JPS61174298U

JPS61174298U -

Info

Publication number: JPS61174298U
Application number: JP5733785U
Authority: JP
Priority date: 1985-04-17
Filing date: 1985-04-17
Publication date: 1986-10-30

Description

[Brief explanation of drawings]

第１図は本考案に係るスピーカの磁気回路構造
を示す半裁断面図で、第２図は同磁気回路構造に
おける磁気ギヤツプの磁束分布図、第３図乃至第
５図は他の実施例の磁気回路構造を示す半裁断面
図、第６図は従来のスピーカの磁気回路構造を示
す半裁断面図で、第７図は同磁気回路構造におけ
る磁気ギヤツプの磁束分布図を示す。１１……磁気回路、１２……ポール、１２ａ…
…凹部、１３……ヨーク、１４……マグネツト、
１５……トツププレート、１６……磁気ギヤツプ
、１７……補助ポール、１７ａ……底部、１７ｂ
……周壁、１９……ボイスコイル、Ｘ……中心線
。 FIG. 1 is a half-cut sectional view showing the magnetic circuit structure of a speaker according to the present invention, FIG. 2 is a magnetic flux distribution diagram of a magnetic gap in the same magnetic circuit structure, and FIGS. 3 to 5 are magnetic flux distribution diagrams of other embodiments. FIG. 6 is a half-cut cross-sectional view showing the magnetic circuit structure of a conventional speaker, and FIG. 7 shows a magnetic flux distribution diagram of the magnetic gap in the same magnetic circuit structure. 11...magnetic circuit, 12...pole, 12a...
... recess, 13... yoke, 14... magnet,
15...Top plate, 16...Magnetic gear, 17...Auxiliary pole, 17a...Bottom, 17b
...Peripheral wall, 19...Voice coil, X...Center line.

Claims

[Scope of utility model registration request]

A tapered recess whose diameter increases as it moves away from the top surface of the pole is formed on the outer periphery of the pole of the magnetic circuit consisting of a top plate, a magnet, a pole, and a yoke.
A top plate forming a magnetic gap in a magnetic circuit structure for a speaker including an auxiliary pole made of a magnetic material having a tapered peripheral wall whose bottom part contacts the top surface and whose diameter increases as it moves away from the top surface of the pole. The width of the opposing surface of the top plate is made smaller than the width of the opposing surface of the pole, and the center lines of the opposing surfaces of the top plate and the pole are made to coincide, and the shape of the opposing surface of the top plate is made line-symmetrical with respect to the above center line. A magnetic circuit structure for a speaker, characterized in that it is formed so that.