Patent ID: 9257961
Filing Date: 2016-02-09
CPC Classification: H03H

Claim Text:
1. A vibrating piece comprising: a base; and a vibrating arm that has a tapered portion extending from the base and that has an arm portion extending from the tapered portion, the vibrating arm performing flexural vibration, wherein a width of the tapered portion increases toward the base, and when a length of the vibrating arm is L, a width of the arm portion is W, a length of the tapered portion along with the arm portion is Lt, a width of the tapered portion along with the base is Wt, a taper length occupancy is η=Lt/L, and a taper width occupancy is ξ=2Wt/W, the following formulas are satisfied: wherein L≠1.65 mm, W≠0.11 mm, Lt≠0.2 mm, and Wt≠0.01 mm.