Patent ID: 7863803

Claim:
A tuning fork resonator element having a base portion, first and second resonating arms extending from the base portion in a first direction along and substantially parallel to a longitudinal axis of each of the first and second resonating arms, and a support frame sandwiching the first and second resonating arms and being connected to the base portion, the tuning fork resonator element comprising: a first excitation electrode formed in an area close to a connection portion with the base portion and the support frame, the first excitation electrode being connected to a mount electrode with a conductive adhesive; a second excitation electrode formed in an area sandwiching the first and second resonating arms of the support frame and in an area positioned farther than the first and second resonating arms in the first direction, the second excitation electrode being connected to a mount electrode with the conductive adhesive; a pair of cut portions of the support frame formed on side surfaces of the support frame that are opposite to surfaces of the support frame opposing respective ones of the first and second resonating arms, the pair of cut portions being disposed along a length of the support frame between the base portion and a distal end of the support frame; a cut portion of the base portion formed on both sides of the base portion in a width direction of the base portion; and a fin made by anisotropic etching is formed in the cut portion of the base portion to disconnect the first excitation electrode and the second excitation electrode; wherein the first and second excitation electrodes each extend through electrode films on a front surface and a back surface of the base portion to the resonating arm; and wherein the electrode films on the front surface and the back surface of the base portion are connected through an electrode film of a side surface of the base portion, the electrode film on the side surface of the base portion being cut in the cut portion of the base portion.