Ultrasonic transmission structure
AssigneesCenter for Advanced Meta-Materials, Pusan National University Industry-University Cooperation Foundation
InventorsJong Jin Park, Jun Hyuk Kwak, Kyung Jun Song, Hak Joo Lee
Life of this patent
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Abstract
Disclosed is an ultrasonic wave transmission structure which is provided on a path of ultrasonic waves to amplify incident ultrasonic waves. The ultrasonic wave transmission structure includes: 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; and a membrane disposed in the multiple rings, wherein the mass of the membrane is adjusted to vary a resonant frequency in multiple sub-membrane regions.
Claims16
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.
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 decreasing portion formed in a membrane region adjoining the slit to decrease 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 decreasing portion.
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;
- and
- a membrane disposed in the multiple rings,
- wherein a membrane region adjoining the slit is divided into multiple sub-membrane regions depending upon a distance from a center of the multiple rings and a resonant frequency in the sub-membrane regions is changed by changing thicknesses of the sub-membrane regions depending upon the distance from the center of the multiple rings.
Dependencies are inferred from the claim text.