Method for manufacturing quartz crystal unit and electronic apparatus having quartz crystal unit

摘要

In a method for manufacturing a quartz crystal unit and an electronic apparatus having the quartz crystal unit, each of the quartz crystal unit and the electronic apparatus having the quartz crystal unit, comprising the steps of forming a quartz crystal tuning fork resonator capable of vibrating in a flexural mode of an inverse phase, and having first and second quartz crystal tuning fork tines by etching a quartz crystal wafer; disposing an electrode on each of two of side surfaces of each of the first and second quartz crystal tuning fork tines so that the electrodes on the side surfaces of the first quartz crystal tuning fork tine have an electrical polarity opposite to an electrical polarity of the electrodes on the 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 thereof, the quartz crystal unit comprising the quartz crystal tuning fork resonator with a piezoelectric constant e'₁₂ within a range of 0.12 C/m² to 0.19 C/m² in the absolute value.