JPH02264599A - Low leakage magnetic flux type speaker - Google Patents

Low leakage magnetic flux type speaker

Info

Publication number
JPH02264599A
JPH02264599A JP8543189A JP8543189A JPH02264599A JP H02264599 A JPH02264599 A JP H02264599A JP 8543189 A JP8543189 A JP 8543189A JP 8543189 A JP8543189 A JP 8543189A JP H02264599 A JPH02264599 A JP H02264599A
Authority
JP
Japan
Prior art keywords
magnetic
frame
speaker
diaphragm
magnet
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
JP8543189A
Other languages
Japanese (ja)
Other versions
JP2778095B2 (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 JP1085431A priority Critical patent/JP2778095B2/en
Publication of JPH02264599A publication Critical patent/JPH02264599A/en
Application granted granted Critical
Publication of JP2778095B2 publication Critical patent/JP2778095B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

Abstract

PURPOSE:To decrease the magnetic fluxes leaking to the outside by using a frame inserted with a resin mixed with the magnetic powder or a magnetic metallic substance. CONSTITUTION:A magnetic circuit 16 is produced by holding a main magnet 13 between an upper plate 14 and a lower plate 15, and a frame 17 is obtained by molding the circuit 16 with the resin mixed with the magnetic powder 25. Then a diaphragm 18 is adhered to the outer circumference of the frame 17. The middle part of a voice coil 19 which drives the diaphragm 18 is held by a damper 20 at the center part so that the coil 19 is fitted into a magnetic gap 21. Then a dust cap 22 is adhered to the surface of the joint part between the diaphragm 18 and the coil 19. In such a constitution, the speaker is obtained. Furthermore a cancel magnet 23 is adhered to the back part of the plate 15 and the circuit 16 is entirely covered with a shielding cover 24. As a result, the frame 17 shields magnetically the magnetic leakage toward the front of the speaker in addition to the magnetic shielding effect secured by the magnet 23 and the cover 24. Thus the leaked magnetic fluxes can extremely be decreased.

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のうち、先ず金属
フレームを用いたスピーカは第3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によりはざみ込んで構成された磁気回路
4に磁性金属体からなるフレーム5を結合し、このフレ
ーム5の外周部に振動板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1oを接着してスピーカとして構成され
ていた。そして、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の全体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 Among conventional low-leakage magnetic flux speakers of this type, a speaker using a metal frame has a structure as shown in FIG. That is, a frame 5 made of a magnetic metal body is coupled to a magnetic circuit 4 formed by sandwiching a main magnet 1 between an upper plate 2 and a lower plate 3, and a diaphragm 6 is bonded to the outer periphery of this frame 5. A voice coil 7 for driving this diaphragm 6 is centrally held at its middle part by a damper 8, and is coupled so as to fit into a magnetic gap 9. A speaker was constructed by adhering a dust cap 1o. Further, it was comprised of a canceling magnet 11 magnetized in the opposite direction to the main magnet 1 on the back side of the lower plate 3, and a shield cover 12 that covered the entirety of these magnetic circuits 4.

次に樹脂フレームを用いた従来のスピーカの例としては
第4図に示すような構成のものがあった。
Next, as an example of a conventional speaker using a resin frame, there is a structure as shown in FIG.

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によりはざみ込み構成された磁気回路4を樹脂によ
りモールド形成して構成されたフレーム5の外周部に振
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として構成されていた。そして、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
気回路全体を被うシールドカバー12により構成されて
いた。
That is, a diaphragm 6 is bonded to the outer periphery of a frame 5, which is made up of a magnetic circuit 4 formed by sandwiching the main magnet 1 between an upper plate 2 and a lower plate 3, and molded with resin. The middle part of the voice coil 7 for driving is held in the center by a damper 8,
It is coupled so as to fit into the magnetic gap 9, and a dust cap 10 is placed on the surface of the coupling portion of the diaphragm 6 and the voice coil 7.
It was constructed as a speaker by gluing it together. Further, it was comprised of a canceling magnet 11 magnetized in the opposite direction to the main magnet 1 on the back side of the lower plate 3, and a shield cover 12 covering the entire magnetic circuit.

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ピーカは
、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、前記のように漏洩対策を施し
ても使用不可能な場合があ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 speaker, the leakage magnetic flux from the magnetic circuit 4 is reduced by the effects of the canceling magnet 11 and the shield cover 12, but this leakage magnetic flux is For video equipment that has very strict requirements, there is a problem in that it may not be usable even if the leakage prevention measures described above are taken.

特に、金属のフレームを用いたスピーカに関しては、樹
脂フレームの場合と比較すると、そのフレーム自身が磁
性金属体であるため主マグネット1からの磁束を上部プ
レート2を通してフレーム5に伝え、このフレーム5の
中を磁束が通り、周縁部の端面より磁束の漏洩が発生し
、映像機器等に悪影響を及ぼすものであった。
In particular, regarding speakers using metal frames, the frame itself is a magnetic metal body, so the magnetic flux from the main magnet 1 is transmitted to the frame 5 through the upper plate 2, and the frame 5 is Magnetic flux passes through the inside, and leakage of magnetic flux occurs from the end face of the periphery, which has an adverse effect on video equipment and the like.

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ピーカ
を提供するものである。
The present invention solves these conventional problems and provides a low-leakage magnetic flux type speaker 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、磁気回路をフレー
ムと一体化してモールド成形している樹脂の中に鉄粉等
の磁性材料による粉末を混入、もしくは磁性金属体より
なる鉄板、鉄網をインサートし、通常漏洩磁束の非常に
多い下部プレートセンターボールからの磁気漏洩を吸収
させ外部への磁気漏洩を低減させる構成としたものであ
る。すなわち磁性材料粉、もしくは、鉄板、鉄網の入っ
た樹脂フレームに磁気シールド効果を持たせた構成とし
たものである。
Means for Solving the Problems In order to solve the above problems, the present invention incorporates powder made of magnetic material such as iron powder into the resin in which the magnetic circuit is integrated with the frame and is molded, or mixes powder made of magnetic material such as iron powder, or The structure is such that an iron plate or iron mesh is inserted to absorb magnetic leakage from the center ball of the lower plate, which normally has a large amount of leakage magnetic flux, and to reduce magnetic leakage to the outside. That is, the structure is such that a resin frame containing magnetic material powder, iron plates, or iron mesh has a magnetic shielding effect.

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磁気シールド効果に加え下部プ
レートのセンターポールから発生するスピーカ前面方向
への磁気漏洩に対しても、樹脂フレームに混入された磁
性材料粉、もしくは、鉄板、鉄網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ことになる。
Effect With the above configuration, in addition to the magnetic shielding effect of the conventional canceling magnet and shield cover, the magnetic material mixed in the resin frame can also be used to prevent magnetic leakage from the center pole of the lower plate toward the front of the speaker. It is magnetically shielded by powder, iron plates, or iron mesh, and leakage 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。先ず、磁性材料による粉末
を混入した例として第1図に示すように主マグネット1
3を上部プレート14と下部プレート15によりはざみ
込んで構成された磁気回路16を磁性材料の粉末25を
混入した樹脂によりモールド成形して構成されたフレー
ム17の外周部に振動板18を接着し、この振動板18
を駆動させるためのボイスコイル19をその中間部をダ
ンパー20にて中心保持し、磁気ギャップ21にはまり
込むように結合し、振動体18のボイスコイル19との
結合部の表面にダストキャップ22を接着してスピーカ
として構成し、さらに下部プレート15の背面部に主マ
グネット13と逆方向に着磁されたキャンセルマグネッ
ト23と、これらの磁気回路16の全体を被うシールド
カバー24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. First, as an example of mixing powder of magnetic material, the main magnet 1 is shown in FIG.
A diaphragm 18 is bonded to the outer periphery of a frame 17, which is constructed by molding a magnetic circuit 16 formed by sandwiching a magnetic circuit 3 between an upper plate 14 and a lower plate 15 using a resin mixed with magnetic material powder 25. , this diaphragm 18
A voice coil 19 for driving the voice coil 19 is centrally held at its middle part by a damper 20, and is coupled so as to fit into the magnetic gap 21, and a dust cap 22 is placed on the surface of the coupling part of the vibrating body 18 with the voice coil 19. The speaker is configured by bonding it together, and further includes a cancellation magnet 23 magnetized in the opposite direction to the main magnet 13 on the back side of the lower plate 15, and a shield cover 24 that covers the entirety of these magnetic circuits 16. .

この実施例の場合は、磁気ギャップ21の効率すなわち
磁束密度を最大限に、またフレーム17からの漏洩磁束
の発生を最少限にするため、フレーム17中の磁性材料
の粉末25を磁気回路16から距離の離れたフレーム1
7の周縁部に集中させて成形している。もちろん、この
場合のように磁性材料の粉末25は特定の部分に偏らせ
ずに全体に均一に混入させてもよい。
In this embodiment, in order to maximize the efficiency of the magnetic gap 21, that is, the magnetic flux density, and to minimize the generation of leakage magnetic flux from the frame 17, the magnetic material powder 25 in the frame 17 is removed from the magnetic circuit 16. Frame 1 at a distance
The molding is concentrated on the periphery of 7. Of course, as in this case, the magnetic material powder 25 may be mixed uniformly throughout the entire body without being concentrated in a specific portion.

次に、磁性金属体からなる鉄板、もしくは鉄網26をイ
ンサート成形した例として第2図を参照しながら説明す
る。前例と同様に樹脂からなるフレーム17を磁気回路
16と一体化してモールド成形する時点で鉄板もしくは
鉄網26を同時にインサート成形する。またこれは鉄板
でなく鉄網でもよい。そしてこのフレーム17に前例と
同様に振動系を組み立て、さらにキャンセルマグネット
23とシールドカバー24と組み立て構成している。
Next, an example in which an iron plate or iron mesh 26 made of a magnetic metal body is insert-molded will be described with reference to FIG. 2. Similar to the previous example, when the frame 17 made of resin is integrated with the magnetic circuit 16 and molded, an iron plate or iron mesh 26 is simultaneously insert-molded. Also, this may be an iron net instead of an iron plate. A vibration system is assembled on this frame 17 in the same manner as in the previous example, and a cancel magnet 23 and a shield cover 24 are further assembled.

このようにすることで、通常磁気漏洩が多い下部プレー
ト15のセンターボールから発生するスピーカの前面方
向への磁気漏洩に対しても、樹脂フレーム17の周縁部
に混入された磁性材料粉やインサートされた鉄板、鉄網
26の磁性金属体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。
By doing this, magnetic material powder mixed in the peripheral edge of the resin frame 17 and magnetic material powder mixed in the insert can be prevented from magnetic leakage toward the front of the speaker, which is generated from the center ball of the lower plate 15 where there is usually a lot of magnetic leakage. Magnetic shielding is provided by the magnetic metal bodies of the iron plate and the iron mesh 26, and leakage of magnetic flux to the outside 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磁気シールド効果に加え、樹脂フ
レームのみならず、その中に混入された磁性材料粉やイ
ンサートされた鉄板、鉄網によっても磁気シールドされ
ているため、従来にない超低磁気漏洩スピーカを提供す
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。
Effects of the Invention As described above, in addition to the magnetic shielding effect of the conventional canceling magnet and shield cover, the present invention also has a magnetic shielding effect not only due to the resin frame but also due to the magnetic material powder mixed therein, the iron plate inserted, and the iron mesh. Because it is magnetically shielded, it is possible to provide an unprecedented ultra-low magnetic leakage speaker, 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
カの構造を示す断面図、第2図は同様に本発明の別の実
施例における低漏洩磁束型スピーカの断面図、第3図は
従来の鉄板フレームタイプの低漏洩磁束型スピーカの断
面図、第4図は従来の樹脂フレームタイプの低漏洩磁束
型スピーカの断面図である。 13・・・・・・主マグネット、14・・・・・・上部
プレート、15・・・・・・下部プレート、16・・・
・・・磁気回路、17・・・・・・フレーム、18・・
・・・・振動板、19・・・・・・ボイスコイル、20
・・・・・・ダンパー、21・・・・・・磁気ギャップ
、22・・・・・・ダストキャップ、23・・・・・・
キャンセルマグネット、24・・・・・・シールドカバ
ー、25・・・・・・磁性材料の粉末、26・・・・・
・鉄板もしくは鉄網。 代理人の氏名 弁理士 粟野重孝 はか1名f3− 主
マク序ソト !4− 上=やプロレート ts−下部プレート 7g−一磁気可訃 17−  フレーム 18−  据璽駿版 19−  ボイスコイル 2o−グンハ0− 21・−v!気¥ペツフゝ 22−  ダスト午イップ′ z3−  キインゼルマグ序ット 築1図 Z5−  磁性8f料の粉入 第 2 図
FIG. 1 is a cross-sectional view showing the structure of a low-leakage magnetic flux type speaker in one embodiment of the present invention, FIG. 2 is a cross-sectional view of a low-leakage magnetic flux type speaker in another embodiment of the present invention, and FIG. FIG. 4 is a cross-sectional view of a conventional low-leakage magnetic flux speaker with an iron plate frame type. FIG. 4 is a cross-sectional view of a conventional low-leakage magnetic flux speaker with a resin frame type. 13... Main magnet, 14... Upper plate, 15... Lower plate, 16...
...Magnetic circuit, 17...Frame, 18...
...Diaphragm, 19...Voice coil, 20
... Damper, 21 ... Magnetic gap, 22 ... Dust cap, 23 ...
Cancellation magnet, 24... Shield cover, 25... Magnetic material powder, 26...
- Iron plate or iron mesh. Agent's name: Patent attorney Shigetaka Awano Haka1 person f3- Lord Makoto Soto! 4- Upper = Ya pro rate ts- Lower plate 7g- One magnetic switch 17- Frame 18- Shunshu version 19- Voice coil 2o- Gunha 0- 21・-v! Air¥Petsup22- Dust cover z3- Kinzer mag installation 1st figure Z5- Magnetic 8F powder powder 2nd figure

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
はざみ込んで構成される外磁型の磁気回路を鉄粉等の磁
性粉を混入した樹脂又は鉄板、鉄網等の磁性金属体をイ
ンサートしたフレームと、このフレームの周縁部に接着
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
むボイスコイルと、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。
An outer magnetic type magnetic circuit consisting of a main magnet sandwiched between an upper plate and a lower plate is made of a frame in which a resin mixed with magnetic powder such as iron powder or a magnetic metal body such as an iron plate or iron mesh is inserted. A voice coil that fits into the magnetic gap of the magnetic circuit on a diaphragm bonded to the periphery of the frame, a canceling magnet bonded to the back surface of the lower plate, and a shield cover arranged to cover the magnetic circuit. A low leakage magnetic flux type speaker having.
JP1085431A 1989-04-04 1989-04-04 Low leakage magnetic flux type speaker Expired - Fee Related JP2778095B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1085431A JP2778095B2 (en) 1989-04-04 1989-04-04 Low leakage magnetic flux type speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1085431A JP2778095B2 (en) 1989-04-04 1989-04-04 Low leakage magnetic flux type speaker

Publications (2)

Publication Number Publication Date
JPH02264599A true JPH02264599A (en) 1990-10-29
JP2778095B2 JP2778095B2 (en) 1998-07-23

Family

ID=13858655

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1085431A Expired - Fee Related JP2778095B2 (en) 1989-04-04 1989-04-04 Low leakage magnetic flux type speaker

Country Status (1)

Country Link
JP (1) JP2778095B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001239210A (en) * 2000-02-29 2001-09-04 Citizen Electronics Co Ltd Multifunction type sounding body
JP2001239211A (en) * 2000-02-29 2001-09-04 Citizen Electronics Co Ltd Multifunction type sounding body and producing method thereof
JP2001245386A (en) * 2000-02-29 2001-09-07 Citizen Electronics Co Ltd Multi-function sounder
JP2003032784A (en) * 2001-07-19 2003-01-31 Matsushita Electric Ind Co Ltd Speaker
KR100485451B1 (en) * 1996-04-04 2005-08-10 스타 마이크로닉스 컴퍼니 리미티드 Electroacoustic transducer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49113624U (en) * 1973-01-22 1974-09-27
JPS61189694U (en) * 1985-05-18 1986-11-26
JPS62193499A (en) * 1986-02-20 1987-08-25 Matsushita Electric Ind Co Ltd Electroacoustic transducer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49113624U (en) * 1973-01-22 1974-09-27
JPS61189694U (en) * 1985-05-18 1986-11-26
JPS62193499A (en) * 1986-02-20 1987-08-25 Matsushita Electric Ind Co Ltd Electroacoustic transducer

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100485451B1 (en) * 1996-04-04 2005-08-10 스타 마이크로닉스 컴퍼니 리미티드 Electroacoustic transducer
JP2001239210A (en) * 2000-02-29 2001-09-04 Citizen Electronics Co Ltd Multifunction type sounding body
JP2001239211A (en) * 2000-02-29 2001-09-04 Citizen Electronics Co Ltd Multifunction type sounding body and producing method thereof
JP2001245386A (en) * 2000-02-29 2001-09-07 Citizen Electronics Co Ltd Multi-function sounder
JP4514273B2 (en) * 2000-02-29 2010-07-28 シチズン電子株式会社 Multi-functional pronunciation body
JP4603124B2 (en) * 2000-02-29 2010-12-22 シチズン電子株式会社 Multi-functional pronunciation body
JP2003032784A (en) * 2001-07-19 2003-01-31 Matsushita Electric Ind Co Ltd Speaker
JP4572490B2 (en) * 2001-07-19 2010-11-04 パナソニック株式会社 Speaker

Also Published As

Publication number Publication date
JP2778095B2 (en) 1998-07-23

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