CN102761812A - Piezoelectric squealer structure for improving sound pressure value - Google Patents
Piezoelectric squealer structure for improving sound pressure value Download PDFInfo
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- CN102761812A CN102761812A CN2012102768168A CN201210276816A CN102761812A CN 102761812 A CN102761812 A CN 102761812A CN 2012102768168 A CN2012102768168 A CN 2012102768168A CN 201210276816 A CN201210276816 A CN 201210276816A CN 102761812 A CN102761812 A CN 102761812A
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- squealer
- sound pressure
- back cover
- bonnet
- pressure value
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Abstract
The invention provides a piezoelectric squealer structure for improving sound pressure value. The piezoelectric squealer structure for improving sound pressure value comprises a casing, a back cover and a vibration sheet, wherein the back cover is sealed at the back of the casing to form a resonant chamber, two sound release holes which are symmetrical relative to the center of the back cover are arranged on the back cover, the resonant frequency of the resonant chamber is 4KHz, and the diameter of each of the two sound release holes is 0.6mm. After a squealer is connected with alternating-current electric signals and when the vibration sheet vibrates to compress air, the air can be discharged through the two small holes on the back cover, the vibration sheet is not resisted by air compressing, accordingly the vibration sheet vibrates freely and releases sound completely, and sound pressure value of products can be greatly improved verified by tests. Simultaneously, the number of clamping buckles of the casing is reduced from four to one so that the phenomenon that the products after lead-free wave crest welding fall off can be avoided.
Description
Technical field
The invention belongs to the acoustic structure field, be specifically related to a kind of squealer of high sound pressure value.
Background technology
Squealer is divided into two kinds of piezoelectric type and electromagnetic types by the sounding principle, and the piezoelectric type squealer is to utilize piezoelectric ceramic piece to be pasted on the vibrating reed, and when driving piezoelectric ceramic piece, piezoelectric ceramic piece drives the sheet metal vibration because produce mechanical deformation; Electromagnetic audible device is to utilize oscillator to produce audio signal to drive solenoid and produce magnetic field, in the cooperation during magnet, at the next drive vibrating reed of the interaction of magnet and solenoid sounding.The piezoelectric type squealer is because power consumption is less, and volume is little and sound is more melodious, is more suitable on various multimedias or automobile equipment; Yet in order to ensure beautiful appearance, its product of processing all has the restriction of a profile and size; And exist two fatal defectives with the piezoelectricity squealer that prior art is processed: the one, because spatial constraints; Squealer is subject to the regulation of its size dimension or shape, thereby under the situation of identical shell sizes and piezo parameter, its resonance effect is not good; The sound pressure level of product thereby lower does not find practical method yet on the approach that promotes sound pressure level; The 2nd, be assembled on the pcb board after through the welding of unleaded crest, the squealer cover plate is easy to come off.
Summary of the invention
The technical problem that the present invention will solve provides a kind of in the squealer structure that is not changing raising sound pressure level under the squealer volume prerequisite.
A kind of piezoelectricity squealer structure that improves sound pressure level of the present invention; Comprise shell, bonnet and vibrating reed; Described bonnet is closed in the rear of shell, constitutes the sympathetic response chamber, lets out sound hole for centrosymmetric two that are covered with after the frequency of sympathetic response chamber is described about bonnet.
Described sympathetic response chamber resonance frequency is 4KHz, and two corresponding described opening diameters of letting out sound hole are 0.6mm.
Said shell is provided with a buckle slot at the edge that contacts with bonnet, described bonnet is provided with a buckle with engaging at correspondence position.
The invention has the beneficial effects as follows: after squealer is connected ac signal; Vibrating reed produces vibration and during compressed air; Air can be discharged through two apertures of bonnet; Make vibrating reed not receive the resistance of air compression, thus free vibration and sound discharged fully, and it can improve the sound pressure level of product greatly through test.Simultaneously, four buckle slots of shell are reduced to one, can solve the phenomenon that product occurs coming off after through unleaded crest welding and take place.
Description of drawings
Fig. 1 is a sectional structure chart of the present invention.
Fig. 2 is the structure chart of bonnet band perforate.
Fig. 3 is not for opening two resonance frequency and sound pressure variations curve charts of letting out sound hole.
Fig. 4 is out that two are let out resonance frequency and the sound pressure variations curve chart that the sound hole diameter is 0.6mm.
Embodiment
A kind of piezoelectricity squealer structure that improves sound pressure level of the present invention; With reference to Fig. 1; It comprises shell 1, bonnet 2 and vibrating reed 3; Described bonnet is closed in the rear of shell; Constitute the sympathetic response chamber, the frequency computation part formula of sympathetic response chamber is following:
Wherein, Fo: the resonance frequency of chamber (Hz); C: the velocity of sound=344000 (mm/sec); V: sympathetic response cavity volume (mm3);
D: sound radiation bore dia (mm); L: sound radiation hole height (mm).
Following formula is last of the twelve Earthly Branches nurse hertz formula, but its sealing of the time not considering rear chamber in design whether, promptly can play the output acoustic pressure of product on resonant frequency point under the actual conditions and weaken.And improvements of the present invention are, let out sound hole 4 (like Fig. 1 and Fig. 2) for centrosymmetric two that on described bonnet, are provided with about bonnet.
With reference to table 1, the correction data of acoustic pressure that it has listed not perforate of bonnet when resonance frequency is 4KHz, open 1.2mm when letting out sound hole and 0.6mm and letting out sound hole:
The present invention is primarily aimed in the research of resonance frequency during at 4KHz, thereby in the present embodiment, described sympathetic response chamber resonance frequency is set to 4KHz; Can draw by last table data; Two corresponding described opening diameters of letting out sound hole are preferably 0.6mm, and its sound pressure level will have a raising by a relatively large margin, and through evidence; The opening diameter of letting out sound hole between 0.5mm-1.0mm, sound pressure level all also tool be improved to some extent.
Said shell is provided with a buckle slot at the edge that contacts with bonnet, described bonnet is provided with a buckle in order to engaging at correspondence position.
Institute of the present invention improvements are that buckle and notch are reduced to and use one, through the tensile test of squealer; The present invention has made a contrast: along with the temperature raising of pb-free solder; The squealer shell buckle strength of four buckle notches on the contrary a little less than, through crest welding thermal shock, the STRESS VARIATION that material can occur expanding with heat and contract with cold; When the elastic force that receives spring needle promoted, the phenomenon that bonnet comes off appearred.
And four buckle slots of shell are reduced to one; Can see through table 2, when pulling force can significantly increase, its also big leap ahead of time that comes off; Reach purpose, solve the phenomenon that occurs coming off bad after product welds through crest and take place bonnet and the reliable assembling of shell.Following table 2 illustrates crest welding back pull and sustainable time:
The above is not that technical scope of the present invention is done any restriction, all according to technical spirit of the present invention to above any modification, equivalent variations and modification that embodiment did, all still belong in the scope of technical scheme of the present invention.
Claims (3)
1. a piezoelectricity squealer structure that improves sound pressure level comprises shell, bonnet and vibrating reed, and described bonnet is closed in the rear of shell, constitutes the sympathetic response chamber, it is characterized in that: let out sound hole for centrosymmetric two that are covered with after described about bonnet.
2. a kind of piezoelectricity squealer structure that improves sound pressure level according to claim 1, it is characterized in that: described sympathetic response chamber resonance frequency is 4KHz, two corresponding described opening diameters of letting out sound hole are 0.6mm.
3. a kind of piezoelectricity squealer structure that improves sound pressure level according to claim 1, it is characterized in that: said shell is provided with a buckle slot at the edge that contacts with bonnet, and described bonnet is provided with a buckle with engaging at correspondence position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102768168A CN102761812A (en) | 2012-08-06 | 2012-08-06 | Piezoelectric squealer structure for improving sound pressure value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102768168A CN102761812A (en) | 2012-08-06 | 2012-08-06 | Piezoelectric squealer structure for improving sound pressure value |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102761812A true CN102761812A (en) | 2012-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102768168A Pending CN102761812A (en) | 2012-08-06 | 2012-08-06 | Piezoelectric squealer structure for improving sound pressure value |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365428A (en) * | 2018-10-11 | 2019-02-22 | 九江精密测试技术研究所 | A kind of Gas Vibration cleaning device |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1169489A (en) * | 1997-08-20 | 1999-03-09 | Matsushita Electric Ind Co Ltd | Piezoelectric reception unit |
| JP2000023287A (en) * | 1999-02-03 | 2000-01-21 | Hokuriku Electric Ind Co Ltd | Surface mounting piezoelectric sound generator |
| JP2006211412A (en) * | 2005-01-28 | 2006-08-10 | Tdk Corp | Piezoelectric sounder and electric apparatus using piezoelectric sounder |
| CN201035979Y (en) * | 2007-04-30 | 2008-03-12 | 宁波东方电子有限公司 | Small volume high sound level piezoelectric audible device |
| CN201477872U (en) * | 2009-08-17 | 2010-05-19 | 李飞 | buzzer |
| CN201718041U (en) * | 2010-06-21 | 2011-01-19 | 瑞声光电科技(常州)有限公司 | Acoustic generator |
| CN201750543U (en) * | 2010-07-09 | 2011-02-16 | 瑞声光电科技(常州)有限公司 | Sound generator |
| CN202120602U (en) * | 2011-07-07 | 2012-01-18 | 杨政委 | Piezoelectric type squealer |
| CN202307116U (en) * | 2011-10-26 | 2012-07-04 | 宁波东方电子有限公司 | Piezoelectric sounder |
| CN202818594U (en) * | 2012-08-06 | 2013-03-20 | 东莞思威特电子有限公司 | Piezoelectric squealer structure for raising sound pressure value |
-
2012
- 2012-08-06 CN CN2012102768168A patent/CN102761812A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1169489A (en) * | 1997-08-20 | 1999-03-09 | Matsushita Electric Ind Co Ltd | Piezoelectric reception unit |
| JP2000023287A (en) * | 1999-02-03 | 2000-01-21 | Hokuriku Electric Ind Co Ltd | Surface mounting piezoelectric sound generator |
| JP2006211412A (en) * | 2005-01-28 | 2006-08-10 | Tdk Corp | Piezoelectric sounder and electric apparatus using piezoelectric sounder |
| CN201035979Y (en) * | 2007-04-30 | 2008-03-12 | 宁波东方电子有限公司 | Small volume high sound level piezoelectric audible device |
| CN201477872U (en) * | 2009-08-17 | 2010-05-19 | 李飞 | buzzer |
| CN201718041U (en) * | 2010-06-21 | 2011-01-19 | 瑞声光电科技(常州)有限公司 | Acoustic generator |
| CN201750543U (en) * | 2010-07-09 | 2011-02-16 | 瑞声光电科技(常州)有限公司 | Sound generator |
| CN202120602U (en) * | 2011-07-07 | 2012-01-18 | 杨政委 | Piezoelectric type squealer |
| CN202307116U (en) * | 2011-10-26 | 2012-07-04 | 宁波东方电子有限公司 | Piezoelectric sounder |
| CN202818594U (en) * | 2012-08-06 | 2013-03-20 | 东莞思威特电子有限公司 | Piezoelectric squealer structure for raising sound pressure value |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365428A (en) * | 2018-10-11 | 2019-02-22 | 九江精密测试技术研究所 | A kind of Gas Vibration cleaning device |
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Application publication date: 20121031 |