Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Michitaka Oda

Hiroyuki Morimoto

Ryo Kuribayashi

Kazuyoshi Umemura

Shinya Tabata

Takenori Yamakawa

Yasuhiro Nakanishi

A loudspeaker includes the following components: a frame () that has a magnetic circuit () including a magnetic gap () therein; and a diaphragm () that is bonded to a voice coil () fitted into the magnetic gap () in the center thereof, and to the periphery of the frame () along the outer periphery thereof. The magnetic circuit () includes a yoke (), a magnet (), and a top plate (). Tongue-shaped flanges () are disposed at a substantially equidistant spacing in three positions to protrude from the top end face of the yoke (). The total area of these tongue-shaped flanges () in the three positions does not exceed a half of the total area corresponding to the flange part without flanges (). The frame () also includes engaging parts () each for receiving one of the tongue-shaped flanges () therein.

Loudspeaker

A magnetic circuit of the present invention uses a yoke, wherein a thickness of a bottom portionof the yokeis thicker than a thickness of a cylindrical peripheral portionof the yoke. The magnetic circuit of the present invention includes the yoke, a magnetbonded to the bottom portion of the yoke, and a top platebonded to the magnet, the top plate forming a magnetic gap with the cylindrical peripheral portion in between. According to a configuration of the present invention, it is possible to reduce the magnetic saturation in the bottom portion of the yoke and to improve the efficiency of the magnetic circuit. As a result, the configuration contributes to improve the performance and efficiency of a loudspeaker using the magnetic circuit of the present invention.

Magnetic circuit for loudspeaker and loudspeaker comprising it

Growing community of inventors

Mie, Japan

Michitaka Oda