Patent ID: 8096042
Filing Date: 2012-01-17
Classification: H03B,H03H,H04R,Y10T

Abstract:
1. 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 of an inverse phase and having a quartz crystal tuning fork shape, a capacitance ratio r forming at least one groove having a dimension in at least one of the opposite main surfaces of each of the first and second quartz crystal tuning fork tines so that a spaced-apart distance between the first and second quartz crystal tuning fork tines is greater than or equal to a width 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; determining the dimension of each of the quartz crystal tuning fork shape and 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 so that the capacitance ratio r providing a case having a mounting portion and a lid for covering an open end of the case; mounting the quartz crystal tuning fork resonator on the mounting portion of the case; and connecting the lid to the case to cover the open end of the case.