| US 7,579,762 B2 | ||
| Piezoelectric vibrating piece and piezoelectric vibrating device | ||
| Takehiro Takahashi, Sayama (Japan) | ||
| Assigned to Nihon Dempa Kogyo Co., Ltd., Tokyo (Japan) | ||
| Filed on Dec. 13, 2007, as Appl. No. 11/956,254. | ||
| Claims priority of application No. 2006-354725 (JP), filed on Dec. 28, 2006. | ||
| Prior Publication US 2008/0157630 A1, Jul. 03, 2008 | ||
| Int. Cl. H01L 41/047 (2006.01) | ||
| U.S. Cl. 310—364 [310/363; 310/346] | 20 Claims |
| 1. A piezoelectric vibrating piece having a first surface and a second surface at an opposing side of the first surface comprising:
a piezoelectric piece having a designated coefficient of thermal expansion;
a first electrode film having a bigger coefficient of thermal expansion than the designated coefficient of thermal expansion
and formed on the first surface; and
a second electrode film having a smaller coefficient of thermal expansion than the designated coefficient of thermal expansion
and formed on the second surface.
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