Title:
音響システム
Document Type and Number:
Japanese Patent JP7186238
Kind Code:
B2
Abstract:
An acoustic system includes a duct that has a function of causing a fluid to flow therein and has a tubular shape, an internal sound source that is disposed inside the duct on an upstream side or at an outer peripheral portion of the duct, which communicates with an inside of the duct on the upstream side, or an external sound source that is on an outside from an end portion of the duct, and a membrane-shaped member that is formed as a part of a wall of the duct and vibrates in response to sound. A structure including the membrane-shaped member and a rear surface closed space thereof causes acoustic resonance to occur, transmits the acoustic resonance from the sound source into the duct, and suppresses sound radiated from the other end portion of the duct on a downstream side. The external sound source is at a distance within a wavelength at a frequency of the acoustic resonance on the outside from the end portion of the duct. In the acoustic system, as a small membrane-type resonance structure is disposed in a flow passage horizontal direction, wind does not directly hit a membrane surface perpendicularly, and since the acoustic system does not have a through hole or a hole, wind noise can be eliminated.
Inventors:
Shinya Shirata
Vitaly Gusev
Akihiko Otsu
Shogo Yamazoe
Vitaly Gusev
Akihiko Otsu
Shogo Yamazoe
Application Number:
JP2020553039A
Publication Date:
December 08, 2022
Filing Date:
October 02, 2019
Export Citation:
Assignee:
FUJIFILM Corporation
International Classes:
G10K11/172; F24F13/02; F24F13/24; G10K11/16
Domestic Patent References:
| JP2003083186A | ||||
| JP2004293365A | ||||
| JP2007321738A | ||||
| JP2001248418A |
Foreign References:
| WO2018150828A1 |
Attorney, Agent or Firm:
Hideaki Ito
Fumio Mihashi
Fumio Mihashi