Patent ID: 8760033

Claim:
A surface acoustic wave resonator provided on a quartz crystal substrate with Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦142°, and 42.79°≦|ψ|≦49.57°), comprising: an IDT which excites a stop band upper end mode surface acoustic wave; and inter-electrode finger grooves hollowed out of the substrate positioned between electrode fingers configuring the IDT, wherein when the wavelength of the surface acoustic wave is λ and the depth of the inter-electrode finger grooves is G, λ and G satisfy the relationship of 0.01 λ≦G and wherein, when the line occupation rate of the IDT is η, the inter-electrode finger groove depth G and line occupation rate η satisfy the relationships of −2.0000 ×G/λ+ 0.7200≦η≦−2.5000 ×G/λ+ 0.7775 provided that 0.0100.1λ ≦G≦ 0.0500λ −3.5898 ×G/λ+ 0.7995≦η≦−2.5000 ×G/λ+ 0.7775 provided that 0.0500λ< G≦ 0.0695λ.