JP5107794B2 - Panel speaker mounting structure - Google Patents

Panel speaker mounting structure Download PDF

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JP5107794B2
JP5107794B2 JP2008138620A JP2008138620A JP5107794B2 JP 5107794 B2 JP5107794 B2 JP 5107794B2 JP 2008138620 A JP2008138620 A JP 2008138620A JP 2008138620 A JP2008138620 A JP 2008138620A JP 5107794 B2 JP5107794 B2 JP 5107794B2
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panel
fixed
sound
frame
housing recess
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JP2009290363A (en
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信諭 門脇
崇 佐久間
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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本発明は、パネルスピーカ取付構造に関する。   The present invention relates to a panel speaker mounting structure.

従来、天井または壁の設置面にパネルスピーカを取付けるためのパネルスピーカ取付構造がある（特許文献１参照）。   Conventionally, there is a panel speaker mounting structure for mounting a panel speaker on a ceiling or wall installation surface (see Patent Document 1).

このようなパネルスピーカにおいて、充分な音響特性を得るためには、設置面方向に大きく突出する大型の加振器を設ける必要がある。しかし、パネルスピーカの厚みが増加するので、居室空間の意匠を阻害するおそれがある。   In such a panel speaker, in order to obtain sufficient acoustic characteristics, it is necessary to provide a large vibrator that protrudes greatly in the direction of the installation surface. However, since the thickness of the panel speaker increases, the design of the room space may be hindered.

そこで、図４に示すように、パネルスピーカ１を、例えば、天井等の設置面２の方向に突出する収容凹部３ａを有するフレーム３と、このフレーム３の前面に取付ける振動板４と、収容凹部３ａの底面と振動板４の後面とに取付ける加振器５とで構成する。   Therefore, as shown in FIG. 4, the panel speaker 1 includes, for example, a frame 3 having an accommodation recess 3 a protruding in the direction of the installation surface 2 such as a ceiling, a diaphragm 4 attached to the front surface of the frame 3, and an accommodation recess. The vibration exciter 5 is attached to the bottom surface of 3a and the rear surface of the diaphragm 4.

そして、固定パネル６を天井等の設置面２に固定して、フレーム３の収容凹部３ａを天井等の設置面２の取付開口部２ａに納めながら、フレーム３を固定パネル６に固定することで、パネルスピーカ１が天井等の設置面２に取付けられるようになる。
特開平８−１７２６９０号公報 Then, by fixing the fixed panel 6 to the installation surface 2 such as the ceiling, and fixing the frame 3 to the fixed panel 6 while accommodating the housing recess 3a of the frame 3 in the mounting opening 2a of the installation surface 2 such as the ceiling. The panel speaker 1 is attached to the installation surface 2 such as the ceiling.
JP-A-8-172690

しかしながら、天井等の設置面２の取付開口部２ａにフレーム３の収容凹部３ａ、つまり加振器５を納めているから、パネルスピーカ１の後部から発生する音ａが上階の床７から上室に漏れることがある（符号ｂ参照）。また、設置面２が壁であれば、壁から隣室に漏れることになる。   However, since the housing recess 3 a of the frame 3, that is, the vibrator 5 is housed in the mounting opening 2 a of the installation surface 2 such as the ceiling, the sound a generated from the rear part of the panel speaker 1 is raised from the floor 7 on the upper floor. May leak into the chamber (see symbol b). Moreover, if the installation surface 2 is a wall, it will leak from a wall to an adjacent room.

本発明は、前記問題を解消するためになされたもので、天井等の設置面の取付開口部に加振器を納めるタイプであっても、上階や隣室に音が漏れないように工夫したパネルスピーカ取付構造を提供することを目的とするものである。   The present invention has been made to solve the above problems, and has been devised so that sound does not leak to the upper floor or the adjacent room even if the vibrator is placed in the mounting opening of the installation surface such as the ceiling. An object of the present invention is to provide a panel speaker mounting structure.

前記課題を解決するために、本発明は、天井または壁の設置面にパネルスピーカを取付けるためのパネルスピーカ取付構造であって、前記天井または壁の設置面におけるパネルスピーカの設置位置には、取付開口部が形成され、前記パネルスピーカは、設置面方向に突出する第１収容凹部を形成したフレームを有し、周縁部を前記フレームの前面で支持された状態で前記取付開口部を前方から被覆するように前記設置面に沿って配置される振動板と、この振動板の後面中央領域に取付けられるとともに前記第１収容凹部に収容される加振器とを備えて構成され、前記フレームの後面に対面する対面部と、設置面方向に突出して、前記フレームの第１収容凹部を収容可能な第２収容凹部とを形成した固定兼遮音パネルが設けられ、前記固定兼遮音パネルは、第２収容凹部を前記取付開口部に嵌め込んだ状態で、天井または壁の設置面に固定され、前記パネルスピーカは、第１収容凹部を第２収容凹部に嵌め込んだ状態で、フレームのフック部が固定兼遮音パネルのフック受け部に係止固定されることで、天井または壁の設置面に取付けられるようになり、さらに、前記フレームの第１収容凹部と固定兼遮音パネルの第２収容凹部との間に空隙が形成され、前記固定兼遮音パネルの第２収容凹部の底部は中空部に形成され、この中空部に吸音材が充填されていることを特徴とするパネルスピーカ取付構造を提供するものである。 In order to solve the above problems, the present invention provides a panel speaker mounting structure for mounting a panel speaker on a ceiling or wall installation surface, wherein the panel speaker is mounted on the ceiling or wall installation surface. An opening is formed, and the panel speaker has a frame formed with a first receiving recess that protrudes in the direction of the installation surface , and covers the mounting opening from the front with a peripheral edge supported by the front surface of the frame. And a vibration plate disposed along the installation surface, and a vibrator attached to the central region of the rear surface of the vibration plate and accommodated in the first accommodation recess , the rear surface of the frame A fixed and sound insulating panel is provided, which has a facing portion facing the first and a second receiving recess that protrudes in the direction of the installation surface and can receive the first receiving recess of the frame. The panel is fixed to the installation surface of the ceiling or wall with the second housing recess fitted into the mounting opening, and the panel speaker is fitted with the first housing recess into the second housing recess, The hook portion of the frame is locked and fixed to the hook receiving portion of the fixing / sound insulation panel, so that the frame can be attached to the installation surface of the ceiling or the wall. A panel speaker characterized in that a gap is formed between the second housing recess and the bottom of the second housing recess of the fixed and sound insulation panel is formed in a hollow portion, and the sound absorbing material is filled in the hollow portion. An attachment structure is provided.

請求項２のように、請求項１において、前記固定兼遮音パネルの第２収容凹部の底部に、不均一に配列された複数の制振用リブが取付けられていることが好ましい。 As in claim 2 , in claim 1 , it is preferable that a plurality of non-uniformly arranged vibration damping ribs are attached to the bottom of the second housing recess of the fixed and sound insulation panel.

本発明によれば、天井または壁の設置面のパネルスピーカの取付開口部の奥方位置に、パネルスピーカの加振器と離間して対向する遮音手段である第２収容凹部が配置されている。これにより、パネルスピーカの後部から発生する音が遮音手段で遮音されて、空気を通じて振動が伝播する空気伝播による音漏れを防止でき、上階等に音が漏れないようになる。 According to the present invention, the second housing recess, which is a sound insulating means that is spaced apart from the vibrator of the panel speaker, is disposed in a position behind the mounting opening of the panel speaker on the installation surface of the ceiling or wall. Thereby, the sound generated from the rear part of the panel speaker is sound-insulated by the sound-insulating means, and sound leakage due to air propagation in which vibration propagates through the air can be prevented, and sound does not leak to the upper floor or the like.

また、第２収容凹部を取付開口部に嵌め込んだ状態で、固定兼遮音パネルを天井等の設置面に固定するとともに、第１収容凹部を第２収容凹部に嵌め込んだ状態で、フレームを固定兼遮音パネルに固定する。これにより、フレームの第１収容凹部は、固定兼遮音パネルの第２収容凹部で覆われるから、パネルスピーカの後部から発生する音が第２収容凹部で遮音されて、空気を通じて振動が伝播する空気伝播による音漏れを防止でき、上階等に音が漏れないようになる。 Further, in a state of fitting the second housing recess in the mounting opening, it is fixed to the fixed and sound insulating panel to the installation surface such as a ceiling, in a state of fitting the first accommodation recess in the second housing recess, the frame Fix to the fixed and sound insulation panel. As a result, the first housing recess of the frame is covered with the second housing recess of the fixed and sound insulation panel, so that the sound generated from the rear of the panel speaker is sound-insulated by the second housing recess and the vibration propagates through the air. Sound leakage due to propagation can be prevented, and sound does not leak to upper floors.

また、固定パネルに、遮音用の第２収容凹部を形成することで、固定パネルが遮音パネルを兼用する固定兼遮音パネルとすることができる。   Moreover, by forming the second housing recess for sound insulation in the fixed panel, the fixed panel can be a fixed and sound insulation panel that also serves as the sound insulation panel.

さらに、第１収容凹部と第２収容凹部との間に空隙を形成することにより、接続部分を通じて振動が伝播する固定伝播による音漏れを防止できるようになる。 Furthermore, by forming a gap between the first accommodation recess and the second accommodation recess, it is possible to prevent sound leakage due to fixed propagation in which vibration propagates through the connection portion.

また、第２収容凹部の底部の中空部に吸音材を充填することにより、中空部に侵入した音エネルギーを外部に漏らすことなく、内部の吸音材で減衰できるので、外部へ漏れる音エネルギーが減少して、より効果的に音漏れを防止できるようになる。 In addition, by filling the hollow portion at the bottom of the second housing recess with a sound absorbing material, the sound energy entering the hollow portion can be attenuated by the internal sound absorbing material without leaking to the outside, so the sound energy leaking to the outside is reduced. Thus, sound leakage can be prevented more effectively.

請求項２によれば、第２収容凹部の底部に、複数の制振用リブを取付けることにより、底部を制振することで、空気伝播による音漏れをより効果的に防止できるようになる。また、複数の制振用リブを不均一に配列することで、不要な定在波や高調波が発生しなくなる。 According to claim 2, the bottom portion of the second housing recess, by mounting a plurality of damping ribs, by damping the bottom, it becomes possible to more effectively prevent sound leakage by air-borne. Further, by arranging the plurality of damping ribs non-uniformly, unnecessary standing waves and harmonics are not generated.

以下、本発明を実施するための最良の形態について、図面を参照しながら詳細に説明する。   Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

図１は、第１実施形態である。パネルスピーカ１は、天井等の設置面２の方向に突出する第１収容凹部３ａを有するフレーム３を備えている。また、このフレーム３の前面に取付けられる振動板４と、第１収容凹部３ａに収容されて、振動板４の後面中央領域で、第１収容凹部３ａの底面と振動板４の後面とに取付けられる加振器５とを備えている。このパネルスピーカ１は、平面視で略四角形状であるが、略丸形状等であっても良い。   FIG. 1 is a first embodiment. The panel speaker 1 includes a frame 3 having a first receiving recess 3a that protrudes in the direction of an installation surface 2 such as a ceiling. The diaphragm 4 attached to the front surface of the frame 3 is accommodated in the first accommodating recess 3a and attached to the bottom surface of the first accommodating recess 3a and the rear surface of the diaphragm 4 in the central area of the rear surface of the diaphragm 4. The vibration exciter 5 is provided. The panel speaker 1 has a substantially square shape in plan view, but may have a substantially round shape or the like.

また、フレーム３の後面に対面する対面部９ａと、設置面２の方向に突出して、フレーム３の第１収容凹部３ａを収容可能な第２収容凹部（遮音手段）９ｂとを形成した固定兼遮音パネル９が設けられている。この固定兼遮音パネル９は、例えば鉄板製である。   Further, the fixed and combined portion formed with a facing portion 9a facing the rear surface of the frame 3 and a second receiving recess (sound insulating means) 9b protruding in the direction of the installation surface 2 and capable of receiving the first receiving recess 3a of the frame 3. A sound insulation panel 9 is provided. This fixed and sound insulation panel 9 is made of, for example, an iron plate.

固定兼遮音パネル９の第２収容凹部９ｂの底部は、二重の鉄板で封止された中空部９ｄに形成され、この中空部９ｄに吸音材１０が充填されている。吸音材１０としては、グラスウール等が好ましく、これを圧縮して充填することにより、より薄型化が可能であると同時に、遮音性能の向上も可能となる。   The bottom of the second housing recess 9b of the fixed and sound insulation panel 9 is formed in a hollow portion 9d sealed with a double iron plate, and the sound absorbing material 10 is filled in the hollow portion 9d. As the sound absorbing material 10, glass wool or the like is preferable, and by compressing and filling it, the thickness can be further reduced, and at the same time, the sound insulation performance can be improved.

また、フレーム３の第１収容凹部３ａと固定兼遮音パネル９の第２収容凹部９ｂとの間に空隙Ｓが形成されている。なお、この空隙Ｓにも、吸音材１０を充填することが好ましく、より効果的に音漏れを防止できるようになる。   In addition, a gap S is formed between the first housing recess 3 a of the frame 3 and the second housing recess 9 b of the fixed and sound insulation panel 9. In addition, it is preferable to fill the gap S with the sound-absorbing material 10, and sound leakage can be prevented more effectively.

天井等の設置面２には、固定兼遮音パネル９の第２収容凹部９ｂの取付開口部２ａが形成されて、固定兼遮音パネル９は、第２収容凹部９ｂが取付開口部２ａに嵌め込まれた（納められた）状態で、天井等の設置面２にビス等で固定されるようになる。   A mounting opening 2a of the second housing recess 9b of the fixed / sound insulation panel 9 is formed on the installation surface 2 such as the ceiling, and the second housing recess 9b of the fixed / sound insulating panel 9 is fitted into the mounting opening 2a. In such a state, it is fixed to the installation surface 2 such as the ceiling with screws or the like.

そして、パネルスピーカ１は、フレーム３の第１収容凹部３ａを固定兼遮音パネル９の第２収容凹部９ｂに嵌め込んだ状態で、フレーム３のフック部３ｃが固定兼遮音パネル９のフック受け部９ｃに係止固定される。これにより、天井等の設置面２に取付けられるようになる。   In the panel speaker 1, the hook portion 3 c of the frame 3 is hooked to the fixing / sound insulation panel 9 in a state where the first housing recess 3 a of the frame 3 is fitted into the second accommodation recess 9 b of the fixing / sound insulation panel 9. It is locked and fixed to 9c. Thereby, it comes to attach to installation surfaces 2, such as a ceiling.

第１実施形態であれば、第２収容凹部９ｂを取付開口部２ａに嵌め込んだ状態で、固定兼遮音パネル９を天井等の設置面２に固定するとともに、第１収容凹部３ａを第２収容凹部９ｂに嵌め込んだ状態で、フレーム３を固定兼遮音パネル９に固定する。   According to the first embodiment, the fixing and sound insulating panel 9 is fixed to the installation surface 2 such as the ceiling in a state where the second housing recess 9b is fitted in the mounting opening 2a, and the first housing recess 3a is the second. The frame 3 is fixed to the sound-insulating panel 9 while being fitted in the housing recess 9b.

これにより、フレーム３の第１収容凹部３ａは、固定兼遮音パネル９の第２収容凹部９ｂで覆われるようになる。したがって、パネルスピーカ１の後部から発生する音ａが第２収容凹部９ｂで遮音されて、空気を通じて振動が伝播する空気伝播による音漏れを防止でき、上階の床７等から上室等に等に音が漏れないようになる。   As a result, the first housing recess 3 a of the frame 3 is covered with the second housing recess 9 b of the fixed and sound insulation panel 9. Therefore, the sound a generated from the rear portion of the panel speaker 1 is sound-insulated by the second housing recess 9b, so that sound leakage due to air propagation in which vibration propagates through the air can be prevented, such as from the floor 7 on the upper floor to the upper room, etc. Sound will not leak.

また、固定パネルに、遮音用の第２収容凹部９ｂを形成することで、固定パネルが遮音パネルを兼用する固定兼遮音パネル９とすることができる。   In addition, by forming the second housing recess 9b for sound insulation on the fixed panel, the fixed panel can be the fixed and sound insulation panel 9 that also serves as the sound insulation panel.

さらに、フレーム３の第１収容凹部３ａと固定兼遮音パネル９の第２収容凹部９ｂとの間に空隙（遮音手段）Ｓを形成することにより、接続部分を通じて振動が伝播する固定伝播による音漏れを防止できるようになる。   Further, by forming a gap (sound insulation means) S between the first housing recess 3a of the frame 3 and the second housing recess 9b of the fixed and sound insulation panel 9, sound leakage due to fixed propagation in which vibration propagates through the connecting portion. Can be prevented.

さらにまた、固定兼遮音パネル９の第２収容凹部９ｂの底部の中空部９ｄに吸音材（遮音手段）１０を充填している。これにより、中空部９ｄに侵入した音エネルギーを外部に漏らすことなく、内部の吸音材１０で減衰できるので、外部へ漏れる音エネルギーが減少して、より効果的に音漏れを防止できるようになる。特に、底部の中空部９ｄに吸音材１０を充填する代わりに、同じ厚さを持つ鉄板等とすれば、同等の遮音性能を得ることができるが、重量が増加するので、天井等に取付けるパネルスピーカ１としては好ましくない。これに対して、底部の中空部９ｄに吸音材１０を充填すれば、軽量化が可能となるので、天井等に取付けるパネルスピーカ１としては好適となる。   Furthermore, a sound absorbing material (sound insulating means) 10 is filled in the hollow portion 9d at the bottom of the second housing recess 9b of the fixed and sound insulating panel 9. Thereby, the sound energy that has entered the hollow portion 9d can be attenuated by the internal sound absorbing material 10 without leaking to the outside, so that the sound energy leaking to the outside is reduced, and sound leakage can be prevented more effectively. . In particular, instead of filling the hollow portion 9d of the bottom portion with the sound absorbing material 10, an equivalent sound insulation performance can be obtained by using an iron plate or the like having the same thickness. However, since the weight increases, the panel is attached to the ceiling or the like. The speaker 1 is not preferable. On the other hand, if the sound absorbing material 10 is filled in the hollow portion 9d at the bottom, the weight can be reduced, which is suitable for the panel speaker 1 attached to the ceiling or the like.

図２および図３は、第２実施形態である。第１実施形態と相違するのは、固定兼遮音パネル９の第２収容凹部９ｂの底部の外面に、不均一に配列した複数の制振用リブ（遮音手段）１１を取付けたことである。なお、第１実施形態の構成に第２実施形態の構成を組み合わせて使用することも可能である。   2 and 3 show a second embodiment. The difference from the first embodiment is that a plurality of non-uniformly arranged damping ribs (sound insulation means) 11 are attached to the outer surface of the bottom of the second housing recess 9 b of the fixed and sound insulation panel 9. In addition, it is also possible to use the configuration of the second embodiment in combination with the configuration of the first embodiment.

制振用リブ１１は、第２収容凹部９ｂの底部の内面に取付けることもできる。また、リブ１１は、棒状以外に、円形状や波形状であっても良い。また、第２収容凹部９ｂは、平面視で正方形である必要は無く、いびつな形状、あるいは楕円形であっても良い。   The damping rib 11 can also be attached to the inner surface of the bottom of the second housing recess 9b. Further, the rib 11 may have a circular shape or a wave shape other than the rod shape. Moreover, the 2nd accommodation recessed part 9b does not need to be square in planar view, and may be an irregular shape or an ellipse.

第２実施形態であれば、第２収容凹部９ｂの底部に、複数の制振用リブ１１を取付けることにより、底部を制振することで、空気伝播による音漏れをより効果的に防止できるようになる。また、複数の制振用リブ１１を不均一に配列することで、不要な定在波や高調波が発生しなくなる。   According to the second embodiment, sound leakage due to air propagation can be more effectively prevented by damping the bottom by attaching a plurality of damping ribs 11 to the bottom of the second housing recess 9b. become. Further, by arranging the plurality of damping ribs 11 non-uniformly, unnecessary standing waves and harmonics are not generated.

本発明の第１実施形態のパネルスピーカ取付構造の断面図である。It is sectional drawing of the panel speaker attachment structure of 1st Embodiment of this invention. 本発明の第２実施形態のパネルスピーカ取付構造の断面図である。It is sectional drawing of the panel speaker attachment structure of 2nd Embodiment of this invention. 図２の要部平面図である。It is a principal part top view of FIG. 背景技術のパネルスピーカ取付構造の断面図である。It is sectional drawing of the panel speaker attachment structure of background art.

符号の説明Explanation of symbols

１ パネルスピーカ
２ 設置面
２ａ 取付開口部
３ フレーム
３ａ 第１収容凹部
４ 振動板
５ 加振器
９ 固定兼遮音パネル
９ａ 対向面
９ｂ 第２収容凹部（遮音手段）
９ｄ 中空部
１０ 吸音材（遮音手段）
１１ 制振用リブ（遮音手段）
Ｓ 空隙（遮音手段）
DESCRIPTION OF SYMBOLS 1 Panel speaker 2 Installation surface 2a Mounting opening 3 Frame 3a 1st accommodation recessed part 4 Diaphragm 5 Exciter
9 Fixing and sound insulation panel 9a Opposing surface 9b Second housing recess (sound insulation means)
9d Hollow part 10 Sound absorbing material (sound insulation means)
11 Rib for vibration control (sound insulation means)
S Air gap (sound insulation means)

Claims (2)

天井または壁の設置面にパネルスピーカを取付けるためのパネルスピーカ取付構造であって、
前記天井または壁の設置面におけるパネルスピーカの設置位置には、取付開口部が形成され、
前記パネルスピーカは、設置面方向に突出する第１収容凹部を形成したフレームを有し、周縁部を前記フレームの前面で支持された状態で前記取付開口部を前方から被覆するように前記設置面に沿って配置される振動板と、この振動板の後面中央領域に取付けられるとともに前記第１収容凹部に収容される加振器とを備えて構成され、
前記フレームの後面に対面する対面部と、設置面方向に突出して、前記フレームの第１収容凹部を収容可能な第２収容凹部とを形成した固定兼遮音パネルが設けられ、
前記固定兼遮音パネルは、第２収容凹部を前記取付開口部に嵌め込んだ状態で、天井または壁の設置面に固定され、
前記パネルスピーカは、第１収容凹部を第２収容凹部に嵌め込んだ状態で、フレームのフック部が固定兼遮音パネルのフック受け部に係止固定されることで、天井または壁の設置面に取付けられるようになり、
さらに、前記フレームの第１収容凹部と固定兼遮音パネルの第２収容凹部との間に空隙が形成され、
前記固定兼遮音パネルの第２収容凹部の底部は中空部に形成され、この中空部に吸音材が充填されていることを特徴とするパネルスピーカ取付構造。 A panel speaker mounting structure for mounting a panel speaker on a ceiling or wall installation surface,
At the installation position of the panel speaker on the installation surface of the ceiling or wall, a mounting opening is formed,
The panel speaker has a frame formed with a first receiving recess that protrudes in the direction of the installation surface , and the installation surface covers the mounting opening from the front with a peripheral edge supported by the front surface of the frame. A vibration plate disposed along the vibration center, and a vibrator attached to the central region of the rear surface of the vibration plate and housed in the first housing recess ,
A fixed and sound insulation panel is provided that has a facing portion facing the rear surface of the frame and a second receiving recess that protrudes in the direction of the installation surface and can receive the first receiving recess of the frame,
The fixed and sound insulation panel is fixed to the installation surface of the ceiling or wall with the second receiving recess fitted into the mounting opening.
In the panel speaker, the hook portion of the frame is locked and fixed to the hook receiving portion of the fixing and sound insulation panel in a state where the first receiving recess portion is fitted in the second receiving recess portion. Can be installed and
Further, a gap is formed between the first housing recess of the frame and the second housing recess of the fixed and sound insulation panel,
A panel speaker mounting structure, wherein a bottom portion of the second housing recess of the fixed and sound insulation panel is formed in a hollow portion, and the hollow portion is filled with a sound absorbing material . 前記固定兼遮音パネルの第２収容凹部の底部に、不均一に配列された複数の制振用リブが取付けられていることを特徴とする請求項１に記載のパネルスピーカ取付構造。 The panel speaker mounting structure according to claim 1 , wherein a plurality of nonuniformly arranged damping ribs are attached to the bottom of the second housing recess of the fixed and sound insulating panel.
JP2008138620A 2008-05-27 2008-05-27 Panel speaker mounting structure Expired - Fee Related JP5107794B2 (en)

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WO2016060210A1 (en) * 2014-10-15 2016-04-21 ヤマハ株式会社 Acoustic system
JP2016134724A (en) * 2015-01-19 2016-07-25 大和ハウス工業株式会社 Acoustic device and acoustic structure including the same
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