To form a bridge that does not have an adding part between a holding means and a panel by forming an elastic fixing means by a central layer and/or at least one of two surface layers.
One penetration hole 20 having a shank 16 of a screw 14 and plural penetration holes 20 that directly adjoin the hole 20 have a truncated length L2 in comparison with plural other penetration holes which are formed in a central layer 11 and have a length L1. The holes 20 are deformed slightly horizontally against the direction of the shank 16 of the screw 14 owing to the truncated length L2 of plural holes 20 in comparison with plural holes 20 having the length L1. When the holes 20 are buried with foaming synthetic resin material, the shank 16 of the screw 14 is connected to a holding means and a panel 10 is transformed into a waveform, the holes 20 are prevented from receiving damage. An area 13 of a lower surface layer 12.2 holds a space A1 from the screw 14 and holds a space A2 from foamed body in order to improve the spring action of the layer 11.
| JPS59108500 | DYNAMIC SPEAKER |
| JP2008306339 | SPEAKER |
KRUMP GERHARD DR
REGL HANS-JUERGEN
