JPH036200A - Low leakage flux type loudspeaker - Google Patents

Low leakage flux type loudspeaker

Info

Publication number
JPH036200A
JPH036200A JP14048289A JP14048289A JPH036200A JP H036200 A JPH036200 A JP H036200A JP 14048289 A JP14048289 A JP 14048289A JP 14048289 A JP14048289 A JP 14048289A JP H036200 A JPH036200 A JP H036200A
Authority
JP
Japan
Prior art keywords
magnetic
plate
metallic body
frame
lower plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP14048289A
Other languages
Japanese (ja)
Other versions
JP2638201B2 (en
Inventor
Masahide Sumiyama
昌英 隅山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP14048289A priority Critical patent/JP2638201B2/en
Publication of JPH036200A publication Critical patent/JPH036200A/en
Application granted granted Critical
Publication of JP2638201B2 publication Critical patent/JP2638201B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

PURPOSE:To prevent the generation of a leakage flux to the front part of the loudspeaker by sticking a laminated structure body consisting of a magnetic metallic body and a non-magnetic metallic body to the front part of the upper plate of a magnetic circuit and the front part of the center pole of the lower plate. CONSTITUTION:By forming integrally a magnetic circuit in which a main magnet 21 is inserted and held by the upper plate 22 and the lower plate 23 and bringing it to mold forming by a resin, a frame 25 is formed. To the front of the plate 22 of this frame 25, a shielding laminated plate 33 consisting of a magnetic metallic body 33b and a non-magnetic metallic body 33a is stuck by setting the metallic body 33a side as the sticking surface to the plate 22. Also, to the front of the center pole 23a of the plate 23, a shielding laminated plate 34 consisting of a magnetic metallic body 34b and a non-magnetic metallic body 34a is stuck by setting the metallic body 34a side as the sticking surface to the pole 23a in the pole 23a in the same way. Subsequently, to the peripheral edge part of the frame 25, a diaphragm 26 is stuck, and also, to the back part of the plate 23, a cancel magnet 31 is stuck, and the side face part and the back part of these magnetic circuits are covered with a shield cover 32.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は各種音響機器および映像機器に使用される低漏
洩磁束型スピーカに関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a low leakage flux type speaker used in various audio equipment and video equipment.

従来の技術 従来のこの種の低漏洩磁束型スピーカは第2図に示すよ
うな構成であった。すなわち、主マグネット1を上部プ
レート2と下部プレート3によりはさみ込んで構成され
た磁気回路4を一体化して樹脂によりモールド成形して
構成されたフレーム5の周縁部に振動板6を接着し、こ
の振動板6を駆動させるためのボイスコイル7をその中
間部をダンパー8にて中心保持し、磁気ギャップ9には
まり込むように結合し、振動板6のボイスコイル7との
結合部の表面にダストキャップ10を接着してスピーカ
本体を構成していた。さらに、下部プレート3の背面部
に主マグネット1と逆方向に着磁されたキャンセルマグ
ネット11とこれらの磁気回路4の側面部と背面部とを
被うシールドカバー12により構成されていた。
2. Description of the Related Art A conventional low leakage magnetic flux type speaker of this type has a configuration as shown in FIG. That is, a diaphragm 6 is bonded to the periphery of a frame 5, which is constructed by integrating a magnetic circuit 4 formed by sandwiching a main magnet 1 between an upper plate 2 and a lower plate 3 and molded with resin. A voice coil 7 for driving the diaphragm 6 is centrally held at its middle part by a damper 8, and is coupled so as to fit into the magnetic gap 9, and dust is removed from the surface of the coupling part of the diaphragm 6 and the voice coil 7. The speaker body was constructed by bonding the cap 10. Further, the lower plate 3 was composed of a canceling magnet 11 magnetized in the opposite direction to the main magnet 1 on the back side thereof, and a shield cover 12 covering the side and back sides of these magnetic circuits 4.

発明が解決しようとする課題 しかしながら、従来のこの種の低漏洩磁束型スビー力は
、キャンセルマグネット11とシールドカバー12の効
果により磁気回路4からの漏洩磁束を低減させているの
であるが、この場合シールドカバー12の形状により、
スピーカ磁気回路側面部と背面部に関しては有効である
が、スピーカ前面部に対しては、漏洩磁束をシールドす
る部品がないため多少の漏洩磁束が発生し、この漏洩磁
束に対する要求レベルが非常に厳しい映像機器に対して
は使用不可能になるという問題点を有していた。
Problems to be Solved by the Invention However, in this type of conventional low-leakage magnetic flux type Subie force, the leakage magnetic flux from the magnetic circuit 4 is reduced by the effects of the canceling magnet 11 and the shield cover 12; Depending on the shape of the shield cover 12,
This is effective for the side and rear parts of the magnetic circuit of the speaker, but some leakage magnetic flux occurs in the front part of the speaker because there are no parts to shield leakage magnetic flux, and the required level for this leakage magnetic flux is extremely strict. This has the problem that it cannot be used for video equipment.

本発明は、このような従来の問題点を解消し、漏洩磁束
に対して非常に優れた性能を有する低漏洩磁束型スビー
がを提供することを目的とするものである。
It is an object of the present invention to solve these conventional problems and provide a low leakage magnetic flux type subie that has excellent performance against leakage magnetic flux.

課題を解決するための手段 上記課題を解決するために本発明は、樹脂フレームと一
体化してモールド成形された磁気回路の上部プレート前
面部と下部プレートのセンターボール前面部に磁性金属
体と非磁性金属体からなる積層構造体を非磁性金属体側
を接着面として接着し、この磁性金属体により通常漏洩
磁束が非常に多く発生するスピーカ前面方向をシールド
させ、外部への漏洩磁束を低減させる構成としたもので
ある。
Means for Solving the Problems In order to solve the above problems, the present invention provides magnetic metal bodies and non-magnetic materials on the front surface of the upper plate and the front surface of the center ball of the lower plate of the magnetic circuit, which are integrally molded with the resin frame. A laminated structure made of metal bodies is bonded with the non-magnetic metal side as the adhesive surface, and the magnetic metal body shields the front side of the speaker where a large amount of leakage magnetic flux normally occurs, thereby reducing leakage magnetic flux to the outside. This is what I did.

作用 上記の構成とすることで、従来のキャンセルマグネット
とシールドカバーによるスピーカ磁気回路の側面部およ
び背面部への磁気シールド効果に加え、前面部への漏洩
磁束に対しても、上部プレート前面と下部プレートのセ
ンターボール前面に配置され、しかも非磁性金属体によ
り距離を設けられた磁性金属体よりなるプレートにより
磁気シールドされ、外部への漏洩磁束は大幅に低減され
る。
Effect With the above configuration, in addition to the magnetic shielding effect of the conventional canceling magnet and shield cover on the side and rear parts of the speaker magnetic circuit, the upper plate front and lower part also prevent magnetic flux leakage to the front part. Magnetic shielding is provided by a plate made of a magnetic metal body placed in front of the center ball of the plate and separated by a non-magnetic metal body, and leakage of magnetic flux to the outside is significantly reduced.

実施例 以下、本発明の一実施例の低漏洩磁束型スピーカについ
て、図面を参照して説明する。第1図に示すように主マ
グネット21を上部プレート22と下部プレート23に
よりはさみ込んで構成された磁気回路24を一体化して
樹脂によりモールド成形して構成されたフレーム25の
上部プレート22の前面に鉄等の磁性金属体33bとア
ルミ等の非磁性金属体33aよりなるシールド用積層プ
レート33を上部プレート22から直接磁束が伝わらな
いように、非磁性金属体33 a 側を上部プレート2
2への接着面として接着し、また下部プレート23のセ
ンターボール23aの前面には同様に磁性金属体34b
と非磁性金属体34aよりなるシールド用積層プレート
34をセンターボール23aから直接磁束が伝わらない
ように、非磁性金属体34a側をセンターボール23a
への接着面として接着し低漏洩磁束対策を施した筐体を
得ている。そして前記筐体のフレーム25の周縁部に振
動板26を接着し、この振動板26を駆動させるための
ボイスコイル27をその中間部をダンパー28にて中心
保持し、磁気ギャップ29にはまり込むように結合し、
振動板26のボイスコイル27との結合部の表面にダス
トキャップ30を接着してスピーカ本体として構成して
いる。さらに下部プレート23の背面部に主マグネット
21と逆方向に着磁されたキャンセルマグネット31と
、これらの磁気回路の側面部と背面部を被うシールドカ
バー32により構成している。
EXAMPLE Hereinafter, a low leakage flux type speaker according to an example of the present invention will be described with reference to the drawings. As shown in FIG. 1, a magnetic circuit 24 formed by sandwiching a main magnet 21 between an upper plate 22 and a lower plate 23 is attached to the front surface of the upper plate 22 of a frame 25 formed by integrating the magnetic circuit 24 and molding it with resin. The shield laminated plate 33 consisting of a magnetic metal body 33b such as iron and a non-magnetic metal body 33a such as aluminum is placed so that the non-magnetic metal body 33a side is connected to the upper plate 2 so that magnetic flux is not directly transmitted from the upper plate 22.
Similarly, a magnetic metal body 34b is attached to the front surface of the center ball 23a of the lower plate 23.
The non-magnetic metal body 34a side is connected to the center ball 23a so that the magnetic flux is not directly transmitted from the center ball 23a.
The casing is bonded as an adhesive surface to provide a low leakage magnetic flux countermeasure. A diaphragm 26 is bonded to the peripheral edge of the frame 25 of the casing, and a voice coil 27 for driving the diaphragm 26 is held at its center by a damper 28 so as to fit into the magnetic gap 29. combined with
A dust cap 30 is adhered to the surface of the connecting portion of the diaphragm 26 to the voice coil 27 to form a speaker body. Further, the lower plate 23 includes a canceling magnet 31 magnetized in the opposite direction to the main magnet 21 on the back side thereof, and a shield cover 32 covering the side and back sides of these magnetic circuits.

このようにすることで、通常シールドする部品がないた
め、漏洩磁束が多く発生するスピーカ前面方向に対して
も、上部プレート22の前面と下部プレート23のセン
ターボール23aの前面に非磁性金属体33a、34a
により距離を設けて配置された磁性金属体33b、34
bよりなるシールド用積層プレート33と34により磁
気シールドされ、スピーカ前面方向への漏洩磁束は大幅
に低減される。
By doing this, since there are no parts to normally shield, the non-magnetic metal body 33a is provided on the front surface of the upper plate 22 and the front surface of the center ball 23a of the lower plate 23, even in the front direction of the speaker where a lot of leakage magnetic flux occurs. , 34a
Magnetic metal bodies 33b, 34 arranged at a distance from each other
Magnetic shielding is provided by the shielding laminated plates 33 and 34 made up of shielding plates 33 and 34, and leakage magnetic flux toward the front of the speaker is significantly reduced.

発明の効果 以上のように本発明は、従来のキャンセルマグネットと
シールドカバーによるスピーカ磁気回路の側面方向およ
び背面方向に対する磁気シールド効果に加え、上部プレ
ートの前面方向と、下部プレートのセンターボールの前
面方向に、それぞれ非磁性金属体側こより距離を設けて
配置された磁性金属体よりなるシールド用積層プレート
によりスピー力磁気回路の前面方向に対する磁気シール
ドも実施できるため、従来にない超低漏洩磁束型スピー
カを実現できる。
Effects of the Invention As described above, the present invention provides magnetic shielding effects in the side and rear directions of the speaker magnetic circuit using the conventional canceling magnet and shield cover, as well as in the front direction of the upper plate and the front direction of the center ball of the lower plate. In addition, magnetic shielding can be performed in the front direction of the speaker magnetic circuit using shielding laminated plates made of magnetic metal bodies placed at a distance from each side of the non-magnetic metal body, making it possible to create an ultra-low leakage flux type speaker that is unprecedented. realizable.

また、2次的な効果として、上部プレートと下部プレー
トのセンターボールに接着された磁性金属体と非磁性金
属体からなる積層構造体により、磁気回路全体の体積増
加による熱容量の増加、特に熱の発生源であるボイスコ
イルのごく近辺に金属体を追加する構造となっているた
めボイスコイルの放熱性が非常に良好になり高耐入力化
を図ることができる。
In addition, as a secondary effect, due to the laminated structure consisting of magnetic metal and non-magnetic metal adhered to the center balls of the upper and lower plates, the volume of the entire magnetic circuit increases, resulting in an increase in heat capacity. Since the structure is such that a metal body is added very close to the voice coil, which is the source of the noise, the heat dissipation of the voice coil is very good and high input resistance can be achieved.

以上のように本発明は、超低漏洩磁束型でかつ高耐入力
型スピーカを提供することができ、その工業的価値は非
常に大なるものである。
As described above, the present invention can provide an ultra-low leakage magnetic flux type speaker with high input resistance, and its industrial value is extremely large.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例における低漏洩磁束型スピー
カの断面図、第2図は従来の低漏洩磁束型スピーカの断
面図である。 21・・・・・・主マグネット、22・・・・・・上部
プレート、23・・・・・・下部プレート、23a・・
・・・・センターボール、24・・・・・・磁気回路、
25・・・・・・フレーム、26・・・・・・娠動板、
27・・・・・・ボイスコイル、28・・・・・・ダン
パー、29・・・・・・磁気ギャップ、30・・・・・
・ダストキャップ、31・・・・・・キャンセルマグネ
ット、32・・・・・・シールドカバー、33・・・・
・・シールド用積層プレート、33a・・・・・・非磁
性金属体、33b・・・・・・磁性金属体、34・・・
・・・シールド用積層プレート、34a・・・・・・非
磁性金属体、34b・・・・・・磁性金属体。
FIG. 1 is a sectional view of a low leakage magnetic flux type speaker according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional low leakage magnetic flux type speaker. 21... Main magnet, 22... Upper plate, 23... Lower plate, 23a...
... Center ball, 24 ... Magnetic circuit,
25... Frame, 26... Moving plate,
27... Voice coil, 28... Damper, 29... Magnetic gap, 30...
・Dust cap, 31...Cancel magnet, 32...Shield cover, 33...
...Shield laminated plate, 33a...Nonmagnetic metal body, 33b...Magnetic metal body, 34...
...Shield laminated plate, 34a...Nonmagnetic metal body, 34b...Magnetic metal body.

Claims (1)

【特許請求の範囲】[Claims] 主マグネットを上部プレートおよび下部プレートにより
はさみ込んで構成される外磁型の磁気回路を樹脂により
フレームと一体モールド成形した樹脂フレーム付筐体と
、この上部プレート前面部と下部プレートのセンターボ
ール前面部に磁性金属体と非磁性金属体からなる積層構
造体よりなるシールド用プレートを非磁性金属体側を接
着面として接着し、この樹脂フレーム付筺体のフレーム
周縁部に接着された振動板に、前記磁気回路の磁気ギャ
ップにはまり込むボイスコイルを結合し、前記下部プレ
ートの背面部に接着されたキャンセルマグネットと前記
磁気回路を被う形状に配置されたシールドカバーとを有
する低漏洩磁束型スピーカ。
A housing with a resin frame in which an external magnetic type magnetic circuit consisting of a main magnet sandwiched between an upper plate and a lower plate is integrally molded with the frame, and a front part of the upper plate and a center ball front part of the lower plate. A shielding plate made of a laminated structure consisting of a magnetic metal body and a non-magnetic metal body is adhered to the diaphragm, which is adhered to the periphery of the frame of this housing with a resin frame. A low-leakage magnetic flux speaker that combines a voice coil that fits into a magnetic gap of a circuit, has a canceling magnet bonded to the back surface of the lower plate, and a shield cover disposed to cover the magnetic circuit.
JP14048289A 1989-06-01 1989-06-01 Low leakage magnetic flux type speaker Expired - Fee Related JP2638201B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14048289A JP2638201B2 (en) 1989-06-01 1989-06-01 Low leakage magnetic flux type speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14048289A JP2638201B2 (en) 1989-06-01 1989-06-01 Low leakage magnetic flux type speaker

Publications (2)

Publication Number Publication Date
JPH036200A true JPH036200A (en) 1991-01-11
JP2638201B2 JP2638201B2 (en) 1997-08-06

Family

ID=15269635

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14048289A Expired - Fee Related JP2638201B2 (en) 1989-06-01 1989-06-01 Low leakage magnetic flux type speaker

Country Status (1)

Country Link
JP (1) JP2638201B2 (en)

Also Published As

Publication number Publication date
JP2638201B2 (en) 1997-08-06

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