| 摘要 |
A LOUDSPEAKER DIAPHRAGM HAVING LIGHT WEIGHT AND AN EXCELLENT BALANCE BETWEEN A RIGIDITY AND AN INTERNAL LOSS, AND A SIMPLE AND INEXPENSIVE METHOD FOR MANUFACTURING SUCH A DIAPHRAGM ARE PROVIDED. A LOUDSPEAKER DIAPHRAGM ACCORDING TO THE PRESENT INVENTION INCLUDES A BASE LAYER HAVING A WOVEN FABRIC OF A POLYETHYLENE NAPHTHALATE FIBER IMPREGNATED WITH A THERMOSETTING RESIN, AND OPTIONALLY A THERMOPLASTIC RESIN LAYER AND/OR A THERMOPLASTIC ELASTOMER LAYER. THEPOLYETHYLENENAPHTHALATEFIBERISPREFERABLYANUNTWISTEDFIBER. A FIBER/RESIN RATIO IN THE BASE LAYER IS PREFERABLY IN THE RANGE OF 60/40 TO 80/20. PREFERABLY, THE THERMOPLASTIC RESIN LAYER HAS A FINELY FOAMED STRUCTURE AND AN AVERAGE DIAMETER OF A CELL IN THE FINELY FOAMED STRUCTURE IS 10 TO 60 µM. |
