Importance

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Abstract

Grooves are provided on two main surfaces of a vibration arm. When a thickness of the vibration arm is T, a width of the main surface between an outer edge of the vibration arm and the groove in a plan view along a direction orthogonal to the extending direction of the main surface is W, a sum of depths of the grooves is ta, and ta/T is η, a region that satisfies a relationship of 4.236×10×η²−8.473×10×η+4.414×10 [μm]≦W [μm]≦−3.367×10×η²+7.112×10×η−2.352×10 [μm], and 0.75≦η<1.00 is present on at least a part of the vibration arm in the extending direction. When a length of the vibration arm in the extending direction is L, and a length of the weight section in the extending direction is H, a relationship of 0.012

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First Claim