Title:
HOLLOW STRUCTURE AND RESONANCE NOISE REDUCTION BODY
Document Type and Number:
WIPO Patent Application WO/2020/157907
Kind Code:
A1
Abstract:
This hollow structure has: a hollow body that has an annular first space formed therein; and one or more resonators that each have formed therein an elongated second space which has a pair of openings opening into the first space at each end. The ratio of the length of the center line in the second space to the length of the center line in the first space is within the range of 0.45-0.55, and the second space has a bent or curved portion.
Inventors:
HONJI YOSHIKAZU (JP)
YOSHIDA AZUMI (JP)
YOSHIDA AZUMI (JP)
Application Number:
PCT/JP2019/003368
Publication Date:
August 06, 2020
Filing Date:
January 31, 2019
Export Citation:
Assignee:
YAMAHA CORP (JP)
International Classes:
B60B21/02; B60B21/12; G10K11/172
Domestic Patent References:
| WO2014097363A1 | 2014-06-26 |
Foreign References:
| JP2015171876A | 2015-10-01 | |||
| JP2015145181A | 2015-08-13 | |||
| JP2005205934A | 2005-08-04 | |||
| JP2018012499A | 2018-01-25 | |||
| US20160059624A1 | 2016-03-03 | |||
| JP2008030505A | 2008-02-14 |
Other References:
See also references of EP 3795371A4
Attorney, Agent or Firm:
OHBAYASHI, Akira et al. (JP)
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