Piezoelectric vibrator, oscillator, electronic apparatus and radio timepiece

摘要

A piezoelectric vibrator including a package having a base member, a lid member forming a cavity with respect to the base member, and a piezoelectric vibrating piece mounted on a mount surface and housed inside the cavity, in which the piezoelectric vibrating piece has a pair of vibrating arm portions and a base portion cantilever-supporting base end portions of the pair of vibrating arm portions and being mounted on the mount surface, a concave portion for avoiding contact with respect to tip portions when the vibrating arm portions are displaced in a thickness direction is formed on the mount surface, contact portions contacted by main surfaces of the vibrating arm portions facing the mount surface, and clearance portions for avoiding contact with at least one edge-line portion of two edge-line portions where the main surface intersects with two side surfaces.

主权项

1. A piezoelectric vibrator comprising:
a base member; a lid member bonded to the base member and defining a sealed cavity therebetween; and a piezoelectric vibrating piece having a pair of vibrating arms and a base mounted on a mount surface of the base member inside the cavity, the base integrally supporting base ends of the vibrating arms in a length direction, the vibrating arms having tip portions at free ends thereof and edge-line portions at corners thereof extending in the length direction, the base member including a concave portion in the mount surface facing the tip portions of the vibrating arms, the concave portion having an edge closer to the base ends than remaining edges of the concave portion and clearance portions in the edge proximate to the edge-line portions of the vibrating arms and extending in a direction toward the base ends.