JPS603278B2 - piezoelectric speaker - Google Patents
piezoelectric speakerInfo
- Publication number
- JPS603278B2 JPS603278B2 JP15390878A JP15390878A JPS603278B2 JP S603278 B2 JPS603278 B2 JP S603278B2 JP 15390878 A JP15390878 A JP 15390878A JP 15390878 A JP15390878 A JP 15390878A JP S603278 B2 JPS603278 B2 JP S603278B2
- Authority
- JP
- Japan
- Prior art keywords
- resonance
- sound pressure
- output sound
- piezoelectric
- pressure level
- 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
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 5
- 230000010287 polarization Effects 0.000 description 4
- 241000277331 Salmonidae Species 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Description
【発明の詳細な説明】
本発明は圧電／ゞィモルフ素子の第２次共振時の出力音
圧レベルのピーク発生を抑制し、出力音圧周波数特性の
平坦化を計ろうとする圧電形スピーカに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric speaker that suppresses the occurrence of peaks in the output sound pressure level during the second resonance of a piezoelectric/dimorph element and flattens the output sound pressure frequency characteristics. It is.
従来の圧電形スピーカとしては、第１図に示すように構
成されていた。A conventional piezoelectric speaker has a structure as shown in FIG.
すなわち、圧電バイモルフ素子１の片面にゴム系の制動
材２を接着し、他面にコーン状の振動板３を接合し、こ
れを合成樹脂や金属よりなるフレーム４に組込んで構成
されていた。That is, a rubber damping material 2 is bonded to one side of a piezoelectric bimorph element 1, a cone-shaped diaphragm 3 is bonded to the other side, and this is assembled into a frame 4 made of synthetic resin or metal. .
このような構成による氏電形スピーカの出力音圧周波数
特性は第５図の破線のようになり、第２次共振の出力音
圧レベルａは、第１次共振の出力音圧レベルｂに比較し
てきわめて高い値となっていた。The output sound pressure frequency characteristic of the Ujiden type speaker with such a configuration is as shown by the broken line in Figure 5, and the output sound pressure level a of the second resonance is compared with the output sound pressure level b of the first resonance. It was an extremely high value.
これは、圧電バィモルフ素子１内部の力係数および内部
機械損失が第１次共振に比較し第２次共振の方が大きい
。すまり、力係数が約４倍、内部機械損失が約１針音と
なっているためである。したがって制動材２は圧電バィ
モルフ素子１に直列に接続された抵抗として効果を示す
ため、全体の出力音圧レベルの低下および特に第１次共
振のＱの減少効果はあるが第２次共振のＱの減少効果は
少ないものとなっていた。また、第２次共振周波数は、
第１次共振周波数の約４倍の値と間隔が広く共振間の出
力音圧レベルが大きく蓬下する欠点があった。本発明は
以上のような従来の欠点を除去するものである。This is because the force coefficient and internal mechanical loss inside the piezoelectric bimorph element 1 are larger in the second resonance than in the first resonance. This is because the force coefficient is approximately 4 times higher and the internal mechanical loss is approximately 1 stitch. Therefore, since the damping material 2 exhibits an effect as a resistor connected in series with the piezoelectric bimorph element 1, it has the effect of reducing the overall output sound pressure level and especially the Q of the first resonance, but the Q of the second resonance. The reduction effect was small. Also, the second resonance frequency is
It has the disadvantage that the value is about four times the first resonance frequency and the interval is wide, causing the output sound pressure level between the resonances to drop significantly. The present invention eliminates the drawbacks of the prior art as described above.
すなわち、氏電バィモルフ素子の第２次共振の出力音圧
レベルを第１次共振の出力音圧レベルまで低下させると
ともに第１次共振および第２次共振間へ第２の共振系に
よる共振を励起して前記共振間の出力音圧レベルの低下
を防ぎ、出力音圧周波数特性を平坦にしようとするもの
である。That is, the output sound pressure level of the secondary resonance of the electric bimorph element is lowered to the output sound pressure level of the primary resonance, and resonance by the second resonance system is excited between the primary resonance and the secondary resonance. This is intended to prevent the output sound pressure level from decreasing between the resonances and flatten the output sound pressure frequency characteristics.
以下、本発明の実施例を図面第２図〜第４図により説明
する。５は円板状に形成された庄電／ゞィモルフ素子で
、この圧電／ゞィモルフ素子５の片面にはコーン状の振
動板６の中央部が結合され、この振動板６の局縁部は合
成樹脂や金属などによって構成されたフレーム７の周綾
部に接着などにより結合されている。Embodiments of the present invention will be described below with reference to FIGS. 2 to 4 of the drawings. Reference numeral 5 denotes a piezoelectric/dimorph element formed in the shape of a disk. A central part of a cone-shaped diaphragm 6 is coupled to one side of the piezoelectric/dimorph element 5. It is bonded by adhesive or the like to a peripheral portion of a frame 7 made of synthetic resin, metal, or the like.
また、上記圧電バィモルフ素子５の第３図に示す第２次
共振の２つの節輪８，９で囲まれる環状面１０内には円
弧状の幾分極部１１が同一円周上に数個形成されている
。Furthermore, in the annular surface 10 surrounded by the two nodal rings 8 and 9 of the second-order resonance shown in FIG. It is formed.
この無分極部１１は第４図に示すように斜線で示す部分
１２に電極を形成し、鱒分極部１１には檀極を施さない
ことによって容易に形成することもできるし、圧電磁器
板の分極時に鱒分極部１１を形成することもできる。This non-polarized part 11 can be easily formed by forming an electrode in the shaded part 12 as shown in FIG. 4, and not applying any polarization to the trout polarized part 11. Trout polarized portions 11 can also be formed during polarization.
この無分極部１１を設けることによって駆動力を低下さ
せることができ、第２次共振全体の駆動力を減少させ、
この第２次共振時の出力音圧レベルを制御することがで
きる。By providing this non-polarized portion 11, the driving force can be reduced, and the driving force of the entire second resonance is reduced,
The output sound pressure level during this second resonance can be controlled.
また、第４図に示す無分極部１１によって形成される円
形部も１つの共振系となり、幾分極部１１を外縁とした
円板として固有の共振周波数を有する。Further, the circular portion formed by the non-polarized portion 11 shown in FIG. 4 also serves as one resonant system, and has a unique resonant frequency as a disk with the polarized portion 11 as the outer edge.
この共振周波数を圧軍バィモルフ素子５全体の第１次共
振周波数および第２次共振周波数の間に設けるように電
極パターンを設計すれば、第５図に示す実線の出力音圧
周波数特性が得られる。If the electrode pattern is designed so that this resonant frequency is provided between the first resonant frequency and the second resonant frequency of the entire piezoelectric bimorph element 5, the output sound pressure frequency characteristic shown in the solid line shown in FIG. 5 can be obtained.
繁分極部１１の効果によって第２次共振の出力音圧レベ
ルをＣまで低くすることができ、第１次共振の出力音圧
レベルｂとほぼ同じレベルとすることができ、まらに幾
分極部１１による固有共振系の共振出力音圧レベルｅを
両者の中間に得ることができて、全体的に平坦な出力音
圧周波数特性とすることができる。以上のように本発明
の庄電形スピーカは特性上の大きな効果をもち、その構
成も簡単で安価に製作できるなどの利点をもち、工業的
価値の大なるものである。Due to the effect of the multiple polarization section 11, the output sound pressure level of the second resonance can be lowered to C, which is almost the same level as the output sound pressure level b of the first resonance, and it can be made slightly lower. The resonance output sound pressure level e of the natural resonance system due to the pole portion 11 can be obtained between the two, and an overall flat output sound pressure frequency characteristic can be obtained. As described above, the Shoden type speaker of the present invention has great effects in terms of characteristics, has the advantage of being simple in structure and can be manufactured at low cost, and is of great industrial value.
第１図は従来の圧電形スピーカを示す半断面図、第２図
は本発明の圧電形スピーカの一実施例を示す半断面図、
第３図は同スピーカの圧電／ゞィモルフ素子の説明図、
第４図は同圧鰭バィモルフ素子の上面図、第５図は従釆
と本発明の圧電形スピ−力の出力音圧周波数特性図であ
る。
５・・・庄電／ゞィモルフ素子、６…振動板、７・・・
フレーム、８，９…節輪、１０・・・環状面、１１・・
・魚分極部、１２・・・電極。
第１図
第２図
第３図
第４図
第５図FIG. 1 is a half-sectional view showing a conventional piezoelectric speaker, and FIG. 2 is a half-sectional view showing an embodiment of the piezoelectric speaker of the present invention.
Figure 3 is an explanatory diagram of the piezoelectric/dimorph element of the same speaker.
FIG. 4 is a top view of the isobaric fin bimorph element, and FIG. 5 is a diagram of output sound pressure frequency characteristics of the slave and the piezoelectric type speaker of the present invention. 5... Shoden/dimorph element, 6... Vibration plate, 7...
Frame, 8, 9... Node ring, 10... Annular surface, 11...
・Fish polarization part, 12...electrode. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5
Claims (1)
振動板の中央部に圧電バイモルフ素子を結合してなる圧
電形スピーカにおいて、上記圧電バイモルフ素子の第２
次共振の２つの節輪に囲まれる環状面に円弧状の無分極
部を設けたことを特徴とする圧電形スピーカ。1. In a piezoelectric speaker in which a peripheral edge of a diaphragm is connected to a peripheral edge of a frame, and a piezoelectric bimorph element is connected to a center of the diaphragm, the second piezoelectric bimorph element is
A piezoelectric speaker characterized in that an arcuate non-polarized portion is provided on an annular surface surrounded by two sub-resonant nodal rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15390878A JPS603278B2 (en) | 1978-12-12 | 1978-12-12 | piezoelectric speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15390878A JPS603278B2 (en) | 1978-12-12 | 1978-12-12 | piezoelectric speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5579600A JPS5579600A (en) | 1980-06-16 |
| JPS603278B2 true JPS603278B2 (en) | 1985-01-26 |
Family
ID=15572726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15390878A Expired JPS603278B2 (en) | 1978-12-12 | 1978-12-12 | piezoelectric speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS603278B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59111395U (en) * | 1983-01-17 | 1984-07-27 | 沢藤 正 | piezoelectric sound device |
| JPS63287299A (en) * | 1987-05-20 | 1988-11-24 | Nitsuko Corp | Piezoelectric sounding body for speaker |
-
1978
- 1978-12-12 JP JP15390878A patent/JPS603278B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5579600A (en) | 1980-06-16 |
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