Patent ID: 6915548

Claim:
A method for manufacturing a quartz crystal unit, comprising the steps of: forming a quartz crystal tuning fork resonator capable of vibrating in a flexural mode by etching a quartz crystal wafer in a first etching process to form a quartz crystal tuning fork base and a plurality of quartz crystal tuning fork tines connected to the quartz crystal tuning fork base, etching the quartz crystal wafer in a second etching process different from the first etching process to form a groove having stepped portions in at least one of opposite main surfaces of each of the quartz crystal tuning fork tines, disposing a plurality of first electrodes having a first electrical polarity on the stepped portions of the grooves of respective ones of the quartz crystal tuning fork tines, and disposing a plurality of second electrodes having a second electrical polarity on side surfaces of respective ones of the quartz crystal tuning fork tines, the second electrical polarity being opposite to the first electrical polarity; providing a case having an interior space and an open end communicating with the interior space; providing a lid for covering the open end of the case; mounting the quartz crystal tuning fork resonator in the interior space of the case; and connecting the lid to the case to cover the open end thereof.