Patent ID: 7471171
Filing Date: 2008-12-30
Classification: H03H

Abstract:
1. An elastic boundary wave device comprising: a LiNbO an electrode exciting an elastic wave and provided on the substrate; and a silicon oxide film provided on the substrate to cover the electrode, wherein parameters of the elastic boundary wave device have any one of ranges below, where “θ” is a rotation Y cut angle of the substrate, “a” is a ratio of copper density with respect to a density of a material used as the electrode, “λ” is a wavelength of the elastic wave excited by the electrode, “h” is a film thickness of the electrode, “H” is a thickness of the silicon oxide film: when 0.045λ/a≦h<0.0525λ/a, and when 25°≦θ<26.5°, 0.39λ≦H<0.46λ, when 26.5°≦θ<27.5°, 0.41λ≦H<0.48λ, when 27.5°≦θ<28.5°, 0.42λ≦H<0.51λ, when 28.5°≦θ<29.5°, 0.43λ≦H<0.53λ, when 29.5°≦θ<30.5°, 0.45λ≦H<0.56λ, when 30.5°≦θ<31.5°, 0.46λ≦H<0.58λ, when 31.5°≦θ<32.5°, 0.47λ≦H<0.61λ, when 32.5°≦θ<33.5°, 0.48λ≦H<0.64λ, when 33.5°≦θ<35°, 0.48λ≦H<0.67λ, when 35°≦θ<37.5°, 0.5λ≦H<0.74λ, when 37.5°≦θ<42°, 0.52λ≦H<0.8λ, when 42°≦θ<57°, 0.55λ≦H<0.8λ, when 57°≦θ<63°, 0.51λ≦H<0.8λ, when 63°≦θ<69°, 0.46λ≦H<0.8λ, when 69°≦θ<75°, 0.39λ≦H<0.8λ, when 75°≦θ<99°, 0.3λ≦H<0.8λ, and when 99°≦θ<105°, 0.58λ≦H<0.8λ, when 0.0525λ/a≦h<0.065λ/a and when 24°≦θ<25°, 0.3λ≦H<0.32λ, when 25°≦θ<26.5°, 0.3λ≦H<0.37λ, when 26.5°≦θ<27.5°, 0.33λ≦H<0.38λ, when 27.5°≦θ<28.5°, 0.34λ≦H<0.41λ, when 28.5°≦θ<29.5°, 0.37λ≦H<0.43λ, when 29.5°≦θ<30.5°, 0.39λ≦H<0.44λ, when 30.5°≦θ<31.5°, 0.42λ≦H<0.47λ, when 31.5°≦θ<32.5°, 0.44λ≦H<0.48λ, when 32.5°≦θ<33.5°, 0.47λ≦H<0.49λ, when 33.5°≦θ<34.5°, 0.47λ≦H<0.51λ, when 34.5°≦θ<35.5°, 0.48λ≦H<0.57λ, when 35.5°≦θ<36.5°, 0.5λ≦H<0.62λ, when 36.5°≦θ<38°, 0.52λ≦H<0.67λ, when 38°≦θ<40.5°, 0.54λ≦H<0.79λ, when 40.5°≦θ<43.5°, 0.58λ≦H<0.8λ, when 43.5°≦θ<46.5°, 0.61λ≦H<0.8λ, when 46.5°≦θ<51°, 0.64λ≦H<0.8λ, when 51°≦θ<57°, 0.69λ≦H<0.8λ, and when 57°≦θ<63°, 0.78λ≦H<0.8λ, when 0.065λ/a≦h<0.0725λ/a and when 25.5°≦θ<26.5°, 0.3λ≦H<0.32λ, when 26.5°≦θ<27.5°, 0.3λ≦H<0.36λ, when 27.5°≦θ<28.5°, 0.3λ≦H<0.38λ, when 28.5°≦θ<29.5°, 0.32λ≦H<0.43λ, when 29.5°≦θ<30.5°, 0.34λ≦H<0.46λ, when 30.5°≦θ<31.5°, 0.36λ≦H<0.5λ, when 31.5°≦θ<32.5°, 0.39λ≦H<0.55λ, when 32.5°≦θ<33.5°, 0.43λ≦H<0.6λ, when 33.5°≦θ<35°, 0.46λ≦H<0.66λ, when 35°≦θ<36.5°, 0.54λ≦H<0.8λ, when 36.5°≦θ<37.5°, 0.59λ≦H<0.8λ, when 37.5°≦θ<38.5°, 0.65λ≦H<0.8λ, and when 38.5°≦θ<39°, 0.73λ≦H<0.8λ, when 0.0725λ/a≦h<0.0775λ/a and when 26.5°≦θ<27.5°, 0.3λ≦H<0.35λ, when 27.5°≦θ<28.5°, 0.3 λ≦H<0.39λ, when 28.5°≦θ<29.5°, 0.3λ≦H<0.43λ, when 29.5°≦θ<30.5°, 0.33λ≦H<0.49λ, when 30.5°≦θ<31.5°, 0.35λ≦H<0.56λ, when 31.5°≦θ<32.5°, 0.39λ≦H<0.63λ, when 32.5°≦θ<33.5°, 0.43λ≦H<0.75λ, when 33.5°≦θ<34.5°, 0.47λ≦H<0.8λ, when 34.5°≦θ<35.5°, 0.52λ≦H<0.8λ, when 35.5°≦θ<36.5°, 0.57λ≦H<0.8λ, when 36.5°≦θ≦37.5°, 0.63λ≦H<0.8λ, and when 37.5°≦θ<38.5°, 0.72λ≦H<0.8λ, when 0.0775λ/a≦h<0.0825λ/a and when 26.5°≦θ<27.5°, 0.3λ≦H<0.34λ, when 27.5°≦θ<28.5°, 0.3λ≦H<0.41λ, when 28.5°≦θ<29.5°, 0.3λ≦H<0.47λ, when 29.5°≦θ<30.5°, 0.32λ≦H<0.56λ, when 30.5°≦θ<31.5°, 0.36λ≦H<0.69λ, when 31.5°≦θ<32.5°, 0.39λ≦H<0.8λ, when 32.5°≦θ<33.5°, 0.44λ≦H<0.8λ, when 33.5°≦θ<35°, 0.5λ≦H<0.8λ, when 35°≦θ<36.5°, 0.65λ≦H<0.8λ, and when 36.5°≦θ<38°, 0.77λ≦H<0.8λ, when 0.0825λ/a≦h<0.0875λ/a and when 26.5°≦θ<27.5°, 0.3λ≦H<0.36λ, when 27.5°≦θ<28.5°, 0.3λ≦H<0.44λ, when 28.5°≦θ<29.5°, 0.3λ≦H<0.57λ, when 29.5°≦θ<30.5°, 0.32λ≦H<0.8λ, when 30.5°≦θ<31.5°, 0.37λ≦H<0.8λ, when 31.5°≦θ<32.5°, 0.43λ≦H<0.8λ, when 32.5°≦θ<33.5°, 0.51λ≦H<0.8λ, when 33.5°≦θ<34.5°, 0.59λ≦H<0.8λ, and when 34.5°≦θ<35.5°, 0.72λ≦H<0.8 λ. when 0.0875λ/a≦h<0.0925λ/a and when 26.5°≦θ<27.5°, 0.3λ≦H<0.39λ, when 27.5°≦θ<28.5°, 0.3λ≦H<0.58λ, when 28.5°≦θ<29.5°, 0.3λ≦H<0.8λ, when 29.5°≦θ<30.5°, 0.33λ≦H<0.8λ, when 30.5°≦θ<31.5°, 0.43λ≦H<0.8λ, when 31.5°≦θ<32.5°, 0.53λ≦H<0.8λ, and when 32.5°≦θ<33.5°, 0.67λ≦H<0.8λ, when 0.0925λ/a≦h<0.0975λ/a and when 26.5°≦θ<27.5°, 0.3λ≦H<0.63λ, when 27.5°≦θ<28.5°, 0.3λ≦H<0.8λ, when 28.5°≦θ<29.5°, 0.3λ≦H<0.8λ, when 29.5°≦θ<30.5°, 0.42λ≦H<0.8λ, and when 30.5°≦θ<31.5°, 0.6λ≦H<0.8λ, when 0.0975λ/a≦h<0.1025λ/a and when 25.5°≦θ<26.5°, 0.32λ≦H<0.7λ, when 26.5°≦θ<27.5°, 0.3λ≦H<0.8λ, when 27.5°≦θ<28.5°, 0.3λ≦H<0.8λ, and when 28.5°≦θ<29.5°, 0.45λ≦H<0.8λ, when 0.1025λ/a≦h<0.1125λ/a and when 24.5°≦θ<25.5°, 0.6λ≦H<0.8λ, when 25.5°≦θ<26.5°, 0.3λ≦H<0.8λ, when 26.5°≦θ<27.5°, 0.3λ≦H<0.8λ, and when 27.5°≦θ<28.5°, 0.3λ≦H<0.33λ and 0.64λ≦H<0.8λ, and when 0.1125λ/a≦h<0.12λ/a and when 22.5°≦θ<23.5°, 0.47λ≦H<0.76λ, and when 23.5°≦θ<24.5°, 0.36λ≦H<0.45 λ.