Patent ID: 9584094
Date: 2017-02-28
CPC Classifications: H01L,H03H

Claim:
1. A piezoelectric vibrating reed comprising: vibrating arms extending along a first direction; a base fixing a pair of vibrating arms, wherein the pair of vibrating arms reside side by side in a second direction crossing the first direction, base-ends of which in the first direction are fixed to the base, and tip-ends of which in the first direction are free to vibrate, inclined surfaces in sides of the base-ends of the vibrating arms in the second direction such that a width of the vibrating arms in the second direction gradually increases from the tip ends toward the base-ends, wherein end portions of the base-ends have an inner inclined surface in an inner side of the inclined surfaces in the second direction that are connected to an end surface of the base, and end portions of the base-ends have an outer inclined surface in an outer side of the inclined surfaces in the second direction that are connected to the end surface of the base in the second direction, and the portions of the base-ends of the outer inclined surface are closer to the tip-ends than the portions of the base-ends of the inner inclined surface; and groove portions on front and back surfaces of the vibrating arms that extend in the first direction, wherein the outer inclined surfaces terminate at an inflection point joining parallel surfaces that extend in the first direction and join the base, such that a distance in the second direction between the groove portions and over an entire length of the parallel surfaces is constant.