US 12,125,464 B2
Assembly including acoustic baffles
Ronald W. Gerdes, St. Paul, MN (US); Catherine A. Leatherdale, Woodbury, MN (US); Thomas Herdtle, Inver Grove Heights, MN (US); Paul A. Nielsen, LaGrange, GA (US); Timothy J. Rowell, St. Paul, MN (US); Liyun Ren, Woodbury, MN (US); Daniel J. Zillig, Woodbury, MN (US); Sachin Talwar, Woodbury, MN (US); Eumi Pyun, St. Paul, MN (US); Jeffrey A. Chambers, Minneapolis, MN (US); and Pingfan Wu, Woodbury, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/633,851
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Aug. 28, 2020, PCT No. PCT/IB2020/058055
§ 371(c)(1), (2) Date Feb. 8, 2022,
PCT Pub. No. WO2021/044272, PCT Pub. Date Mar. 11, 2021.
Claims priority of provisional application 62/895,317, filed on Sep. 3, 2019.
Prior Publication US 2022/0366887 A1, Nov. 17, 2022
Int. Cl. F24F 13/24 (2006.01); G10K 11/16 (2006.01); G10K 11/168 (2006.01); G11B 33/08 (2006.01)
CPC G10K 11/168 (2013.01) 18 Claims
OG exemplary drawing
 
1. An assembly comprising:
an enclosure comprising first and second regions spaced apart along a first direction; and
a plurality of spaced apart acoustic baffles arranged along a second direction different from the first direction and disposed in the enclosure between the first and second regions, the plurality of spaced apart acoustic baffles comprising adjacent first and second acoustic baffles, each of the first and second acoustic baffles comprising a first acoustically absorptive layer disposed on a first sheet having a specific airflow resistance greater than 200 MKS Rayl, the first and second acoustic baffles defining a channel therebetween, at least a portion of the channel extending along a longitudinal direction making an oblique angle with the first direction,
wherein for a frequency range extending at least from 1 kHz to 6 kHz, the first acoustically absorptive layer has an average acoustic absorption coefficient of greater than 0.2 as determined according to ASTM E1050-12, and the first sheet has an average acoustic reflectance of greater than 0.3 as determined from an acoustic transfer matrix determined according to ASTM E2611-17 and an average acoustic absorption coefficient of less than 0.05 as determined according to ASTM E1050-12.