Patent ID: 8240023

Claim:
A method for manufacturing a quartz crystal unit, comprising the steps of: forming a quartz crystal tuning fork resonator vibratable in a flexural mode of an inverse phase and having a quartz crystal tuning fork base, and first and second quartz crystal tuning fork tines connected to the quartz crystal tuning fork base, each of the first and second quartz crystal tuning fork tines having opposite main surfaces and opposite side surfaces; forming at least one groove in at least one of the opposite main surfaces of each of the first and second quartz crystal tuning fork tines, a surface of the at least one groove being opposite one of the opposite side surfaces; disposing an electrode on the surface of the at least one groove formed in the at least one of the opposite main surfaces of each of the first and second quartz crystal tuning fork tines and an electrode on one of the opposite side surfaces of each of the first and second quartz crystal tuning fork tines so that the electrode disposed on the surface of the at least one groove formed in the at least one of the opposite main surfaces of the first quartz crystal tuning fork tine has an of the opposite side surfaces of the first quartz crystal tuning fork tine and the electrode disposed on the surface of the at least one groove formed in the at least one of the opposite main surfaces of the second quartz crystal tuning fork tine has an electrical polarity opposite to an electrical polarity of the electrode disposed on one of the opposite side surfaces of the second quartz crystal tuning fork tine; mounting the quartz crystal tuning fork resonator on a mounting portion of a case; and connecting a lid to the case to cover an open end of the case; wherein the step of forming the quartz crystal tuning fork base, and the first and second quartz crystal tuning fork tines is performed before the step of forming the at least one groove.