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    • 5. 发明申请
    • SURFACE ACOUSTIC WAVE RESONATOR, SURFACE ACOUSTIC WAVE OSCILLATOR, AND ELECTRONIC APPARATUS
    • 表面声波谐振器,表面声波振荡器和电子设备
    • US20120049979A1
    • 2012-03-01
    • US13212714
    • 2011-08-18
    • Takuya OWAKIKeigo IIZAWAKunihito YAMANAKA
    • Takuya OWAKIKeigo IIZAWAKunihito YAMANAKA
    • H03H9/64
    • H03H9/02551H03B5/326H03H9/02661H03H9/0542H03H9/14538
    • A surface acoustic wave resonator includes: an IDT which is disposed on a quartz substrate with Euler angles of (−1°≦φ≦1°, 117°≦θ≦142°, 42.79°≦|ψ|≦49.57°, which is made of Al or alloy including Al as a main component and which excites a surface acoustic wave in an upper mode of a stop band; and an inter-electrode-finger groove which is formed by recessing the quartz substrate between electrode fingers which form the IDT. Here, the following expression is satisfied: 0.01λ≦G  (1), where λ represents a wavelength of the surface acoustic wave and G represents a depth of the inter-electrode-finger groove. The depth G of the inter-electrode-finger groove and a line occupancy η of the IDT satisfy the following expression: - 2.5 × G λ + 0.675 ≦ η ≦ - 2.5 × G λ + 0.775 ( 5 ) and a number of pairs N of the electrode fingers in the IDT is in the range of the following expression: 160≦N≦220  (19).
    • 表面声波谐振器包括:设置在石英基板上的IDT,欧拉角为(-1°& nlE;& nlE; 1°,117°≦̸&Thetas;≦̸ 142°,42.79°≦̸ |ψ |铝合金; 49.57°,其由Al或合金构成,以Al为主要成分,并且以阻挡带的上部模式激发表面声波;以及电极指槽,其通过使石英 形成IDT的电极指之间的基板,这里满足以下表达式:0.01λ≦̸ G(1)其中,λ表示声表面波的波长,G表示电极指间槽的深度。 电极指槽的深度G和IDT的线占有率等于以下表达式: - 2.5×Gλ+ 0.675≦̸&eegr≦̸ - 2.5×Gλ+ 0.775(5)和数字 在IDT中的电极指针对N的范围在以下范围内:160≦̸ N≦̸ 220(19)。