JPH0422400Y2 - - Google Patents
Info
- Publication number
- JPH0422400Y2 JPH0422400Y2 JP19746786U JP19746786U JPH0422400Y2 JP H0422400 Y2 JPH0422400 Y2 JP H0422400Y2 JP 19746786 U JP19746786 U JP 19746786U JP 19746786 U JP19746786 U JP 19746786U JP H0422400 Y2 JPH0422400 Y2 JP H0422400Y2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- plate
- sound pressure
- bimorph
- case
- 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
- 239000000463 material Substances 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 1
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
Description
【考案の詳細な説明】
本考案は、音圧調整可能な圧電ブザーの構造に
関する。[Detailed Description of the Invention] The present invention relates to the structure of a piezoelectric buzzer with adjustable sound pressure.
従来、この種の圧電ブザーは第１図に示す如
く、圧電材料板１を金属板２に貼り付けたユニモ
ルフ状のエレメントをレゾメータを形成するケー
ス３に組み込み、駆動の際には音圧が最大となる
共振周波数のみ、もしくは共振付近の２つの周波
数の電圧によつて、単音もしくは２音で駆動して
いるが、音圧を大きくしたり小さくしたりするこ
とが出来ない欠点がある。 Conventionally, as shown in Fig. 1, this type of piezoelectric buzzer incorporates a unimorph-shaped element in which a piezoelectric material plate 1 is attached to a metal plate 2 into a case 3 forming a resometer, and when driven, the sound pressure is maximized. It is driven by a single tone or two tones using only the resonant frequency or voltages at two frequencies near the resonance, but it has the disadvantage that it is not possible to increase or decrease the sound pressure.
本考案はかかる点に鑑み、圧電材料板２枚を使
用したバイモルフ型エレメントを使用し、夫々の
圧電材料板を異なる周波数の電圧で駆動すること
により、音圧を所定の周波数で大きくしたり小さ
くしたりすることが可能な圧電ブザーを提案する
ことを主たる目的とする。 In view of this, the present invention uses a bimorph element made of two piezoelectric material plates, and by driving each piezoelectric material plate with a voltage of a different frequency, the sound pressure can be increased or decreased at a predetermined frequency. The main purpose is to propose a piezoelectric buzzer that can perform
以下本考案の一実施例について図面を参照しな
がら詳細に説明する。 An embodiment of the present invention will be described in detail below with reference to the drawings.
第２図及び第３図は本考案の一例を示す図であ
る。４，５は両面に電極を有する２枚の圧電材料
板を示し、これが１枚の弾性板６を挟み込むよう
に装着してバイモルフ型圧電エレメントが形成さ
れる。そして第３図に示す如く、レゾネータを形
成するケース３に組み込み、夫々の圧電材料板
４，５を異なった周波数の電圧V1，V2で駆動す
るよう構成したものである。これにより、音圧を
所定の周波数で大きくしたり小さくしたり出来る
ことになる。 FIGS. 2 and 3 are diagrams showing an example of the present invention. Reference numerals 4 and 5 indicate two piezoelectric material plates having electrodes on both sides, which are attached to sandwich one elastic plate 6 to form a bimorph piezoelectric element. As shown in FIG. 3, it is assembled into a case 3 forming a resonator, and the piezoelectric material plates 4 and 5 are driven by voltages V 1 and V 2 of different frequencies. This allows the sound pressure to be increased or decreased at a predetermined frequency.
すなわち第４図に示す如く、バイモルフ型圧電
エレメント７の一方の圧電材料板４の共振周波数
の電圧V1を、他方の圧電板５には例えば１０〜
５０Hz程度の周波数の電圧V2を印加すると、圧
電板４は共振周波で振動しようとするが、圧電板
５が10〜50Hzで振動するため、バイモルフ型圧電
エレメント７としての共振周波数は、それに応じ
て可変して音圧が変化することとなる。これをグ
ラフに表わしたものを第４図に示す。 That is, as shown in FIG. 4, the voltage V 1 at the resonant frequency of one piezoelectric material plate 4 of the bimorph type piezoelectric element 7 is applied to the other piezoelectric plate 5, for example, 10 to 10.
When a voltage V 2 with a frequency of about 50 Hz is applied, the piezoelectric plate 4 tries to vibrate at a resonant frequency, but since the piezoelectric plate 5 vibrates at a frequency of 10 to 50 Hz, the resonant frequency of the bimorph piezoelectric element 7 changes accordingly. As a result, the sound pressure changes. A graph representing this is shown in FIG.
以上述べたごとく本考案によれば、両面に電極
を有する圧電板２枚を弾性板を挟み込むように接
着したバイモルフ型圧電エレメントをケースに組
み込み、夫々の圧電板に異なる周波数の電圧を印
加したので、
音圧が可変し得る圧電ブザーの提供が可能とな
る。 As described above, according to the present invention, a bimorph piezoelectric element made by bonding two piezoelectric plates having electrodes on both sides with an elastic plate sandwiched between them is built into the case, and voltages of different frequencies are applied to each piezoelectric plate. , it becomes possible to provide a piezoelectric buzzer whose sound pressure can be varied.
第１図は従来の構成を示す断面図、第２図及び
第３図は本考案の一実施例を示す図、第４図は駆
動電圧波形図である。
３……ケース、４，５……圧電板，６……弾性
板、７……バイモルフ型圧電エレメント。
FIG. 1 is a sectional view showing a conventional configuration, FIGS. 2 and 3 are views showing an embodiment of the present invention, and FIG. 4 is a drive voltage waveform diagram. 3... Case, 4, 5... Piezoelectric plate, 6... Elastic plate, 7... Bimorph type piezoelectric element.
Claims (1)
込むように接着したバイモルフ型圧電エレメント
をケースに組み込み、夫々の圧電板に異なる周波
数の電圧を印加したことを特徴とする圧電ブザ
ー。 A piezoelectric buzzer characterized in that a bimorph type piezoelectric element made by bonding two piezoelectric plates having electrodes on both sides with an elastic plate sandwiched therein is built into a case, and voltages of different frequencies are applied to each piezoelectric plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19746786U JPH0422400Y2 (en) | 1986-12-24 | 1986-12-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19746786U JPH0422400Y2 (en) | 1986-12-24 | 1986-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63102399U JPS63102399U (en) | 1988-07-04 |
| JPH0422400Y2 true JPH0422400Y2 (en) | 1992-05-21 |
Family
ID=31157233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19746786U Expired JPH0422400Y2 (en) | 1986-12-24 | 1986-12-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0422400Y2 (en) |
-
1986
- 1986-12-24 JP JP19746786U patent/JPH0422400Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63102399U (en) | 1988-07-04 |
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