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AssigneeNichias Corporation
InventorsAtsushi Murakami, Shuuchirou Wada, Kazuo Nishimoto, Takahiro Niwa, Hiroto Sugai, Haruko Sasaki
Estimating the term…
A sound absorbing structure comprising at least one porous member including a plurality of holes, and the holes are at least one kind of through holes and non-through holes. It is preferable that a plurality of porous members are stacked. It is also preferable that the holes of porous members are formed as diameter-varied holes, and an area of opening of each diameter-varied hole formed in the surface opposite to a sound source is largest and the area of opening of each the diameter-varied hole is reduced in a direction of the thickness of the porous member. Moreover, it is also preferable that the sound absorbing structure further comprises a coating film formed on at least a surface of the porous member which is opposite to a sound source wherein the holes penetrates the coating film and the porous member.
A sound absorbing structure comprising at least one porous member including a plurality of holes, wherein said holes are at least one kind of through holes, that penetrate through the porous member, and/or non-through holes, that extend into but do not penetrate through the porous member, wherein 25%-compressive hardness of said porous member is 0.5 N/cm2 or lower, the sound absorbing structure further comprising a coating film formed on at least a surface of said porous member which is opposite to a sound source wherein said holes penetrate said coating film and said porous member, wherein a main component of said porous member is one of urethane foam and a molded fibrous material.
A sound absorbing structure comprising at least one porous member including a plurality of holes, wherein said holes are at least one kind of through holes, that penetrate through the porous member, and/or non-through holes, that extend into but do not penetrate through the porous member, wherein 25%-compressive hardness of said porous member is 0.5 N/cm2 or lower, wherein a plurality of porous members are stacked, the sound absorbing structure further comprising a coating film formed on at least a surface of said porous member which is opposite to a sound source wherein said holes penetrate said coating film and said porous member, wherein a main component of said porous member is one of urethane foam and a molded fibrous material.
Dependencies are inferred from the claim text.