公开(公告)号：US20230232720A1

公开(公告)日：2023-07-20

申请号：US18098177

申请日：2023-01-18

申请人： Korea Electronics Technology Institute

发明人： Hyung Won KANG ,  Seung Ho HAN ,  Intae SEO

IPC分类号： H10N30/20 ,  G06F3/01

CPC分类号： H10N30/2023 ,  G06F3/016

摘要： 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.

公开(公告)号：US20240180039A1

公开(公告)日：2024-05-30

申请号：US18521287

申请日：2023-11-28

申请人： KOREA ELECTRONICS TECHNOLOGY INSTITUTE

发明人： Intae SEO ,  Hyung Won KANG ,  Seung Ho HAN

IPC分类号： H10N30/053 ,  C22C9/06 ,  H10N30/067 ,  H10N30/50 ,  H10N30/87

CPC分类号： H10N30/053 ,  C22C9/06 ,  H10N30/067 ,  H10N30/50 ,  H10N30/871 ,  H10N30/877

摘要： 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.

公开(公告)号：US20230081954A1

公开(公告)日：2023-03-16

申请号：US17897502

申请日：2022-08-29

申请人： Korea Electronics Technology Institute

发明人： Intae SEO ,  Hyung Won KANG ,  Seung Ho HAN ,  Myong Jae YOO ,  Hyunseung YANG

IPC分类号： H01L41/187 ,  H01L41/37 ,  H01L41/312 ,  H01L41/047 ,  H01L41/338 ,  H01L41/193

摘要： 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.