US 11,980,915 B2
Ultrasonic transmission structure
Jong Jin Park, Sejong-si (KR); Jun Hyuk Kwak, Sejong-si (KR); Kyung Jun Song, Busan (KR); and Hak Joo Lee, Daejeon (KR)
Assigned to CENTER FOR ADVANCED META-MATERIALS, Daejeon (KR); and PUSAN NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION, Busan (KR)
Filed by CENTER FOR ADVANCED META-MATERIALS, Daejeon (KR); and PUSAN NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION, Busan (KR)
Filed on May 11, 2022, as Appl. No. 17/741,515.
Application 17/741,515 is a continuation of application No. PCT/KR2019/015302, filed on Nov. 12, 2019.
Claims priority of application No. 10-2019-0143826 (KR), filed on Nov. 11, 2019.
Prior Publication US 2022/0266300 A1, Aug. 25, 2022
Int. Cl. B06B 3/02 (2006.01); B06B 3/04 (2006.01)
CPC B06B 3/02 (2013.01) [B06B 3/04 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An ultrasonic wave transmission structure adapted to radiate an ultrasonic wave through amplification of an incident ultrasonic wave, the ultrasonic wave transmission structure comprising:
multiple rings each provided with a body portion having a different radius from other body portions and spaced apart from another body portion adjacent thereto and a slit disposed between adjacent body portions;
a membrane disposed in the multiple rings; and
a mass increasing portion coupled to a membrane region adjoining the slit to increase a mass of the membrane,
wherein a resonant frequency of the membrane is changed by changing a total mass of the membrane and the mass increasing portion.