JPH04112300U - piezoelectric sounding body - Google Patents
piezoelectric sounding bodyInfo
- Publication number
- JPH04112300U JPH04112300U JP1991022913U JP2291391U JPH04112300U JP H04112300 U JPH04112300 U JP H04112300U JP 1991022913 U JP1991022913 U JP 1991022913U JP 2291391 U JP2291391 U JP 2291391U JP H04112300 U JPH04112300 U JP H04112300U
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- metal diaphragm
- sounding body
- ceramic plate
- electrode
- 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.)
- Withdrawn
Links
- 239000002184 metal Substances 0.000 claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 36
- 239000000919 ceramic Substances 0.000 claims abstract description 23
- 239000011362 coarse particle Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 239000012790 adhesive layer Substances 0.000 abstract description 9
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 7
- 230000002950 deficient Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
(57)【要約】 （修正有）
【目的】 圧電素子の電極と金属振動板とが接着剤層を
介して常に接触し、常に良好な圧電特性が得られるよう
にした圧電発音体を得ること。
【構成】 金属振動板１と、この金属振動板に接着され
た圧電素子２とを備え、この圧電素子は、分極した圧電
セラミックス板３と、この圧電セラミックス板の表裏面
に被覆形成された一対の電極とからなり、前記圧電セラ
ミックス板の少なくとも前記金属振動板側の表面から粗
粒子７が突出している。
(57) [Summary] (with modifications) [Purpose] To obtain a piezoelectric sounding body in which the electrodes of the piezoelectric element and the metal diaphragm are always in contact with each other via an adhesive layer, and good piezoelectric characteristics are always obtained. . [Structure] Comprising a metal diaphragm 1 and a piezoelectric element 2 bonded to the metal diaphragm. Coarse particles 7 protrude from at least the surface of the piezoelectric ceramic plate on the side of the metal diaphragm.
Description
【０００１】0001
この考案は、例えばブザー、サウンダー、スピーカー等に使用することのでき る圧電発音体に関するものである。 This invention can be used for example in buzzers, sounders, speakers, etc. The present invention relates to a piezoelectric sounding body.
【０００２】0002
図３は従来の圧電発音体の断面図、図４は図３の要部拡大図である。これらの 図に示すように、従来の圧電発音体は、金属振動板１と、この金属振動板１に接 着された圧電素子２とからなり、この圧電素子２は、分極した圧電セラミックス 板３と、この圧電セラミックス板３の表裏面に被覆形成された一対の電極４，４ とからなる。 FIG. 3 is a sectional view of a conventional piezoelectric sounding body, and FIG. 4 is an enlarged view of the main part of FIG. 3. these As shown in the figure, a conventional piezoelectric sounding element includes a metal diaphragm 1 and a metal diaphragm 1 connected to the metal diaphragm 1. The piezoelectric element 2 is made of polarized piezoelectric ceramics. A plate 3 and a pair of electrodes 4, 4 coated on the front and back surfaces of the piezoelectric ceramic plate 3. It consists of
【０００３】 ここで、圧電素子２の一方の電極４と金属振動板１とは接着剤層５を部分的に 突き抜けて相互に電気的に接触している。また、一対の電極４，４のうちで、金 属振動板１に接着していない電極４と、金属振動板１にはリード６，６が各々接 続されている。0003 Here, one electrode 4 of the piezoelectric element 2 and the metal diaphragm 1 partially touch the adhesive layer 5. They penetrate through and are in electrical contact with each other. Moreover, among the pair of electrodes 4, 4, gold The electrode 4, which is not bonded to the metal diaphragm 1, and the leads 6, 6 are connected to the metal diaphragm 1, respectively. It is continued.
【０００４】 この圧電発音体は、例えば次のようにして製造される。まず、所定の組成に配 合したセラミックス原料を仮焼して、例えばＰｂＴｉＯ3 −ＰｂＺｒＯ3 を主成 分とする圧電材料を得、この圧電材料を粉砕した後、水およびバインダーを加え て混練し、これをドクターブレード法等で生シートとし、この生シートを所定径 の円板に打ち抜き、これを焼成して圧電セラミックス板とする。[0004]This piezoelectric sounding body is manufactured, for example, as follows. First, a ceramic raw material blended to a predetermined composition is calcined to obtain a piezoelectric material whose main component is, for example, PbTiO 3 -PbZrO 3 , and after pulverizing this piezoelectric material, water and a binder are added and kneaded. is made into a green sheet using a doctor blade method or the like, and this green sheet is punched into a disk of a predetermined diameter, which is then fired to form a piezoelectric ceramic plate.
【０００５】 次に、この圧電セラミックス板の表裏面に銀ペーストを塗布・焼付けて一対の 電極を形成し、この電極に所定の電圧を加えて圧電セラミックス板を分極させて 圧電素子とし、この圧電素子を所定径の円板状金属振動板へ接着剤を介して接着 して圧電発音体とする。[0005] Next, silver paste is applied and baked on the front and back surfaces of this piezoelectric ceramic plate to form a pair of An electrode is formed and a predetermined voltage is applied to this electrode to polarize the piezoelectric ceramic plate. A piezoelectric element is used, and this piezoelectric element is bonded to a disc-shaped metal diaphragm with a predetermined diameter using an adhesive. and make it a piezoelectric sounding body.
【０００６】[0006]
ところで、従来の圧電発音体は、例えば、圧電素子２の一方の電極４と金属振 動板１とが完全に平坦に形成されている場合、接着剤層５が均一な薄層になり、 圧電素子２の一方の電極４と金属振動板１は、接着剤層５を部分的に突き抜けて 相互に接触できず、接着剤層５を介して絶縁状態となり、金属振動板１からの電 気的駆動が起こらず、圧電特性が得られないことがあった。 By the way, in the conventional piezoelectric sounding body, for example, one electrode 4 of the piezoelectric element 2 and a metal vibrator are connected. When the moving plate 1 is formed completely flat, the adhesive layer 5 becomes a uniform thin layer, One electrode 4 of the piezoelectric element 2 and the metal diaphragm 1 partially penetrate the adhesive layer 5. They cannot contact each other and are insulated through the adhesive layer 5, and the electric current from the metal diaphragm 1 is In some cases, piezoelectric properties could not be obtained because piezoelectric drive did not occur.
【０００７】 すなわち、従来の圧電発音体においては、圧電素子２の一方の電極４と金属振 動板１との接着の状況によっては、圧電素子２の一方の電極４と金属振動板１と が相互に接触せず、良好な圧電特性が得られないことがあった。[0007] That is, in the conventional piezoelectric sounding body, one electrode 4 of the piezoelectric element 2 and a metal vibration Depending on the state of adhesion with the moving plate 1, one electrode 4 of the piezoelectric element 2 and the metal diaphragm 1 may may not come into contact with each other, making it impossible to obtain good piezoelectric properties.
【０００８】 この考案は、圧電素子の電極と金属振動板とが接着剤層を介して常に接触し、 常に良好な圧電特性が得られるようにした圧電発音体を得ることを目的とするも のである。[0008] This idea is such that the electrodes of the piezoelectric element and the metal diaphragm are always in contact with each other through an adhesive layer. The aim is to obtain a piezoelectric sounding body that always has good piezoelectric properties. It is.
【０００９】[0009]
この考案に係る圧電発音体は、金属振動板と、この金属振動板に接着された圧 電素子とを備え、この圧電素子は、分極した圧電セラミックス板と、この圧電セ ラミックス板の表裏面に被覆形成された一対の電極とからなり、前記圧電セラミ ックス板の少なくとも前記金属振動板側の表面から粗粒子が突出していることを 特徴とするものである。 The piezoelectric sounding body according to this invention includes a metal diaphragm and a pressure bonded to the metal diaphragm. This piezoelectric element includes a polarized piezoelectric ceramic plate and this piezoelectric sensor. It consists of a pair of electrodes coated on the front and back surfaces of a Lamix board, and the piezoelectric ceramic that coarse particles protrude from at least the surface of the vibration plate on the metal diaphragm side. This is a characteristic feature.
【００１０】 ここで、圧電素子の一方の電極と金属振動板は部分的に接着剤層を突き抜けて 相互に接触し、圧電素子の一方の電極と金属振動板とは常に電気的に導通してい る。また、粗粒子は圧電セラミックス板の材料と同一組成の材料からなることが 好ましい。また、粗粒子は圧電セラミックス板の少なくとも金属振動板側の表面 から突出しておればよく、反対側の面から突出していなくても良く、また内部に 混在していても、また、混在していなくても良い。0010 Here, one electrode of the piezoelectric element and the metal diaphragm partially penetrate the adhesive layer. They are in contact with each other, and one electrode of the piezoelectric element and the metal diaphragm are always electrically conductive. Ru. In addition, the coarse particles may be made of a material with the same composition as the material of the piezoelectric ceramic plate. preferable. In addition, the coarse particles are at least on the surface of the piezoelectric ceramic plate on the metal diaphragm side. It does not need to protrude from the opposite side, and it does not need to protrude from the inside. They may or may not be mixed.
【００１１】[0011]
この考案においては、粗粒子を圧電セラミックス板の少なくとも金属振動板側 の表面から突出させているので、圧電セラミックス板の金属振動板側の電極が粗 粒子の部分で金属振動板側に突出し、圧電素子と金属振動板との接着の際に、圧 電素子と金属振動板と常に接触し、電気的に導通可能となる。 In this invention, the coarse particles are placed at least on the metal diaphragm side of the piezoelectric ceramic plate. Since the electrodes on the metal diaphragm side of the piezoelectric ceramic plate protrude from the surface of the The part of the particle protrudes toward the metal diaphragm, and when bonding the piezoelectric element and metal diaphragm, pressure is applied. The electric element and the metal diaphragm are always in contact and electrically conductive.
【００１２】0012
実施例１ まず、原料となるＰｂ，Ｓｒ，Ｚｒ及びＴｉの各酸化物を秤量し、これらを良 く混合して約７５０〜１０００℃で仮焼し、この仮焼によって得られたものを粉 砕して圧電セラミックスの原料粉体を得た。ここで、原料となるＰｂ，Ｓｒ，Ｚ ｒ及びＴｉの各酸化物は、得られる圧電セラミックスがＰｂx Ｓｒ1-x （Ｚｒy ・Ｔｉ1-y ）Ｏ3 （但し、ｘ＝０．９０〜１．００、ｙ＝０．５０〜０．５４） となるような比率とした。Example 1 First, oxides of Pb, Sr, Zr, and Ti as raw materials were weighed, mixed well, and calcined at about 750 to 1000°C.The calcined product was crushed. A raw material powder for piezoelectric ceramics was obtained. Here, the oxides of Pb, Sr, Zr, and Ti used as raw materials are such that the resulting piezoelectric ceramic is Pb x Sr 1-x (Zr y ·Ti 1-y )O 3 (where x=0.90 ~1.00, y=0.50~0.54).
【００１３】 また、上記と同一組成の圧電セラミックスの原料粉体を焼成し、粒成長させて 粗粉砕することにより粗粒子を得、これを上記の圧電セラミックスの原料粉体に 約１〜４ｗｔ％混合した。[0013] In addition, raw material powder for piezoelectric ceramics with the same composition as above was fired and grain-grown. Coarse particles are obtained by coarse grinding, and these are used as the raw material powder for the piezoelectric ceramics mentioned above. About 1 to 4 wt% was mixed.
【００１４】 次に、粗粒子を混合した原料粉体に水およびバインダーを加え、押出成型又は ドクターブレード成型にて成型して生シートを得、この生シートを所定径の円板 に打抜き、これを約１２００〜１２５０℃の範囲にて焼成して圧電セラミックス 板を得た。[0014] Next, water and a binder are added to the raw material powder mixed with coarse particles, and extrusion molding or A raw sheet is obtained by molding using a doctor blade molding method, and this raw sheet is formed into a disc with a predetermined diameter. Piezoelectric ceramics are punched out and fired at a temperature of about 1200 to 1250°C. Got the board.
【００１５】 次に、この圧電セラミックス板の表裏面に銀ペーストを印刷し、焼き付けて電 極とした後、エポキシ系又はＵＶ硬化性樹脂を接着剤として所定径の円板状合金 金属板へ圧着せしめ、図１及び図２に示すような圧電発音体を得た。これらの図 中において、７は粗粒子であり、これ以外の部分は図３及び図４と同一である。[0015] Next, silver paste is printed on the front and back sides of this piezoelectric ceramic plate and baked to create an electric current. After forming the pole, a disc-shaped alloy of a predetermined diameter is attached using epoxy or UV curable resin as an adhesive. It was crimped onto a metal plate to obtain a piezoelectric sounding body as shown in FIGS. 1 and 2. these diagrams Among them, 7 is a coarse particle, and the other parts are the same as in FIGS. 3 and 4.
【００１６】 次に、この圧電発音体の圧電特性（インピーダンスの周波数特性）を測定した ところ、殆んどの圧電発音体は、共振点及び反共振点が所定周波数範囲内で測定 され、良品であり、共振点及び反共振点が測定されない不良品は５％以下であっ た。[0016] Next, we measured the piezoelectric characteristics (frequency characteristics of impedance) of this piezoelectric sounding body. However, for most piezoelectric sounding bodies, the resonance point and anti-resonance point are measured within a predetermined frequency range. The number of good products and the number of defective products for which the resonance point and anti-resonance point cannot be measured are less than 5%. Ta.
【００１７】 比較例１ 一方、比較例として、粗粒子を含まないセラミックス粉体を用いて押出成型又 はドクターブレード成型にて生シートを作成し、実施例１と同一条件にて圧電素 子を得、これを同一条件にて金属振動板へ接着し、圧電発音体を得た。そして、 この圧電発音体の圧電特性を実施例１と同様にして測定したところ、共振点及び 反共振点が測定されない不良品が３５％も存在した。[0017] Comparative example 1 On the other hand, as a comparative example, extrusion molding or A raw sheet was prepared by doctor blade molding, and a piezoelectric element was formed under the same conditions as in Example 1. A piezoelectric sounding body was obtained by bonding this to a metal diaphragm under the same conditions. and, When the piezoelectric characteristics of this piezoelectric sounding body were measured in the same manner as in Example 1, the resonance point and There were 35% of defective products in which the anti-resonance point could not be measured.
【００１８】 このように、本考案の圧電発音体では金属振動板への素子コンダクト性は補償 され、圧電特性不良は殆ど発生しなかったが、比較例の圧電発音体では、不良率 が高く、かつ接着条件の変動に伴い、歩留りは安定しなかった。[0018] In this way, in the piezoelectric sounding element of this invention, the conductivity of the element to the metal diaphragm is compensated. Although almost no defective piezoelectric properties occurred, the defective rate of the piezoelectric sounding element of the comparative example was was high, and the yield was unstable due to fluctuations in bonding conditions.
【００１９】[0019]
本考案は、圧電セラミックス板の表面から粗粒子を突出させて金属振動板側の 電極の表面を凸凹にし、圧電素子の電極と金属振動板が接着剤層を介して常に接 触するようにしたので、接触不良による製品の不良を低減かつ削減することがで きるという効果がある。 This invention makes coarse particles protrude from the surface of the piezoelectric ceramic plate and The surface of the electrode is made uneven so that the electrode of the piezoelectric element and the metal diaphragm are always in contact with each other through the adhesive layer. This reduces and reduces product defects due to poor contact. It has the effect of being able to
【００２０】 また、本考案は、不良品を破砕することにより粗粒子を得ることができるので 、不良品を再利用することができ、従って、製品のコストダウンを図ることがで きるという効果がある[0020] In addition, with this invention, coarse particles can be obtained by crushing defective products. , defective products can be reused, thus reducing product costs. It has the effect of reducing
【図１】この考案に係る圧電発音体の断面図である。FIG. 1 is a sectional view of a piezoelectric sounding body according to the invention.
【図２】図１の要部拡大図である。FIG. 2 is an enlarged view of the main part of FIG. 1;
【図３】従来の圧電発音体の断面図である。FIG. 3 is a cross-sectional view of a conventional piezoelectric sounding body.
【図４】図３の要部拡大図である。FIG. 4 is an enlarged view of the main part of FIG. 3;
１ 金属振動板 ２ 圧電素子 ３ 圧電セラミックス板 ４ 電極 ５ 接着剤層 ６ リード ７ 粗粒子 1 Metal diaphragm 2 Piezoelectric element 3 Piezoelectric ceramic plate 4 electrode 5 Adhesive layer 6 lead 7 Coarse particles
Claims (2)
れた圧電素子とを備え、この圧電素子は、分極した圧電
セラミックス板と、この圧電セラミックス板の表裏面に
被覆形成された一対の電極とからなり、前記圧電セラミ
ックス板の少なくとも前記金属振動板側の表面から粗粒
子が突出していることを特徴とする圧電発音体。Claim 1: A metal diaphragm and a piezoelectric element bonded to the metal diaphragm. 1. A piezoelectric sounding body comprising an electrode, wherein coarse particles protrude from at least a surface of the piezoelectric ceramic plate on the side of the metal diaphragm.
一組成の材料からなることを特徴とする請求項１記載の
圧電発音体。2. The piezoelectric sounding body according to claim 1, wherein the coarse particles are made of a material having the same composition as the material of the piezoelectric ceramic plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991022913U JPH04112300U (en) | 1991-03-15 | 1991-03-15 | piezoelectric sounding body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991022913U JPH04112300U (en) | 1991-03-15 | 1991-03-15 | piezoelectric sounding body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04112300U true JPH04112300U (en) | 1992-09-30 |
Family
ID=31908307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991022913U Withdrawn JPH04112300U (en) | 1991-03-15 | 1991-03-15 | piezoelectric sounding body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04112300U (en) |
-
1991
- 1991-03-15 JP JP1991022913U patent/JPH04112300U/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19950615 |