| 摘要 |
PROBLEM TO BE SOLVED: To lower a CI value of a fundamental wave by preventing oscillation of higher harmonic waves. SOLUTION: Vibration arms 14 each have first and second side faces 21 and 22 connected to both sides of front and rear faces 16. In each of the front and rear faces 16, a groove 30 extended in the length direction of the vibrating arm 14 is formed. Each groove 30 includes first and second internal faces 31 and 32 which are extended back to back with the first and second side faces 21 and 22, respectively. The pair of vibration arms 14 flexurally vibrates in such a manner that each other's first and second side faces 21 and 22 may be drawn near to and separate from each other's first and second side faces. Each vibration arm 14 has a first flexural portion 18 which bends most in a connecting portion 24 with respect to a base portion 12, and has a second flexural portion 20 which bends most next after the connecting portion 24 in a portion wherein an intermediate portion in the length direction of the groove 30 is formed. The distance between the first side face 21 and the first internal face 31 (or between the second side face 22 and the second internal face 32) is largest at the second flexural portion 20. COPYRIGHT: (C)2009,JPO&INPIT
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