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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.
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2.发明公开公开(公告)号：US20240180039A1
公开(公告)日：2024-05-30
申请号：US18521287
申请日：2023-11-28
Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE
Inventor： Intae SEO , Hyung Won KANG , Seung Ho HAN
IPC: H10N30/053 , C22C9/06 , H10N30/067 , H10N30/50 , H10N30/87
CPC classification number: H10N30/053 , C22C9/06 , H10N30/067 , H10N30/50 , H10N30/871 , H10N30/877
Abstract: Disclosed is a method of manufacturing a multilayer piezoelectric element including internal electrodes, including providing a piezoelectric sheet including ceramic, forming internal electrodes on the piezoelectric sheet to create a piezoelectric sheet with internal electrodes formed thereon, stacking a plurality of piezoelectric sheets with internal electrodes formed thereon to create a piezoelectric stack, sintering the piezoelectric stack to create a sintered piezoelectric stack, and heat-treating the sintered piezoelectric stack in a reducing atmosphere, in which the internal electrodes are formed in an area ratio of 90% or more relative to the area of the piezoelectric sheet, thereby facilitating reduction of the internal electrodes even by reduction heat treatment at a relatively low temperature.
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公开(公告)号：US20230081954A1
公开(公告)日：2023-03-16
申请号：US17897502
申请日：2022-08-29
Applicant: Korea Electronics Technology Institute
Inventor： Intae SEO , Hyung Won KANG , Seung Ho HAN , Myong Jae YOO , Hyunseung YANG
IPC: H01L41/187 , H01L41/37 , H01L41/312 , H01L41/047 , H01L41/338 , H01L41/193
Abstract: Disclosed is a method for manufacturing a laminated piezoelectric composite. The method includes wet-mixing ceramic powder, a polymer binder, a plasticizer and a solvent for 4 to 72 hours so as to generate a mixed slurry, introducing the mixed slurry into a tape casting process so as to prepare a plurality of piezoelectric composite sheets, drying and forming the plurality of piezoelectric composite sheets using a roll-to-roll process so as to prepare the plurality of formed piezoelectric composite sheets, forming internal electrodes on the plurality of piezoelectric composite sheets so as to prepare the plurality of piezoelectric composite sheets having the internal electrodes, laminating and pressing the plurality of piezoelectric composite sheets having the internal electrodes so as to generate a piezoelectric composite sheet laminate having the internal electrodes, and cutting the piezoelectric composite sheet laminate having the internal electrodes into a desired shape and size.
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公开(公告)号：US20250065369A1
公开(公告)日：2025-02-27
申请号：US18804210
申请日：2024-08-14
Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE
Inventor： Hyung Won KANG , Seung Ho HAN , Intae SEO
IPC: B06B1/06
Abstract: A haptic actuator is disclosed. The haptic actuator includes a piezoelectric element formed of a piezoelectric material, and a drive electrode formed at the piezoelectric plate to have a smaller area than an area of the piezoelectric plate. The haptic actuator minimizes reduction of a maximum displacement of the piezoelectric plate, as compared to reduction of drive current amount.
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Patent Agency Ranking
公开(公告)号：US20220077381A1
公开(公告)日：2022-03-10
申请号：US17468404
申请日：2021-09-07
Applicant: Korea Electronics Technology Institute
Inventor： Myong Jae YOO , Hyung Won KANG , Seung Ho HAN
IPC: H01L41/332 , H01L41/047 , H01L41/187 , H01L41/29 , H01L41/43 , B23K26/352 , B23K26/0622 , B23K26/00
Abstract: A method of forming an electrode in a ceramic transducer electronic component is provided. The method includes preparing a sintered body for a ceramic transducer containing a metal oxide, performing patterning by irradiating a laser on a surface of the sintered body for a ceramic transducer, and forming a metal electrode by performing an electroless plating process on the sintered body for a ceramic transducer on which the patterning is formed, wherein, in the performing of the patterning by irradiating the laser on the surface of the sintered body for a ceramic transducer, the patterning is performed by irradiating the laser that satisfies at least one of a predetermined power condition and a predetermined processing speed condition.
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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
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.
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公开(公告)号：US20180053890A1
公开(公告)日：2018-02-22
申请号：US15663484
申请日：2017-07-28
Applicant: Korea Electronics Technology Institute
Inventor： Hyung Won KANG , Seung Ho HAN
CPC classification number: H01L41/12 , H01L41/00 , H01L41/08 , H01L41/1871 , H01L41/1873 , H01L41/1875 , H01L41/1878 , H01L41/20 , H01L41/22 , H02N2/188
Abstract: A magnetoelectric energy harvester having excellent power generation performance and a manufacturing method thereof are provided. The magnetoelectric energy harvester includes a magnetostrictive material portion including a magnetostrictive material which generates a mechanical deformation when being magnetized. The magnetoelectric energy harvester also includes a piezoelectric material portion which has a bending vibration mode and includes a piezoelectric material which produces power by receiving a mechanical deformation force from the magnetostrictive material portion.
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公开(公告)号：US20230232720A1
公开(公告)日：2023-07-20
申请号：US18098177
申请日：2023-01-18
Applicant: Korea Electronics Technology Institute
Inventor： Hyung Won KANG , Seung Ho HAN , Intae SEO
CPC classification number: H10N30/2023 , G06F3/016
Abstract: A haptic actuator is disclosed. The haptic actuator includes a polygonal piezoelectric element configured to generate a displacement thereof while expanding and contracting in accordance with polarities of a voltage applied thereto, and a jig member coupled to the piezoelectric element at upper and lower sides of the piezoelectric element in a thickness direction of the piezoelectric element in a state of contacting only corners of the piezoelectric element and configured to amplify the displacement generated at the piezoelectric element, thereby vibrating. The jig member amplifies the displacement generated at the piezoelectric element and, as such, vibrates. Accordingly, it is possible to provide excellent haptic effects with high resolution to the user, using even a small voltage.
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公开(公告)号：US20200091405A1
公开(公告)日：2020-03-19
申请号：US16189960
申请日：2018-11-13
Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE
Inventor： Seung Ho HAN , Hyung Won KANG
Abstract: A method of manufacturing a magnetoelectric composite material having a 0-3 type connectivity is provided. The manufacturing method includes manufacturing a slurry including an alignment material including one material selected from among a magnetostrictive material and a piezoelectric material. The slurry further comprises a seed composition comprising the other material from the magnetostrictive material and the piezoelectric material. The method further comprises molding the manufactured slurry to manufacture a molding material, and plasticizing and firing the molding material.
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