Patent ID: 6903618
Filing Date: 2005-06-07
Classification: H03H,Y10T

Abstract:
1. A quartz crystal unit comprising: a quartz crystal tuning fork resonator capable of vibrating in a flexural mode of an inverse phase and having a fundamental mode of vibration, a second overtone mode of vibration, a quartz crystal tuning fork base, and a plurality of quartz crystal tuning fork tines connected to the quartz crystal tuning fork base, each of the quartz crystal tuning fork tines having a first main surface, a second main surface opposite the first main surface, and at least one groove having stepped portions formed in at least one of the first and second main surfaces; a case having an interior space for housing the quartz crystal tuning fork resonator and an open end communicating with the interior space; and a lid for covering the open end of the case; wherein a merit value M