Piezoelectric vibrating reed and piezoelectric vibrator
To provide a small-sized piezoelectric vibrating reed and a piezoelectric vibrator with excellent durability. The piezoelectric vibrating reed includes a piezoelectric plate having a rectangular shape, a vibrating portion formed on a principal surface of the piezoelectric plate and a pair of mount portions for mounting the piezoelectric plate. The pair of mount portions are formed at both end portions of the piezoelectric plate in a longitudinal direction. The piezoelectric vibrator includes the piezoelectric vibrating reed and a package on which the mount portions of the piezoelectric vibrating reed are mounted.
1. A piezoelectric vibrating reed comprising:
a piezoelectric plate having a rectangular shape, such that a longitudinal direction is greater than a short direction orthogonal to the longitudinal direction;
a vibrating portion on a principal surface of the piezoelectric plate; and
first and second mount portions integral with the piezoelectric plate and configured to mount the piezoelectric plate, the mount portions separated in the longitudinal direction,
wherein the first mount portion resides at a first end of the piezoelectric plate and the second mount portion resides at a second end of the piezoelectric plate in the longitudinal direction.
2. The piezoelectric vibrating reed according to claim 1 , wherein each of the first and second mount portions reside in the vicinity of corners at opposite ends of the piezoelectric plate in the longitudinal direction.
3. The piezoelectric vibrating reed according to claim 1 , wherein a thickness of the vibrating portion is less than a thickness of the first and second mount portions, at least in a region in proximity to the first and second mount portions.
4. The piezoelectric vibrating reed according to claim 1 , wherein the piezoelectric plate is an AT-cut quartz substrate, and the longitudinal direction of the piezoelectric plate extends along a Z′ axis direction of the AT-cut quartz substrate.
5. The piezoelectric vibrating reed according to claim 1 , wherein an external dimension of the piezoelectric plate along the longitudinal direction is at most 1.4 times an external dimension of the piezoelectric plate along a short direction orthogonal to the longitudinal direction.
6. The piezoelectric vibrating reed according to claim 1 , wherein the first and second mount portions protrude from the piezoelectric plate along a plane direction of the piezoelectric plate.
7. A piezoelectric vibrator comprising:
the piezoelectric vibrating reed according to claim 1 ; and
a package having the first and second mount portions of the piezoelectric vibrating reed bonded thereto.
8. The piezoelectric vibrator according to claim 7 , further comprising:
a mount member between the first and second mount portions of the piezoelectric vibrating reed and the package,
wherein the mount member contacts principal surfaces of the first and second mount portions and side surfaces of the mount portions.