Patent ID: 7167061

Claim:
A tuning fork shaped crystal oscillator, wherein two tuning fork shaped crystal elements formed by wet etching during formation of the external shape of a tuning fork, in such a manner that the longitudinal direction of the tuning fork is aligned on the Y-axis of the crystalline axes (XYZ) and the lateral direction thereof is aligned on the X-axis, are bonded together with the ±X-axis directions thereof oriented in opposite directions, the right side surface of each of said two tuning fork shaped crystal elements being the +X face of the crystal when said two tuning fork shaped crystal elements are viewed in an upright orientation from each Z-axis direction, wherein two tine portions of the tuning fork extend out from a tuning-fork base portion, a handle portion of the tuning fork has a laterally symmetrical V-shaped groove having inclined portions, and said inclined portions of said V-shaped groove each have a ridge line along the center thereof and a sectional surface that forms a triangle.