Kabushikikaisha Kenwood

Trio Kabushiki Kaisha

Yutaka Mae

Hideki Ogawa

Shiro Iwakura

Masakatsu Sakamoto

Yoichi Yaguchi

Sigeyuki Koga

Hideaki Kanda

A speaker cone plate is provided with an inorganic surfacial hard layer formed at least on a face of a metal substrate and is subjected to a reinforcing treatment by hot isostatic pressing, wherein the surfacial hard layer may be composed of a carbide, an oxide, a borie or a phosphide or may be formed by plasma thermal spraying of an inorganic substance containing silicon nitride whiskers or silicon carbide whiskers.

Speaker cone plate and method of forming

A speaker system comprising a speaker cabinet having a forward baffle plate, two side plates and a rear plate, a passive diaphragm, a speaker mounted in the baffle plate of the speaker cabinet, an opening disposed in the baffle plate next to the speaker as an outlet for the sound radiated from the passive diaphragm, a dividing plate slantedly disposed between the baffle plate and the rear plate of the speaker cabinet, the dividing plate dividing the speaker cabinet into a first part including the speaker and a second part including the opening, the passive diaphragm being mounted in the dividing plate.

Speaker system

Growing community of inventors

Tokyo, Japan

Yutaka Mae