Patent ID: 8008838

Claim:
A Lamb wave type elastic wave device having an interdigital transducer for generating at least one Lamb wave type elastic wave, or the interdigital transducer and a reflector, arranged on a quartz substrate, a cut angle of the quartz substrate and a propagation direction of the Lamb wave type elastic wave expressed in Euler angles (λ, μ, θ) satisfying any one of following expressions (Expressions 1 to 3) Λ=88° to 92°, μ=17° to 21° or μ=159° to 163°, θ=0° to 10° (Expression 1) λ=208° to 212°, μ=17° to 21° or μ=159° to 163°, θ=0° to 10° (Expression 2) λ=328° to 332°, μ=17° to 21° or μ=159° to 163°, θ=0° to 10°. (Expression 3)