| 摘要 |
PROBLEM TO BE SOLVED: To provide a vibration piece which allow for increase in the impact resistance and enhancement of Q value, and to provide a vibrator, an oscillator, an electronic apparatus and a mobile including such a vibration piece.SOLUTION: A vibration piece 2 satisfies a relationship 14.2%<&eegr;<100%, where W1 is the width of the arms 50, 60 of vibration arms 5, 6 in the X axis direction, W3 is the width of two parts sandwiching a groove 55 in the X axis direction, in the principal surface of the vibration arm 5, and 2×W3/W1 is &eegr;. |
