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    • 1. 发明授权
    • Saw device
    • 锯装置
    • US5895996A
    • 1999-04-20
    • US647921
    • 1996-05-29
    • Michiaki TakagiEishi MomosakiYoshinori Ikusaka
    • Michiaki TakagiEishi MomosakiYoshinori Ikusaka
    • H03H9/02H03H9/145H03H9/25H01L41/08
    • H03H9/25H03H9/02543H03H9/02551H03H9/02834H03H9/02858H03H9/14547H03H9/14594
    • A SAW device utilizing elastic surface waves, in which the Q value indicating resonance sharpness is high, and which presents excellent frequency temperature characteristics and short-term frequency stability. In a SAW device according to the present invention, an IDT and two reflectors are in parallel in the propagation direction of the phase of the elastic surface waves. The IDT and reflectors are disposed to cover the power flow direction, which is the propagation direction of energy of the elastic surface waves, whereby the energy of the elastic surface waves is efficiently confined. Moreover, it becomes possible to manufacture the SAW device utilizing a piezoelectric crystal in which angle .theta. and angle .psi. indicating excellent frequency temperature characteristics are 25 to 45 degrees and 40 to 47 degrees, respectively. It is also possible to manufacture the SAW device utilizing a piezoelectric crystal where angle .psi. is related to angle .theta. such that .theta.=2.775.times.(.psi.-32.5)+6.5 where angle .theta. is in the range of 4 to 7 degrees.
    • PCT No.PCT / JP95 / 00312 Sec。 371日期:1996年5月29日 102(e)日期1996年5月29日PCT提交1995年2月28日PCT公布。 公开号WO96 / 10293 日期1996年4月4日一种利用弹性表面波的SAW器件,其中表示谐振锐度的Q值高,并且具有优异的频率温度特性和短期频率稳定性。 在根据本发明的SAW器件中,IDT和两个反射器在弹性表面波的相位的传播方向上是平行的。 IDT和反射器被设置为覆盖作为弹性表面波的能量的传播方向的功率流动方向,由此弹性表面波的能量被有效地限制。 此外,可以使用其中分别表示优异的频率温度特性的角度θ和角度psi分别为25至45度和40至47度的压电晶体来制造SAW器件。 也可以制造使用角度psi与角度θ相关的压电晶体的SAW器件,使θ= 2.775×(psi-32.5)+ 6.5,其中角度θ在4至7度的范围内。