JP3578245B2 - Electromagnetic sounding body - Google Patents

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JP3578245B2
JP3578245B2 JP29462896A JP29462896A JP3578245B2 JP 3578245 B2 JP3578245 B2 JP 3578245B2 JP 29462896 A JP29462896 A JP 29462896A JP 29462896 A JP29462896 A JP 29462896A JP 3578245 B2 JP3578245 B2 JP 3578245B2
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magnet
case
sounding
peripheral portion
yoke base
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JPH10124067A (en
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雄司 寄
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株式会社シチズン電子
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Description

【発明の属する技術分野】
本発明は、電磁型発音体に関し、特に電磁型発音体の振動板に対する落下等による側面からの外部衝撃によって振動板が塑性変形し特性不良になるのを改良した電磁型発音体に関する。
【０００２】
【従来の技術】
電磁型発音体は近年普及が目覚ましい携帯電話やポケットベルなどペ−ジャ−の呼び出し用に多く用いられている。このような携帯用の機器に用いる場合、落下その他で外部からの強い衝撃を受けることがある。その為、従来から電磁型発音体の振動板が外部衝撃によって大きく変位しないようにするための構造が種々提案されている。
【０００３】
図６は従来の電磁型発音体構造の断面図である。プラスチック材料で成形された放音孔１ａを有する円筒状の発音体ケ−ス１には、外周部を発音体ケ−ス１の内周部に固着された磁性材料からなるヨ−クベ−ス２と、ヨ−クベ−ス２の中央部に設けられた柱状の鉄心３と、ヨ−クベ−ス２の周囲に配置された円筒形マグネット４と、弾性を有する磁性材料からなる振動板５を備え、振動板５はマグネット４と鉄心３とヨ−クベ−ス２とで磁気回路を形成している。又、マグネット４の外周部は発音体ケ−ス１の内周部との間に殆ど隙間が無く取り付けられている。振動板５はマグネット４に吸着固定され、振動板５の中心部には鉄心３との磁気的結合を密にすると共に振動質量を高めるために鉄片９が取り付けられている。又、振動板５を駆動するために鉄心３の周囲に配置された励磁コイル６と、励磁コイル６の端末を外部に導くために基板７に設けられた２つの外部接続端子８ａ、８ｂを有している。そして、振動板５は外部接続端子８ａ、８ｂに電気信号を印加して電磁的に駆動される。
【０００４】
発音体ケ−ス１の放音孔１ａ側と振動板５とでできる空間は振動空間として共鳴室１０を形成している。
強い外部衝撃が加わると、振動板５はマグネット４に吸着固定であるために、マグネット４から離脱し、又、極薄の板材料からなる振動板５が変形したり、振動板５にスポット溶接されている鉄片９が脱落する恐れがある。従って、この従来例では共鳴室１０の発音体ケ−ス１の内周部にケ−ス突き出し部１ｃを設けて、振動板５の外周部が共鳴室１０の方向に許容範囲を越えて移動しないように規制されている。
【０００５】
図７は図６に示す従来の電磁型発音体の発音体ケ−ス１の内周部に設けたケ−ス突き出し部１ｃと振動板及びマグネットとの取付構造の要部拡大断面図である。振動板５はその外周部がケ−ス突き出し部１ｃで規制されているために外部衝撃によって移動し、マグネットより離脱することはない。しかし、この従来例では振動板５の中央部の移動が規制されていないために、強い外部衝撃に対しては振動板５の防護としては不十分であった。
【０００６】
そこで、上記従来例の欠点を改良するものとして特開平６−１６５２９３号「電気音響変換器」に外部衝撃から振動板５を防護する構造が提案されている。図８は特開平６−１６５２９３号に開示の電磁型発音体の構造の断面図である。図８において図６と同じ符号は同じ機能作用をするものである。
【０００７】
図８に示す電磁型発音体の構造においては振動板５の一方面側に形成された共鳴室１０の内壁部に、振動板５の中央部に取り付けられた鉄片１０の部分で外部衝撃による前記振動板の移動許容範囲を規制する移動制限手段を設けたものである。即ち、共鳴室１０の音を外部に導く放音筒を長くして放音孔突き出し部１ｂを設けて移動制限手段として用い、放音孔突き出し部１ｂの端部と鉄片９の間隔を通常の振動許容範囲と同等か若しくはそれより僅か大きく設定したものである。又、振動板５の外周部の移動規制については、図６の場合と同様に発音体ケ−ス１の内周部に突き出し部１ｃを設けて振動板５の外周部が共鳴室１０の方向に許容範囲を越えて移動しないように規制したものである。
【０００８】
【発明が解決しようとする課題】
しかしながら、特開平６−１６５２９３号に開示の電磁型発音体の構造においては、振動板５に対する垂直方向からの外部衝撃に対しては振動板５の移動を一定許容範囲に規制するという点では効果があるが、振動板５に対する側面からの強い外部衝撃を受けた場合、図６、図８に示した上記いずれの従来例においても振動板５を支持している円筒状のマグネット４の外周部と発音体ケ−ス１の内周部との間に殆ど隙間がないために、外部衝撃力が図６では発音体ケ−ス１とマグネット４を経て、又、図８では発音体ケ−ス１から直接振動板５に伝わることで、振動板５が大きく変位して塑性変形し、振動特性が不良になるという問題があった。
【０００９】
本発明は、上記の問題点に鑑みなされたもので、その目的は、振動板に対する側面からの強い外部衝撃を受けても、その衝撃力を柔らげて振動板の塑性変形が発生しないようにして、安定した振動特性の電磁型発音体を提供するものである。
【００１０】
【課題を解決するための手段】
上記目的を達成するために、本発明の電磁型発音体においては、放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記発音体ケ−スの内周部にケース突き出し部を設け、前記マグネットは前記ケース突き出し部に前記マグネットの上面を突き当てて配置されており、前記マグネットの外周部に段部を形成して、前記マグネットの外周部と前記発音体ケ−スの内周部との間に隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とするものである。
【００１２】
更に、本発明の電磁型発音体においては、放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記マグネットの外周部に段部を形成し、且つ前記マグネットの段部は前記マグネットの外周部に沿って部分的に複数箇所に設けて、前記マグネットの外周部と前記発音体ケ−スの内周部との間に隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とするものである。
【００１３】
又、本発明の電磁型発音体においては、放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記発音体ケ−スの内周部にケース突き出し部を設け、前記マグネットは前記ケース突き出し部に前記マグネットの上面を突き当てて配置されており、前記発音体ケ−スの内周部に段部を形成して、前記マグネットの外周部と前記発音体ケ−スの内周部との間に隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とするものである。
【００１４】
又、本発明の電磁型発音体においては、放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記発音体ケ−スの内周部に段部を形成し、且つ前記発音体ケ−スの内周部の段部は前記発音体ケ−スの内周部に沿って部分的に複数箇所に設けて、前記マグネットの外周部と前記発音体ケ−スの内周部との間に隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とするものである。
【００１５】
又、本発明の電磁型発音体においては、放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記発音体ケ−スの内周部にケース突き出し部を設け、前記マグネットは前記ケース突き出し部に前記マグネットの上面を突き当てて配置されており、前記マグネットの外周部と前記発音体ケ−スの内周部との間に緩衝部材を全周又は部分的に複数箇所に介在させて隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とするものである。
【００１６】
【発明の実施の形態】
以下本発明の実施の形態を図面に示す実施例に基いて説明する。尚、図において、従来技術と同一部材は同一符号で示し、説明を省略する。図１は本発明の第１の実施例の電磁型発音体の要部の構造を示す断面図である。又、図２は図１における振動板の取付け部分（図１において点線で囲んだ部分）の要部拡大断面図である。
【００１７】
円筒状の発音体ケ−ス１は振動板５の中央部に取り付けられた鉄片９部分で振動板５と垂直方向の外部衝撃による振動板５の移動許容範囲を規制する移動制限部材として、共鳴室１０の音を外気に導く放音孔突き出し部１ｂを長くして、放音孔突き出し部１ｂの端部と鉄片９の間隔を通常の振動許容範囲と同等か若しくはそれより僅か大きく設定している。又、発音体ケ−ス１の共鳴室１０の内壁部に振動板５の外周部の移動を許容範囲に制限するケ−ス突き出し部１ｃを設けている。又、円筒状のマグネット４には振動板５を境に共鳴室１０と反対側の外周部に沿って段部４ａを形成して、発音体ケ−ス１の内周部との間に段部４ａで出来る隙間１１を設けたものである。この隙間１１の距離は０．６ｍｍ程度である。
【００１８】
この様な構成によって、第１の実施例においては、振動板５に対する垂直方向からの外部衝撃に対しては、振動板５の中央部の変位は放音孔突き出し部１ｂで規制し、又、振動板５の外周部の変位はケ−ス突き出し部１ｃで規制することができる。
【００１９】
又、一方、振動板５に対する側面からの外部衝撃に対しては、隙間１１によって外部衝撃力が一旦プラスチック製の発音体ケ−ス１で吸収される。そのために、従来例のように外部衝撃力が発音体ケ−ス１及びマグネット４を経て、又は、発音体ケ−ス１から直接振動板５に伝わることがないので衝撃力は隙間１１が存在することにより柔らげられ、振動板５の変位が小さく塑性変形を生ずることがなく安定した振動特性を維持することができる。
【００２０】
尚、上記の実施例においては、マグネット４の外周部に沿って全周に段部４ａを設けたが、この段部はマグネット４の外周部に沿って部分的に複数箇所に設けることもできる。
【００２１】
図３は本発明の第２の実施例を示すもので、振動板の取付け部分の要部拡大断面図である。第２の実施例においては、振動板５を境に共鳴室１０と反対側のマグネット４の外周部に沿って発音体ケ−ス１の内周部に段部１ｄを形成して、発音体ケ−ス１との間に隙間１１を設けたものである。 第２の実施例では段部１ｄはプラスチック製の発音体ケ−ス１に形成しているので第１の実施例のマグネット４の段部４ａに比べると射出成形で簡単に作ることができる。又、段部１ｄがプラスチック材料でできていることから衝撃力の吸収効果を大きくすることができる。
【００２２】
図４は第２の実施例の変形例を示すもので、発音体ケ−ス１を内側から見た平面図である。図４における発音体ケ−ス１は、第２の実施例の場合の段部１ｄを発音体ケ−ス１の内周部に沿って部分的に複数箇所に設けたものである。この実施例ではマグネット４を発音体ケ−ス１の段部１ｄで部分的に保持しているために、第２の実施例より衝撃力の吸収効果を更に大きくすることができる。
【００２３】
図５は本発明の第３の実施例で、振動板の取付け部分の要部拡大断面図である。第３の実施例においては、マグネット４の外周部と発音体ケ−ス１の内周部との間に全周又は複数箇所に緩衝部材１２を介在させて隙間を設けたものである。緩衝部材１２としては弾性を有する材料例えばゴムやプラスチックやシリコン等の接着剤を使用することによって外部衝撃の吸収効果を大きくし、振動板５の塑性変形を防止することができる。
【００２４】
【発明の効果】
以上述べたことから明らかなように、本発明によれば、振動板を保持しているマグネットの外周部と発音体ケ−スの内周部との間に隙間を設けることによって、振動板が側面から強い外部衝撃を受けた場合でも、衝撃力を吸収して振動板の塑性変形を防止し、安定した振動特性を有する電磁型発音体を得ることができる。
【００２５】
又、マグネットの外周部と発音体ケ−スの内周部との間の隙間はマグネットの外周部又は発音体ケ−スの内周部に段部を設けることにより得ることができるので、簡単な構造で振動板の側面からの衝撃力を吸収して振動板の塑性変形を防止し、安定した振動特性を有する電磁型発音体を得ることができる。
【００２６】
【図面の簡単な説明】
【図１】本発明の第１の実施例の要部の構造を示す断面図である。
【図２】図１における振動板の取付け部分の要部拡大断面図である。
【図３】本発明の第２の実施例の振動板の取付け部分の要部拡大断面図である。
【図４】第２の実施例の変形例としての発音体ケ−ス１を内側から見た平面図である。
【図５】本発明の第３の実施例の振動板の取付け部分の要部拡大断面図である。
【図６】従来例の電磁型発音体構造の断面図である。
【図７】図６の振動板及びマグネットの取付構造の要部拡大断面図である。
【図８】他の従来例の電磁型発音体構造の断面図である。
【符号の説明】
１ 発音体ケ−ス
１ａ 放音孔
１ｂ 放音孔突き出し部
１ｃ ケ−ス突き出し部
１ｄ 発音体ケース内周部の段部
２ ヨ−クベ−ス
３ 鉄心
４ マグネット
４ａ マグネット外周部の段部
５ 振動板
６ 励磁コイル
７ 基板
８ａ、８ｂ 外部接続端子
９ 鉄片
１０ 共鳴室
１１ 隙間
１２ 緩衝部材TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic sounding body, and more particularly, to an electromagnetic sounding body improved in that the vibration plate is plastically deformed due to an external impact from a side surface due to a drop of the electromagnetic sound body to the vibration plate and the like, resulting in poor characteristics.
[0002]
[Prior art]
2. Description of the Related Art Electromagnetic sounding bodies have been widely used for calling pagers such as mobile phones and pagers, which have become remarkably popular in recent years. When used in such a portable device, a strong external shock may be applied when the device is dropped or otherwise. Therefore, various structures for preventing the diaphragm of the electromagnetic sounding body from being largely displaced by an external impact have been conventionally proposed.
[0003]
FIG. 6 is a cross-sectional view of a conventional electromagnetic sounding body structure. A cylindrical speaker case 1 having a sound emission hole 1a formed of a plastic material has a yoke base made of a magnetic material having an outer peripheral portion fixed to an inner peripheral portion of the speaker case 1. 2, a columnar iron core 3 provided at the center of the yoke base 2, a cylindrical magnet 4 disposed around the yoke base 2, and a diaphragm 5 made of an elastic magnetic material. The diaphragm 5 forms a magnetic circuit with the magnet 4, the iron core 3, and the yoke base 2. Further, the outer peripheral portion of the magnet 4 is attached to the inner peripheral portion of the sounding body case 1 with almost no gap. The vibration plate 5 is fixed by suction to the magnet 4, and an iron piece 9 is attached to the center of the vibration plate 5 to increase the magnetic coupling with the iron core 3 and increase the vibration mass. It also has an exciting coil 6 arranged around the iron core 3 for driving the diaphragm 5 and two external connection terminals 8a and 8b provided on the substrate 7 for guiding the terminals of the exciting coil 6 to the outside. are doing. Then, the diaphragm 5 is electromagnetically driven by applying an electric signal to the external connection terminals 8a and 8b.
[0004]
The space formed between the sound emission hole 1a of the sounding body case 1 and the diaphragm 5 forms a resonance chamber 10 as a vibration space.
When a strong external impact is applied, the diaphragm 5 is detached from the magnet 4 because it is attracted and fixed to the magnet 4, and the diaphragm 5 made of an extremely thin plate material is deformed or spot-welded to the diaphragm 5. There is a possibility that the iron piece 9 that has been dropped may fall off. Therefore, in this conventional example, a case protruding portion 1c is provided on the inner peripheral portion of the sounding body case 1 of the resonance chamber 10, and the outer peripheral portion of the diaphragm 5 moves beyond the allowable range in the direction of the resonance chamber 10. Not regulated.
[0005]
FIG. 7 is an enlarged sectional view of a main part of the mounting structure of the case projecting portion 1c provided on the inner peripheral portion of the sounding body case 1 of the conventional electromagnetic sounding body shown in FIG. . Since the outer periphery of the diaphragm 5 is regulated by the case protrusion 1c, the diaphragm 5 moves due to an external impact and does not separate from the magnet. However, in this conventional example, since the movement of the central portion of the diaphragm 5 is not restricted, the diaphragm 5 is not sufficiently protected against a strong external impact.
[0006]
In order to solve the above-mentioned drawbacks of the prior art, Japanese Patent Laid-Open No. 6-165293 "Electroacoustic transducer" proposes a structure for protecting the diaphragm 5 from external impact. FIG. 8 is a cross-sectional view of the structure of the electromagnetic sounding body disclosed in JP-A-6-165293. 8, the same reference numerals as those in FIG. 6 perform the same function and operation.
[0007]
In the structure of the electromagnetic sounding body shown in FIG. 8, the iron piece 10 attached to the center part of the diaphragm 5 is attached to the inner wall of the resonance chamber 10 formed on one side of the diaphragm 5 due to an external impact. A movement restricting means for restricting a movement allowable range of the diaphragm is provided. That is, the sound emission tube that guides the sound of the resonance chamber 10 to the outside is lengthened to provide the sound emission hole protrusion 1b, which is used as a movement restricting means. This is set to be equal to or slightly larger than the allowable vibration range. The movement of the outer peripheral portion of the diaphragm 5 is restricted in the same manner as in FIG. 6 by providing a protruding portion 1c on the inner peripheral portion of the sounding case 1 so that the outer peripheral portion of the diaphragm 5 is directed toward the resonance chamber 10. Is restricted so as not to move beyond the allowable range.
[0008]
[Problems to be solved by the invention]
However, the structure of the electromagnetic sounding body disclosed in Japanese Patent Application Laid-Open No. 6-165293 is effective in that the movement of the diaphragm 5 is restricted to a certain allowable range against an external impact from the direction perpendicular to the diaphragm 5. However, when a strong external impact is applied to the diaphragm 5 from the side surface, the outer peripheral portion of the cylindrical magnet 4 supporting the diaphragm 5 in any of the conventional examples shown in FIGS. Since there is almost no gap between the sound generator case 1 and the inner periphery thereof, the external impact force passes through the sound generator case 1 and the magnet 4 in FIG. 6, and in FIG. There is a problem that the vibration is directly transmitted to the diaphragm 5 from the source 1 and the diaphragm 5 is largely displaced and plastically deformed, resulting in a poor vibration characteristic.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to soften the impact force even when a strong external impact is applied to the diaphragm from the side surface so that the diaphragm is not plastically deformed. Thus, an electromagnetic sounding body having stable vibration characteristics is provided.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, in the electromagnetic sounding body of the present invention, a sounding case having a sound emission hole, a yoke base made of a magnetic material, and a central portion of the yoke base are provided. And a magnet disposed on the outer periphery of the yoke base, and a magnetic circuit formed by the magnet, the iron core and the yoke base inside the sounding case. As formed, in an electromagnetic sounding body having a diaphragm disposed on the magnet, an excitation coil disposed around the iron core, and an external connection terminal for guiding a terminal of the excitation coil to the outside. A case protruding portion is provided on an inner peripheral portion of the sounding body case, and the magnet is arranged by abutting an upper surface of the magnet on the case protruding portion, and a step is formed on an outer peripheral portion of the magnet. Te, said the magnet The sounding body and the outer peripheral portion of the Ke - a gap between the inner peripheral portion of the scan, in which the diaphragm by an external impact, characterized in that to avoid plastic deformation.
[0012]
Further, in the electromagnetic sounding body of the present invention, a sounding case having a sound emitting hole, a yoke base made of a magnetic material, and an iron core provided at a central portion of the yoke base are provided. A magnet arranged on the outer periphery of the yoke base and a magnet circuit inside the sounding case, the magnet, the iron core and the yoke base forming a magnetic circuit. In an electromagnetic sounding body having a diaphragm arranged on a magnet, an excitation coil arranged around the iron core, and an external connection terminal for guiding a terminal of the excitation coil to the outside, an outer peripheral portion of the magnet A step is formed on the magnet , and the step of the magnet is partially provided at a plurality of positions along the outer periphery of the magnet, so that a step is formed between the outer periphery of the magnet and the inner periphery of the sounding case. A gap is provided in the Kinematic plate is characterized in that to avoid plastic deformation.
[0013]
Further, in the electromagnetic sounding body of the present invention, a sounding case having a sound emitting hole, a yoke base made of a magnetic material, and an iron core provided at a central portion of the yoke base. A magnet arranged on the outer periphery of the yoke base and a magnet circuit inside the sounding case, the magnet, the iron core and the yoke base forming a magnetic circuit. An electromagnetic sounding body including a diaphragm arranged on a magnet, an exciting coil arranged around the iron core, and an external connection terminal for guiding a terminal of the exciting coil to the outside. A case protruding portion is provided on an inner peripheral portion of the housing, and the magnet is arranged by abutting an upper surface of the magnet against the case protruding portion, and a step is formed on an inner peripheral portion of the sounding case. the outer peripheral portion of the magnet pronunciation Ke - a gap between the inner peripheral portion of the scan, in which the diaphragm by an external impact, characterized in that to avoid plastic deformation.
[0014]
Further, in the electromagnetic sounding body of the present invention, a sounding case having a sound emitting hole, a yoke base made of a magnetic material, and an iron core provided at a central portion of the yoke base. A magnet arranged on the outer periphery of the yoke base and a magnet circuit inside the sounding case, the magnet, the iron core and the yoke base forming a magnetic circuit. An electromagnetic sounding body including a diaphragm arranged on a magnet, an exciting coil arranged around the iron core, and an external connection terminal for guiding a terminal of the exciting coil to the outside. A step is formed on the inner periphery of the speaker case , and the steps of the inner periphery of the sounding case are partially provided at a plurality of positions along the inner periphery of the sounding case. A gap is provided between the outer peripheral portion of the magnet and the inner peripheral portion of the sounding body case to prevent external impact. Thus it is characterized in that the diaphragm is prevented from plastic deformation.
[0015]
Further, in the electromagnetic sounding body of the present invention, a sounding case having a sound emitting hole, a yoke base made of a magnetic material, and an iron core provided at a central portion of the yoke base. A magnet arranged on the outer periphery of the yoke base and a magnet circuit inside the sounding case, the magnet, the iron core and the yoke base forming a magnetic circuit. a vibration plate disposed on the magnet, an exciting coil disposed around the core, the electromagnetic sound generator having an external connecting terminal for leading the terminals of the excitation coil to the outside, the sounding body Ke - A case protruding portion is provided on an inner peripheral portion of the case, and the magnet is disposed by abutting an upper surface of the magnet on the case protruding portion. Between the entire circumference of the cushioning member or Min to be interposed at a plurality of locations by a gap, in which the diaphragm by an external impact, characterized in that to avoid plastic deformation.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. In the drawings, the same members as those of the related art are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a sectional view showing a structure of a main part of an electromagnetic sounding body according to a first embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main part of a portion where the diaphragm is attached in FIG. 1 (a portion surrounded by a dotted line in FIG. 1).
[0017]
The cylindrical sounding body case 1 is a resonating member for restricting the allowable range of movement of the diaphragm 5 due to an external shock perpendicular to the diaphragm 5 by an iron piece 9 attached to the center of the diaphragm 5 as a resonance member. The sound emission hole protrusion 1b for guiding the sound of the chamber 10 to the outside air is lengthened, and the distance between the end of the sound emission hole protrusion 1b and the iron piece 9 is set to be equal to or slightly larger than the normal vibration allowable range. I have. A case projection 1c is provided on the inner wall of the resonance chamber 10 of the sounding body case 1 to limit the movement of the outer periphery of the diaphragm 5 to an allowable range. Also, a step 4a is formed on the cylindrical magnet 4 along the outer periphery opposite to the resonance chamber 10 with the diaphragm 5 as a boundary, and a step is formed between the magnet 4 and the inner periphery of the sounding body case 1. A gap 11 formed in the portion 4a is provided. The distance of the gap 11 is about 0.6 mm.
[0018]
With such a configuration, in the first embodiment, the displacement of the central portion of the diaphragm 5 against the external impact from the vertical direction with respect to the diaphragm 5 is restricted by the sound emission hole protrusion 1b. The displacement of the outer peripheral portion of the diaphragm 5 can be regulated by the case protrusion 1c.
[0019]
On the other hand, against the external impact from the side surface to the diaphragm 5, the external impact force is temporarily absorbed by the plastic sounding case 1 by the gap 11. For this reason, since the external impact force is not transmitted to the diaphragm 5 through the sounding case 1 and the magnet 4 or directly from the sounding case 1 as in the conventional example, the gap force 11 exists. By doing so, the diaphragm 5 is softened, the displacement of the diaphragm 5 is small, and a stable vibration characteristic can be maintained without causing plastic deformation.
[0020]
In the above-described embodiment, the step portion 4a is provided on the entire circumference along the outer peripheral portion of the magnet 4, but this step portion may be provided at a plurality of portions along the outer peripheral portion of the magnet 4. .
[0021]
FIG. 3 shows a second embodiment of the present invention, and is an enlarged sectional view of a main part of a mounting portion of a diaphragm. In the second embodiment, a step portion 1d is formed on the inner peripheral portion of the sounding case 1 along the outer peripheral portion of the magnet 4 on the opposite side of the resonance chamber 10 with the diaphragm 5 as a boundary. A gap 11 is provided between the casing and the case 1. In the second embodiment, since the step 1d is formed in the plastic case 1 made of plastic, it can be easily formed by injection molding as compared with the step 4a of the magnet 4 of the first embodiment. Further, since the step portion 1d is made of a plastic material, the effect of absorbing the impact force can be increased.
[0022]
FIG. 4 shows a modification of the second embodiment, and is a plan view of the sounding case 1 as viewed from the inside. The sounding body case 1 in FIG. 4 has a plurality of steps 1d of the second embodiment provided partially along the inner peripheral portion of the sounding case 1. In this embodiment, since the magnet 4 is partially held by the step 1d of the sounding body case 1, the effect of absorbing the impact force can be further increased as compared with the second embodiment.
[0023]
FIG. 5 is a third embodiment of the present invention, and is an enlarged sectional view of a main part of a mounting portion of a diaphragm. In the third embodiment, a gap is provided between the outer peripheral portion of the magnet 4 and the inner peripheral portion of the sounding case 1 with a buffer member 12 interposed at all or a plurality of locations. By using an elastic material, for example, an adhesive such as rubber, plastic, or silicon, as the cushioning member 12, the effect of absorbing external shocks can be increased, and plastic deformation of the diaphragm 5 can be prevented.
[0024]
【The invention's effect】
As is apparent from the above description, according to the present invention, the diaphragm is provided by providing a gap between the outer peripheral portion of the magnet holding the diaphragm and the inner peripheral portion of the sounding case. Even when a strong external impact is received from the side, the impact force is absorbed to prevent the plastic deformation of the diaphragm, and an electromagnetic sounding body having stable vibration characteristics can be obtained.
[0025]
Further, the gap between the outer periphery of the magnet and the inner periphery of the sounding case can be obtained by providing a step on the outer periphery of the magnet or the inner periphery of the sounding case. With such a simple structure, it is possible to prevent the plastic deformation of the diaphragm by absorbing the impact force from the side surface of the diaphragm and obtain an electromagnetic sounding body having stable vibration characteristics.
[0026]
[Brief description of the drawings]
FIG. 1 is a sectional view showing a structure of a main part of a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a main part of a mounting portion of a diaphragm in FIG.
FIG. 3 is an enlarged sectional view of a main part of a mounting portion of a diaphragm according to a second embodiment of the present invention.
FIG. 4 is a plan view of a sounding body case 1 as a modification of the second embodiment as viewed from the inside.
FIG. 5 is an enlarged sectional view of a main part of a mounting portion of a diaphragm according to a third embodiment of the present invention.
FIG. 6 is a cross-sectional view of a conventional electromagnetic sounding body structure.
FIG. 7 is an enlarged sectional view of a main part of the mounting structure of the diaphragm and the magnet in FIG. 6;
FIG. 8 is a cross-sectional view of another conventional electromagnetic sounding body structure.
[Explanation of symbols]
Reference Signs List 1 sounding case 1a sound emitting hole 1b sound emitting hole protruding portion 1c case protruding portion 1d stepped portion of inner peripheral portion of sounding device case 2 yoke base 3 iron core 4 magnet 4a stepped portion 5 of magnet outer peripheral portion Vibration plate 6 Excitation coil 7 Substrate 8a, 8b External connection terminal 9 Iron piece 10 Resonance chamber 11 Gap 12 Buffer member

Claims (5)

放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記発音体ケ−スの内周部にケース突き出し部を設け、前記マグネットは前記ケース突き出し部に前記マグネットの上面を突き当てて配置されており、
前記マグネットの外周部に段部を形成して、前記マグネットの外周部と前記発音体ケ−スの内周部との間に隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とする電磁型発音体。A sounding case having a sound emission hole, a yoke base made of a magnetic material, an iron core provided at the center of the yoke base, and an outer periphery of the yoke base A vibrating plate disposed on the magnet so as to form a magnetic circuit inside the sounding case, the magnet, the iron core, and the yoke base being inside the sounding case; and the iron core. In an electromagnetic sounding body having an exciting coil disposed around the outside and an external connection terminal for guiding a terminal of the exciting coil to the outside , a case projecting portion is provided on an inner peripheral portion of the sounding case, The magnet is arranged by abutting the upper surface of the magnet against the case protrusion,
A step is formed on the outer periphery of the magnet to provide a gap between the outer periphery of the magnet and the inner periphery of the sounding case so that the diaphragm is not plastically deformed by an external impact. An electromagnetic sounding body characterized by the following. 放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記マグネットの外周部に段部を形成し、且つ前記マグネットの段部は前記マグネットの外周部に沿って部分的に複数箇所に設けて、前記マグネットの外周部と前記発音体ケ−スの内周部との間に隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とする電磁型発音体。 A sounding case having a sound emission hole, a yoke base made of a magnetic material, an iron core provided at the center of the yoke base, and an outer periphery of the yoke base A vibrating plate disposed on the magnet so as to form a magnetic circuit inside the sounding case, the magnet, the iron core, and the yoke base being inside the sounding case; and the iron core. An electromagnetic type sounding body having an exciting coil disposed around the periphery of the magnet and an external connection terminal for guiding a terminal of the exciting coil to the outside, wherein a step is formed on an outer peripheral portion of the magnet , and a step of the magnet is formed. The portion is provided at a plurality of portions along the outer peripheral portion of the magnet, and a gap is provided between the outer peripheral portion of the magnet and the inner peripheral portion of the sounding body case. that it has not to plastically deform Electromagnetic sounding body and butterflies. 放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記発音体ケ−スの内周部にケース突き出し部を設け、前記マグネットは前記ケース突き出し部に前記マグネットの上面を突き当てて配置されており、
前記発音体ケ−スの内周部に段部を形成して、前記マグネットの外周部と前記発音体ケ−スの内周部との間に隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とする電磁型発音体。 A sounding case having a sound emission hole, a yoke base made of a magnetic material, an iron core provided at the center of the yoke base, and an outer periphery of the yoke base A vibrating plate disposed on the magnet so as to form a magnetic circuit inside the sounding case, the magnet, the iron core, and the yoke base being inside the sounding case; and the iron core. In an electromagnetic sounding body having an exciting coil disposed around the outside and an external connection terminal for guiding a terminal of the exciting coil to the outside, a case projecting portion is provided on an inner peripheral portion of the sounding case, The magnet is arranged by abutting the upper surface of the magnet against the case protrusion,
A step is formed on the inner peripheral portion of the sounding case to provide a gap between the outer peripheral portion of the magnet and the inner peripheral portion of the sounding case. An electromagnetic sounding body characterized in that it is not deformed . 放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記発音体ケ−スの内周部に段部を形成し、且つ前記発音体ケ−スの内周部の段部は前記発音体ケ−スの内周部に沿って部分的に複数箇所に設けて、前記マグネットの外周部と前記発音体ケ−スの内周部との間に隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とする電磁型発音体。 A sounding case having a sound emission hole, a yoke base made of a magnetic material, an iron core provided at the center of the yoke base, and an outer periphery of the yoke base A vibrating plate disposed on the magnet so as to form a magnetic circuit inside the sounding case, the magnet, the iron core, and the yoke base being inside the sounding case; and the iron core. An electromagnetic coil having an exciting coil disposed around the outer periphery and an external connection terminal for guiding a terminal of the exciting coil to the outside, wherein a step is formed on an inner peripheral portion of the sounding body case; In addition, the steps of the inner peripheral portion of the sounding case are provided at a plurality of positions along the inner peripheral portion of the sounding case , so that the outer peripheral portion of the magnet and the sounding case are separated from each other. A gap is provided between the diaphragm and the inner peripheral portion to prevent the diaphragm from being plastically deformed by an external impact. Electromagnetic sounding body, wherein the thing. 放音孔を有する発音体ケ−スと、磁性材料からなるヨ−クベ−スと、前記ヨ−クベ−スの中央部に設けられた鉄心と、前記ヨ−クベ−スの外周上に配置されたマグネットと、前記発音体ケ−スの内部にあって前記マグネットと前記鉄心と前記ヨ−クベ−スにより磁気回路を形成するように、前記マグネット上に配置された振動板と、前記鉄心の周囲に配置された励磁コイルと、前記励磁コイルの端末を外部に導くための外部接続端子とを有する電磁型発音体において、前記発音体ケ−スの内周部にケース突き出し部を設け、前記マグネットは前記ケース突き出し部に前記マグネットの上面を突き当てて配置されており、
前記マグネットの外周部と前記発音体ケ−スの内周部との間に緩衝部材を全周又は部分的に複数箇所に介在させて隙間を設け、外部衝撃によって前記振動板が塑性変形しないようにしたことを特徴とする電磁型発音体。
【０００１】A sounding case having a sound emission hole, a yoke base made of a magnetic material, an iron core provided at the center of the yoke base, and an outer periphery of the yoke base A vibrating plate disposed on the magnet so as to form a magnetic circuit inside the sounding case, the magnet, the iron core, and the yoke base being inside the sounding case; and the iron core. In an electromagnetic sounding body having an exciting coil disposed around the outside and an external connection terminal for guiding a terminal of the exciting coil to the outside , a case projecting portion is provided on an inner peripheral portion of the sounding case, The magnet is arranged by abutting the upper surface of the magnet against the case protrusion,
A gap is provided between the outer peripheral portion of the magnet and the inner peripheral portion of the sounding body case at a plurality of locations around the buffer member so as to prevent the diaphragm from being plastically deformed by an external impact. An electromagnetic sounding body characterized in that:
[0001]
JP29462896A 1996-10-17 1996-10-17 Electromagnetic sounding body Expired - Fee Related JP3578245B2 (en)

Priority Applications (1)

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