JPH0139038Y2 - - Google Patents
Info
- Publication number
- JPH0139038Y2 JPH0139038Y2 JP1983021112U JP2111283U JPH0139038Y2 JP H0139038 Y2 JPH0139038 Y2 JP H0139038Y2 JP 1983021112 U JP1983021112 U JP 1983021112U JP 2111283 U JP2111283 U JP 2111283U JP H0139038 Y2 JPH0139038 Y2 JP H0139038Y2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- ring
- flange
- diaphragm
- electromagnet
- 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.)
- Expired
Links
- 230000003993 interaction Effects 0.000 claims description 4
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 16
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Description
【考案の詳細な説明】
〈産業上の利用分野〉
本考案は、例えば各種の時計、カメラ、電子レ
ンジ、電卓、ポータブル、ビデオ、テープ、レコ
ーダまたはポケツトベルの報音用部品等として使
用される電磁型音響変換器に関する。[Detailed description of the invention] <Industrial field of application> The present invention is applicable to electromagnetic devices used as alarm parts for various watches, cameras, microwave ovens, calculators, portables, videos, tapes, recorders, or pocket bells, etc. The present invention relates to type acoustic transducers.
〈従来技術〉
この種の電磁型音響変換器は、筒状の外装ケー
スの内部に、電磁石と該電磁石を包囲するように
設けた筒状の永久磁石とを内蔵させ、電磁石と永
久磁石との磁気的相互作用により、電磁石の磁極
と空隙を介して対向させた振動板を振動させるよ
うになつている。第１図は電磁型音響変換器の従
来例を示す断面図であつて、合成樹脂または非磁
性金属材料等によつて筒状に形成された外装ケー
ス１の底部に、コイル２を巻装した鉄心３を有す
るヨーク４を、例えば圧入等の手段によつて取付
けると共に、該ヨーク４の上に、コイル２及び鉄
心３から成る電磁石を包囲するように、円筒状の
永久磁石５を配置し、前記外装ケース１の上部開
口部に、鉄心３の先端面３１と空隙G1を介して
対向し、かつ永久磁石５の上端面５１と空隙G2
を介して対向する円板状の振動板６を装架した構
造となつている。７は振動板６の略中央部に固着
されたバラストである。<Prior art> This type of electromagnetic acoustic transducer incorporates an electromagnet and a cylindrical permanent magnet surrounding the electromagnet inside a cylindrical exterior case, and the electromagnet and the permanent magnet are connected to each other. The magnetic interaction causes a diaphragm that faces the magnetic poles of the electromagnet with an air gap to vibrate. FIG. 1 is a sectional view showing a conventional example of an electromagnetic acoustic transducer, in which a coil 2 is wound around the bottom of an exterior case 1 formed into a cylindrical shape of synthetic resin or non-magnetic metal material. A yoke 4 having an iron core 3 is attached by a means such as press fitting, and a cylindrical permanent magnet 5 is arranged on the yoke 4 so as to surround an electromagnet consisting of a coil 2 and an iron core 3. The upper opening of the exterior case 1 is opposed to the tip surface 31 of the iron core 3 with a gap G 1 in between, and the upper end surface 51 of the permanent magnet 5 and the gap G 2 are opposed to each other.
It has a structure in which disc-shaped diaphragms 6 are mounted facing each other with a diaphragm 6 interposed therebetween. Reference numeral 7 denotes a ballast fixed approximately at the center of the diaphragm 6.
上記構造の電磁型音響変換器において、コイル
２に適当な周波数の電流を流して駆動すると、電
磁石２，３に発生する電磁力と、空隙G2におけ
る永久磁石５の一方向性磁気バイアスとの磁気的
相互作用及び振動板６のバネ性により、振動板６
が駆動電流の周波数に依存して空隙G1、及びG2
内で振動し、振動音が得られる。 In the electromagnetic acoustic transducer having the above structure, when the coil 2 is driven by passing a current of an appropriate frequency, the electromagnetic force generated in the electromagnets 2 and 3 and the unidirectional magnetic bias of the permanent magnet 5 in the air gap G 2 are combined. Due to the magnetic interaction and the springiness of the diaphragm 6, the diaphragm 6
The air gaps G 1 and G 2 depend on the frequency of the driving current.
It vibrates within itself, producing a vibration sound.
〈考案が解決しようとする課題〉
しかしながら、従来の電磁型音響変換器は、円
筒状に形成された外装ケース１の内径部内に、同
じく円筒状に形成された永久磁石５を、単純に嵌
挿しただけの構造であつて、永久磁石５の軸方向
への位置決め機構を持たないため、組立時に永久
磁石５を所定位置にセツトすることが因難にな
り、また組立後に振動板６の方向に簡単に移動し
てしまう。このため、振動板６に対して一方向性
磁気バイアスを加える空隙G2の寸法が変動し、
周波数特性、音圧及び音色が変動してしまうと言
う難点があつた。永久磁石５をヨーク４の上に接
着する等の手段を採ればこの難点は解決できる
が、この場合は組立作業が非常に面倒になり、量
産性が低下する。<Problem to be solved by the invention> However, in the conventional electromagnetic acoustic transducer, the permanent magnet 5, which is also formed in a cylindrical shape, is simply inserted into the inner diameter of the outer case 1, which is formed in a cylindrical shape. However, since it does not have a mechanism for positioning the permanent magnet 5 in the axial direction, it becomes difficult to set the permanent magnet 5 in a predetermined position during assembly. It moves easily. For this reason, the dimensions of the air gap G 2 that applies a unidirectional magnetic bias to the diaphragm 6 vary,
The problem was that the frequency characteristics, sound pressure, and timbre varied. This difficulty can be solved by adhering the permanent magnet 5 onto the yoke 4, but in this case, the assembly work becomes extremely troublesome and mass productivity decreases.
上述の問題を解決し得る従来技術としては、例
えば実開昭58−18300号公報に記載されたものが
ある。この従来技術では、外装ケースの内部の軸
方向の中間部にリング状の鍔部を設け、鍔部の下
方に広がる段部内に、リング状永久磁石の全体を
嵌合させてあつた。 As a conventional technique capable of solving the above-mentioned problem, for example, there is a technique described in Japanese Utility Model Application Publication No. 18300/1983. In this prior art, a ring-shaped flange is provided in the axially intermediate portion of the interior of the outer case, and the entire ring-shaped permanent magnet is fitted into a step extending below the flange.
しかし、リング状永久磁石の全体が鍔部の下方
に広がる段部内に収納されてしまうため、永久磁
石と振動板との間の空隙を、鍔部の厚みよりは小
さくすることができず、一方向性磁気バイアス及
び音響特性の低下を招くと共に、軸方向の長さ縮
小に限界を生じ、小型化しにくいという問題点が
あつた。 However, since the entire ring-shaped permanent magnet is housed within the step extending below the flange, the gap between the permanent magnet and the diaphragm cannot be made smaller than the thickness of the flange. In addition to causing deterioration in directional magnetic bias and acoustic characteristics, there was also a problem in that there was a limit to reducing the length in the axial direction, making it difficult to miniaturize.
そこで、本考案の課題は、上述する従来の問題
点を解決し、外装ケース内に対して永久磁石を組
込む場合に、接着材等を使用することなく、所定
位置に簡単、かつ、確実に位置決めでき、しかも
永久磁石と振動板との間の空隙距離を自由に選定
して、必要な一方向性磁気バイアス及び音響特性
を得ることができ、更に小型化を図るのに好適な
電磁型音響変換器を提供することである。 Therefore, the problem of the present invention is to solve the above-mentioned conventional problems and to easily and reliably position the permanent magnet in a predetermined position without using adhesives etc. when incorporating the permanent magnet into the exterior case. This electromagnetic acoustic transducer is suitable for further downsizing, and allows the necessary unidirectional magnetic bias and acoustic characteristics to be obtained by freely selecting the air gap distance between the permanent magnet and the diaphragm. It is to provide a vessel.
〈課題を解決するための手段〉
上述する課題解決のため、本考案は、筒状の外
装ケースの内部に、電磁石と該電磁石を包囲する
ように配置された永久磁石とを有し、前記電磁石
と前記永久磁石との磁気的相互作用により、前記
電磁石の磁極と空隙を介して対向させた振動板を
振動させるようにした電磁型音響変換器におい
て、
前記外装ケースは、その内部の軸方向の中間部
にリング状の鍔部を有しており、
前記永久磁石は、上端面にリング状段部を有し
ていて、前記リング状段部の外周リング部が前記
鍔部の下方に広がる段部に嵌合し、内周リング部
が前記鍔部によつて囲まれた内径部内に突出する
ように、前記外装ケースの内部に組込まれてお
り、
前記振動板は、前記鍔部の上面に装架されてい
ること
を特徴とする。<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention includes an electromagnet and a permanent magnet arranged to surround the electromagnet inside a cylindrical exterior case, and the electromagnet In the electromagnetic acoustic transducer, a diaphragm facing the magnetic pole of the electromagnet and an air gap is vibrated by magnetic interaction with the permanent magnet. The permanent magnet has a ring-shaped flange in an intermediate portion, and the permanent magnet has a ring-shaped stepped portion on an upper end surface, and an outer ring portion of the ring-shaped stepped portion extends below the flange. The diaphragm is fitted into the outer case so that the inner ring part projects into the inner diameter part surrounded by the collar part, and the diaphragm is fitted onto the upper surface of the collar part. It is characterized by being mounted.
〈作用〉
外装ケースは、その内部の軸方向の中間部にリ
ング状の鍔部を有しており、永久磁石は、上端面
にリング状段部を有していて、リング状段部の外
周リング部が鍔部の下方に広がる段部に嵌合して
いるので、永久磁石の外周リング部と、鍔部の下
方に広がる段部との係合により、組立時には永久
磁石が外装ケースの所定位置に位置決めされ、組
立後は永久磁石の軸方向への移動が阻止される。
このため、永久磁石の軸方向への位置ズレ及び移
動、それによる空隙の変動が確実に阻止され、周
波数特性、音圧及び音色の安定した電磁型音響変
換器が得られる。しかも、接着剤等を用いること
なく、外装ケースに対して永久磁石を位置決めで
きるから、組立が非常に簡単になり、量産性が向
上する。<Function> The exterior case has a ring-shaped flange in the axially intermediate portion of the interior thereof, and the permanent magnet has a ring-shaped step on its upper end surface, and the outer periphery of the ring-shaped step Since the ring part fits into the step part extending below the flange, the engagement between the outer ring part of the permanent magnet and the step part extending below the flange allows the permanent magnet to be held in place on the outer case during assembly. After assembly, the permanent magnet is prevented from moving in the axial direction.
Therefore, displacement and movement of the permanent magnet in the axial direction and fluctuation of the air gap due to this are reliably prevented, and an electromagnetic acoustic transducer with stable frequency characteristics, sound pressure, and timbre can be obtained. Moreover, since the permanent magnet can be positioned with respect to the outer case without using adhesive or the like, assembly becomes extremely simple and mass productivity is improved.
更に、永久磁石は、内周リング部が鍔部によつ
て囲まれた内径部内に突出するように、外装ケー
スの内部に組込まれており、振動板は、鍔部の上
面に装架されているので、振動板と永久磁石との
間の空隙距離を、鍔部の厚みによる影響を受ける
ことなく、自由に選定して、必要な一方向性磁気
バイアス及び音響特性を得ることができる。ま
た、空隙距離の縮小による小型化も容易になる。 Furthermore, the permanent magnet is built into the exterior case so that the inner circumferential ring part protrudes into the inner diameter part surrounded by the flange part, and the diaphragm is mounted on the top surface of the flange part. Therefore, the air gap distance between the diaphragm and the permanent magnet can be freely selected without being affected by the thickness of the flange, and the necessary unidirectional magnetic bias and acoustic characteristics can be obtained. Furthermore, miniaturization by reducing the gap distance becomes easy.
〈実施例〉
第２図は本考案に係る電磁型音響変換器の正面
部分断面図である。図において、第１図と同一の
参照符号は同一性ある構成部分を示している。こ
の実施例では、合成樹脂または非磁性金属材料等
を用いて円筒状に形成した外装ケース１は、その
内部の軸方向の中間部にリング状の鍔部１０３を
有している。<Example> FIG. 2 is a front partial sectional view of an electromagnetic acoustic transducer according to the present invention. In the figure, the same reference numerals as in FIG. 1 indicate the same components. In this embodiment, an exterior case 1 formed into a cylindrical shape using a synthetic resin, a non-magnetic metal material, or the like has a ring-shaped flange 103 at an axially intermediate portion inside thereof.
永久磁石５は、上端面にリング状段部５１を有
していて、リング状段部５１の外周リング部５１
１が鍔部１０３の下方に広がる段部１０１に嵌合
し、内周リング部５１２が鍔部１０３によつて囲
まれた内径部１０４内の突出するように、外装ケ
ース１の内部に組込まれている。 The permanent magnet 5 has a ring-shaped stepped portion 51 on its upper end surface, and an outer ring portion 51 of the ring-shaped stepped portion 51
1 is fitted into the step part 101 extending below the flange part 103, and the inner peripheral ring part 512 is assembled inside the outer case 1 so as to protrude within the inner diameter part 104 surrounded by the flange part 103. ing.
振動板６は、鍔部１０３の上面に装架されてい
る。 The diaphragm 6 is mounted on the upper surface of the collar portion 103.
上述のような構造であると、鍔部１０３の下方
に広がる段部１０１と、永久磁石５の外周リング
部５１１との係合により、組立時には永久磁石５
が外装ケース１の所定位置に位置決めされ、組立
後は永久磁石５の軸方向への移動が阻止されるか
ら、永久磁石５の軸方向への位置ズレ及び移動、
それによる空隙G2の変動が確実に阻止され、周
波数特性、音圧及び音色の安定した電磁型音響変
換器が得られる。しかも、接着剤等を用いること
なく、外装ケース１に対して永久磁石５を一体に
結合できるから、組立が非常に簡単になり、量産
性が向上する。 With the above-described structure, the engagement between the step portion 101 extending below the flange portion 103 and the outer circumferential ring portion 511 of the permanent magnet 5 causes the permanent magnet 5 to
is positioned at a predetermined position in the exterior case 1, and movement of the permanent magnet 5 in the axial direction is prevented after assembly.
Fluctuations in the air gap G2 due to this are reliably prevented, and an electromagnetic acoustic transducer with stable frequency characteristics, sound pressure, and timbre can be obtained. Furthermore, since the permanent magnet 5 can be integrally bonded to the outer case 1 without using an adhesive or the like, assembly becomes extremely simple and mass productivity is improved.
しかも、永久磁石５は、内周リング部５１２が
鍔部１０３によつて囲まれた内径部１０４内に突
出するように、外装ケース１の内部に組込まれて
おり、振動板６は、鍔部１０３の上面に装架され
ているので、振動板６と永久磁石５との間の空隙
G2を、鍔部１０３の厚みによる影響を受けるこ
となく、自由に選定して、必要な一方向性磁気バ
イアス及び音響特性を得ることができる。また、
鍔部１０３によつて囲まれた内径部１０４内で、
永久磁石５の内周リング部５１２の端面を振動板
６の方向に近づけ、空隙G2の距離を縮小して小
型化することも容易である。 Moreover, the permanent magnet 5 is built into the exterior case 1 so that the inner circumference ring part 512 protrudes into the inner diameter part 104 surrounded by the flange part 103, and the diaphragm 6 is attached to the flange part. Since it is mounted on the upper surface of 103, the air gap between the diaphragm 6 and the permanent magnet 5
G 2 can be freely selected without being affected by the thickness of the flange 103 to obtain the necessary unidirectional magnetic bias and acoustic characteristics. Also,
Within the inner diameter portion 104 surrounded by the collar portion 103,
It is also easy to reduce the size by bringing the end face of the inner ring portion 512 of the permanent magnet 5 closer to the direction of the diaphragm 6 and reducing the distance of the air gap G2 .
更に、第２図の実施例では、音圧レベルを向上
させると同時に、音響変換部を保護するため、振
動板６を装架した外装ケース１の一端部側に放音
筒体８を装着した構造となつている。外装ケース
１と放音筒体８の結合に当つては、外装ケース１
の一端部外周と、放音筒体８の一端部内周とに、
互いに嵌合し得る略Ｓ字状の凹凸部１０２及び８
１をそれぞれ形成し、これらの凹凸部１０２及び
８１を、その弾力を利用して凹凸嵌合させること
により、外装ケース１の一端部に放音筒体８を結
合させた構造となつている。 Furthermore, in the embodiment shown in FIG. 2, in order to improve the sound pressure level and at the same time protect the acoustic transducer, a sound emitting cylinder 8 is attached to one end of the outer case 1 on which the diaphragm 6 is mounted. It has a structure. When connecting the outer case 1 and the sound emitting cylinder 8, the outer case 1
On the outer periphery of one end and the inner periphery of one end of the sound emitting cylinder 8,
Approximately S-shaped uneven parts 102 and 8 that can fit into each other
1 are respectively formed, and the sound emitting cylinder 8 is coupled to one end of the exterior case 1 by fitting the concave and convex portions 102 and 81 using their elasticity.
このような構造であると、接着剤等を用いるこ
となく、外装ケース１に対して放音筒体８を一体
に結合できるから、上記永久磁石５の組立の簡単
化と併せて、全体の組立が非常に簡単になる。し
かも上記凹凸嵌合により、外装ケース１と放音筒
体８の接合面積が従来より著しく増大するから、
両者１−８の結合強度が非常に大きくなると同時
に密着性も増大し、放音筒体の位置ズレもしくは
脱落等または接合面からの漏水等を生じることの
ない高信頼度の電磁型音響変換器が得られる。 With such a structure, the sound emitting cylinder 8 can be integrally connected to the outer case 1 without using adhesives, etc., which not only simplifies the assembly of the permanent magnet 5 but also reduces the overall assembly. becomes very easy. Moreover, due to the above-mentioned uneven fitting, the joint area between the outer case 1 and the sound emitting cylinder 8 is significantly increased compared to the conventional case.
A highly reliable electromagnetic acoustic transducer in which the bonding strength of both 1-8 is extremely large and the adhesion is also increased, and the sound emitting cylinder does not shift or fall off, or water leaks from the joint surface. is obtained.
〈考案の効果〉
以上述べたように、本考案によれば、次によう
な効果が得られる。<Effects of the invention> As described above, according to the present invention, the following effects can be obtained.
(a) 外装ケースは、その内部の軸方向の中間部に
リング状の鍔部を有しており、永久磁石は、上
端面のリング状段部を有していて、リング状段
部の外周リング部が鍔部の下方に広がる段部に
嵌合しているので、永久磁石の軸方向への位置
ズレ及び移動、それによる空隙の変動が確実に
阻止され、周波数特性、音圧及び音色の安定し
た電磁型音響変換器を提供できる。(a) The outer case has a ring-shaped flange in the axially intermediate part of the interior thereof, and the permanent magnet has a ring-shaped stepped part on the upper end surface, and the outer periphery of the ring-shaped stepped part. Since the ring part fits into the step part extending below the flange part, displacement and movement of the permanent magnet in the axial direction and fluctuation of the air gap due to this are reliably prevented, and the frequency characteristics, sound pressure, and timbre are improved. A stable electromagnetic acoustic transducer can be provided.
(b) 接着剤等を用いることなく、外装ケースに対
して永久磁石を位置決めできるから、組立が非
常に簡単で、量産性に富む電磁型音響変換器を
提供できる。(b) Since the permanent magnet can be positioned with respect to the outer case without using adhesives, it is possible to provide an electromagnetic acoustic transducer that is extremely easy to assemble and is highly suitable for mass production.
(c) 永久磁石は、内周リング部が鍔部によつて囲
まれた内径部内に突出するように、外装ケース
の内部に組込まれており、振動板は、鍔部の上
面に装架されているので、振動板と永久磁石と
の間に空隙距離を、鍔部の厚みによる影響を受
けることなく、自由に選定し、必要な一方向性
磁気バイアス及び音響特性を有する電磁型音響
変換器を提供できる。(c) The permanent magnet is built into the outer case so that the inner ring protrudes into the inner diameter surrounded by the flange, and the diaphragm is mounted on the top surface of the flange. Therefore, the air gap distance between the diaphragm and the permanent magnet can be freely selected without being affected by the thickness of the flange, and the electromagnetic acoustic transducer has the necessary unidirectional magnetic bias and acoustic characteristics. can be provided.
(d) 振動板と永久磁石との間の空隙距離を縮小し
て、容易に小型化し得る音響変換器を提供でき
る。(d) It is possible to provide an acoustic transducer that can be easily miniaturized by reducing the air gap distance between the diaphragm and the permanent magnet.
第１図は従来の電磁型音響変換器の正面部分断
面図、第２図は本考案に係る電磁型音響変換器の
正面部分断面図である。
１……外装ケース、２……コイル、３……鉄
心、４……ヨーク、５……永久磁石、６……振動
板、１０１……段部、１０３……鍔部、１０４…
…内径部、５１……段部、５１１……外周リング
部、５１２……内周リング部。
FIG. 1 is a front partial sectional view of a conventional electromagnetic acoustic transducer, and FIG. 2 is a front partial sectional view of an electromagnetic acoustic transducer according to the present invention. DESCRIPTION OF SYMBOLS 1... Exterior case, 2... Coil, 3... Iron core, 4... Yoke, 5... Permanent magnet, 6... Vibration plate, 101... Step part, 103... Flange part, 104...
...Inner diameter part, 51...Step part, 511...Outer ring part, 512...Inner ring part.
Claims (1)
石を包囲するように配置された永久磁石とを有
し、前記電磁石と前記永久磁石との磁気的相互
作用により、前記電磁石の磁極と空隙を介して
対向させた振動板を振動させるようにした電磁
型音響変換器において、 前記外装ケースは、その内部の軸方向の中間
部にリング状の鍔部を有しており、 前記永久磁石は、上端面にリング状段部を有
していて、前記リング状段部の外周リング部が
前記鍔部の下方に広がる段部に嵌合し、内周リ
ング部が前記鍔部によつて囲まれた内径部内に
突出するように、前記外装ケースの内部に組込
まれており、 前記振動板は、前記鍔部の上面に装架されて
いること を特徴とする電磁型音響変換器。 (2) 前記外装ケースの一端側に放音筒体を装着し
て構成され、前記外装ケース及び前記放音筒体
は、互いの弾力性を利用し、凹凸嵌合によつて
結合したことを特徴とする実用新案登録請求の
範囲第１項に記載の電磁型音響変換器。[Claims for Utility Model Registration] (1) An electromagnet and a permanent magnet arranged to surround the electromagnet are provided inside a cylindrical exterior case, and the magnetic interaction between the electromagnet and the permanent magnet is In an electromagnetic acoustic transducer that vibrates a diaphragm facing the magnetic pole of the electromagnet through an air gap, the outer case has a ring-shaped flange in an axially intermediate portion thereof. The permanent magnet has a ring-shaped stepped portion on an upper end surface, an outer circumferential ring portion of the ring-shaped stepped portion fits into a downwardly extending step portion of the flange portion, and an inner circumferential ring The diaphragm is incorporated into the outer case so as to protrude into an inner diameter portion surrounded by the flange, and the diaphragm is mounted on the upper surface of the flange. An electromagnetic acoustic transducer. (2) A sound emitting cylinder is attached to one end of the outer case, and the outer case and the sound emitting cylinder are connected by uneven fitting using each other's elasticity. An electromagnetic acoustic transducer according to claim 1, characterized in that it is a utility model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2111283U JPS59127395U (en) | 1983-02-16 | 1983-02-16 | Electromagnetic acoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2111283U JPS59127395U (en) | 1983-02-16 | 1983-02-16 | Electromagnetic acoustic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59127395U JPS59127395U (en) | 1984-08-27 |
| JPH0139038Y2 true JPH0139038Y2 (en) | 1989-11-21 |
Family
ID=30152242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2111283U Granted JPS59127395U (en) | 1983-02-16 | 1983-02-16 | Electromagnetic acoustic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59127395U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5818300B2 (en) * | 1979-12-03 | 1983-04-12 | 金山機械株式会社 | Automatic sagger filling machine for tile base |
| JPS58126598A (en) * | 1982-01-22 | 1983-07-28 | 株式会社精工舎 | Electromagnetic buzzer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57115798U (en) * | 1981-01-10 | 1982-07-17 | ||
| JPS5818300U (en) * | 1981-07-30 | 1983-02-04 | セイコ−京葉工業株式会社 | small sounding body |
| JPS5886699U (en) * | 1981-12-04 | 1983-06-11 | 株式会社 シチズン電子 | Electromagnetic sounding body |
-
1983
- 1983-02-16 JP JP2111283U patent/JPS59127395U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5818300B2 (en) * | 1979-12-03 | 1983-04-12 | 金山機械株式会社 | Automatic sagger filling machine for tile base |
| JPS58126598A (en) * | 1982-01-22 | 1983-07-28 | 株式会社精工舎 | Electromagnetic buzzer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59127395U (en) | 1984-08-27 |
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