Tuning fork-type crystal vibrator

摘要

A tuning fork-type crystal vibrator is provided that has improved CI and shock resistance. The tuning fork-type crystal vibrator includes a tuning fork-shaped crystal element made of a pair of tuning fork arms having grooves in their principal surfaces, and a tuning fork base portion from which the pair of tuning fork arms extends, an outer shape of the tuning fork-shaped crystal element being processed by etching. The tuning fork-type crystal vibrator has a protrusion, formed due to anisotropy of said etching, on a +X surface of the lateral faces of the tuning fork-shaped crystal element, and a first slanted portion rising from a -X direction in a +X direction formed in a tuning fork slit. A tip of the tuning fork slit on a principal surface side is shifted in +X direction from a center line bisecting the tuning fork-shaped crystal element in a width direction to a position at which tuning fork vibrations of the pair of tuning fork arms are balanced.