A piezoelectric resonant part includes a piezoelectric substrate having first and second opposed main surfaces, electrode patterns formed on the main surfaces; and protective substrates bonded to respective ones of the main surfaces of the piezoelectric substrate via adhesive layers to form a laminate....http://www.google.es/patents/US6134762?utm_source=gb-gplus-sharePatente US6134762 - Piezoelectric resonant part and method of manufacturing the same
Piezoelectric resonant part and method of manufacturing the same
