C333S195000
Reexamination Certificate
active
07456544
ABSTRACT:
A boundary acoustic wave device is provided in which an increase in the conductor resistance can be suppressed and a satisfactorily high electromechanical coupling coefficient K2can be achieved even when the frequency is increased. The boundary acoustic wave device includes a first medium, a second medium, and an IDT provided therebetween. In the boundary acoustic wave device, a plane that separates the IDT into two equal parts in the thickness direction is defined as a boundary plane, the energy of boundary acoustic waves that is present at the first medium side of the boundary plane is represented by E1, and the energy that is present at the second medium side of the boundary plane is represented by E2. Furthermore, under the condition that an IDT including only the conductive layer having the highest density among the plurality of conductive layers constituting the IDT is configured so that the sound velocity of boundary acoustic waves when the IDT includes the plurality of conductive layers is equal to the sound velocity of boundary acoustic waves when the IDT includes only the conductive layer having the highest density, the energy of boundary acoustic waves that is present at the first medium side of the boundary plane is represented by E1′ and the energy that is present at the second medium side of the boundary plane is represented by E2′. In this case, the relationship E1/E2>E1′/E2′is satisfied.
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Dickstein & Shapiro LLP
Martin J. A San
Murata Manufacturing Co. Ltd.
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