Patent ID: 6912760

Claim:
A method for manufacturing thin film piezoelectric elements, comprising: sequentially laminating a first lower electrode layer, a first piezoelectric thin film, and a first upper electrode layer on a first substrate; sequentially laminating a second lover electrode layer, a second piezoelectric thin film, and a second upper electrode layer on a second substrate; bonding said first upper electrode layer and said second upper electrode layer in opposed relation to each other with an adhesive layer therebetween; selectively removing only said second substrate; processing said first lower electrode layer, said first piezoelectric thin film, said first upper electrode layer, said second lower electrode layer, said second piezoelectric thin film, said second upper electrode layer, and said adhesive layer into specified shapes respectively or all together, thereby forming a plurality of separated structures; covering each of said plurality of structures with an insulating layer, forming external connecting electrodes for connecting said first upper electrode layer, said first lower electrode layer, said second upper electrode layer, and said second lower electrode layer to external equipment, thereby making a plurality of piezoelectric elements; covering said plurality of piezoelectric elements with a resin layer, and further bonding a temporary fixing substrate thereto; selectively removing only said first substrate; and lowering the adhesion of the adhesive layer used for bonding said temporary fixing substrate, or dissolving said adhesive layer to separate said temporary fixing substrate, and also removing said resin layer from said piezoelectric element surface to individually separate said plurality of piezoelectric elements.