Abstract: A quartz crystal resonator element includes an AT-cut quartz crystal substrate, the substrate having edges parallel to each of a Z? axis obtained by rotating a Z? axis in a range of ?120° to +60° about a Y? axis and an X? axis perpendicular to the Z? axis when an angle formed by rotating a +Z? axis in a direction of a +X axis about the Y? axis is a positive rotation angle; a thin section that forms a resonating section; and a thick section adjacent to the resonating section, the thin section and the thick section being formed on the quartz crystal substrate by wet etching. The thin section is formed either on a main surface of the substrate corresponding to a +Y?-axis side or on a main surface of the substrate corresponding to a ?Y?-axis side.

Abstract: A piezoelectric vibrator element provided by performing wet etching on a piezoelectric substrate includes: a thin-wall section including a vibrating section; a thick-wall section thicker than the thin-wall section; and a slit section penetrating in a thickness direction, wherein the slit section is disposed in an area intervening between the thin-wall section and the thick-wall section.

Abstract: A quartz crystal resonator element includes an AT-cut quartz crystal substrate, the substrate having edges parallel to each of a Z? axis obtained by rotating a Z? axis in a range of ?120° to +60° about a Y? axis and an X? axis perpendicular to the Z? axis when an angle formed by rotating a +Z? axis in a direction of a +X axis about the Y? axis is a positive rotation angle; a thin section that forms a resonating section; and a thick section adjacent to the resonating section, the thin section and the thick section being formed on the quartz crystal substrate by wet etching. The thin section is formed either on a main surface of the substrate corresponding to a +Y?-axis side or on a main surface of the substrate corresponding to a ?Y?-axis side.

Abstract: A quartz crystal resonator element includes an AT-cut quartz crystal substrate, the substrate having edges parallel to each of a Z? axis obtained by rotating a Z? axis in a range of ?120° to +60° about a Y? axis and an X? axis perpendicular to the Z? axis when an angle formed by rotating a +Z? axis in a direction of a +X axis about the Y? axis is a positive rotation angle; a thin section that forms a resonating section; and a thick section adjacent to the resonating section, the thin section and the thick section being formed on the quartz crystal substrate by wet etching. The thin section is formed either on a main surface of the substrate corresponding to a +Y?-axis side or on a main surface of the substrate corresponding to a ?Y?-axis side.

Abstract: A quartz crystal resonator element includes an AT-cut quartz crystal substrate, the substrate having edges parallel to each of a Z? axis obtained by rotating a Z? axis in a range of ?120° to +60° about a Y axis and an X? axis perpendicular to the Z? axis when an angle formed by rotating a +Z? axis in a direction of a +X axis about the Y? axis is a positive rotation angle; a thin section that forms a resonating section; and a thick section adjacent to the resonating section, the thin section and the thick section being formed on the quartz crystal substrate by wet etching. The thin section is formed either on a main surface of the substrate corresponding to a +Y?-axis side or on a main surface of the substrate corresponding to a ?Y?-axis side.