Acoustics – Sound-modifying means – Sound absorbing panels
Patent
1997-04-09
1998-12-29
Dang, Khanh
Acoustics
Sound-modifying means
Sound absorbing panels
181295, 181286, E04B 182
Patent
active
058544534
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a sound absorbing body, sound absorbing board, and sound absorbing unit disposed on a surface of a sound absorbing structure in the use of sound-proof walls, tunnel interior walls, and so on in the field of indoor acoustic design for ceilings and wall surfaces and in the field of outdoor noise control.
BACKGROUND ART
Heretofore, fiber mat boards such as asbestos boards, glass wool boards, etc. are used as sound absorbing boards provided on ceilings, wall surfaces, and so on. These fiber mat boards have a disadvantage that these boards are inferior in sound absorbing property in a low frequency band, while they have a sound absorbing effect in middle and high tone bands.
Therefore, an arrangement of a sound absorbing board in which a porous structure of a flat board with a large number of through-holes formed therein is provided in the front of an air chamber is known as a sound absorbing structure excellent in sound absorbing property in a low frequency band.
However, the conventional porous structure sound absorbing board has a problem as follows. Since the board has a shape in which a large number of holes which open in a plane are formed, these holes are visible from the outside when the board is disposed to a ceiling or wall surface so that a visual point of a person cannot come on a wall surface and an unpleasant feeling is given to the person by flicker. Furthermore, there is a limitation in design because the structure has such a simple shape in which only a large number of holes are formed to open in a plane. Furthermore, there is another problem that the large number of holes are stained to make the external appearance poor or to make the sound absorbing property deteriorate.
The present invention has an object to provide a sound absorbing body having a porous structure which is disposed in the front of an air chamber so as to form a sound absorbing structure with a good sound absorbing property, and which can provide a good external appearance without causing visual flicker.
Another object of the present invention is to provide a sound absorbing board in which while a porous structure is provided with a large number of through-holes, those holes can be prevented from being stained or choked.
DISCLOSURE OF THE INVENTION
The above-mentioned object of the present invention can be achieved by a sound absorbing body comprising: surface of the sound absorbing main body for reinforcing the sound absorbing main body, each of the ribs having a desired cross-sectional shape; surface to its back surface correspondingly to the respective ribs; and sound absorbing main body for concealing the through-holes.
It is preferable to make the ribs integrally with the sound absorbing main body.
Further, the above-mentioned object of the present invention can be achieved by a sound absorbing board comprising: body for reinforcing the sound absorbing main body; provided on the sound absorbing main body; and main body for concealing the through-holes.
It is preferable to make the height of the upper surface of the concealing materials not higher than the height of the upper surface of the ribs respectively. sound absorbing board characterized by comprising: board body for reinforcing the sound absorbing main body, each of the ribs having a cross-sectional shape widened toward its top end; and to reach its back surface in portions at root ends of the ribs concealed by the top ends of the ribs; of the root end of each of the ribs and shorter than width of the top end of each of the ribs so that the through-holes open on both sides of each of the ribs.
Further, the above-mentioned object of the present invention can be achieved by a sound absorbing body disposed in the front of an air chamber so as to constitute a sound absorbing structure together with the air chamber characterized by comprising: opposite side to the air chamber so as to form a resonant space which communicates with the air chamber and has a closed upper face to thereby provide a sound absorbing effe
REFERENCES:
patent: 3269484 (1966-08-01), Lighter
patent: 4829728 (1989-05-01), Castelli
patent: 5362931 (1994-11-01), Fries
patent: 5532440 (1996-07-01), Fujiwara
Fujiwara Kyoji
Furuta Naoyuki
Mikami Takashi
Mizukami Tadanori
Tasaki Yutaka
Dang Khanh
Nitto Boseki Co. Ltd.
Safran David S.
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