| 摘要 |
PURPOSE:To prevent the destruction and deformation of a skin material caused by the heating of a voice coil, by forming holes in skin materials stuck to both top and reverse surfaces of a plane diaphragm using a honeycomb structure as a core material. CONSTITUTION:Core material 1 is made of a honeycomb structure using aluminum foil or other materials and to both top and reverse surfaces, skin materials 2 and 3, such as a metallic sheet and synthetic resin sheet, are stucked, thereby forming a honeycomb diaphragm. Bobbins 4 are fixed to the reverse surface of this diaphragm at the side of skin material 3 and wound with voice coils 5. Then, holes 2a and 3a are provided in at least either skin material of top-side skin material 2 and reverse- side skin material 3 to prevent capsule (a) from being in a tight closuer state when voice coil 5 heats up. |
