Matsushita Electric Industrial Co., Ltd.

Hisashi Yoshimura

Isago Konno

Tadao Ohtani

Nobuyuki Kato

Takao Kubo

Takashi Matsumoto

Yasutake Nishimura

Sadao Yukimoto

An inboard type magnetic system for an electrodynamic transducer which has a reduced height and magnetic flux leakage by making use of a manganese-aluminum-carbon system alloy magnet anisotropized by warm extrusion.

Inboard type magnetic system for electro-dynamic transducer

A structure of four-channel headphones having sound insulating means between front and rear channel driver units, and tone control means only for the front channel tones, said sound insulating means being formed of foam material which transmits low-pitched tones and absorbs high-pitched tones. Separation of the front and the rear channel tones is improved to closely resemble four-channel sound reproduction in a free field and the output levels of the medium-high range tones of the two front channels are made variable.

4-Channel headphones

Growing community of inventors

Minoo, Japan

Hisashi Yoshimura