Patent ID: 8020264
Filing Date: 2011-09-20
Classification: H03H,Y10T

Abstract:
1. A method for producing piezoelectric vibrators, comprising: (a) defining a plurality of first substrates on a first wafer and a plurality of second substrates on a second wafer; (b) forming a pair of through-holes in respective at least some of the first substrates on the first wafer, wherein the pair of through-holes are formed in a contact area defined along a periphery of the first substrate; (c) patterning, on respective at least some of the through-holed first substrates on the first wafer, a conductive layer which comprises a conductive loop extensive within the contact area to surround only one of the through-holes, and a first and a second electrodes formed inside the conductive loop in electrical connection with the conductive loop, the second electrode being electrically connected to the conductive loop via a bridge and extensive to surround only the other of the through-holes; (d) layering the first and second wafers such that at least some of the first substrates substantially coincide respectively with at least some of the corresponding second substrates, with a piezoelectric vibrating strip being secured in respective at least some of the coinciding first and second substrate pairs, wherein the coinciding first and second substrates are layered in contact with each other over the contact area; (e) anodically bonding a respective at least some of the coinciding first and second substrate pairs which each include the conductive layer patterned therein, wherein the conductive layer functions as a bonding layer for bonding the first and second substrate together so that the pair of through-holes formed in the first substrate are air-tightly closed by the second substrate; (f) after step (e), cutting the bridge in respective at least some of the bonded first and second substrate pairs to electrically isolate the second electrode from the conductive loop; and (g) after step (f), cutting off from the first and second wafers a respective at least some of the bonded first and second substrate pairs whose bridge is cut.