JPH0238558Y2 - - Google Patents
Info
- Publication number
- JPH0238558Y2 JPH0238558Y2 JP15751784U JP15751784U JPH0238558Y2 JP H0238558 Y2 JPH0238558 Y2 JP H0238558Y2 JP 15751784 U JP15751784 U JP 15751784U JP 15751784 U JP15751784 U JP 15751784U JP H0238558 Y2 JPH0238558 Y2 JP H0238558Y2
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- support
- adhesive
- outer periphery
- inner diameter
- 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
- 239000000853 adhesive Substances 0.000 claims description 14
- 230000001070 adhesive effect Effects 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は目覚時計のアラ−ム装置や、タイマの
報時装置などに用いる発音装置に関する。[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a sounding device used in an alarm device of an alarm clock, a time signal device of a timer, etc.
（従来の技術）
従来のこの種の発音装置として第５図示のもの
があつた。この発音装置は振動板１０に圧電素子
１１を貼着してあり、振動板１０は外周をホ−ン
１２に支持されている。この振動板１０の共振周
波数は支持半径をａとしたとき、ａの２乗に反比
例する。振動板１０は金属板材をプレスにて形成
するものであり、抜き裏にはバリが生じることが
ある。バリが外周端に生じると、バリにより支持
半径はａより大きいＡとなり共振周波数が低下す
る。(Prior Art) As a conventional sounding device of this type, there is one shown in FIG. This sound generating device has a piezoelectric element 11 attached to a diaphragm 10, and the diaphragm 10 is supported by a horn 12 at its outer periphery. The resonant frequency of this diaphragm 10 is inversely proportional to the square of a, where a is the support radius. The diaphragm 10 is formed by pressing a metal plate material, and burrs may occur on the back side of the punched part. When a burr is formed on the outer peripheral end, the support radius becomes A, which is larger than a, and the resonance frequency decreases.
（考案が解決しようとする問題点）
このように振動板１０の共振周波数が低下する
と、駆動回路の発振周波数との関係で音圧のレベ
ルが低下してしまうという問題点が生じる。また
支持半径ａを外径に近づけると、振動板の接着強
度の点で問題が生じる。(Problems to be Solved by the Invention) When the resonant frequency of the diaphragm 10 decreases as described above, a problem arises in that the sound pressure level decreases in relation to the oscillation frequency of the drive circuit. Furthermore, if the support radius a approaches the outer diameter, a problem arises in terms of adhesive strength of the diaphragm.
本考案は振動板のバリの有無にかかわらず音圧
レベルをほぼ一定にでき、接着強度の点で問題の
ない発音装置を堤供するものである。 The present invention provides a sounding device in which the sound pressure level can be kept almost constant regardless of the presence or absence of burrs on the diaphragm, and there is no problem in terms of adhesive strength.
（問題点を解決するための手段）
振動板の外周部を支持する支持する支持体に
は、振動板の外周よりわずかに内周側に段差面を
設け、振動板は外周部を軟質接着剤により支持さ
れ、軟質接着剤が振動板と段差面との間〓に介在
している。(Means for solving the problem) The supporting body that supports the outer periphery of the diaphragm is provided with a stepped surface slightly on the inner periphery side than the outer periphery of the diaphragm. A soft adhesive is interposed between the diaphragm and the stepped surface.
（作用）
支持体の外周部に振動板の外周よりわずかに内
周側に段差面を設けてあり、振動板は外周部を軟
質接着剤にて支持されているため、支持半径と振
動板の外径とがわずかしか変わらない。このため
バリの有無により共振周波数が大きく変動するこ
とがなく、音圧レベルも大きく変動することはな
い。また接着剤が段差面と振動板との間に介在す
るため、接着面積が大きく強度も大きい。(Function) A stepped surface is provided on the outer periphery of the support body slightly inward from the outer periphery of the diaphragm, and since the diaphragm is supported on the outer periphery with a soft adhesive, the support radius and the diaphragm There is only a slight difference in the outer diameter. Therefore, the resonance frequency does not vary greatly depending on the presence or absence of burrs, and the sound pressure level also does not vary greatly. Furthermore, since the adhesive is interposed between the stepped surface and the diaphragm, the adhesive area is large and the strength is high.
（実施例）
図面において、振動板１は0.2mm程度の厚さの
黄銅などの金属薄板より形成され、直径20mm程度
の円形形状をしている。振動板１にはこの振動板
の振動手段としてチタン酸バリウムなどの圧電素
子２が貼着してある。圧電素子２も円形形状であ
り、振動板１の中央に位置している。圧電素子２
の表面には電極３が真空蒸着、スパツタリングな
どの手法により形成してある。そして圧電素子２
に電界を印加するリード線４ａ，４ｂが、それぞ
れ振動板１、電極３にハンダ付してある。振動板
１の外周部を支持するホーン５はプラスチツクよ
り形成され、円筒部５ａおよび放音孔５ｂを形成
した底板部５ｃより構成されている。ホーン５の
開口側の円筒部５ａには振動板１の支持面５ｄが
落込んで形成してあり、支持面５ｄの内径は振動
板１の外径d1よりわずかに大きく設定してある。
ホーン５の支持面５ｄの内周側には、振動板１の
外径d1よりわずかに小さい内径d2の段差面５ｅが
形成してある。振動板１は外周部をシリコン系の
軟質で、ある程度弾力をもつた接着剤６にてホ−
ン５の支持面５ｄに接着されている。そして接着
剤６は振動板１の外周端部および振動板１と段差
面５ｅとの間〓に介在し、円筒部５ａの内径d3と
段差面５ｅの内径d2の間〓、振動板１の外径d1と
内径d2との間および振動板１の外周端面が接着さ
れ、振動板１は広い接着面積でホーン５に接着さ
れている。ホーン５の外周には取付部５ｆ，５ｆ
が突設してある。(Example) In the drawings, a diaphragm 1 is formed from a thin metal plate such as brass with a thickness of about 0.2 mm, and has a circular shape with a diameter of about 20 mm. A piezoelectric element 2 made of barium titanate or the like is attached to the diaphragm 1 as a vibration means for the diaphragm. The piezoelectric element 2 also has a circular shape and is located at the center of the diaphragm 1. Piezoelectric element 2
An electrode 3 is formed on the surface by vacuum deposition, sputtering, or the like. and piezoelectric element 2
Lead wires 4a and 4b for applying an electric field are soldered to the diaphragm 1 and the electrode 3, respectively. The horn 5 supporting the outer circumferential portion of the diaphragm 1 is made of plastic and includes a cylindrical portion 5a and a bottom plate portion 5c in which a sound emitting hole 5b is formed. A support surface 5d of the diaphragm 1 is formed to be depressed into the cylindrical portion 5a on the opening side of the horn 5, and the inner diameter of the support surface 5d is set to be slightly larger than the outer diameter d1 of the diaphragm 1.
A step surface 5e having an inner diameter d2 slightly smaller than the outer diameter d1 of the diaphragm 1 is formed on the inner peripheral side of the support surface 5d of the horn 5. The outer periphery of the diaphragm 1 is glued with a silicone-based soft adhesive 6 that has some elasticity.
is adhered to the support surface 5d of the ring 5. The adhesive 6 is interposed between the outer peripheral end of the diaphragm 1 and between the diaphragm 1 and the step surface 5e, and between the inner diameter d 3 of the cylindrical portion 5a and the inner diameter d 2 of the step surface 5e, the diaphragm 1 The diaphragm 1 is bonded between the outer diameter d 1 and the inner diameter d 2 and the outer peripheral end surface of the diaphragm 1, and the diaphragm 1 is bonded to the horn 5 over a wide bonding area. Attachment parts 5f, 5f are provided on the outer circumference of the horn 5.
is installed protrudingly.
ホーン５に振動板１を接着すには、支持面５ｄ
および段差面５ｅに接着剤６を塗布し、支持面５
ｄ上に振動板１を載置し、押圧して接着する。こ
れにより振動板１は外径d1より円筒部５ａの内径
d3までの広い面積で接着され、接着強度も大き
く、脱落することはない。 To attach the diaphragm 1 to the horn 5, attach the supporting surface 5d.
Apply adhesive 6 to the step surface 5e, and apply the adhesive 6 to the support surface 5e.
Place the diaphragm 1 on top d and press it to adhere. As a result, the diaphragm 1 has an inner diameter of the cylindrical portion 5a than an outer diameter d 1 .
It adheres over a wide area up to d3 , has high adhesive strength, and will not fall off.
リード線４ａ，４ｂに所定の周波数の矩形波な
どを入力すると、圧電素子２はピエゾ効果により
振動し、振動板１も振動する。この種の振動板の
共振周波数は一般につぎの式で求められる。 When a rectangular wave of a predetermined frequency is input to the lead wires 4a and 4b, the piezoelectric element 2 vibrates due to the piezo effect, and the diaphragm 1 also vibrates. The resonant frequency of this type of diaphragm is generally determined by the following formula.
同式においてｋは定数、ｔは振動板の板厚
（ｍ）、ａは振動板の半径（ｍ）、Ｅはヤング率
（Ｎ／m3）、ρは密度（Kg／m3）、σはポアツソン
比である。そして振動板１は接着剤６が軟質であ
るため、段差面５ｅの内径d2に対応する共振周波
数2で共振する。しかし振動板１にプレス成形時
のバリが突出し、このバリが支持面５ｄに接して
いる場合、振動板１は外径d1に対応する共振周波
数1で共振する。しかしながら振動板１の外径d1
に対し段差面５ｅの内径d2はわずかに内周側であ
り、本実施例では外径d1と内径d2との差は直径で
0.4〜0.6mm程度であるため、バリの有無にかかわ
らず共振周波数1と2との差はわずかとなる。こ
のためリード線４ａ，４ｂに入力される。駆動電
流の発振周波数との関係で音圧レベルが大幅に変
化することはない。 In the same equation, k is a constant, t is the thickness of the diaphragm (m), a is the radius of the diaphragm (m), E is Young's modulus (N/m 3 ), ρ is the density (Kg/m 3 ), and σ is Poisson's ratio. Since the adhesive 6 is soft, the diaphragm 1 resonates at a resonance frequency 2 corresponding to the inner diameter d 2 of the stepped surface 5e. However, if a burr protrudes from the diaphragm 1 during press molding and is in contact with the support surface 5d, the diaphragm 1 resonates at a resonance frequency 1 corresponding to the outer diameter d1. However, the outer diameter d 1 of the diaphragm 1
On the other hand, the inner diameter d 2 of the stepped surface 5e is slightly on the inner circumferential side, and in this embodiment, the difference between the outer diameter d 1 and the inner diameter d 2 is the diameter.
Since it is approximately 0.4 to 0.6 mm, the difference between resonance frequencies 1 and 2 is small regardless of the presence or absence of burrs. Therefore, it is input to the lead wires 4a and 4b. The sound pressure level does not change significantly in relation to the oscillation frequency of the drive current.
なお本実施例では振動板の振動手段として圧電
素子を用いたが、振動板に永久磁石や磁性材を固
着し、これらにコイルを対向させて振動板を振動
させるなど適宜の手段を用いることができる。 In this example, a piezoelectric element was used as the vibrating means for the diaphragm, but it is also possible to use any other appropriate means such as fixing a permanent magnet or magnetic material to the diaphragm and placing a coil facing them to vibrate the diaphragm. can.
（考案の効果）
本考案によれば、振動板のバリなどの製造上の
微差により発音装置の音圧レベルが大きく変動す
ることがない。また振動板は支持体に確実に支持
され、脱落することはない。(Effects of the invention) According to the invention, the sound pressure level of the sounding device does not vary greatly due to minute differences in manufacturing such as burrs on the diaphragm. Furthermore, the diaphragm is reliably supported by the support and will not fall off.
第１図は第２図−線における要部拡大断面
図、第２図は本考案の一実施例の正面図、第３図
は第２図−線におけるリ−ド線を省略した断
面図、第４図は背面図、第５図は従来の技術を示
す要部断面図である。
１……振動板、２……圧電素子、３……電極、
５……ホーン、５ｄ……支持面、５ｅ……段差
面、d2……段差面の内径。
FIG. 1 is an enlarged cross-sectional view of the main part along the line in FIG. 2, FIG. 2 is a front view of an embodiment of the present invention, and FIG. 3 is a cross-sectional view along the line in FIG. 2 with the lead wire omitted. FIG. 4 is a rear view, and FIG. 5 is a sectional view of a main part showing a conventional technique. 1... Vibration plate, 2... Piezoelectric element, 3... Electrode,
5...Horn, 5d...Supporting surface, 5e...Step surface, d2 ...Inner diameter of step surface.
Claims (1)
体とを設けてあり、 上記支持体は上記振動板の外周よりわずかに内
周側に段差面を設けてあり、 上記振動板は上記支持体に外周部を軟質接着剤
にて支持されており、 上記軟質接着剤は上記振動板と上記段差面との
間〓に介在していることを特徴とする発音装置。[Claims for Utility Model Registration] A diaphragm and a support that supports the outer periphery of the diaphragm are provided, and the support has a stepped surface slightly inner than the outer periphery of the diaphragm. The diaphragm is supported by a soft adhesive at its outer peripheral portion on the support body, and the soft adhesive is interposed between the diaphragm and the stepped surface. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15751784U JPH0238558Y2 (en) | 1984-10-18 | 1984-10-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15751784U JPH0238558Y2 (en) | 1984-10-18 | 1984-10-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6172998U JPS6172998U (en) | 1986-05-17 |
| JPH0238558Y2 true JPH0238558Y2 (en) | 1990-10-17 |
Family
ID=30715509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15751784U Expired JPH0238558Y2 (en) | 1984-10-18 | 1984-10-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0238558Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006352415A (en) * | 2005-06-15 | 2006-12-28 | Star Micronics Co Ltd | Electroacoustic transducer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5540921B2 (en) * | 2010-06-17 | 2014-07-02 | ソニー株式会社 | Acoustic transducer |
-
1984
- 1984-10-18 JP JP15751784U patent/JPH0238558Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006352415A (en) * | 2005-06-15 | 2006-12-28 | Star Micronics Co Ltd | Electroacoustic transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6172998U (en) | 1986-05-17 |
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