Matsushita Electric Industrial Co., Ltd.

Teruo Doi

Kazuki Honda

Takafumi Yuasa

Takashi Sabato

Toshihide Takizawa

Takashi Suzuki

Hiroyuki Takewa

Mitsukazu Kuze

Shinya Mizone

Satoshi Koura

Mikio Iwasa

Yoshiyuki Takahashi

Shinya Tabata

Kiyoshi Ikeda

Hiroko Yamazaki

A diaphragm is gained by the co-molded of a dome part, a voice coil junction part, a cone part and a peripheral part through the injection mold of thermoplastic resin. The thickness of the central part of the dome is made great so that the resonance amplitude in this part becomes small. In addition, an annular rib is integrally provided to the voice coil junction part so as to increase the junction strength between the diaphragm and the voice coil bobbin. Thus, the electromagnetic driving force of the voice coil can be effectively transmitted to the diaphragm so that a loud speaker with excellent characteristics can be gained.

Loud speaker, diaphragm and process for making the diaphragm

A speaker system provides good acoustic characteristics for use in visual equipment, by controlling the turbulence in mid-range of response frequency characteristics to be flat so as to produce an excellent speech articulation. This is accomplished by coupling an acoustic pipe to the front of a speaker unit to guide sound waves through an opening of generally rectangle shape. A resonance absorption section is formed by a tube, one end of which forms a hole for absorbing sound facing to a sound path running within the acoustic pipe from the front of speaker unit to an opening, and a cavity having a small gap along the edge, except the area where is coupled through with the other end of tube. By constructing the speaker system in this way, the width of band to be absorbed and the Q of a dip can be controlled to suppress the peaks and dips, thereby providing a speaker system of good acoustic characteristics where the response frequency characteristics are flat and the speech articulation is excellent.

Speaker system

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Mie, Japan

Teruo Doi