Patent ID: 7294951

Claim:
A method for manufacturing piezoelectric vibrators, comprising the steps of: integrally forming on a first wafer a plurality of vibrator pieces and frames so that the frames are connected to one end of and surround the respective vibrator pieces; forming first recessed portions on a bonding surface side of a second wafer; forming second recessed portions on a bonding surface side of a third wafer; forming a plurality of grooves having a V-shaped cross section in a non-bonding surface side of at least one of the second wafer and the third wafer at preselected positions; anodically bonding the first wafer, the second wafer and the third wafer in overlapping relation relative one another so that the first wafer is interposed between the bonding surface side of the second wafer and the bonding surface side of the third wafer; and cutting the overlapped first, second and third wafers at preselected positions to form the piezoelectric vibrators.