| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an AT-cut crystal vibrating piece which specifies the short side dimension of a vibration part in order to demonstrate high effects for the reduction of a CI value and the suppression of unrequired-mode coupling. <P>SOLUTION: For the AT-cut crystal vibrating piece, the vibration part 14 whose thickness dimension is larger than that of a periphery 16 is formed on the plate surface of a piezoelectric substrate 12 for which thickness slide vibration is the main vibration. When the dimension of the short side of the piezoelectric substrate 12 is defined as Z, the thickness dimension of the piezoelectric substrate 12 in the vibration part 14 is defined as t and the dimension of the short side in the vibration part 14 is defined as Mz, it is determined so as to satisfy the relationship of 15.68≤Z/t≤15.84 and 0.77≤Mz/Z≤0.82. <P>COPYRIGHT: (C)2010,JPO&INPIT |
