Sound absorbing structure
AssigneeNichias Corporation
InventorsAtsushi Murakami, Takumi Arisawa, Motonori Kondoh, Kazuo Nishimoto, Takahiro Niwa
Life of this patent
Estimating the term…
Abstract
A sound absorbing structure including a film with through holes formed is laminated on a porous member having communicating voids on the side facing a sound source. At least one of the through holes has an opening area of 19 mm2 or more, and the total of the opening area accounts for 1 to 70% with respect to the area of a film formation surface on the porous member. A soundproof cover including the sound absorbing structure disposed on the inner surface of a cover main body are also provided.
Claims8
A sound absorbing structure comprising a first structure including:
- a first porous member having communicating voids;
- a first film having through holes, said first film laminated on a film formation surface of said first porous member for facing a sound source;
- and
- a second film having no hole and a ventilation ratio of 100 cm3/cm2/sec or more, and laminated on said first film so as to cover an entire surface of said first film,
- wherein at least one of said through holes of said first film has an opening area of 19 mm2 or more, and the total of said opening area accounts for 1 to 70% with respect to an area of said film formation surface of said first porous member.
A soundproof cover comprising a sound absorbing structure disposed on an inner surface of a cover main body, said sound absorbing structure comprising a first structure including:
- a first porous member having communicating voids;
- a first film having through holes, said first film laminated on a film formation surface of said first porous member for facing a sound source;
- and
- a second film having no hole and a ventilation ratio of 100 cm3/cm2/sec or more, and laminated on said first film so as to cover an entire surface of said first film,
- wherein at least one of said through holes of said first film has an opening area of 19 mm2 or more, and the total of said opening area accounts for 1 to 70% with respect to an area of said film formation surface of said first porous member.
Dependencies are inferred from the claim text.