Title:
ULTRASONIC SENSOR
Document Type and Number:
WIPO Patent Application WO/2021/176954
Kind Code:
A1
Abstract:
The present invention is for obtaining an ultrasonic sensor that is less affected by a change in humidity. An ultrasonic sensor (1) is formed by laminating a piezoelectric element (2), a metal housing (3), a first acoustic matching layer (4), and a second acoustic matching layer (5) in this order. The first acoustic matching layer (4) adjacent to the piezoelectric element (2) with the metal housing (3) interposed therebetween is composed of a thermoplastic resin and an inorganic filler. The weight fraction of the inorganic filler in the first acoustic matching layer (4) is set to 30% or less, and the weight fraction of a hollow structure filler in the inorganic filler is set to 50% or less.
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Inventors:
MASUDA TOMOKI
ISHIZAKI YUDAI
NAGAHARA HIDETOMO
ISHIZAKI YUDAI
NAGAHARA HIDETOMO
Application Number:
PCT/JP2021/004507
Publication Date:
September 10, 2021
Filing Date:
February 08, 2021
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
H04R17/00
Foreign References:
| JP2020017831A | 2020-01-30 | |||
| JP3219041U | 2018-11-22 | |||
| JP2005130389A | 2005-05-19 | |||
| JP2003259491A | 2003-09-12 |
Other References:
See also references of EP 4117307A4
Attorney, Agent or Firm:
KAMATA Kenji et al. (JP)
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