公开(公告)号：US20220393099A1

公开(公告)日：2022-12-08

申请号：US17739287

申请日：2022-05-09

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： In Tae SEO ,  Hyung Won KANG ,  Seung Ho HAN

IPC: H01L41/37 ,  C08J3/21 ,  C08J5/18 ,  C08J5/12 ,  C08K3/22 ,  C08K5/12 ,  H01L41/18 ,  H01L41/338

Abstract: Proposed is a method of manufacturing a piezoelectric composite material. The method includes the steps: wet mixing the ceramic powder, the polymer binder, the plasticizer, and the solvent for 4 to 72 hours to produce the mixed slurry, in which the amount of the polymer binder in the mixed slurry is 3 to 10 parts by weight, the amount of the plasticizer is 0.1 to 3 parts by weight, and the amount of the solvent is 30 or more to less than 50 parts by weight, based on 100 parts by weight of the ceramic powder in the mixed slurry; introducing the mixed slurry into a tape casting process to produce a piezoelectric composite sheet; drying and molding the piezoelectric composite sheet in a roll-to-roll process to form a molded piezoelectric composite sheet; laminating and compressing piezoelectric composite sheets molded to produce piezoelectric composite sheet laminates; and cutting the piezoelectric composite sheet laminate into the desired shape and size.

公开(公告)号：US20220216391A1

公开(公告)日：2022-07-07

申请号：US17567676

申请日：2022-01-03

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Hyung Won KANG ,  Seung Ho HAN ,  In Tae SEO

IPC: H01L41/047 ,  H01L41/083 ,  H01L41/09

Abstract: A stack-type piezoelectric element is implemented with a reduced capacitance value without a reduction in displacement amount. The stack-type piezoelectric element includes a piezoelectric layer formed of a piezoelectric material, and electrode layers formed in and on the piezoelectric layer and including at least one internal electrode layer formed inside the piezoelectric layer. Each of the at least one internal electrode layer includes a plurality of split electrodes that are separated and arranged in a longitudinal direction. A piezoelectric actuator including the stack-type piezoelectric element is also provided.