Patent ID: 8928208
Filing Date: 2015-01-06
Classification: H03H

Abstract:
1. A tuning fork-type piezoelectric resonator plate in which a piezoelectric resonator blank is constituted by a pair of leg portions serving as vibrating portions and a base portion from which the leg portions protrude, the pair of leg portions are arranged in parallel protrudingly from one end face of the base portion, and a pronged portion is formed between the pair of leg portions in an intermediate position in a width direction of the one end face of the base portion, the base portion has formed therein a pair of through holes along the one end face of the base portion, and has, on another end face side opposite to the one end face of the base portion, a joining region that joins to an external portion, the pair of through holes are formed in positions closer to a center line in the width direction of the base than to base end portions of the pair of leg portions, in a state where both of the through holes are not in contact with each other, and with the through holes, a plane area of the through holes progressively decreases in size toward an inner portion of the piezoelectric resonator blank from both end portions of the through holes in both back and front main surfaces of the piezoelectric resonator blank, and a wall surface of the through holes is formed in a spiral shape.