Patent ID: 11871671
Assignee: NGK INSULATORS, LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of producing a bonded body of a piezoelectric material substrate and a supporting substrate with a silicon oxide layer provided thereon, said piezoelectric material substrate comprising a material selected from the group consisting of lithium niobate, lithium tantalate and lithium niobate-lithium tantalate, the method comprising the steps of:
irradiating an oxygen plasma onto a bonding surface of said piezoelectric material substrate at a temperature of 150° C. or lower to make a surface resistivity at said bonding surface 1.7×1015Ω/□ or higher; and
then bonding said bonding surface of said piezoelectric material substrate to a bonding surface of said silicon oxide layer.