Patent ID: 7355319

Claim:
A boundary acoustic wave device using a Stoneley wave, comprising: a piezoelectric substance primarily composed of LiNbO 3 ; a dielectric substance disposed on one surface of the piezoelectric substance; and electrodes provided at a boundary between the piezoelectric substance and the dielectric substance; wherein Euler angles (Ï†, Î¸, Ïˆ) of the piezoelectric substance primarily composed of LiNbO 3 are within ranges shown in the following table, and a Stoneley wave having an acoustic velocity of about 3,757 m/sec or less is used: Ï† (Â°) Î¸ (Â°) Ïˆ (Â°) 30 90 225 30 270 135 30 270 315 90 90 135 90 90 315 90 270 45 90 270 225 150 90 45 150 90 225 150 270 135 150 270 315 210 90 135 210 90 315 210 270 45 210 270 225 270 90 45 270 90 225 270 270 135 270 270 315 330 90 135 330 90 315 330 270 45 330 270 225.