Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Patent
1998-01-26
1999-05-11
Le, Huyen
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
381426, 181169, H04R25/00
Patent
active
059036583
ABSTRACT:
Water-proofed natural pulp or organic synthetic fibers are with polyester-type fibers having a low melting point, and subjected to a paper fabrication process. The fabricated product is dried with hot air at a temperature higher than the melting point of the polyester-type fibers, thereby melt-bonding only intersections of the fibers without completely fusing the polyester-type fibers. The pressure of the hot air contributes to the formation of a predetermined shape. Thus, a water-proof diaphragm for a loudspeaker, having a large thickness, a low density, a high internal loss and a high stiffness, is obtained. By incorporating the thus formed diaphragm, a high-performance loudspeaker having a low distortion and a broad reproducing range is obtained.
REFERENCES:
patent: 4582163 (1986-04-01), Catthoor
patent: 5283027 (1994-02-01), Sakamoto et al.
patent: 5458958 (1995-10-01), Kanzaki et al.
Mizone Shinya
Okazaki Masatoshi
Shimizu Toshihiro
Le Huyen
Matsushita Electric - Industrial Co., Ltd.
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