JPS60213199A - Piezo-electric sound producing body - Google Patents
Piezo-electric sound producing bodyInfo
- Publication number
- JPS60213199A JPS60213199A JP6930684A JP6930684A JPS60213199A JP S60213199 A JPS60213199 A JP S60213199A JP 6930684 A JP6930684 A JP 6930684A JP 6930684 A JP6930684 A JP 6930684A JP S60213199 A JPS60213199 A JP S60213199A
- Authority
- JP
- Japan
- Prior art keywords
- case
- sound emitting
- emitting hole
- piezo
- resonance frequency
- 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
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
- G10K11/04—Acoustic filters ; Acoustic resonators
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は薄い金属板に圧電素子を貼り合せた圧電振動子
を使用し、電子回路と組合せて、警報器や各種警報用発
音用等に使用される圧電発音体に関するものである。[Detailed Description of the Invention] Industrial Field of Application The present invention uses a piezoelectric vibrator in which a piezoelectric element is bonded to a thin metal plate, and is used in combination with an electronic circuit to generate alarms and various alarm sounds. The present invention relates to a piezoelectric sounding body.
従来例の構成とその問題点
従来のこの種の圧電発音体は第１図及び第２図に示すよ
うに構成されている。すなわち、薄い金属板１に圧電素
子２を接着剤で貼り合せた構造の圧電振動子３の周辺を
接着剤によってケース４に固定している。４及び６は圧
電振動子３を外部と電気的接続するための端子である。Structure of the conventional example and its problems A conventional piezoelectric sounding body of this type is structured as shown in FIGS. 1 and 2. That is, the periphery of a piezoelectric vibrator 3 having a structure in which a piezoelectric element 2 is bonded to a thin metal plate 1 with an adhesive is fixed to a case 4 with an adhesive. 4 and 6 are terminals for electrically connecting the piezoelectric vibrator 3 to the outside.
そして、圧電振動子３の振動により発生した音を効率よ
く出すために、ケース３には放音孔７と空間８で構成し
た共鳴箱が配しである。In order to efficiently emit the sound generated by the vibration of the piezoelectric vibrator 3, the case 3 is provided with a resonance box composed of a sound emitting hole 7 and a space 8.
さて、上述した従来の構成の圧電発音体にはつぎのよう
な欠点がある。Now, the piezoelectric sounding body having the conventional structure described above has the following drawbacks.
すなわち、圧電発音体から２ ＫＨｔ以下の低い周波数
を取り出すために、上記共鳴箱の共鳴周波数を２ ＫＨ
ｚ以下の低い周波数に合わそうとすると、空間７の容積
を大きくするか、放音孔６を小さくするか、または放音
孔６を長くするか等が一般に知られている。しかし、上
記改造を施すと圧電発音体の外形寸法が大きくなり、こ
の圧電発音体を組込むべき機器に入らなくなるという欠
点を有していた。That is, in order to extract low frequencies of 2 KHt or less from the piezoelectric sounding body, the resonance frequency of the resonance box is set to 2 KHt.
In order to tune to a low frequency below z, it is generally known that the volume of the space 7 should be increased, the sound emission hole 6 should be made smaller, or the sound emission hole 6 should be made longer. However, when the above-mentioned modification is carried out, the external dimensions of the piezoelectric sounding body become large, which has the drawback that it cannot fit into the equipment into which the piezoelectric sounding body is to be incorporated.
発明の目的
本発明はこのような従来の欠点を除去するもので、圧電
発音体の外形寸法を変えずに２ ＫＨｚ以下の低い周波
数に共鳴箱の共鳴周波数を合せた圧電発音体を提供しよ
うとするものである。OBJECTS OF THE INVENTION The present invention aims to eliminate such conventional drawbacks and to provide a piezoelectric sounding body in which the resonant frequency of the resonance box is adjusted to a low frequency of 2 KHz or less without changing the external dimensions of the piezoelectric sounding body. It is something to do.
発明の構成
この目的を達成するために本発明の圧電発音体は、ケー
スに形成された放音孔の筒部をケース内側に設け、放音
孔の長さを長くし、放音孔を含む共鳴箱の共鳴周波数を
下げだものである。この放音孔の筒部はケース内側に設
けられるため、外形寸法を変えることなく共鳴箱の共鳴
周波数を下げることができ、同じ大きさであればより低
い共鳴周波数を、そして同じ共鳴周波数であればより小
形にした圧電発音体を得ることとなる。Structure of the Invention In order to achieve this object, the piezoelectric sounding body of the present invention has a cylindrical portion of the sound emission hole formed in the case, is provided inside the case, the length of the sound emission hole is increased, and the sound emission hole is included. This lowers the resonance frequency of the resonance box. Since the cylindrical part of this sound emitting hole is provided inside the case, it is possible to lower the resonance frequency of the resonance box without changing the external dimensions. In this case, a piezoelectric sounding body made smaller can be obtained.
実施例の説明 以下、本発明の一実施例を第３図を用いて説明する。Description of examples An embodiment of the present invention will be described below with reference to FIG.
まず薄い金属板９に圧電素子１０を接着剤で貼り合せた
構造の圧電振動子１１０周辺を接着剤によってケース１
２に固定している。そして、上記ケース１２の放音孔１
３にはそのケース１２の内側に筒部１４が設けられてお
り、放音孔１３の長さが長くなっており、放音孔１３と
空間１６で構成される共鳴箱の共鳴周波数を下げている
。１６及び１７は上記圧電振動子１１を外部と電気的接
続するだめの端子である。First, the periphery of the piezoelectric vibrator 110, which has a structure in which a piezoelectric element 10 is bonded to a thin metal plate 9 with adhesive, is attached to the case 1.
It is fixed at 2. Then, the sound emission hole 1 of the case 12 is
3 is provided with a cylindrical portion 14 inside its case 12, and the length of the sound emitting hole 13 is increased, lowering the resonance frequency of the resonance box composed of the sound emitting hole 13 and the space 16. There is. 16 and 17 are terminals for electrically connecting the piezoelectric vibrator 11 to the outside.
このように構成することにより、外形寸法を変えずに共
鳴箱の共鳴周波数を下げることができる。With this configuration, the resonance frequency of the resonance box can be lowered without changing the external dimensions.
発明の効果
以上のように本発明の圧電発音体によれば、同じ外形寸
法であればより低い共鳴周波数の、そして同じ共鳴周波
数であればより小形にした圧電発音体を提供することが
できるものである。Effects of the Invention As described above, according to the piezoelectric sounding body of the present invention, it is possible to provide a piezoelectric sounding body that has a lower resonance frequency if the external dimensions are the same, and is smaller if the resonance frequency is the same. It is.
第１図は従来の圧電発音体を示す断面図、第２図は同底
面図、第３図は本発明に係る圧電発音体の一実施例を示
す断面図である、
９・・ −薄い金属板、１０・・・・圧電素子、１１・
・・圧電振動子、１２・・・ ケース、１３・・−放電
孔、１４ 筒部。9. - Thin metal Plate, 10...Piezoelectric element, 11.
...Piezoelectric vibrator, 12... Case, 13...-Discharge hole, 14 Cylindrical portion.
Claims (1)
定するケースに形成された放音孔の筒部をケース内側に
設けた圧電発音体。A piezoelectric sounding body that supports and fixes a piezoelectric vibrator, which is made by bonding a piezoelectric element to a thin metal plate, in a case that has a cylindrical part with a sound emitting hole inside the case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6930684A JPS60213199A (en) | 1984-04-06 | 1984-04-06 | Piezo-electric sound producing body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6930684A JPS60213199A (en) | 1984-04-06 | 1984-04-06 | Piezo-electric sound producing body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60213199A true JPS60213199A (en) | 1985-10-25 |
Family
ID=13398739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6930684A Pending JPS60213199A (en) | 1984-04-06 | 1984-04-06 | Piezo-electric sound producing body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60213199A (en) |
-
1984
- 1984-04-06 JP JP6930684A patent/JPS60213199A/en active Pending
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