Patent ID: 7859172
Filing Date: 2010-12-28
Classification: H03H,Y10T

Abstract:
1. A piezoelectric resonator, comprising: a piezoelectric resonator element having a resonating arm and a metal film that is formed on the resonating arm; a package including a bottom part on which the piezoelectric resonator element is fixed and a frame wall that surrounds the bottom part, and having an opening above the bottom part; and a lid including a frame in which a through hole is provided and an optically transparent part that has an upper face and a lower face and is disposed at the through hole, the through hole penetrating a front face and a back face of the frame, the lower face of the optically transparent part being disposed so as to oppose the metal film, and the lid closing the opening of the package such that the lid overlaps with the bottom part and the frame wall, the through hole having a curved inner wall face whose curved face is coupled with at least one of the front face and the back face at at least one opening edge of the front face and the back face and a vertical inner wall face that is disposed substantially perpendicular to the front face and the back face and in a part of a thickness direction of the frame, the optically transparent part in contact with the vertical inner wall face and the curved inner wall face, including a first width at the curved inner wall face that is greater than a second width at the vertical inner wall face.