CN201611949U - Acoustic sensor with noise reducing function - Google Patents
Acoustic sensor with noise reducing function Download PDFInfo
- Publication number
- CN201611949U CN201611949U CN2010201207783U CN201020120778U CN201611949U CN 201611949 U CN201611949 U CN 201611949U CN 2010201207783 U CN2010201207783 U CN 2010201207783U CN 201020120778 U CN201020120778 U CN 201020120778U CN 201611949 U CN201611949 U CN 201611949U
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- China
- Prior art keywords
- acoustic sensor
- electret
- circuit board
- noise reduction
- reduction function
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- 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.)
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Abstract
The utility model discloses an acoustic sensor with noise reducing function, belonging to the technical field of acoustic sensor, and comprising a casing, which is provided with a sound hole for receiving outside sounds; a circuit board, which is jointed with an opening end of the casing and provided with a field effect transistor; an electret, which is accommodated inside the casing and electrically connected with the field effect transistor; a vibrating member, which is connected with the circuit board via the casing, keeps interval in relation to the electret and vibrates owing to sound pressure input from the sound hole; and an insulating ring, which is arranged between the vibrating member and the circuit board and provided with a leakage port for the leakage of low frequency noise. According to the utility model, the leakage port, which is arranged at the end part, adjacent to the circuit board, of the insulating ring, is used for the leakage of low frequency noise, so the noise reducing function of the acoustic sensor is not spatially limited and not influenced accordingly, and compared with the structure in prior art, the acoustic sensor is more suitable for thin electronic products and is industrially usable.
Description
Technical field
The utility model belongs to the acoustic sensor technical field, particularly relates to a kind of low frequency that utilizes and leaks, and then reach the acoustic sensor with noise reduction function.
Background technology
Flourish along with the 3C electronic product, acoustic sensor requires relatively more and more higher for the conversion performance of sound, particularly when using every electronic product, for the influence of environmental noise, haggle over every penny especially; According to ASSOCIATE STATISTICS, noise is generally low frequency, its source has: fan or ventilation equipment, compressor, the vehicles etc., therefore, in order to overcome the problem of noise, existing acoustic sensor 100 designs shown in first figure usually, it comprises columnar shell 1, shell 1 has a sound hole 1a, one circuit board 2 is set in the open end of shell 1, which is provided with a signal amplifying apparatus 2a and a back sound hole 2b, and in shell 1 inwall and be adjacent to sound hole 1a and be sequentially provided with a retainer ring 3, one vibrating membrane 4, one insulating washer 5, one pole plate 6, one wire netting 7 an and dead ring 8 that is located between circuit board 2 and the wire netting 7 is set, dead ring 8 is as preventing shell 1 and pole plate 6, electric connection between the wire netting 7, synchronous signal amplifying device 2a goes up and is connected in wire netting 7 by an electrical connector 2c.Wherein, acoustic sensor 100 can pick up sound to shell 1 inside from sound hole 1a and back sound hole 2b, and act on respectively on the vibrating membrane 4, when this neither equidirectional sound acts on vibrating membrane 4, sound wave can be cancelled out each other, be able to the low frequency noise of environment is eliminated, pick up single voice signal that points to effectively, use the distance change that makes between vibrating membrane 4 and the pole plate 6 and cause capacitance to change, and with electrical signal transfer to circuit board 2, via the amplification of signal amplifying apparatus 2a, has the signal of telecommunication of noise reduction characteristics with output.
Yet, the following sound hole 2b of acoustic sensor 100 is arranged on circuit board 2, just be positioned at the bottom position of acoustic sensor 100, thus, when acoustic sensor 100 is arranged on narrow space, block or hinder the pickup effect of back sound hole 2b easily, particularly at present electronic product all with the guiding that is designed to of slimming, therefore, existing acoustic sensor 100 may be because of the locus of configuration, and has weakened the effect of noise abatement, causes output quality not good, make the characteristic of acoustic sensor 100 directive property also influenced, so and be unfavorable for extensive utilization on the industry.
The utility model content
The purpose of this utility model is to provide a kind of acoustic sensor with noise reduction function, and it utilizes dead ring that leakage hole is set, and leaking as low frequency noise, and then reaches the acoustic sensor with de-noising function, solves the defective that prior art exists.
For achieving the above object, the utility model adopts following technical scheme:
A kind of acoustic sensor with noise reduction function comprises:
One shell, described shell have a sound hole and receive external sound;
One circuit board is incorporated into the openend of this shell, and this circuit board is provided with a field-effect transistor;
One electret spare is placed in this shell, and electrically connects with this field-effect transistor;
One vibration component is to electrically connect this circuit board via shell, and keeps a spacing with this electret spare, and this vibration component is subjected to sound hole input sound press and vibrates; And
One dead ring is arranged between this vibration component and this circuit board, and this dead ring is provided with a leakage hole, is used for leaking low frequency noise.
Preferred scheme is: described leakage hole is rectangular-shaped.
More excellent scheme is: described leakage hole is arranged between dead ring diapire and the sidewall.
More excellent scheme is: described leakage hole three side sealing closes a diapire that faces dead ring and opens.
More excellent scheme is: electrically connect by a conducting piece between described field-effect transistor and this electret spare.
More excellent scheme is: it is corresponding with this vibration component that described electret spare has electret zone, and this electret zone is provided with several pores.
More excellent scheme is: described vibration component comprises the retainer ring of a vibrating membrane and a metal material.
More excellent scheme is: be provided with a packing ring between described dead ring and this vibration component, to constitute the spacing between this electret spare and this vibration component.
The utility model compared with prior art has following advantage and beneficial effect:
Acoustic sensor with noise reduction function described in the utility model, the end that utilizes dead ring to be adjacent to circuit board is provided with leakage hole, leakage as low frequency noise, so make noise reduction function of the present utility model can not be subjected to the limitation in space and influence its performance, and compared to prior art constructions, more can be applicable to slim electronic product, have the value on the industry.
Description of drawings
Fig. 1 is the profile of existing acoustic sensor;
Fig. 2 is the exploded view with acoustic sensor of noise reduction function described in the utility model;
Fig. 3 is the profile with acoustic sensor of noise reduction function described in the utility model.
Among the figure:
100 acoustic sensors, 1 shell
1a sound hole 2 circuit boards
Sound hole behind the 2a signal amplifying apparatus 2b
2c electrical connector 3 retainer rings
4 vibrating membranes, 5 insulating washers
6 pole plates, 7 wire nettings
8 dead rings
200 acoustic sensors, 10 shells
11 sound holes, 12 adhesive-bonded fabrics
20 circuit boards, 21 field-effect transistors
22 conducting pieces, 30 vibration components
31 vibrating membranes, 32 retainer rings
40 packing rings, 50 electret spares
51 electrets zone, 52 pores
60 dead rings, 61 leakage holes
Embodiment
Below in conjunction with the drawings and specific embodiments the acoustic sensor with noise reduction function described in the utility model is described in further detail.
As shown in Figures 2 and 3, the acoustic sensor 200 with noise reduction function includes a shell 10, a circuit board 20, a vibration component 30, a packing ring 40, an electret spare 50 and a dead ring 60.
One end of shell 10 is the open end, and the other end then has a sound hole 11, in order to receiving extraneous source of sound, and in sound hole 11 arranged outside one adhesive-bonded fabric 12, in order to blocking foreign body.
Vibration component 30 comprises the retainer ring 32 that a vibrating membrane 31 and a metal material are made, retainer ring 32 is in order to support and fixing vibrating membrane 31, vibration component 30 is arranged at shell 10 inside, and is adjacent to the sound hole 11 of shell 10, and retainer ring 32 forms with circuit board 20 via shell 10 and electrically connects.
Electret spare 50 is arranged within the shell 10, and having an electret zone 51, electret zone 51 is provided with several pores 52, in order to sound air communication mistake to be provided, between electret spare 50 and the vibration component 30 across packing ring 40, so that electret zone 51 keeps a determining deviation with vibrating membrane 31.Wherein, electret spare 50 electrically connects by a conducting piece 22 and field-effect transistor 21, and conducting piece 22 is embodied as metal hard member or soft the effect that all can reach electrical conduction.
When external sound when the sound hole 11 of shell 10 enters acoustic sensor 200, vibrating membrane 31 is subjected to the start of sound air-flow and produces vibration, make the distance between vibrating membrane 31 and the electret zone 51 produce change, and then cause the variation of capacitance, and corresponding electric signal is handled and converted to the field-effect transistor 21 that the variation of this capacitance is passed to circuit board 20 by conducting piece 22.Owing to enter the sound wave that shell 10 interior sound frequencies have comprised high frequency and low frequency simultaneously, and the wavelength of the wavelength higher-frequency of low frequency is long, make in the fixing inner space of Electret Condencer Microphone 200, the low frequency higher-frequency has propagation velocity fast, therefore, when sound enters acoustic sensor 200, the sound wave of low frequency can be apace by behind the vibrating diaphragm 31, discharge from the leakage hole 61 of dead ring 60 apace then, and leak in the slight void between shell 10 and the dead ring 60, so, can eliminate some low frequency noises to act on the vibrating membrane 31, so that Electret Condencer Microphone 200 has good noise reduction function, provide high-quality pickup effect.
In addition, the acoustic sensor 200 that present embodiment is described to have a noise reduction function need not be offered any pickup hole with as the anti-noise function in circuit board 20, make when acoustic sensor 200 is installed on electronic product, do not have and be subjected to the narrow and small influence in space, hinder the effect of pickup; Moreover, acoustic sensor 200 utilizes inner dead ring 60 to offer leakage hole 61, leakage as low frequency noise, so in small space, also can operate and reach the function of noise abatement normally, meet the designer trends of the electronic product microminiaturization on the present industry fully, have the value on the industry.
The above only is an illustrative, but not is restricted person.Anyly do not break away from the utility model spirit and category, and, all should be contained in the protection range of this patent its equivalent modifications of carrying out or change.
Claims (8)
1. acoustic sensor with noise reduction function is characterized in that: comprising:
One shell, described shell have a sound hole and receive external sound;
One circuit board is incorporated into the openend of this shell, and this circuit board is provided with a field-effect transistor;
One electret spare is placed in this shell, and electrically connects with this field-effect transistor;
One vibration component is to electrically connect this circuit board via shell, and keeps a spacing with this electret spare, and this vibration component is subjected to sound hole input sound press and vibrates; And
One dead ring is arranged between this vibration component and this circuit board, and this dead ring is provided with leakage hole leakage low frequency noise.
2. the acoustic sensor with noise reduction function as claimed in claim 1 is characterized in that: described leakage hole is rectangular-shaped.
3. as claim 1 or 2 described acoustic sensors with noise reduction function, it is characterized in that: described leakage hole is arranged between dead ring diapire and the sidewall.
4. the acoustic sensor with noise reduction function as claimed in claim 3 is characterized in that: described leakage hole three side sealing closes a diapire that faces dead ring and opens.
5. the acoustic sensor with noise reduction function as claimed in claim 1 is characterized in that: electrically connect by a conducting piece between described field-effect transistor and this electret spare.
6. the acoustic sensor with noise reduction function as claimed in claim 1 is characterized in that: it is corresponding with this vibration component that described electret spare has electret zone, and this electret zone is provided with several pores.
7. the acoustic sensor with noise reduction function as claimed in claim 1 is characterized in that: described vibration component comprises the retainer ring of a vibrating membrane and a metal material.
8. the acoustic sensor with noise reduction function as claimed in claim 1 is characterized in that: be provided with a packing ring between described dead ring and this vibration component, to constitute the spacing between this electret spare and this vibration component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201207783U CN201611949U (en) | 2010-02-05 | 2010-02-05 | Acoustic sensor with noise reducing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201207783U CN201611949U (en) | 2010-02-05 | 2010-02-05 | Acoustic sensor with noise reducing function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201611949U true CN201611949U (en) | 2010-10-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201207783U Expired - Fee Related CN201611949U (en) | 2010-02-05 | 2010-02-05 | Acoustic sensor with noise reducing function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201611949U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506998A (en) * | 2014-11-29 | 2015-04-08 | 惠州市天音乐器有限公司 | Pickup for saxophone |
| CN106162476A (en) * | 2015-04-20 | 2016-11-23 | 钰太芯微电子科技（上海）有限公司 | The mike monomer of anti-low frequency noise |
| CN107238430A (en) * | 2017-05-27 | 2017-10-10 | 天府认证有限公司 | Can noise reduction piezoelectric vibration pickup |
| CN109646042A (en) * | 2019-01-29 | 2019-04-19 | 电子科技大学 | A kind of wearable heart sound and lungs sound monitoring device based on piezoelectric transducer |
-
2010
- 2010-02-05 CN CN2010201207783U patent/CN201611949U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506998A (en) * | 2014-11-29 | 2015-04-08 | 惠州市天音乐器有限公司 | Pickup for saxophone |
| CN104506998B (en) * | 2014-11-29 | 2018-03-16 | 惠州市天音乐器有限公司 | A kind of sound pick-up for saxophone |
| CN106162476A (en) * | 2015-04-20 | 2016-11-23 | 钰太芯微电子科技（上海）有限公司 | The mike monomer of anti-low frequency noise |
| CN106162476B (en) * | 2015-04-20 | 2023-10-27 | 钰太芯微电子科技（上海）有限公司 | Microphone unit for resisting low-frequency noise |
| CN107238430A (en) * | 2017-05-27 | 2017-10-10 | 天府认证有限公司 | Can noise reduction piezoelectric vibration pickup |
| CN109646042A (en) * | 2019-01-29 | 2019-04-19 | 电子科技大学 | A kind of wearable heart sound and lungs sound monitoring device based on piezoelectric transducer |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101020 Termination date: 20170205 |