| 摘要 |
PURPOSE:To lower the CI of overtone by forming an oblique side in the X direction of an rectangular AT oscillation chip for overtone. CONSTITUTION:An oblique side is formed in the X direction of the rectangular AT vibration chip 1 whose external size is <=7mm in the X direction, <=2mm or in the direction Z', and <=0.24mm and >=0.12mm in the direction Y'. That is, the oblique side 3 is formed by the beveling or convex processing on the major plane 2 and the end in the X direction of the rectangular AT vibration chip 1. Even when the size of the vibration chip is made small as <=7mm in the direction X and <=2mm in the direction Z' in such a way, since the oblique side 3 is formed in the X direction, the CI of the third harmonic overtone is lowered by the energy confinement effect.
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