JPH0520958B2 - - Google Patents
Info
- Publication number
- JPH0520958B2 JPH0520958B2 JP7064788A JP7064788A JPH0520958B2 JP H0520958 B2 JPH0520958 B2 JP H0520958B2 JP 7064788 A JP7064788 A JP 7064788A JP 7064788 A JP7064788 A JP 7064788A JP H0520958 B2 JPH0520958 B2 JP H0520958B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- frame member
- recess
- plate
- synthetic resin
- 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 - Lifetime
Links
- 229920003002 synthetic resin Polymers 0.000 claims description 11
- 239000000057 synthetic resin Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、圧電素子を用いた圧電スピーカの
容器構造の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the container structure of a piezoelectric speaker using a piezoelectric element.
従来、圧電素子を以て電気信号を音響振動に変
換する電気音響変換器として圧電スピーカが用い
られている。
Conventionally, piezoelectric speakers have been used as electroacoustic transducers that convert electrical signals into acoustic vibrations using piezoelectric elements.
圧電スピーカは、圧電素子の電歪作用を利用し
て振動板を直接駆動することにより、電気信号を
音響振動に変換するため、薄く、偏平で小型、低
消費電力など、動電形スピーカに無い優れた特徴
を持つているが、圧電素子によつて直接振動板を
駆動するという構造による音響特性からメロデイ
アラームや玩具など限られた範囲で用いられて来
た。 Piezoelectric speakers convert electrical signals into acoustic vibrations by directly driving a diaphragm using the electrostrictive effect of piezoelectric elements, so they are thin, flat, compact, and have low power consumption, which electrodynamic speakers do not have. Although it has excellent characteristics, it has been used in a limited range of applications such as melody alarms and toys due to its acoustic characteristics due to the structure in which the diaphragm is directly driven by a piezoelectric element.
ところで、圧電素子をスピーカに用いた場合、
従来、装置の一部に簡易に固着するなどの方法が
取られているため、外装ケースが圧電素子ととも
に振動して不要振動を誘発する共鳴体になるな
ど、忠実度に欠けるものであつた。特に、圧電素
子は、その構造上、振動板の縁部分を以て設置部
材などに固着されているため、その設置空間の構
造や、取付部材が振動板と直接関わり、音質など
に影響を与えることが経験的に知られている。
By the way, when a piezoelectric element is used in a speaker,
Conventionally, methods such as simply fixing it to a part of the device have been used, resulting in a lack of fidelity as the outer case vibrates with the piezoelectric element and becomes a resonator that induces unnecessary vibrations. In particular, due to the structure of the piezoelectric element, the edge of the diaphragm is fixed to the installation member, etc., so the structure of the installation space and the mounting member are directly connected to the diaphragm, which may affect the sound quality etc. known from experience.
そこで、この発明は、圧電変換素子を設置する
容器の構造を改善した圧電スピーカの提供を目的
とする。 Therefore, an object of the present invention is to provide a piezoelectric speaker in which the structure of a container in which a piezoelectric conversion element is installed is improved.
この発明の圧電スピーカは、第１図に示すよう
に、板状部材４に凹部４４を形成し、この凹部４
４の内壁に一定の間隙６０を設けて枠部材６を設
置し、この枠部材６に形成された凹部（透孔６
１）上に凹部（透孔６１）を背面空間６４とする
圧電変換素子２を固着したものである。
As shown in FIG. 1, the piezoelectric speaker of the present invention has a recess 44 formed in the plate member 4, and
The frame member 6 is installed with a certain gap 60 provided on the inner wall of the frame member 4, and the recess (through hole 6) formed in the frame member 6 is
1) A piezoelectric transducer 2 with a recessed portion (through hole 61) as a back space 64 is fixed thereon.
また、この発明の圧電スピーカにおいて、板状
部材４および枠部材６は、発泡性合成樹脂で形成
することができる。 Further, in the piezoelectric speaker of the present invention, the plate-like member 4 and the frame member 6 can be made of foamable synthetic resin.
圧電変換素子２が固着される枠部材６は、板状
部材４の凹部４４に一定の間隙を６０設けて設置
され、圧電変換素子２の背面圧は、枠部材６の凹
部（透孔６１）を以て調整される。そして、圧電
変換素子２は、枠部材６を支持点として自由振動
を生じ、その振動は圧電変換素子２の前面側の空
気を振動させるとともに、その振動は枠部材６を
通して板状部材４に伝達され、枠部材６および板
状部材４を振動させる。したがつて、このように
板状部材４を音響変換部材に含めることにより、
人の声などの再生音について声の特徴を良く表
し、再現性を高めることができるのである。
The frame member 6 to which the piezoelectric transducer 2 is fixed is installed with a certain gap 60 provided in the recess 44 of the plate member 4, and the back pressure of the piezoelectric transducer 2 is determined by the recess (through hole 61) of the frame member 6. will be adjusted accordingly. The piezoelectric transducer 2 generates free vibration using the frame member 6 as a support point, and the vibration vibrates the air on the front side of the piezoelectric transducer 2, and the vibration is transmitted to the plate member 4 through the frame member 6. The frame member 6 and the plate member 4 are vibrated. Therefore, by including the plate member 4 in the acoustic conversion member in this way,
This makes it possible to better represent the characteristics of reproduced sounds such as human voices and improve reproducibility.
そして、板状部材４および枠部材６を発泡性合
成樹脂で形成することによつて、低域特性が改善
される。 By forming the plate member 4 and the frame member 6 from foamable synthetic resin, the low frequency characteristics are improved.
第１図ないし第３図は、この発明の圧電スピー
カの実施例を示す。
1 to 3 show embodiments of the piezoelectric speaker of the present invention.
この圧電スピーカには電気音響変換素子として
の圧電変換素子２が用いられ、この圧電変換素子
２には、電極を兼ねる円形の振動板２１の中心に
セラミツクなどの円板状の圧電素子２２が固着さ
れているとともに、この圧電素子２２の表面にメ
タライズ処理などによつて設置された導電金属層
からなる電極２３が設置されている。圧電変換素
子２は、圧電素子２２を中心にして振動板２１お
よび電極２３からなるサンドイツチ構造を成して
いる。そして、振動板２１および電極２３には、
リード２４，２５が半田付けなどの電気的接続手
段によつて接続され、音響振動に変換すべき電気
信号がリード２４，２５を通して加えられる。 This piezoelectric speaker uses a piezoelectric transducer 2 as an electroacoustic transducer, and a disk-shaped piezoelectric element 22 made of ceramic or the like is fixed to the center of a circular diaphragm 21 that also serves as an electrode. At the same time, an electrode 23 made of a conductive metal layer is provided on the surface of the piezoelectric element 22 by metallization treatment or the like. The piezoelectric transducer 2 has a sandwich structure including a diaphragm 21 and an electrode 23 with the piezoelectric element 22 at the center. The diaphragm 21 and the electrode 23 have
Leads 24 and 25 are connected by electrical connection means such as soldering, and electrical signals to be converted into acoustic vibrations are applied through leads 24 and 25.
この圧電変換素子２を収容する容器として板状
部材４が設置されており、この板状部材４は、本
の表紙などで構成されており、支持体としての背
面部材４１上に中間部材４２を設置し、その上に
表面部材４３を設置したものである。この板状部
材４は、背面部材４１を強固なボール紙、中間部
材４２を合成樹脂シート、表面部材４３を発泡性
合成樹脂板で構成し、さらに表面遮蔽板にボール
紙などを用いる。 A plate-like member 4 is installed as a container for accommodating the piezoelectric transducer 2. This plate-like member 4 is made of a book cover or the like, and an intermediate member 42 is placed on a back member 41 as a support. 1, and a surface member 43 is placed thereon. In this plate-like member 4, the back member 41 is made of strong cardboard, the intermediate member 42 is made of a synthetic resin sheet, the surface member 43 is made of a foamable synthetic resin plate, and furthermore, cardboard or the like is used for the surface shielding plate.
この板状部材４に中間部材４２に到達する深さ
を以て任意の形状の凹部４４が形成され、この実
施例では、長方形の角部を僅かに切り落としてな
る変則的な６角形を成す凹部４４が形成されてい
る。この凹部４４は、一部をスピーカ側、他の部
分をたとえば、ラジオなどの駆動回路４５の収容
空間４６に設定されている。 A recess 44 of an arbitrary shape is formed in this plate member 4 with a depth that reaches the intermediate member 42. In this embodiment, the recess 44 is an irregular hexagon formed by slightly cutting off the corners of a rectangle. It is formed. This recess 44 has a portion set on the speaker side and the other portion set as an accommodation space 46 for a drive circuit 45 such as a radio.
そして、凹部４４には、その形状に対応すると
ともに、その深さに対応した厚みを持つ発泡性合
成樹脂などで形成された枠部材６が、凹部４４の
壁面との間に一定の間隙６０を設けて設置されて
いる。この枠部材６には第２図に示すように圧電
変換素子２の相似形の凹部として透孔６１が形成
されており、この透孔６１の上部側には段部６２
を設けて圧電変換素子２を挿入ための径大部６３
が形成されている。 A frame member 6 made of a foamed synthetic resin or the like having a thickness corresponding to the depth and shape of the recess 44 is placed in the recess 44 to form a certain gap 60 between it and the wall surface of the recess 44 . It is set up and installed. As shown in FIG. 2, a through hole 61 is formed in this frame member 6 as a concave portion having a similar shape to the piezoelectric transducer 2, and a stepped portion 62 is formed on the upper side of this through hole 61.
A large diameter portion 63 for inserting the piezoelectric transducer 2
is formed.
したがつて、第３図に示すように、圧電変換素
子２は、枠部材６上の径大部６３の段部６２に接
着剤などを以て取り付けられ、その背面部に透孔
６１によつて背面空間６４が形成されている。そ
して、図示しないが、この板状部材４の表面に
は、ボール紙や、合成樹脂シートなどからなる遮
蔽部材が設置される。 Therefore, as shown in FIG. 3, the piezoelectric transducer 2 is attached to the stepped portion 62 of the large diameter portion 63 on the frame member 6 with adhesive or the like, and the piezoelectric transducer 2 is attached to the stepped portion 62 of the large diameter portion 63 on the frame member 6 with an adhesive or the like, and the A space 64 is formed. Although not shown, a shielding member made of cardboard, a synthetic resin sheet, or the like is installed on the surface of this plate-like member 4.
このような構成によれば、圧電変換素子２は、
枠部材６に取り付けられ、リード２４，２５間に
加えられる電気信号に応じて、枠部材６を支持点
として音響振動を生じる。そして、その背面圧
は、枠部材６に形成された透孔６１と中間部材４
２とで区画された円筒状の背面空間６４を以て調
整される。また、枠部材６は板状部材４の凹部４
４の内部にその内壁との間に一定の間隙６０を持
たせて設置されているので、圧電変換素子２の振
動は枠部材６を振動させるが、枠部材６から板状
部材４への振動伝達が間隙６０内の空気や背面部
材４１および中間部材４２を通して行われ、適当
なダンパー効果が得られる。 According to such a configuration, the piezoelectric conversion element 2 is
It is attached to the frame member 6 and generates acoustic vibrations using the frame member 6 as a support point in response to an electric signal applied between the leads 24 and 25. The back pressure is applied to the through hole 61 formed in the frame member 6 and the intermediate member 4.
Adjustment is made using a cylindrical back space 64 divided by 2 and 2. Further, the frame member 6 is connected to the recess 4 of the plate-like member 4.
4 with a certain gap 60 between it and the inner wall thereof, the vibration of the piezoelectric transducer 2 causes the frame member 6 to vibrate, but the vibration from the frame member 6 to the plate member 4 Transmission takes place through the air in the gap 60 and through the back member 41 and intermediate member 42, providing a suitable damping effect.
なお、実施例では板状部材４および枠部材６を
発泡性合成樹脂で形成した場合について説明した
が、紙、金属、木やその他の合成樹脂で形成して
もよい。 In the embodiment, the case where the plate member 4 and the frame member 6 are made of foamable synthetic resin has been described, but they may be made of paper, metal, wood, or other synthetic resin.
また、透孔６１は、枠部材６が十分に厚い場合
には、円筒状などの凹部に代えても同様に背面圧
を調整することができる。 In addition, when the frame member 6 is sufficiently thick, the through hole 61 can be replaced with a cylindrical recess to adjust the back pressure in the same way.
圧電変換素子２は、チタン酸鉛とジルコン酸鉛
の２成分系セラミツクを焼結して直径28.5mm、厚
さ0.05mmの圧電素子２２を形成し、これを振動板
２１として直径40mm、厚さ0.20mmの真鍮板に固着
したものを用いた。これを、表面部材４３および
枠部材６を発泡性合成樹脂で形成した第１図に示
す板状部材４に取り付け、また、同様の圧電変換
素子２を従来の円形の支持枠に取り付けたものを
比較例とした。
The piezoelectric transducer 2 is made by sintering two-component ceramic of lead titanate and lead zirconate to form a piezoelectric element 22 with a diameter of 28.5 mm and a thickness of 0.05 mm, and this is used as the diaphragm 21 to form a piezoelectric element 22 with a diameter of 40 mm and a thickness. A piece fixed to a 0.20 mm brass plate was used. This was attached to the plate-like member 4 shown in FIG. 1 in which the surface member 43 and frame member 6 were made of foamable synthetic resin, and a similar piezoelectric transducer 2 was attached to a conventional circular support frame. This was used as a comparative example.
実験によれば、この発明に係る圧電スピーカで
は特性Ａ、比較例では特性Ｂの周波数特性が得ら
れ、比較例では、低音域から高音域の各領域にお
いて急激なレベル低下点P1，P2，P4，P5，P8，
P9、急激なレベル上昇点P6，P11が現れているの
に対し、この発明の圧電スピーカでは、レベル低
下点P3，P7，P10でのレベル低下が見られるもの
の、その他の点P1，P2，P4，P5での極端なレベ
ル低下はなく、なだらかな特性に改善されてい
る。特に、低音域におけるレベルが増強され、ま
た、高音域でのピーク点が抑制され、低音域から
中音域でのレベル増強が得られていることが判
る。 According to experiments, the piezoelectric speaker according to the present invention has a frequency characteristic of characteristic A, and the comparative example has a frequency characteristic of characteristic B, and in the comparative example, sharp level drop points P 1 and P 2 are obtained in each region from the bass to treble range. , P 4 , P 5 , P 8 ,
P 9 , rapid level increase points P 6 , and P 11 appear, whereas in the piezoelectric speaker of the present invention, a level decrease is observed at level decrease points P 3 , P 7 , and P 10 , but other points There is no extreme level drop at points P 1 , P 2 , P 4 , and P 5 , and the characteristics have been improved to a gentle level. In particular, it can be seen that the level in the bass range is enhanced, the peak point in the treble range is suppressed, and the level is enhanced from the bass range to the middle range.
このような特性を持つ各スピーカについて、人
の声を再生し、その再生音を評価した場合、この
発明の圧電スピーカが、音質、音色などの再現性
に優れ、自然な人の声を再現でき、しかも、聞き
易いなどの優れた音響特性を持つことが確認され
た。 When a human voice was reproduced and the reproduced sound was evaluated for each speaker with these characteristics, it was found that the piezoelectric speaker of this invention has excellent reproducibility of sound quality and timbre, and is capable of reproducing natural human voices. Moreover, it was confirmed that it has excellent acoustic characteristics such as easy listening.
以上説明したように、この発明によれば、板状
部材に形成された凹部内に一定の間隙を持つて設
置される枠部材に凹部を形成し、この凹部上に凹
部を以て背面空間として圧電変換素子を設置した
ので、圧電変換素子が枠部材を支持点として自由
振動を生じるとともに、枠部材の凹部によつて背
面圧が調整される結果、人の声などの再生音につ
いて声の特徴を良く表し、再現性を高めることが
できる。
As explained above, according to the present invention, a recess is formed in the frame member that is installed with a certain gap in the recess formed in the plate member, and the recess is used as a back space above the recess for piezoelectric conversion. Since the element is installed, the piezoelectric transducer generates free vibration using the frame member as a support point, and the back pressure is adjusted by the recess of the frame member, which improves the voice characteristics of reproduced sounds such as human voices. expression and improve reproducibility.
また、板状部材および枠部材を発泡性合成樹脂
で形成すれば、低域特性が改善され、人の声など
の再現性を改善することができる。 Furthermore, if the plate-like member and the frame member are made of foamable synthetic resin, the low-frequency characteristics can be improved, and the reproducibility of human voices and the like can be improved.
第１図はこの発明の圧電スピーカの実施例を示
す斜視図、第２図は第１図に示した圧電スピーカ
の分解斜視図、第３図は第１図に示した圧電スピ
ーカの−線断面図、第４図は電気音響変換特
性を示す図である。
２……圧電変換素子、４……板状部材、４４…
…凹部、６……枠部材、６０……間隙、６１……
透孔（凹部）。
FIG. 1 is a perspective view showing an embodiment of the piezoelectric speaker of the present invention, FIG. 2 is an exploded perspective view of the piezoelectric speaker shown in FIG. 1, and FIG. 3 is a cross-section taken along the line - 4 are diagrams showing electroacoustic conversion characteristics. 2... Piezoelectric conversion element, 4... Plate member, 44...
... recess, 6 ... frame member, 60 ... gap, 61 ...
Through hole (recess).
Claims (1)
一定の間隙を設けて枠部材を設置し、この枠部材
に形成された凹部上に凹部を背面空間に設定して
圧電変換素子を固着した圧電スピーカ。 ２ 前記板状部材および枠部材が発泡性合性樹脂
で形成された請求項１記載の圧電スピーカ。[Claims] 1. A recess is formed in a plate member, a frame member is installed with a certain gap provided on the inner wall of the recess, and a recess is set in the back space above the recess formed in the frame member. A piezoelectric speaker with a piezoelectric transducer fixed to it. 2. The piezoelectric speaker according to claim 1, wherein the plate member and the frame member are made of foamable synthetic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7064788A JPH01243700A (en) | 1988-03-24 | 1988-03-24 | Piezoelectric loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7064788A JPH01243700A (en) | 1988-03-24 | 1988-03-24 | Piezoelectric loudspeaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01243700A JPH01243700A (en) | 1989-09-28 |
| JPH0520958B2 true JPH0520958B2 (en) | 1993-03-22 |
Family
ID=13437652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7064788A Granted JPH01243700A (en) | 1988-03-24 | 1988-03-24 | Piezoelectric loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01243700A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4215788B2 (en) * | 2006-08-25 | 2009-01-28 | ホシデン株式会社 | Piezoelectric electroacoustic transducer |
-
1988
- 1988-03-24 JP JP7064788A patent/JPH01243700A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01243700A (en) | 1989-09-28 |
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