Patent ID: 8390176
Filing Date: 2013-03-05
Classification: H03H

Abstract:
1. A method of manufacturing a stacked crystal resonator, comprising the steps of: etching a first wafer made of crystal to form, a framed crystal plate in which a resonating section is surrounded by a frame section and said resonating section is connected to said frame section by a connecting section, and a first support section which connects said framed crystal plate to said first wafer, wherein said first support section is defined by at least one cutout portion provided in the first wafer; etching a second wafer to form, a cover to be bonded in a later step to a main surface of said frame section, and a second support section which connects said cover to said second wafer, wherein said second support section is defined by at least one cutout portion provided in the second wafer; etching a third wafer to form, a base to be bonded in a later step to another main surface of said frame section, and a third support section which connects said base to said third wafer, wherein said third support section is defined by at least one cutout portion provided in the third wafer; superposing said second wafer and third wafer onto the two main surfaces of said first wafer and bonding said cover and base to the two main surfaces of said frame section in said framed crystal plate so as to seal-enclose said resonating section, thereby forming a stacked crystal resonator connected to said first wafer, said second wafer and said third wafer by said first support section, said second support section and said third support section; and breaking out the stacked crystal resonators connected to said first wafer, said second wafer and said third wafer into individual pieces; wherein a thickness of at least one of said first support section, said second support section and said third support section is thinner than a thickness of a connection section connecting said framed crystal plate, said cover, or said base to said first support section, said second support section or said third support section.