| 摘要 |
An elastic boundary wave device includes an IDT including laminated conductor layers disposed between a first medium and a second medium, wherein a plane that divides the IDT in half in the thickness direction defines an interface, the energy of an elastic boundary wave present on the side of the first medium of the interface is denoted as E 1 , and the energy of an elastic boundary wave present on the side of the second medium of the interface is denoted as E 2 , and wherein if the IDT included only a conductor having the highest density among the laminated conductor layers of the IDT, when the energy of an elastic boundary wave present on the side of the first medium of the interface is denoted as E 1 ' and the energy of an elastic boundary wave present on the side of the second medium of the interface is denoted as E 2 ', the energies of an elastic boundary wave would satisfy the relationship of E 1 /E 2 <E 1 '/E 2 ' so that the sonic velocity of an elastic boundary wave in the IDT including the laminated conductor layers is equal to the sonic velocity of an elastic boundary wave if the IDT included only the conductor layer having the highest density.
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