The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 08, 2022
Filed:
Dec. 18, 2019
Fujifilm Corporation, Tokyo, JP;
Yoshihiro Sugawara, Kanagawa, JP;
Shogo Yamazoe, Kanagawa, JP;
Shinya Hakuta, Kanagawa, JP;
Akihiko Ohtsu, Kanagawa, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
An object is to provide a silencing system that can achieve both high ventilation performance and high soundproof performance, can silence a plurality of pieces of resonant sound, and has high general-purpose properties since the silencing system does not need to be designed according to a tubular member. In a silencing system where silencers are disposed on a tubular member, the silencers silence sound having a frequency of first resonance of the tubular member, each silencer includes a cavity portion and an opening portion, the opening portions are connected to a sound field space of the first resonance of the tubular member, a conversion mechanism for converting sound energy into thermal energy is disposed in each cavity portion or at a position where the conversion mechanism covers the opening portion, a ratio S/Sof the area Sto the area Ssatisfies '0<S/S<40%' in a case where the area of the opening portion of the silencer is denoted by Sand the surface area of an inner wall of the cavity portion is denoted by S, and the depth Lof the cavity portion in the traveling direction of an acoustic wave in the silencer satisfies '0.011×λ<L<0.25×λ,' in a case where the wavelength of an acoustic wave at the resonant frequency of the first resonance is denoted by λ.