Title:
音響デバイス
Document Type and Number:
Japanese Patent JP6625118
Kind Code:
B2
Abstract:
Provided acoustic devices include an external housing defining an expansion chamber and a wall extending through and partitioning the expansion chamber into a central chamber and a peripheral chamber adjacent the central chamber, wherein an inlet and outlet communicate with the central chamber, and wherein the wall includes a plurality of apertures formed therethrough to allow air movement to and from the central and expansion chambers, the plurality of apertures sized to provide an average flow resistance ranging from 100 MKS Rayls to 5000 MKS Rayls. The acoustic devices advantageously show significant sound attenuation while streamlining air flow to reduce pressure drop across the expansion chamber.
Inventors:
Hanshen, Thomas P.
Alexander, Jonathan H.
Martinson, Paul A.
Bolton, John Stuart
Lee, Sunkyu
Hartle, Thomas
Gerdes, Ronald W..
Alexander, Jonathan H.
Martinson, Paul A.
Bolton, John Stuart
Lee, Sunkyu
Hartle, Thomas
Gerdes, Ronald W..
Application Number:
JP2017513173A
Publication Date:
December 25, 2019
Filing Date:
September 09, 2015
Export Citation:
Assignee:
3M INNOVATIVE PROPERTIES COMPANY
International Classes:
F01N1/02; G10K11/16
Domestic Patent References:
| JP3089920U | ||||
| JP50127031A | ||||
| JP2005352188A | ||||
| JP39015739Y1 | ||||
| JP45012291Y1 |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Ikeda adult
Yoshinori Shimizu
Junichiro Sakamaki
Ikeda adult
Yoshinori Shimizu
Junichiro Sakamaki