Method of manufacturing a piezoelectric resonator

A method of manufacturing a piezoelectric resonator comprising the steps of:

• providing a piezoelectric mother substrate having a pair of main surfaces;
• forming electrodes on the pair of the main surfaces of the piezoelectric mother substrate;
• dividing at least one of the electrodes to form a plurality of divided electrodes by forming a plurality of grooves on one of the pair of main surfaces of the piezoelectric mother substrate, only one of the plurality of divided electrodes defining an input/output electrode, the remainder of the plurality of divided electrodes defining disconnected lines such that the remainder of the plurality of divided electrodes do not function as electrodes of the piezoelectric resonator;
• and
• dividing the piezoelectric mother substrate to form an individual piezoelectric resonator including an individual piezoelectric substrate such that a length of a maximum distance between the outer edges of two of the grooves disposed opposite to each other across the input/output electrode is about 0.50 to about 0.55 times a length of one side edge of the individual piezoelectric substrate is about 0.50 to about 0.55 times the length of a maximum distance between the outer edges of two of the grooves disposed opposite to each other across the input/output electrode;
• wherein
• the individual piezoelectric resonator including the individual piezoelectric substrate, said plurality of electrodes, and said plurality of grooves is configured to vibrate in a square vibration mode.