CN201035979Y - Small volume high sound level piezoelectric audible device - Google Patents
Small volume high sound level piezoelectric audible device Download PDFInfo
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- CN201035979Y CN201035979Y CNU2007201088354U CN200720108835U CN201035979Y CN 201035979 Y CN201035979 Y CN 201035979Y CN U2007201088354 U CNU2007201088354 U CN U2007201088354U CN 200720108835 U CN200720108835 U CN 200720108835U CN 201035979 Y CN201035979 Y CN 201035979Y
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Abstract
The utility model discloses a piezoelectric type squealer with high sound level and small volume, which is used for a matched sounding element of indoor safety alarms, such as a carbon monoxide alarm as well as a smoke alarm. The utility model comprises a casing body with an opening, the top part of the casing body is provided with sounding holes, and a piezoelectric piece is fixed in the casing body. The utility model is characterized in that a printed circuit board for sealing the opening of the casing body is arranged on the casing body, three metal pins are riveted on the printed circuit board, and three poles of an M pole, an F pole as well as a G pole on the piezoelectric piece are respectively and electrically connected with the printed circuit board through three leading wires. The utility model has the advantages that under the condition of guaranteeing the electricity performance index, the outer diameter size is greatly reduced, thereby meeting the requirement of the miniaturization of a novel alarm; the original plastic bottom cover is modified to be a printed board, and simultaneously the three metal pins and the printed board are fixed on the printed board by adopting the riveting technology, thereby simplifying the structure, and reducing the cost; by adopting a new driving circuit, the production cost is reduced under the condition of ensuring the electricity performance index.
Description
Technical field
The utility model relates to the electronics squealer, particularly a kind of piezoelectric type squealer of high sound level small size.
Background technology
Notification number is that 2727901 Chinese invention patent application " piezoelectric buzzer " discloses a kind of piezoelectric buzzer, and it comprises: a piezoelectric diaphragm; One is used to lay described piezoelectric diaphragm, is provided with one and is fixed to the shell of bonnet that described housing is used to seal the described opening of described housing with the housing of an opening and one; With a pair of described bonnet, the electric metal lead wire that is connected to described piezoelectric diaphragm and stretches out of being fixed to from described shell, each described metal lead wire all has one to pass through described bonnet from the outwardly directed lead-in wire extension of described shell, a lead-in wire fixed part and a coupling part.Described lead-in wire fixed part is with respect to described lead-in wire extension, in the inside surface that is located at described bonnet and the end bending of placing along the described inside surface of described bonnet, described coupling part is from the inner face bending of described lead-in wire fixed part, so that sweep is the U type substantially when look in the top, the front end of described coupling part separates with the described inside surface of described bonnet and it is contacted with described piezoelectric diaphragm.Its weak point is, its volume is bigger, and complex structure can not adapt to the needs that new indoor alarm (smog, carbon monoxide, gas leak detector etc.) requires small size.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of high sound level is provided, small size, the simple relatively piezoelectric type squealer of structure.
The utility model solves the problems of the technologies described above the technical scheme that is adopted:
A kind of small size high sound level piezoelectric type squealer, comprise that one has the housing of opening, vocal hole is arranged at the top at described housing, a high-performance piezoelectric patches is fixed in the described housing, it is characterized in that: the circuit printing plate that the described shell nozzle of a sealing is arranged on the described housing, three pieces of metal pins of riveted joint on the described circuit printing plate, the M on the piezoelectric patches, F, three utmost points of G are electrically connected by three lead-in wires and circuit printing plate respectively.
The further technical characterictic of the utility model also comprises:
Described housing is cylindrical, and external diameter is the 28-32 millimeter, highly is the 15-19 millimeter.
Described piezoelectric patches is circular, and diameter is the 25-30 millimeter.
Described driving circuit is by the driving circuit of being made up of triode, resistance, inductance etc., the M utmost point of piezoelectric patches connects a utmost point of inductance in the described driving circuit, the F utmost point of piezoelectric patches connects the base stage of triode by second resistance, the collector of triode connects the extraction pole of inductance, and the emitter of triode connects the G utmost point of piezoelectric patches.
Because the utility model has adopted above-mentioned technical measures, makes it to contrast prior art and has following advantage:
1, guarantees that outside dimension dwindles greatly, has adapted to the requirement of novel alarm miniaturization under the condition of electrical performance indexes;
2, adopting high performance diameter is the piezoelectric patches of φ 27 ± 1mm;
3, adjust on the structure, the bottom that former bottom adopts plastic material to make now changes printed board into, adopts the technology of riveted to fix three pieces of metal pins and printed board in printed board simultaneously, simplifies the structure and has dwindled volume;
4, adopted new driving circuit, made it guaranteeing electrical performance indexes when supporting for indoor alarm.
The utility model electroacoustic can meet the UL required standard, and its electrical performance indexes is as follows:
Sound level 〉=85dB (A)/300cm/9VDC
Oscillation frequency 3.4 ± 0.5kHz
Maximum consumption electric current≤30mA/9VDC
Operating voltage range: 6-14VDC
Operating temperature range :-20-+70 ℃
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the circuit diagram of first kind of driving circuit of the utility model;
Fig. 3 is the circuit diagram of second kind of driving circuit of the utility model;
Fig. 4 is the circuit diagram of the third driving circuit of the utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
With reference to Fig. 1, the utility model has a cylindrical housings 1 that has an opening 6, and housing 1 external diameter is 30.5 millimeters, highly is 16 millimeters.It is that 27 millimeters high Kp (electromechanical transducing coefficient) value auto-excitation type piezoelectric ceramic piece 3 adopts silica gel 2 to be adhesively fixed in the housing 1 that vocal hole 8, one diameters are arranged at the top of housing 1.Opening 6 on the housing 1 is sealed by the silica gel bonding by circuit printing plate 5.Adopt the technology of riveted to fix three pieces of metal pins 7 and circuit printing plate 5 on the circuit printing plate 5.Piezoelectric patches 3 is electrically connected with circuit printing plate 5 by three lead-in wires 4, and lead-in wire 4 and piezoelectric patches 3 adopt the method for attachment of welding.Three pieces of metal pins 7 are as the output terminal of product.
The utility model belongs to the piezoelectric type squealer of auto-excitation type, and should add a driving circuit can be with driving work.With reference to Fig. 2-Fig. 4, R1, R2, R3 are respectively first resistance, second resistance, the 3rd resistance, and Q1 is a triode, and L1 is an inductance, and C is an electric capacity, and M, F, G represent three output pins of squealer.
With reference to Fig. 2, this is a kind of driving circuit of the present utility model.The driving circuit of forming by triode Q1, first resistance R 1, second resistance R 2, inductance L 1, the M utmost point of piezoelectric patches 3 connects a utmost point of inductance L 1 in the driving circuit, the F utmost point of piezoelectric patches 3 connects the base stage of triode Q1 by second resistance R 2, the collector of triode Q1 connects the extraction pole of inductance L 1, and the emitter of triode Q1 connects the G utmost point of piezoelectric patches 3.When impressed DC voltage, the base stage of the M utmost point signal of piezoelectric patches 3 by entering triode Q1 with 2 conductings of second resistance R after the F utmost point of piezoelectric patches by the enlarging function of triode Q1, constitutes the oscillatory circuit of an auto-excitation type, thereby promotes piezoelectric patches 3 sounding.
With reference to Fig. 3, this is an another kind of driving circuit of the present utility model.It is connected in series a capacitor C between the F of piezoelectric patches 3 utmost point and second resistance R 2.When impressed DC voltage, feed back the base stage that enters triode Q1 by capacitor C and 2 conductings of second resistance R again after the F utmost point of the M utmost point signal of piezoelectric patches 3 by piezoelectric patches 3, by the enlarging function of triode Q1, constitute the oscillatory circuit of an auto-excitation type, thereby promote piezoelectric patches 3 sounding.
With reference to Fig. 4, this is another driving circuit of the utility model.Its power down resistance R3 that gets on the basis of Fig. 3.It is connected in series a capacitor C between the F of piezoelectric patches 3 utmost point and second resistance R 2.When impressed DC voltage, feed back the base stage that enters triode Q1 by capacitor C and 2 conductings of second resistance R again after the F utmost point of the M utmost point signal of piezoelectric patches 3 by piezoelectric patches 3, by the enlarging function of triode Q1, constitute the oscillatory circuit of an auto-excitation type, thereby promote piezoelectric patches 3 sounding.
The utility model can be used for the supporting sounding component of indoor security alarms such as carbon monoxide alarm, smoke alarm.
Claims (3)
1. small size high sound level piezoelectric type squealer, comprise that one has the housing (1) of opening (6), at the top of described housing (1) vocal hole (8) is arranged, one piezoelectric patches (3) is fixed in the described housing (1), it is characterized in that: the circuit printing plate (5) that a described shell nozzle of sealing (6) is arranged on the described housing (1), described circuit printing plate (5) is gone up riveted joint three pieces of metal pins (7), and three utmost points of M, the F on the piezoelectric patches (3), G are electrically connected by three lead-in wires (4) and circuit printing plate (5) respectively.
2. small size piezoelectric type squealer according to claim 1 is characterized in that: described housing (1) is for cylindrical, and external diameter is the 28-32 millimeter, highly is the 15-19 millimeter.
3. small size piezoelectric type squealer according to claim 1 and 2 is characterized in that: described piezoelectric patches (3) is for circular, and diameter is the 25-30 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201088354U CN201035979Y (en) | 2007-04-30 | 2007-04-30 | Small volume high sound level piezoelectric audible device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201088354U CN201035979Y (en) | 2007-04-30 | 2007-04-30 | Small volume high sound level piezoelectric audible device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201035979Y true CN201035979Y (en) | 2008-03-12 |
Family
ID=39196868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201088354U Expired - Fee Related CN201035979Y (en) | 2007-04-30 | 2007-04-30 | Small volume high sound level piezoelectric audible device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201035979Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332257A (en) * | 2011-10-26 | 2012-01-25 | 宁波东方电子有限公司 | Piezoelectric squealer |
| CN102761812A (en) * | 2012-08-06 | 2012-10-31 | 东莞思威特电子有限公司 | Piezoelectric squealer structure for improving sound pressure value |
| CN105931395A (en) * | 2016-07-05 | 2016-09-07 | 青岛海信移动通信技术股份有限公司 | Wearable equipment |
-
2007
- 2007-04-30 CN CNU2007201088354U patent/CN201035979Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332257A (en) * | 2011-10-26 | 2012-01-25 | 宁波东方电子有限公司 | Piezoelectric squealer |
| CN102761812A (en) * | 2012-08-06 | 2012-10-31 | 东莞思威特电子有限公司 | Piezoelectric squealer structure for improving sound pressure value |
| CN105931395A (en) * | 2016-07-05 | 2016-09-07 | 青岛海信移动通信技术股份有限公司 | Wearable equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080312 Termination date: 20160430 |