Patent ID: 8148875

Claim:
A piezoelectric vibrator comprising: a hermetically closed casing comprising first and second substrates with a cavity therebetween, which are anodically bonded together; a piezoelectric vibrating strip having a proximal end and distal end and secured inside the cavity; a first layer applied at a substantially uniform thickness to cover the piezoelectric vibrating strip, the first layer being made of a material having a gettering characteristic, wherein the first layer constitutes an adjustable weight in a first section of the piezoelectric vibrating strip located close to the distal end, driving electrodes in a second section thereof located between the first section and the proximal end and mount electrodes in a third section thereof located close to the proximal end between the second section and the proximal end; a second layer applied on the first layer at a substantially uniform thickness in the first and third sections so as to expose the first layer in part in the first section and at least in part in the second section, wherein the second layer constitutes an adjustable weight in the first section and mount electrodes in the third section; and an insulation layer applied to at least partially cover the second section so as to expose the second layer at least in part in the third section and expose both the first and second layers at least in part in the first section such that the first layer is directly irradiatable in the first section with a laser from the outside of the casing.