Piezoelectric vibration reed, piezoelectric vibrator, oscillator, electronic instrument, and radio timepiece

摘要

A piezoelectric vibration reed includes a pair of vibrating arm portions arranged in parallel to each other and a base portion. The base portion is integrally coupled to proximal ends of the pair of the vibrating arm portions in a longitudinal direction that the vibrating arm portions extend. The base portion includes a connecting portion, a mount portion, and a narrow portion between the connecting portion and the mount portion. The base portion further includes a pair of notched portions notched respectively inwardly from both sides of the base portion in the width direction and ribs projecting outwardly in the width direction of the base portion and arranged in the interiors of the notched portions.

主权项

1. A piezoelectric vibration reed, comprising:
a pair of vibrating arm portions arranged in parallel to each other; and a base portion integrally coupled to proximal ends of the pair of the vibrating arm portions in a longitudinal direction that the vibrating arm portions extend, wherein the base portion includes:
a connecting portion which is located on a distal end side of the base portion along the longitudinal direction and to which the proximal end of the vibrating arm portions are coupled; anda mount portion located on a proximal end of the base portion along the longitudinal direction for mounting the base portion;a narrow portion between the connecting portion and the mount portion, the narrow portion having a length narrower than a length of the connecting portion and a length of the mount portion in a width direction of the piezoelectric vibration reed which is perpendicular to the longitudinal direction;a pair of notched portions notched respectively inwardly from both sides of the base portion in the width direction to form the narrow portion; andribs projecting outwardly in the width direction of the base portion and arranged in the interiors of the notched portions wherein the pair of notched portions accommodate the ribs such that outside end portions of the ribs in the width direction of the piezoelectric vibration reed are located inside the connecting portion and the mount portion;wherein a combined length of the narrow portion and the ribs is narrower than the length of the connection portion and the length of the mount portion in the width direction of the piezoelectric vibration reed.