Patent ID: 7446461

Claim:
A crystal oscillator used as a clock source having an angular velocity detection capability, comprising: a tuning fork type crystal unit provided with excitation electrodes for exciting tuning fork vibration of the crystal unit and sensing electrodes for detecting electric charge generated in the crystal unit by the Coriolis force; an oscillation circuit connected to said excitation electrodes for both exciting said tuning fork vibration and for supplying a clock signal as output based on said tuning fork vibration; a detection circuit connected to said sensing electrodes for supplying an angular velocity signal in accordance with said electric charge, wherein said detection circuit starts operation in accordance with a standby signal to supply said angular velocity signal as output; an IC chip for integrating said oscillation circuit and said detection circuit as a single unit; and a surface-mount receptacle for accommodating said IC chip and said tuning fork crystal unit, wherein at least an output terminal for said clock signal, an input terminal for said standby signal, and an output terminal for said angular velocity signal are provided on the outer bottom surface of said surface-mount receptacle.