JPS5859699A - Electromagnetic electroacoustic transducer - Google Patents
Electromagnetic electroacoustic transducerInfo
- Publication number
- JPS5859699A JPS5859699A JP15774081A JP15774081A JPS5859699A JP S5859699 A JPS5859699 A JP S5859699A JP 15774081 A JP15774081 A JP 15774081A JP 15774081 A JP15774081 A JP 15774081A JP S5859699 A JPS5859699 A JP S5859699A
- Authority
- JP
- Japan
- Prior art keywords
- yoke
- diaphragm
- permanent magnet
- shaped
- electromagnetic
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R11/00—Transducers of moving-armature or moving-core type
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は電磁型電気−音ＩＩＭ変換器に関し、小口径化
および高能率化を目的とするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic electro-acoustic IIM converter, and aims at reducing the diameter and increasing efficiency.
電子腕時計等の小形電子機器のアラーム音発生剤めして
電磁型電気−音＊ｉ換器が用いられることか多いか、ス
ペース的な制約から、その口径は極力小さいことが硝ま
しいのは云うまでもない、ところが、従来の電磁型電気
−青畳変換器の構造では、その口径を小さくすると、１
）共振周波数が高くなること、２）変換効率が低下する
ことなどの弊害が出てくる。Electromagnetic type electricity-to-sound*i converters are often used as alarm sound generators for small electronic devices such as electronic watches, and due to space constraints, it is unfortunate that their diameter is as small as possible. Of course, in the structure of the conventional electromagnetic electric-to-blue tatami converter, if the diameter is made smaller, 1
) The resonant frequency increases, and 2) the conversion efficiency decreases.
通常、電磁ルミ気−音ＩＩＩ換器は、第１図に示す構造
によって構成される。振動板は弾性体よりなる支持板（
１）と可動継鉄（２）を固着して構成されると共に、継
鉄（３１に支持枠（４）を介して取付けられ、向定永、
久磁石（６）による静的吸引力と、支持板（１１のもつ
弾性復元力の中和点で保持されている。これに電気回路
に並設された固定励磁コイル（６）による動的磁界が重
畳され、すなわち前記吸引力が変化して振動板が振動、
発音するものである。Generally, an electromagnetic Lumi gas-sound III converter is constructed with the structure shown in FIG. The diaphragm is a support plate (
1) and a movable yoke (2), which is attached to the yoke (31) via a support frame (4).
It is held at the neutralization point of the static attraction force by the permanent magnet (6) and the elastic restoring force of the support plate (11).In addition to this, a dynamic magnetic field is generated by the fixed excitation coil (6) installed in parallel with the electric circuit. is superimposed, that is, the suction force changes and the diaphragm vibrates,
It is something to be pronounced.
この従来構造では、磁気的結合を高くとる為には、可動
継鉄（２）の径をある程度大きくする仁とが必要であり
、従って製品の口径を小さくすると、振動板の弾性部分
が狭くなり、””＄ で示される機械共振周波数
が高くなってしまう。但し、ｍは振動系の勢価質量であ
り、Ｃは振動系の尋他コンプライアンス（やわらかさを
表わす定数）である。アラームの音量を得る為には、前
記共振周波数で駆動するのが一般゛的であり、この共振
周波数が高すぎるのは聴覚上好ましくない。In this conventional structure, in order to achieve high magnetic coupling, it is necessary to increase the diameter of the movable yoke (2) to a certain extent. Therefore, if the diameter of the product is made smaller, the elastic part of the diaphragm becomes narrower. , the mechanical resonance frequency indicated by ``$'' becomes high. However, m is the force mass of the vibration system, and C is the compliance (constant representing softness) of the vibration system. In order to obtain the volume of the alarm, it is common to drive at the above-mentioned resonance frequency, and it is undesirable for auditory sense if this resonance frequency is too high.
本発明はこのような従来の問題点に鑑み、振動板の弾性
を損ねることなく小口径化せしめしかも磁気的結合を強
く保つことによって低共振周波数、高能率を実現せんと
するものである。In view of these conventional problems, the present invention aims to realize a low resonant frequency and high efficiency by reducing the diameter of the diaphragm without impairing its elasticity and maintaining strong magnetic coupling.
以下、図示の実施例について本発明を詳述する。第２関
は本発明の第１実施例を例示するものであって、これは
磁性体よりなる壷状の継鉄（１０と、との継鉄ａＯの上
端部により周辺が支持された弾性体よりなる振動板Ｑｌ
）と、前記継鉄αＯの底上面との間に僅かな空隙（ロ）
を形成すべく前記振動板αυの略中心に固着された円筒
状又は多角柱状の可動永久磁石（至）と、この可動永久
磁石（２）の周囲に適度の空隙Ｑ４を保って前記継鉄α
Ｇ内に固定されたドーナツ状の励磁コイル（ト）とから
構成されている。The invention will now be described in detail with reference to the illustrated embodiments. The second section exemplifies the first embodiment of the present invention, which is an elastic body whose periphery is supported by the upper end of the yoke aO of a pot-shaped yoke made of a magnetic material. The diaphragm Ql consists of
) and the bottom top surface of the yoke αO (b).
A cylindrical or polygonal columnar movable permanent magnet (2) is fixed approximately at the center of the diaphragm αυ to form a
It is made up of a donut-shaped excitation coil (G) fixed within G.
このように構成すれば、前述の従来構造における可動継
鉄（２）より比較的径の小さい永久磁石ａ１を支持板す
なわち振動板Ｑυに固着しているのて、振動板ａυの弾
性部分を広く保ち、かかる共振周波数の上昇を抑えるこ
とができる。また継鉄（２）の一部が振動板Ｑｌ）を支
える役目を兼ねる為、従来構造における支持枠（４！に
あたる部品を省略することができ、この面でも小口径化
に有利である。さらにコスト的に鳳でも、前記支持枠（
４１および可動継鉄（２）が不必要となり、部品コスト
、組立コスト共削減できるなど、本発明の横進による効
果は大きい。With this configuration, since the permanent magnet a1, which has a relatively smaller diameter than the movable yoke (2) in the conventional structure described above, is fixed to the support plate, that is, the diaphragm Qυ, the elastic portion of the diaphragm aυ can be widened. The increase in resonance frequency can be suppressed. In addition, since a part of the yoke (2) also serves to support the diaphragm Ql), the part corresponding to the support frame (4!) in the conventional structure can be omitted, which is also advantageous in reducing the diameter. Although it is cost-effective, the support frame (
41 and the movable yoke (2) are no longer necessary, and both parts costs and assembly costs can be reduced, and the effects of the lateral movement of the present invention are significant.
第３図は第２実施例を示し、第２図の構造にリング状の
磁性材よりなる補助継鉄ＱＱを、継鉄ａＯに外接し、か
つ永久磁石（至）の周囲に債かな空隙を形成するように
付加したものである。補助継鉄曽は磁気回路の空隙を狭
めて磁束の増大を図らんとするものであり、振動系の上
下運動を妨げない様、可動永久磁石（至）および振動板
Ｑ１とは適度な空隙ａηを保って設ける。これにより図
中の点線の如く磁気回路が形成され、磁気抵抗が減少し
て変換効率を高めることができる。Fig. 3 shows a second embodiment, in which an auxiliary yoke QQ made of a ring-shaped magnetic material is circumscribed to the yoke aO in the structure shown in Fig. 2, and a solid air gap is provided around the permanent magnet. It was added so as to form. The auxiliary yoke is intended to increase the magnetic flux by narrowing the air gap in the magnetic circuit, and in order not to impede the vertical movement of the vibration system, a suitable air gap aη is created between the movable permanent magnet (to) and the diaphragm Q1. be maintained and provided. As a result, a magnetic circuit is formed as shown by the dotted line in the figure, reducing magnetic resistance and increasing conversion efficiency.
第４図は、第３実施例を示し、第３図の構造と近似であ
るが、工法面、コスト面より補助継鉄Ｑ・を主継鉄（至
）の筒状の側面部（１８ｍ）と一体部分とし、主継鉄（
至）の下端部の水平部分に円板状の下部継鉄ＱＱを別部
品として設けたものである。Fig. 4 shows the third embodiment, which is similar to the structure shown in Fig. 3, but from the viewpoint of construction method and cost, the auxiliary yoke Q. The main yoke (
A disk-shaped lower yoke QQ is provided as a separate part on the horizontal part of the lower end of the (to).
前記第３図の構造では、継鉄００の一部に貫通穴を設け
るなどの方法により励磁コイル（２）のリード線を外部
入力端子に導く必要があるが、第４図に示す構造によれ
ば、円板状の下部継鉄０呻に切り欠き等を設けることに
より、比較的容易にリード線を外部に導くことができる
。また、支持枠を兼ねる主継鉄（財）の側面部（１８１
）と補助継鉄α・とが一体である為、可動永久磁石（至
）との空隙を保つ上で重要となる前記補助継鉄ａ・のセ
ンター穴の偏心精度を向上させる意味でも有利となる。In the structure shown in FIG. 3, it is necessary to guide the lead wire of the excitation coil (2) to the external input terminal by providing a through hole in a part of the yoke 00, but with the structure shown in FIG. For example, by providing a notch or the like in the disc-shaped lower yoke, the lead wire can be led to the outside relatively easily. In addition, the side part (181
) and the auxiliary yoke α are integrated, which is advantageous in terms of improving the eccentricity accuracy of the center hole of the auxiliary yoke a, which is important for maintaining the air gap with the movable permanent magnet (to). .
第５図は第４実施例を示し、可動永久磁石（２）の下端
に磁性体よりなる円柱状の磁心四を固着して構成したも
のである。第２図乃至第４図に示す構造では、いずれも
可動永久磁石−による静的磁束と、励磁コイル（ト）に
よる交番磁束が同じ経路を通ることになるが、永久磁石
□□□内での交流的透磁率は小さく、交流的磁気結合は
比較釣線になっている。そこで、第５図の実施例に代表
されるような構造にすれば、かかる交番磁束の通る経路
から永久磁石−を除外し、バイパスさせる仁とができる
。な詔第５図中の点線は直流磁束の経路を、また一点鎖
線は交流磁束の経路を夫々示す。すなわち、交流磁束の
経路は磁性体による継鉄と空隙のみとなり、これによっ
て交流的磁気結合が密となる。交番磁束が増大し、変換
効率が向上する。FIG. 5 shows a fourth embodiment, in which four cylindrical magnetic cores made of a magnetic material are fixed to the lower end of a movable permanent magnet (2). In the structures shown in Figures 2 to 4, the static magnetic flux from the movable permanent magnet - and the alternating magnetic flux from the excitation coil (T) pass through the same path, but the AC magnetic permeability is small, and AC magnetic coupling is a comparative fishing line. Therefore, by adopting a structure as typified by the embodiment shown in FIG. 5, the permanent magnet can be excluded from the path of the alternating magnetic flux and bypassed. The dotted line in FIG. 5 shows the path of DC magnetic flux, and the dashed line shows the path of AC magnetic flux. That is, the path of the alternating current magnetic flux consists of only the yoke made of the magnetic material and the air gap, and thereby the alternating current magnetic coupling becomes dense. The alternating magnetic flux increases and the conversion efficiency improves.
以上述べた様に本発明の４１１１造によれば、共振周波
数を上昇させることなく、効率的に、しかも安価に電磁
型電気−音響皺換器を小・口径化せしめることが可能と
なり、アラーム機能付電子ウォッチ等の働帯ＩＩａ１１
の小形、軽量化に寄与すること大である。As described above, according to the 4111 structure of the present invention, it is possible to efficiently and inexpensively reduce the size and diameter of the electromagnetic electric-acoustic wrinkle changer without increasing the resonant frequency, and it has an alarm function. Working band IIa11 with electronic watch etc.
This greatly contributes to making the product smaller and lighter.
１８１図は一般的な従来例を示す構造断面図、第２図乃
至第５図は本発明の各実施例を示す構造断面図である。
ＱＯは継鉄、（ロ）は振動板、ａ３は可動永久磁石、（
至）は励磁コイル、Ｑｔ９は補助継鉄、（至）は主継鉄
、（１８１）は側面図、Ｑｌは下部継鉄ミ（１）は磁心
である。
第４図
７４ｔ ７ρ ／γFIG. 181 is a structural sectional view showing a general conventional example, and FIGS. 2 to 5 are structural sectional views showing each embodiment of the present invention. QO is a yoke, (b) is a diaphragm, a3 is a movable permanent magnet, (
(to) is an excitation coil, Qt9 is an auxiliary yoke, (to) is a main yoke, (181) is a side view, Ql is a lower yoke, and (1) is a magnetic core. Fig. 4 74t 7ρ /γ
Claims (1)
り周辺が支持された弾性体よりなる振動板、前記継鉄の
底上面との間に僅かな空隙を形成すべく前記振動板の略
中心に固着された可動永久磁石、およびこの可動永久磁
石の周囲に過度の空隙を保って前記継鉄内番こ固定され
たドーナツ状の励磁コイルを備えたことを特徴とする電
磁型電気−音響変換器０ ■ 特許請求の範囲第１１ＪＩ記載の電磁型電気−音響
変換器において、壷状継鉄に外接し、かつ可動永久磁石
の周囲に像かな空隙を保って近接するリング状の磁性体
よりなる補助継鉄を励磁コイル上に設け、磁気抵抗を下
げて変換効率を高めたことを特徴とする電磁型電気−音
響変換器。 ■ 特許請求の範囲第２項記載の電磁型電気−前動変換
器において、補助継鉄を主継鉄の側面部と一体化し、こ
の主継鉄の下部に円板状の下部継鉄を別に設けたことを
特徴とする電磁型電気−前置変換器。 ■ 特許請求の範囲第２項および第３項記載の電磁型電
気−昔Ｗａｉｆ換器において、前記可動永久磁石の下端
に磁性体よりなる柱状の磁心を固着すると共に、この−
心と下部継鉄との間に僅かな蜜−を設け、かつ前記補助
継鉄を前記磁心の上端部に近接させたことを特徴とする
電磁型電気−前動変換器。[Claims] ■ A pot-shaped m-iron made of a magnetic material, a diaphragm made of an elastic material whose periphery is supported by the upper end of the yoke, and a slight air gap between it and the bottom top surface of the yoke. A movable permanent magnet is fixed substantially at the center of the diaphragm to form a diaphragm, and a donut-shaped excitation coil is fixed to the inside of the yoke with an excessive air gap around the movable permanent magnet. Characteristic electromagnetic electro-acoustic transducer 0 ■ The electromagnetic electro-acoustic transducer according to claim 11 JI, which is circumscribed to the pot-shaped yoke and maintains an image gap around the movable permanent magnet. An electromagnetic electro-acoustic converter characterized in that an auxiliary yoke made of adjacent ring-shaped magnetic material is provided on an excitation coil to lower magnetic resistance and increase conversion efficiency. ■ In the electromagnetic electric-forward motion converter according to claim 2, the auxiliary yoke is integrated with the side surface of the main yoke, and a disc-shaped lower yoke is separately provided below the main yoke. An electromagnetic type electrical pre-converter characterized in that: (2) In the electromagnetic type electric Waif converter according to claims 2 and 3, a columnar magnetic core made of a magnetic material is fixed to the lower end of the movable permanent magnet, and this -
1. An electromagnetic electric forward motion converter, characterized in that a slight gap is provided between the core and the lower yoke, and the auxiliary yoke is located close to the upper end of the magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15774081A JPS5859699A (en) | 1981-10-03 | 1981-10-03 | Electromagnetic electroacoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15774081A JPS5859699A (en) | 1981-10-03 | 1981-10-03 | Electromagnetic electroacoustic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5859699A true JPS5859699A (en) | 1983-04-08 |
Family
ID=15656311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15774081A Pending JPS5859699A (en) | 1981-10-03 | 1981-10-03 | Electromagnetic electroacoustic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5859699A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006033832A (en) * | 2004-07-16 | 2006-02-02 | Lg Electronics Inc | Loudspeaker apparatus using display window |
| JP2016116177A (en) * | 2014-12-17 | 2016-06-23 | 国立大学法人 名古屋工業大学 | Bone conduction device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5377491A (en) * | 1976-12-21 | 1978-07-08 | Seiko Epson Corp | Small-size electromagnetic type electroacoustic transducer |
| JPS54133895A (en) * | 1978-04-10 | 1979-10-17 | Tdk Corp | Buzzer |
-
1981
- 1981-10-03 JP JP15774081A patent/JPS5859699A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5377491A (en) * | 1976-12-21 | 1978-07-08 | Seiko Epson Corp | Small-size electromagnetic type electroacoustic transducer |
| JPS54133895A (en) * | 1978-04-10 | 1979-10-17 | Tdk Corp | Buzzer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006033832A (en) * | 2004-07-16 | 2006-02-02 | Lg Electronics Inc | Loudspeaker apparatus using display window |
| US7764803B2 (en) | 2004-07-16 | 2010-07-27 | Lg Electronics Inc. | Speaker apparatus using display window |
| JP2016116177A (en) * | 2014-12-17 | 2016-06-23 | 国立大学法人 名古屋工業大学 | Bone conduction device |
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