Importance

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Abstract

A vibration device includes: a vibrating reed including a base having a notch, a plurality of vibrating arms extending from the base, and each including an arm section, a weight section, and a groove section, and a support section, wherein a mechanical resonant frequency f of the vibrating reed is higher than a thermal relaxation frequency f₀ of the vibrating reed, and assuming that a closest approach distance between the notch and a crotch section formed between the vibrating arms is a base flexion width Wb, and an arm width of the vibrating arm in a case of replacing a cross-sectional shape of the vibrating arm having a thermoelastic loss equivalent to a thermoelastic loss of the cross-sectional shape and a thickness equal to a thickness of the cross-sectional shape is an effective arm width We, a relationship of Wb>We is satisfied.

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First Claim