【図面の簡単な説明】[Brief explanation of drawings]
第１図は、本考案の第１実施例を示す斜視図、
第２図Ａ，Ｂはパネルの基本膜振動を示す説明図
、第３図Ａ，Ｂ，Ｃは、パネルに穿設した貫通孔
位置・形状を示す平面図、Ｄ，Ｅ，Ｆは、前記Ａ
，Ｂ，Ｃの各々の膜振動モードを示す説明図、第
４図Ａ，Ｂは、シートバツクパネルの膜振動の車
室内空気への伝達具合を示す比較図、第５図は、
本考案の簡易化モデル図、第６図は、車室内音圧
分布比較図、第７図は本考案の第２実施例を示す
斜視図、第８図は、本考案の第３実施例を示す斜
視図、第９図は、従来例を示す斜視図である。
１……シートバツクパネル、２……膜１次振動
対策用貫通孔、２ａ……膜２次振動対策用貫通孔
、２ｂ……面積の大きい貫通孔、２ｃ……面積の
小さい貫通孔、３……フランジ、４……リアピラ
ーインナ、５……ホイールハウスインナ、６……
リアパーセル、７……リアフロア、８……シート
バツクサイドパネル、９……車室、１０……トラ
ンクルーム。
FIG. 1 is a perspective view showing a first embodiment of the present invention;
Figures 2A and B are explanatory diagrams showing the basic membrane vibration of the panel, Figures 3A, B, and C are plan views showing the positions and shapes of through holes drilled in the panel, and D, E, and F are explanatory views showing the basic membrane vibration of the panel. A
, B, and C; FIGS. 4A and 4B are comparative diagrams showing how the membrane vibration of the seat back panel is transmitted to the cabin air; and FIG.
FIG. 6 is a simplified model diagram of the present invention, FIG. 6 is a comparison diagram of the sound pressure distribution inside the vehicle, FIG. 7 is a perspective view showing the second embodiment of the present invention, and FIG. 8 is a diagram showing the third embodiment of the present invention. FIG. 9 is a perspective view showing a conventional example. 1...Seat back panel, 2...Through hole for membrane primary vibration countermeasure, 2a...Through hole for membrane secondary vibration countermeasure, 2b...Through hole with large area, 2c...Through hole with small area, 3 ...Flange, 4...Rear pillar inner, 5...Wheel house inner, 6...
Rear parcel, 7... Rear floor, 8... Seat back side panel, 9... Vehicle interior, 10... Trunk room.