Patent ID: 9537464
Date: 2017-01-03
CPC Classifications: H03B,H03H

Claim:
1. A surface acoustic wave resonator comprising: an IDT that is disposed on a quartz crystal substrate of Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦142°, ψ) and excites a surface acoustic wave resonant in an upper part of a stop-band of the IDT; and inter-electrode finger grooves that are acquired by depressing the substrate located between electrode fingers configuring the IDT; and wherein, in a case where a wavelength of the surface acoustic wave is λ, and a depth of the inter-electrode finger grooves is G, 0.01λ≦G is satisfied, wherein, in a case where a line occupancy ratio of the IDT is η, the depth G of the inter-electrode finger grooves and the line occupancy ratio η satisfy one of the following relationships: wherein, in a case where a film thickness of the electrode fingers of the IDT is H and a relationship of 0<H≦0.005λ is satisfied, the following relationships are satisfied: wherein, in a case where a relationship of 0.005λ<H≦0.010λ is satisfied, the following relationships are satisfied: wherein, in a case where a relationship of 0.010λ<H≦0.015λ is satisfied, the following relationships are satisfied: wherein, in a case where a relationship of 0.015λ<H≦0.020λ is satisfied, the following relationships are satisfied: wherein, in a case where a relationship of 0.020λ<H≦0.025λ is satisfied, the following relationships are satisfied: wherein, in a case where a relationship of 0.025λ<H≦0.030λ is satisfied, the following relationships are satisfied: wherein, in a case where a relationship of 0.030λ<H≦0.035λ is satisfied, the following relationships are satisfied: