JPS58150400A - Piezoelectric sound generator - Google Patents
Piezoelectric sound generatorInfo
- Publication number
- JPS58150400A JPS58150400A JP3289282A JP3289282A JPS58150400A JP S58150400 A JPS58150400 A JP S58150400A JP 3289282 A JP3289282 A JP 3289282A JP 3289282 A JP3289282 A JP 3289282A JP S58150400 A JPS58150400 A JP S58150400A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- disk
- sounding body
- diaphragm
- nickel alloy
- 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.)
- Pending
Links
- 229910000990 Ni alloy Inorganic materials 0.000 claims abstract description 9
- 239000000919 ceramic Substances 0.000 claims abstract description 7
- 229910020698 PbZrO3 Inorganic materials 0.000 abstract description 2
- 229920006332 epoxy adhesive Polymers 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 2
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 2
- 229910052759 nickel Inorganic materials 0.000 abstract 1
- 229910001369 Brass Inorganic materials 0.000 description 4
- 239000010951 brass Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 235000009754 Vitis X bourquina Nutrition 0.000 description 1
- 235000012333 Vitis X labruscana Nutrition 0.000 description 1
- 235000014787 Vitis vinifera Nutrition 0.000 description 1
- 240000006365 Vitis vinifera Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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)
Abstract
Description
【発明の詳細な説明】
本発明は圧電ブザー、圧電スピーカなどに有用な圧電発
音体に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric sounding body useful for piezoelectric buzzers, piezoelectric speakers, and the like.
圧電ブザー、圧電スピーカなどに使用される圧電発音体
は、一般的に、真ちゅう板あるいはステンレス鋼板から
なる金属振動板の一方面もしくは両方面に、誘電率及び
電気−機械結合係数の大きいＰＺＴ系セラミクス圧電板
が接着剤により接着された、ユニモルフ構造もしくはバ
イモルフ構造を用いている。Piezoelectric sounding bodies used in piezoelectric buzzers, piezoelectric speakers, etc. are generally made of a metal diaphragm made of brass or stainless steel, and PZT-based ceramics with a high dielectric constant and high electro-mechanical coupling coefficient are used on one or both sides of the metal diaphragm. A unimorph or bimorph structure is used in which piezoelectric plates are bonded with adhesive.
このような圧電発音体は、真ちゅう板、ステンレス鋼板
などの金属振動板に、誘電率及び電気−機械結合係数の
大きいＰＺＴ圧電板を接着しているので、可聴周波数域
で得られる音圧が大きくなり、ブザーやスピーカ用とし
て好ましいも−のである。しかし、上記構造の圧電発音
体は、第１図（ａ）に示すように、振動板１に直径２１
−１厚み０．１ｍｍの真ちゅう円板を、圧電板２に直径
１４−１厚み０゜１１１１のＰＺＴ円板を用いたユニモ
ルフ構造とした場合、その圧電発音体の共振周波数一温
度特性が第３図の破線で示すようになる。また、この圧
電発音体を例えばノードラインで支持し、２５℃で最大
音圧レベルが得られるように発音体の共振周波数とブザ
ーケースの共鳴周波数とを一致させて圧電ブザーを構成
すると、得られる音圧レベル一温度特性が第４図の破線
で示すようになる。つまり、第３，４図に示した温度範
囲においては、周囲潤度の上昇にともなって共振周波数
が大きく低下するとともに、音圧レベルが最大レベルの
２５℃を返し行ったところ、実験に用いた真ちゅう振動
板とＰＺＴ圧電板の熱膨張係数が、それぞれ約２０×１
０−８ ／’Ｃ１約２ｘ １０−８ ／’Ｃと異なって
いるので、周囲ＦｊＡ度の変化が多層構造の発音体の反
りとなってあられれ、この反りが共振周波数の変化をＪ
いているものと判断できた。上記圧電発音体の反りは、
振動板と圧電板の接着瀉麿（例えば８０℃〜１２０℃）
近傍では元々の状態で反りがなく、その温度より低温側
では同図（ｂ）のように振動板側に反り、高温側では同
図（Ｃ）のように圧電板側に反る。接看潰度近傍を境に
して同図（ｂ）、（Ｃ）のように圧電発音体に反りが生
ずると、いずれの側でも共振周波数が同図（ｄ ）に示
すように高くなる傾向を示す。したがって、接着温度以
下の温度範囲で前述した第３図の破線のような共振周波
数一温度特性となる。一方、音圧レベルについては、共
振周波数が変化するとブザーケースの共鳴周波数との共
鳴点がずれてしまうので、音圧レベルが第４図の破線で
示すように低下する。Such piezoelectric sounding elements have a PZT piezoelectric plate with a high dielectric constant and electromechanical coupling coefficient bonded to a metal diaphragm such as a brass plate or stainless steel plate, so the sound pressure obtained in the audible frequency range is large. Therefore, it is preferable for use as a buzzer or speaker. However, as shown in FIG. 1(a), the piezoelectric sounding body with the above structure has a diameter of 21
-1 When a brass disc with a thickness of 0.1 mm is made into a unimorph structure using a PZT disc with a diameter of 14-1 and a thickness of 0° and 1111 as the piezoelectric plate 2, the resonant frequency-temperature characteristic of the piezoelectric sounding body is the third The result will be as shown by the broken line in the figure. Furthermore, if this piezoelectric sounding body is supported by, for example, a node line, and the resonant frequency of the sounding body is matched with that of the buzzer case so that the maximum sound pressure level is obtained at 25 degrees Celsius, a piezoelectric buzzer is constructed. The sound pressure level-temperature characteristic is as shown by the broken line in FIG. In other words, in the temperature range shown in Figures 3 and 4, the resonance frequency decreases significantly as the ambient humidity increases, and when the sound pressure level is returned to its maximum level of 25℃, the The thermal expansion coefficients of the brass diaphragm and PZT piezoelectric plate are approximately 20×1.
0-8 /'C1 is different from about 2x 10-8 /'C, so a change in the surrounding FjA degree causes a warp in the multilayer sounding body, and this warp causes a change in the resonant frequency to
I was able to determine that it was there. The warpage of the above piezoelectric sounding body is
Adhesion between diaphragm and piezoelectric plate (e.g. 80℃~120℃)
In the vicinity, there is no warpage in the original state, but at a temperature lower than that temperature, it warps toward the diaphragm, as shown in FIG. When warping occurs in the piezoelectric sounding body as shown in Figures (b) and (C) near the degree of contact collapse, the resonance frequency tends to increase on either side as shown in Figure (d). show. Therefore, in the temperature range below the bonding temperature, the resonant frequency-temperature characteristic as shown by the broken line in FIG. 3 described above is obtained. On the other hand, regarding the sound pressure level, if the resonance frequency changes, the resonance point with the resonance frequency of the buzzer case shifts, so the sound pressure level decreases as shown by the broken line in FIG. 4.
また、発音体の外周部を支持して圧電ブザーを構成した
場合も、発音体の共振周波数の変化により音圧レベルが
低下する。さらに、温度変化により発音体の反りが大き
くなった場合、圧電板にクラック、ヒビ割れなどが生ず
る危険性がある。Furthermore, when a piezoelectric buzzer is constructed by supporting the outer circumference of the sounding body, the sound pressure level decreases due to a change in the resonance frequency of the sounding body. Furthermore, if the warping of the sounding body increases due to temperature changes, there is a risk that cracks, cracks, etc. will occur in the piezoelectric plate.
そこで本発明は、ＰＺＴ系圧電セラミクスの熱膨張係数
とほぼ等しい熱膨張係数をもつニッケル合金で振動板を
構成して、温度変化に対する発音体の反りをできる限り
なくし、音圧レベル一温度特性を平担にするようにした
圧電発音体である。Therefore, the present invention consists of a diaphragm made of a nickel alloy whose coefficient of thermal expansion is almost the same as that of PZT-based piezoelectric ceramics, thereby minimizing the warping of the sounding body due to temperature changes, and improving the sound pressure level-temperature characteristics. It is a piezoelectric sounding body designed to be flat.
以下、本発明の実施例を図面を参照しつつ詳述する。Embodiments of the present invention will be described in detail below with reference to the drawings.
第２図（ａ ）は本発明による圧電発音体１０を示し、
同図において、１１はＰｂＴ ｔ ０３−ＰｂＺｒＯ３
を主体とした２成分系あるいは３成分系などのＰＺＴ系
圧電セラミクスからなる圧電円板で、その熱１１眼係数
は組成比率を変えてもほぼ１．０〜５、ＯＸ １０−６
／’Ｃの範囲にある。この圧電円板１１の両面には電
極１２．１３が形成されている。１４はニッケル合金か
らなる振動円板であり、この振動円板１４のニッケル合
金は、Ｎｉの成分比率が高い、ＦｅとＮ１を主体とする
高ニッケル合金で、具体的には、Ｆｅが５４重量％、Ｎ
：が２９重量％、Ｃ０が１７重量％の２９Ｎ ｉ −１
７Ｃｏ −Ｆ ｅ合金、もしくｅ合金が好ましく、場合
によってはＭＯ，Ｃｒなどを添加してもよい。これらの
高ニッケル合金の熱１ｉ！脹係数はほぼ３．５〜７，５
ｘｌＯ−８／’Ｃの範囲にある。この振動円板１４と
圧電円板１１とが例えば２液漏合性熱硬化型エポキシ系
接着剤１５にて接着され、振動円板１４と外側の電極１
２とにリード線が半田付けされている。この圧電発音体
１０は第２図（ｂ）に示すように、ブザーケース１６に
ノードライン支持構造で取り付けられている。上記圧電
発音体１０の圧電円板１１と振動円板１４の寸法を前述
した従来例と同一寸法に設定すると、圧電発音体の共振
周波数一温度特性が第３図の実線のようになり、周囲温
度が変化しても共振層、波数はほとんど変化しない。ま
た、ブザーの音圧レベル一温度特性は第４図の実線のよ
うになり、音圧レベルも周囲Ｉ！度に対しほとんど変化
しない。さらに、圧電発音体１０がこの実施例のように
ユニモルフ構造でかつ振動板１４側が放音孔に向いてい
る場合、振動板１４が外部雰囲気に直接触れるが、高ニ
ッケル合金の振動板１４が従来の輿らゆう板、ステンレ
ス鋼板に比べて耐腐食性などが優れているので、経時変
化の少ないブザーが得られる。FIG. 2(a) shows a piezoelectric sounding body 10 according to the present invention,
In the same figure, 11 is PbT t 03-PbZrO3
It is a piezoelectric disk made of PZT piezoelectric ceramics, such as a two-component system or a three-component system, mainly consisting of OX 10-6, and its thermal coefficient is approximately 1.0 to 5 even if the composition ratio is changed.
/'C range. Electrodes 12.13 are formed on both sides of this piezoelectric disk 11. 14 is a vibrating disk made of a nickel alloy. The nickel alloy of the vibrating disk 14 is a high nickel alloy mainly composed of Fe and N1 with a high Ni component ratio. Specifically, Fe is 54% by weight. %, N
29N i -1 with : 29% by weight and C0 17% by weight
7Co-Fe alloy or e alloy is preferable, and MO, Cr, etc. may be added depending on the case. Thermal 1i of these high nickel alloys! The swelling coefficient is approximately 3.5 to 7.5
It is in the range of xlO-8/'C. The vibrating disk 14 and the piezoelectric disk 11 are bonded together using, for example, a two-liquid leakage thermosetting epoxy adhesive 15, and the vibrating disk 14 and the outer electrode 1
Lead wires are soldered to 2 and 2. As shown in FIG. 2(b), this piezoelectric sounding body 10 is attached to a buzzer case 16 with a node line support structure. When the dimensions of the piezoelectric disc 11 and the vibrating disc 14 of the piezoelectric sounding body 10 are set to be the same as those of the conventional example described above, the resonance frequency-temperature characteristic of the piezoelectric sounding body becomes as shown by the solid line in FIG. Even if the temperature changes, the resonance layer and wavenumber hardly change. Also, the sound pressure level vs. temperature characteristic of the buzzer is as shown by the solid line in Figure 4, and the sound pressure level is also around I! There is almost no change in temperature. Furthermore, when the piezoelectric sounding body 10 has a unimorph structure as in this embodiment and the diaphragm 14 side faces the sound emission hole, the diaphragm 14 comes into direct contact with the external atmosphere. It has superior corrosion resistance compared to stainless steel plates and stainless steel plates, so you can get a buzzer with less deterioration over time.
上記実施例はユニモルフ構造の圧電発音体を示している
が、振動板の両面にそれぞれ圧電板を接着したバイモル
フ構造にしてもよく、また圧電発音体はノードライン支
持に限らず外周支持など任意の方法で取り付けることが
できる。また、本発明の圧電発音体はブザーに限らず、
スピーカにも用いることができる。Although the above embodiment shows a piezoelectric sounding body with a unimorph structure, it may also have a bimorph structure in which piezoelectric plates are bonded to both sides of the diaphragm.Also, the piezoelectric sounding body is not limited to node line support, but can be supported in any desired manner, such as peripheral support. It can be installed in any way. Furthermore, the piezoelectric sounding body of the present invention is not limited to buzzers.
It can also be used as a speaker.
本発明は、以上説明したように、熱１１脹係数のほぼ等
しい、ニッケル合金の振動板とＰＺＴ系圧電セラミクス
の圧電板とで構成しているので、共振周波数一温度特性
が平担になり、得られる音圧レベル一温度特性も平担に
なるとともに、周囲温度が変化しても圧電板にクラック
や割れが生ずる危険性もほとんどなくなる。As explained above, the present invention is composed of a nickel alloy diaphragm and a PZT-based piezoelectric ceramic piezoelectric plate, both of which have approximately the same thermal expansion coefficient, so that the resonance frequency-temperature characteristics are even. The resulting sound pressure level-temperature characteristic becomes even, and there is almost no risk of cracks or fractures occurring in the piezoelectric plate even if the ambient temperature changes.
第１図は従来例を示し、同図（ａ ＞は発音体の−湯度
特性図、第２図（ａ）は本発明による発音体の一実施例
を示す断面図、同図（１））は上記実施例の発音体を組
み込んだブザーの断面図、第３図は従来例及び本発明に
よる圧電発音体の共振周波数−湯度特性図、第４図は従
来例及び本発明による圧電発音体を組み込んだブザーの
音圧レベル−湯度特性図である。
特 許 出 願 人
株式会社村田製作所
第ｆ目
（１）
！Ｊｌ温度龜
（ｂ）
、ユニ２＝＝＝＝＝＝＝＝＝ミミミミト５．５
イ地（異譚ｉＡイ側（Ｃ）
（ｄ）
手 続 補 正 書
昭和５７年 ７月１９日
１、事件の表示
昭和５７年特 許 願第３２８９２号
２、発明の名称
、圧電発音体
３、補正をする者
事件との関係 特許出願人
住所 京都府長岡京市天神二丁目２６番１０号名称 （
６２３）株式会社 村 １）製 作 所昭和５７年６月
２９日（発送日）
５、補正によ、り増加する発明の数
箱１図を別紙のとおり補正する。
葡 １ 図
（久）
（ｂ）
一三＝＝ミミζ
（Ｃ）
（ｄ）FIG. 1 shows a conventional example; FIG. ) is a sectional view of a buzzer incorporating the sounding body of the above embodiment, FIG. 3 is a resonant frequency-temperature characteristic diagram of the piezoelectric sounding body according to the conventional example and the present invention, and FIG. 4 is a piezoelectric sounding body according to the conventional example and the present invention. It is a sound pressure level-hot water characteristic diagram of a buzzer incorporating a body. Patent applicant Murata Manufacturing Co., Ltd. Item F (1)! Jl temperature gun (b), Uni 2=========Mimi Mimi 5.5
A (different story) A side (C) (d) Procedural amendment Written on July 19, 1982 1, Indication of the case 1982 Patent Application No. 32892 2, Title of the invention, Piezoelectric sounding body 3 , Relationship with the case of the person making the amendment Patent applicant address 2-26-10 Tenjin, Nagaokakyo City, Kyoto Prefecture Name (
623) Mura Co., Ltd. 1) Manufactured June 29, 1980 (shipment date) 5. The number of boxes and drawings of the inventions that will be increased due to the amendment will be amended as shown in the attached sheet. Grape 1 Figure (ku) (b) Ichizo==Mimiζ (C) (d)
Claims (1)
からなる圧電板を接着してなる圧電発音体。A piezoelectric sounding body made by bonding a piezoelectric plate made of PZT piezoelectric ceramics to a diaphragm made of a nickel alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3289282A JPS58150400A (en) | 1982-03-01 | 1982-03-01 | Piezoelectric sound generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3289282A JPS58150400A (en) | 1982-03-01 | 1982-03-01 | Piezoelectric sound generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58150400A true JPS58150400A (en) | 1983-09-07 |
Family
ID=12371532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3289282A Pending JPS58150400A (en) | 1982-03-01 | 1982-03-01 | Piezoelectric sound generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58150400A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63102600A (en) * | 1986-10-20 | 1988-05-07 | Matsushita Electric Ind Co Ltd | Piezoelectric buzzer |
| US4783821A (en) * | 1987-11-25 | 1988-11-08 | The Regents Of The University Of California | IC processed piezoelectric microphone |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5377485A (en) * | 1976-12-21 | 1978-07-08 | Seiko Instr & Electronics Ltd | Production of piezo-vibrator |
| JPS5479116A (en) * | 1977-12-07 | 1979-06-23 | Hitachi Ltd | Highly elastic alloy |
-
1982
- 1982-03-01 JP JP3289282A patent/JPS58150400A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5377485A (en) * | 1976-12-21 | 1978-07-08 | Seiko Instr & Electronics Ltd | Production of piezo-vibrator |
| JPS5479116A (en) * | 1977-12-07 | 1979-06-23 | Hitachi Ltd | Highly elastic alloy |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63102600A (en) * | 1986-10-20 | 1988-05-07 | Matsushita Electric Ind Co Ltd | Piezoelectric buzzer |
| US4783821A (en) * | 1987-11-25 | 1988-11-08 | The Regents Of The University Of California | IC processed piezoelectric microphone |
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