Title:
ULTRASOUND SENSOR
Document Type and Number:
WIPO Patent Application WO/2020/153099
Kind Code:
A1
Abstract:
In the present invention, a filler (130) fills the inside of a case (110) and covers a piezoelectric element (120). The filler (130) is made of a foamable resin. An inner surface (113) of the case (110) includes a first region (114) and a second region (115), which have mutually different surface roughnesses. The surface roughness of the first region (114) is greater than that of the second region (115). The first region (114) is located in a portion of a peripheral wall (112) opposing the piezoelectric element (120) and at least a portion of a bottom (111). The second region (115) is located in a section of the peripheral wall (112) which is farther away from the piezoelectric element (120) than the first region (114). The filler (130) is in contact with the first region (114) and the second region (115).
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JPS62200998 | PARAMETRIC SPEAKER |
Inventors:
MATSUSHITA TOMOAKI (JP)
EBARA KAZUHIRO (JP)
EBARA KAZUHIRO (JP)
Application Number:
PCT/JP2019/051198
Publication Date:
July 30, 2020
Filing Date:
December 26, 2019
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H04R17/00; G01S7/521
Domestic Patent References:
WO2016104415A1 | 2016-06-30 |
Foreign References:
JP2000023289A | 2000-01-21 | |||
JPH11266498A | 1999-09-28 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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