Diaphragm-edge integral moldings for speakers and acoustic trans

Details Diaphragm-edge integral moldings for speakers and acoustic trans Diaphragm-edge integral moldings for speakers and acoustic trans

1994-06-28

1998-04-28

Dang, Khanh

Acoustics

Diaphragm

Critically defined material or coating

181169, 181170, 181174, G10K 1300

Patent

active

057447616

ABSTRACT:
A diaphragm for speakers comprises a self-support, shaped body including a tightly woven synthetic polymer fiber cloth substrate which has at least a diaphragm portion and edge portion shaped integrally with and extending from the diaphragm portion. The diaphragm portion of the cloth substrate had a polymer resin at least partially impregnated therein and the edge portion has a relatively flexible polymer material at least partially impregnated therein so that the edge portion is lower in stiffness than the diaphragm portion. The diaphragm-edge integral molding is fabricated by applying the respective types of polymers to the diaphragm and edge portions of the cloth substrate and subjecting the applied substrate to hot pressing in a mold capable of forming the integral molding. When applied as dynamic speakers, the integral molding exhibits a broad frequency band, low distortion rates and high sound quality. The stiffness difference between the diaphragm and edge portions may be created by using one type of thermoplastic resin which is applied to the diaphragm and edge portions in different amounts.

REFERENCES:
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patent: 2873813 (1959-02-01), Haerther, Jr. et al.
patent: 4076098 (1978-02-01), Ward
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patent: 4410768 (1983-10-01), Nakamura et al.
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patent: 4772513 (1988-09-01), Sakamoto et al.
patent: 5031720 (1991-07-01), Ohta et al.
patent: 5241140 (1993-08-01), Itoh et al.

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