Title:
HOLOGRAPHIC-BASED DIRECTIONAL SOUND DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/080196
Kind Code:
A1
Abstract:
The present invention relates to a holographic-based directional sound device that makes a sound wave generated by a sound wave generating means have directivity such that the sound wave is radiated in a specific direction. The technical gist of the present invention is the holographic-based directional sound device comprising: a sound wave generating means which generates a sound wave; and a flat plate which has the sound wave generating means installed at the center thereof so as to radiate the sound wave to the outside through a surface thereof, and is composed of a plurality of unit cells, and in which at least one groove is formed on surfaces of the unit cells, and a radiation angle of the sound wave is determined according to the depth of the groove with respect to a unit cell, wherein the depth of the groove with respect to the unit cell is determined by an individual surface admittance calculated on the basis of a cosine function or a sine function of the sum of a first value and a second value, the first value being obtained by multiplying, on the basis of a preset radiation angle of the sound wave and a preset frequency of the sound wave, the frequency of the sound wave by a refractive index according to a surface of the unit cell and a radial distance from the center of the flat plate to the unit cell, and the second value being obtained by multiplying the frequency of the sound wave by a position value of the unit cells and the radiation angle of the sound wave.
Inventors:
SONG KYUNG JUN (KR)
LEE HAK JOO (KR)
KWAK JUN HYUK (KR)
PARK JONG JIN (KR)
LEE HAK JOO (KR)
KWAK JUN HYUK (KR)
PARK JONG JIN (KR)
Application Number:
PCT/KR2020/012899
Publication Date:
April 29, 2021
Filing Date:
September 23, 2020
Export Citation:
Assignee:
NAT UNIV PUSAN IND UNIV COOP FOUND (KR)
CT ADVANCED META MAT (KR)
CT ADVANCED META MAT (KR)
International Classes:
H04R1/32; G03H1/02; H04R1/34
Foreign References:
| KR101975022B1 | 2019-05-03 | |||
| KR101574794B1 | 2015-12-04 | |||
| KR20130033723A | 2013-04-04 | |||
| KR20130116373A | 2013-10-23 | |||
| KR20160012838A | 2016-02-03 | |||
| KR102151358B1 | 2020-09-02 |
Attorney, Agent or Firm:
JUN, Yong Cheul (KR)
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