Patent ID: 8987978
Filing Date: 2015-03-24
Classification: G04C,G04R,H01L,H03H

Abstract:
1. A tuning-fork type piezoelectric vibrating piece comprising: a pair of vibrating arms parallel to each other; a base portion integrally fixing base ends of the pair of vibrating arms in a length direction; and groove portions in main surfaces of the pair of vibrating arms and extending along the length direction, wherein a thickness direction of the vibrating arms is aligned with a Z axis direction of a crystal axes, the length direction of the vibrating arms is aligned with a Y axis direction of the crystal axes and a width direction is aligned with an X axis direction of the crystal axes and orthogonal to the length direction and the thickness direction, and wherein each of the groove portions includes a first groove portion proximate to a tip end of the vibrating arms and a second groove portion proximate to the base ends of the vibrating arms relative to the first groove portion, a centerline in the Y axis direction of the second groove portion is offset along the X axis direction with respect to a centerline in the Y axis direction of the first groove portion, and a groove width in the width direction of the second groove portion is narrower than a groove width of the first groove portion.