Patent ID: 7536768
Filing Date: 2009-05-26
Classification: H03B,H03H,H04R,Y10T

Abstract:
1. A method for manufacturing a quartz crystal unit, comprising the steps of: forming at least triple and in different steps a quartz crystal tuning fork resonator having a frequency of oscillation of a fundamental mode of vibration, the quartz crystal tuning fork resonator having a quartz crystal tuning fork base and first and second quartz crystal tuning fork tines each connected to the quartz crystal tuning fork base, each of the first and second quartz crystal tuning fork tines having a first main surface and a second main surface opposite the first main surface, and a first side surface and a second side surface opposite the first side surface; providing a case having a mounting portion and an open end; providing a lid for covering the 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 thereof; wherein the quartz crystal tuning fork resonator has a frequency of oscillation of a second overtone mode of vibration; and wherein the quartz crystal unit comprises the quartz crystal tuning fork resonator having a series resistance R