Patent ID: 7608986

Claim:
A quartz crystal resonator, comprising: a quartz crystal resonator element having a main surface including an X axis (electrical axis) and a Z′ axis of an inclination rotated at an angle (y) equal to or greater than 36.4 degrees and equal to or smaller than 40.5 degrees from a Z axis (optical axis) around the X axis, a main vibrating portion vibrating at a predetermined resonance frequency (f) and a supporting portion integrally formed with the main vibrating portion in such a manner as to be formed peripherally to surround the main vibrating portion; two covers having a thermal expansion coefficient equal to or greater than 6 ×10 −6 per degrees centigrade and equal to or smaller than 10×10 −6 per degrees centigrade and bonded to the supporting portion so as to sandwich the quartz crystal resonator element therebetween; a circuit section, which is disposed under a lower cover and is electrically connected with the quartz crystal resonator element; and a circuit substrate, which is located under the circuit section.