Patent ID: 8665032

Claim:
A vibrator comprising: a vibration arm extending from a base end toward a tip; a base joined to the vibration arm at the base end; and supporting arms arranged on both sides of the base in a width direction perpendicular to an extending direction of the vibration arm and joined to the base, wherein the base has a reduced cross-section portion disposed along the extending direction of the vibration arm between a joint portion with the vibration arm and a joint portion with the supporting arms, the reduced cross-section portion having a reduced cross-section extending along both sides of the base, the reduced cross-section being less than a cross-section of a remaining portion of the base, wherein the reduced cross-section portion is disposed so as to satisfy a relationship 2×W 1 ≦L≦6×W 1 where L is the length of the reduced cross-section portion in the extending direction of the vibration arm, and W 1 is the arm width of the vibration arm, wherein the vibration arm includes a pair of vibration arms extending in parallel from the base, and the reduced cross-section portion is disposed so as to satisfy a relationship W 3 <W 2 where W 2 is the width between outer side edges of the pair of vibration arms, and W 3 is the width of the reduced cross-section portion.