Piezoelectric resonator and electrode structure thereof

An electrode structure of a piezoelectric resonator, the structure comprising first and second electrode layers stacked on main surfaces of a piezoelectric body,

• the first electrode layer including at least one material selected from the group consisting of chromium (Cr), nickel (Ni), titanium (Ti), and alloys thereof, and the ratio of the thickness of the first electrode layer to the overall electrode thickness being 3% to 30%;
• and the second electrode layer including copper (Cu) or an alloy including copper (Cu), and the ratio of the thickness of the second electrode layer to the overall electrode thickness being 70% to 97%.

An electrode structure of a piezoelectric resonator, the electrode structure comprising first and second electrode layers stacked on main surfaces of a piezoelectric body,

• the first electrode layer including first and third layers including at least one material selected from the group consisting of chromium (Cr), nickel (Ni), titanium (Ti), and alloys thereof, and the ratio of the thickness of the first electrode layer to the overall electrode thickness being 3% to 30%;
• and the second electrode layer including a second layer including copper (Cu) or an alloy including copper (Cu) and a fourth layer including silver (Ag) or an alloy including silver (Ag), and the ratio of the thickness of the second electrode layer to the overall electrode thickness being 70% to 97%.