JPS636956Y2 - - Google Patents
Info
- Publication number
- JPS636956Y2 JPS636956Y2 JP1982141649U JP14164982U JPS636956Y2 JP S636956 Y2 JPS636956 Y2 JP S636956Y2 JP 1982141649 U JP1982141649 U JP 1982141649U JP 14164982 U JP14164982 U JP 14164982U JP S636956 Y2 JPS636956 Y2 JP S636956Y2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- fixed
- diaphragm
- resonance
- speaker
- 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
- 238000013016 damping Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical group [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Description
【考案の詳細な説明】
この考案は圧電素子を駆動部に用いたスピーカ
ーの改良に関する。[Detailed Description of the Invention] This invention relates to an improvement of a speaker using a piezoelectric element as a driving part.
圧電素子を駆動部としたこの種のスピーカーは
第１図に示すように、圧電素子１（例えば一枚の
圧電素子板１ａの一面に金属板１ｂを固着したユ
ニモルフ型圧電素子、又は図示しないが２枚の圧
電素子板の間に金属板を固着したバイモルフ型圧
電素子）の略中心部に、例えばコーン型振動板２
の頂部が固着され、当該振動板２の外周縁がフレ
ーム３開口縁に固着されている。又、４は圧電素
子１の両面に形成される＋−電極に接続されたリ
ード線（通常当該リード線の一方は圧電素子板１
ａと電導的に固着された前記金属板１ｂに接続さ
れる）であり、当該リード線４はフレーム３に設
けたスピーカー入力端子５に接続されている。 As shown in FIG. 1, this type of speaker uses a piezoelectric element as a driving part, and uses a piezoelectric element 1 (for example, a unimorph type piezoelectric element in which a metal plate 1b is fixed to one surface of a piezoelectric element plate 1a, or a piezoelectric element (not shown)). For example, a cone-shaped diaphragm 2 is placed approximately at the center of a bimorph piezoelectric element (a bimorph piezoelectric element in which a metal plate is fixed between two piezoelectric element plates).
The top of the diaphragm 2 is fixed, and the outer peripheral edge of the diaphragm 2 is fixed to the opening edge of the frame 3. Further, 4 is a lead wire connected to the + and - electrodes formed on both sides of the piezoelectric element 1 (usually one of the lead wires is connected to the piezoelectric element plate 1).
The lead wire 4 is connected to a speaker input terminal 5 provided on the frame 3.
そして、当該入力端子５に音声電気信号を入力
することにより圧電素子１を屈曲振動せしめ、こ
の振動により振動板２より音波を放射せしめるも
のである。 By inputting an audio electrical signal to the input terminal 5, the piezoelectric element 1 is caused to bend and vibrate, and this vibration causes the diaphragm 2 to radiate sound waves.
この様はスピーカーを設計する上において、ス
ピーカーから放射される音波の最低共振周波数
（以下0と記す）は通常エツジ部を含めた振動板
の形状寸法、ステイフネス等により決定されるわ
けであるが、一方圧電素子はそれ自体の一次共振
周波数（以下1と記す）を前記0よりも低く設定
するのが普通である。 In this way, when designing a speaker, the lowest resonant frequency (hereinafter referred to as 0 ) of the sound waves emitted from the speaker is usually determined by the shape and stiffness of the diaphragm, including the edges. On the other hand, the piezoelectric element generally has its own primary resonance frequency (hereinafter referred to as 1 ) set lower than the above-mentioned 0 .
すなわち、前記0と1が近似すると、共振周波
数において急峻なピークが発生し、その後の周波
数において急峻なデイツプが発生し、さらに二次
共振周波数に於て急峻にピークが生じるというよ
うに平坦なる周波数特性が得られない。 In other words, when 0 and 1 are approximated, a steep peak occurs at the resonant frequency, a steep dip occurs at subsequent frequencies, and then a steep peak occurs at the secondary resonant frequency, resulting in a flat frequency. Characteristics cannot be obtained.
したがつて、一般には1（振動板の重量による
1の変化であつて1より多少低い周波数となる）
と、0及び圧電素子の二次共振周波数2との関係
は1＜0＜2とするように設計する。 Therefore, in general, 1 (depending on the weight of the diaphragm)
1 , and the frequency is slightly lower than 1 )
The relationship between 0 and the secondary resonance frequency 2 of the piezoelectric element is designed so that 1 < 0 < 2 .
一方、0以下の周波数帯では振動板２は振動せ
ず圧電素子１のみが屈曲振動を起こす。この振動
により圧電素子自体から放射される音波、又これ
によるフレームの共振、リード線のビビリ音等が
歪音として聴取され特に圧電素子の一次共振時に
おいて聴感を著しく害する欠点を有していた。 On the other hand, in the frequency band below 0 , the diaphragm 2 does not vibrate and only the piezoelectric element 1 causes bending vibration. Due to this vibration, the sound waves radiated from the piezoelectric element itself, as well as the resulting resonance of the frame and chatter of the lead wire, can be heard as distorted sounds, which has the disadvantage of significantly impairing the sense of hearing, especially during the primary resonance of the piezoelectric element.
この欠点を解決する為に第２図に示すごとく、
フレーム３底面と圧電素子１との間に制動材２１
を介入固着せしめたスピーカーが考案されてお
り、制動材２１の縦方向の圧縮、伸張による制動
作用によつて、ある程度の効果を有することが確
かめられている。 In order to solve this drawback, as shown in Figure 2,
Braking material 21 between the bottom of the frame 3 and the piezoelectric element 1
A speaker has been devised in which the damping member 21 is interposed and fixed, and it has been confirmed that the braking action by longitudinal compression and expansion of the damping material 21 has a certain degree of effectiveness.
しかるにこの様な構造ではフレーム３、振動板
２、圧電素子１、制動材２１が一体に固着されて
いるため、当該部品の寸法、特に高さ方向に正確
なる寸法精度が要求される上に、組立が複雑にな
る欠点を有する。 However, in such a structure, since the frame 3, diaphragm 2, piezoelectric element 1, and damping material 21 are fixed together, the dimensions of the parts, especially in the height direction, are required to be accurate, and It has the disadvantage that assembly is complicated.
そこで、この考案では第２図における制動作用
をさらに良好にするとともに、寸法の許容誤差が
拡大され、かつ組立が容易な圧電型スピーカーの
構造であつて、第３図以下に示す実施例について
詳しく説明する。 Therefore, in this invention, we have developed a piezoelectric speaker structure that further improves the braking action shown in Fig. 2, expands the dimensional tolerance, and is easy to assemble. explain.
第３図において１，２，３はそれぞれ従来例と
同様の圧電素子、振動板、フレームである。３１
は第４図ｂ，ｃに示すように前記圧電素子１の下
面において当該圧電素子の第一共振モード（同図
ａ）における腹となる部分に固着した円環形状の
制動材であり、３２は当該制動材３１の下面に固
着した剛体板である。当該剛体板３２は真鍮、ア
ルミのごとき金属板、又は硬質プラスチツクが適
当である。 In FIG. 3, numerals 1, 2, and 3 are a piezoelectric element, a diaphragm, and a frame, respectively, which are similar to the conventional example. 31
As shown in FIGS. 4b and 4c, 32 is an annular damping material fixed to the bottom surface of the piezoelectric element 1 at the antinode in the first resonance mode (a in the same figure) of the piezoelectric element, and 32 This is a rigid plate fixed to the lower surface of the braking material 31. The rigid plate 32 is suitably a metal plate such as brass, aluminum, or hard plastic.
当該構成によれば、特に圧電素子１の第一次共
振時に最も振幅の大きくなる振動モードの腹とな
る部分において、制動材の縦方向の圧縮、伸張に
よる制動作用が加わつて、当該共振を抑制するこ
とができる。 According to this configuration, especially in the antinode part of the vibration mode where the amplitude is the largest during the first resonance of the piezoelectric element 1, the damping action by longitudinal compression and expansion of the damping material is added, suppressing the resonance. can do.
第５図は他の実施例であり、ｂ，ｃのように圧
電素子１の第二次共振モード（同図ａ）における
腹となる部分に円環形状の制動材４２を固着し、
当該制動材４１の下面に剛体板３２を固着した構
成で第二次共振の抑制効果を目的とするものであ
る。 FIG. 5 shows another embodiment, in which an annular damping material 42 is fixed to the antinode portion of the piezoelectric element 1 in the second resonance mode (a in the same figure) as shown in b and c,
The rigid plate 32 is fixed to the lower surface of the damping material 41, and the purpose is to suppress secondary resonance.
以上に説明したごとく、この考案は振動板２の
頂部に圧電素子１の中心部を固着懸下し、振動板
２の外周縁をフレーム３の開口縁に固着した圧電
型スピーカーにおいて、前記圧電素子１の下面の
当該圧電素子の第一共振又は第二共振における振
動モードの腹となる部分に円環形状の制動材を、
更に当該制動材の下面に剛体板をそれぞれ固着し
た構造を有し、圧電素子の共振を効果的に抑制
し、当該共振による歪音の発生を抑制し、佳良な
る再生音の聴取を可能にすると共に、厳密な寸法
精度が要求されず、かつ組立てが簡単であるので
安価な均一した製品を提供できるなど実用的に極
めて優れた効果を有する。 As explained above, this invention provides a piezoelectric speaker in which the center of the piezoelectric element 1 is fixedly suspended from the top of the diaphragm 2, and the outer peripheral edge of the diaphragm 2 is fixed to the opening edge of the frame 3. An annular damping material is placed on the bottom surface of the piezoelectric element in the part that becomes the antinode of the vibration mode in the first resonance or the second resonance,
Furthermore, it has a structure in which rigid plates are fixed to the lower surface of the damping member, which effectively suppresses the resonance of the piezoelectric element and suppresses the generation of distorted sound due to the resonance, making it possible to listen to excellent reproduced sound. In addition, it does not require strict dimensional accuracy and is easy to assemble, so it has extremely excellent practical effects such as being able to provide inexpensive and uniform products.
また、剛体板のステイフネスを適宜選択するこ
とにより制動材を含めた複合的な制動作用を得る
ことができる。 Further, by appropriately selecting the stiffness of the rigid plate, a composite braking action including a braking material can be obtained.
第１図及び第２図はそれぞれ従来の圧電型スピ
ーカーの断面図、第３図はこの考案実施例の圧電
型スピーカーの断面図、第４図及び第５図はそれ
ぞれこの考案実施例の圧電型スピーカーのａは振
動モードを示す図、ｂは圧電素子部分の断面図、
ｃは制動材と剛体板の正面図である。
１：圧電素子、２：振動板、３：フレーム。
1 and 2 are sectional views of a conventional piezoelectric speaker, FIG. 3 is a sectional view of a piezoelectric speaker according to an embodiment of this invention, and FIGS. 4 and 5 are sectional views of a piezoelectric speaker according to an embodiment of this invention. A of the speaker is a diagram showing the vibration mode, b is a cross-sectional diagram of the piezoelectric element part,
c is a front view of the damping material and the rigid plate. 1: piezoelectric element, 2: diaphragm, 3: frame.
Claims (1)
縁に外周部を固着した振動板２と当該振動板２の
頂部に略中央部を固着懸下した圧電素子１よりな
るスピーカーにおいて、前記圧電素子１の下面の
圧電素子１の第一共振又は第二共振における振動
モードの腹となる部分に円環形状制動材が固着さ
れ、当該制動材の下面に剛体板が固着されている
ことを特徴とする圧電型スピーカー。 In a speaker comprising at least a frame 3, a diaphragm 2 whose outer periphery is fixed to the opening edge of the frame 3, and a piezoelectric element 1 whose substantially central part is fixed and suspended from the top of the diaphragm 2, the lower surface of the piezoelectric element 1 is A piezoelectric speaker characterized in that an annular damping material is fixed to the antinode of the vibration mode in the first resonance or second resonance of the piezoelectric element 1, and a rigid plate is fixed to the lower surface of the damping material. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14164982U JPS5946095U (en) | 1982-09-18 | 1982-09-18 | piezoelectric speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14164982U JPS5946095U (en) | 1982-09-18 | 1982-09-18 | piezoelectric speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5946095U JPS5946095U (en) | 1984-03-27 |
| JPS636956Y2 true JPS636956Y2 (en) | 1988-02-27 |
Family
ID=30316751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14164982U Granted JPS5946095U (en) | 1982-09-18 | 1982-09-18 | piezoelectric speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5946095U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61150500A (en) * | 1984-12-24 | 1986-07-09 | Sawafuji Dainameka Kk | Composite type piezoelectric speaker |
| JP4605395B2 (en) * | 2006-04-04 | 2011-01-05 | 日本電気株式会社 | Speaker |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6221118U (en) * | 1985-07-18 | 1987-02-07 |
-
1982
- 1982-09-18 JP JP14164982U patent/JPS5946095U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6221118U (en) * | 1985-07-18 | 1987-02-07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5946095U (en) | 1984-03-27 |
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