公开(公告)号：US11551661B2

公开(公告)日：2023-01-10

申请号：US16978879

申请日：2019-02-19

申请人： KOREA INSTITUTE OF MACHINERY & MATERIALS

发明人： Kyungjun Song ,  Shin Hur ,  Duck Gyu Lee ,  Eun Joong Lee

IPC分类号： G10K11/32 ,  G10K11/26 ,  G10K11/18 ,  G10K11/36

摘要： A directional sound apparatus includes a planar shape plate and a sound wave generator. The planar shape plate has a plurality of grooves formed on a surface of the planar shape plate. The sound wave generator is configured to radiate a sound wave to outside from the surface of the planar shape plate. A width of each of the grooves and a distance between the grooves adjacent to each other are smaller than a wavelength of the sound wave. The planar shape plate has a plurality of cell areas in which at least one groove is included. A structure of the groove included in a first cell area is different from that of the groove included in a second cell area adjacent to the first cell area, so that surface admittance in the first cell area is different from that in the second cell area.

公开(公告)号：US09959855B2

公开(公告)日：2018-05-01

申请号：US15121985

申请日：2014-07-28

申请人： KOREA INSTITUTE OF MACHINERY & MATERIALS

发明人： Kyungjun Song ,  Shin Hur ,  Youngdo Jung ,  Seong-Hyun Lee ,  Jedo Kim

IPC分类号： G10K11/08 ,  G10K11/22 ,  G10K11/26 ,  H04R1/34

CPC分类号： G10K11/08 ,  G10K11/22 ,  G10K11/26 ,  H04R1/345

摘要： A sound wave metamaterial amplifies a sound wave, and includes a plate. The plate has a plurality of sound wave guides passing through both surfaces of the plate and having a predetermined pattern. The sound wave guides are spaced apart from each other by a predetermined distance and face each other, with respect to a central point, a central axis or a central surface.