CN109862497A - a microphone - Google Patents
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- CN109862497A CN109862497A CN201711241100.3A CN201711241100A CN109862497A CN 109862497 A CN109862497 A CN 109862497A CN 201711241100 A CN201711241100 A CN 201711241100A CN 109862497 A CN109862497 A CN 109862497A
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- microphone
- vibrating diaphragm
- load
- carbon nanotube
- detection circuit
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Abstract
本发明涉及一种传声器，包括振膜负载和检测电路，所述振膜负载包括振膜基材，以及涂附在所述振膜基材表面的碳纳米管涂层，用于接收外界声频信号后，转换成变化的电信号；检测电路，用于检测所述振膜负载上的电压或电流变化，并且提取所述声频信号。本发明主要采用碳纳米管喷涂的振膜负载元件，使得传声器结构简单、灵敏度高、尺寸范围宽、频率响应宽广，经久耐用、耐候性好等优点。
The invention relates to a microphone, comprising a diaphragm load and a detection circuit. The diaphragm load includes a diaphragm base material and a carbon nanotube coating coated on the surface of the diaphragm base material for receiving external audio signals Then, it is converted into a changed electrical signal; the detection circuit is used to detect the change of the voltage or current on the load of the diaphragm, and extract the audio signal. The invention mainly adopts the carbon nanotube sprayed diaphragm load element, so that the microphone has the advantages of simple structure, high sensitivity, wide size range, wide frequency response, durability, good weather resistance and the like.
Description
Technical field
The present invention relates to electroacoustic techniques field more particularly to a kind of microphones.
Background technique
Microphone is sound-electric conversion equipment, also referred to as " microphone ", " microphone " etc..It is most attached most importance in sound system
A kind of one of electro-acoustic element wanted, its effect are to convert acoustic signals into electric signal, then be sent to sound console or amplifier, finally
It is played back from speaker system.That is, microphone is for picking up sound in the acoustic system, it is entire sound equipment
First link of system, the quality of performance quality, the influence to entire sound system are very big.
There are many type of microphone, can be divided into electrodynamic type, condenser type, electromagnetic type, piezoelectric type, semiconductor-type by transduction principle
Microphone.
The problem of common microphone has at present:
1, sensitivity is low: the sensitivity of microphone refers to the sound of microphone -- the ability of electrotransformation.Common moving-coil passes
For the sensitivity of sound device generally in -60dB or so, higher have-a 50dB, and the highly sensitive microphone of profession can achieve -
40dB or so.
Highly sensitive microphone can pick up bigger sound under identical condition, thus can reduce rear class and put
The burden of big device, is easy to get high signal-to-noise ratio.
2, close effect: the close effect of microphone is its low frequency sensitivity meeting when microphone is in short distance pickup
Apparent to improve, distance is closer, and low frequency output is bigger.The effect of low frequency, this low coverage is stronger.
Close effect destroys the good frequency response of microphone, that is to say, that after this microphone, in original sound field
Low frequency part can abnormal increase.
3, it is limited to bear acoustic pressure: excessive acoustic pressure can make microphone pickup quality bad, and be possible to damage microphone, because
This microphone has the technical indicator of one " maximum can bear acoustic pressure ".
Summary of the invention
In order to overcome the sensitivity of existing microphone is low, be not durable the features such as, the invention proposes a kind of microphones.It should
Microphone applies the excellent physical characteristic jumpy of resistance value caused by the unique miniature deformation of carbon nanotube, cooperation
Current source or voltage source make sound signal be changed into voltage or current signal, thus completion sound-electricity conversion.
To achieve the above object, the present invention provides a kind of microphone, including vibrating diaphragm load and detection circuit, the vibrating diaphragms
Load includes shaking membrane substrate, and is coated on the carbon nanotube coating on the shaking membrane substrate surface, for receiving extraneous audio frequency letter
After number, it is converted into the electric signal of variation；Detection circuit, for detecting voltage or curent change in the vibrating diaphragm load, and
Extract the sound signal.
Preferably, the carbon nanotube coating is coated on one side or the two sides of the shaking membrane substrate.
Preferably, the shaking membrane substrate has gossamery elastic material.
It preferably, further include current source or voltage source.
Preferably, the detection circuit, further includes: amplifier, what the amplifier was used to generate vibrating diaphragm load
Electric signal amplifies.
Microphone proposed by the present invention uses the membrane parts of carbon nanotube spraying, and the unique miniature deformation of carbon nanotube draws
The excellent physical characteristic jumpy of the resistance value risen, structure is simple, reduce close effect, acoustic pressure is born in raising and transaudient
The sensitivity of device, and good weatherability, it is not afraid of vibratory impulse and wet environment；Amplifier in peripheral detection circuit, because directly mentioning
The variable signal of voltage or electric current is taken, amplifying circuit is easy to optimize, is stable and efficient, is conducive to the implementation of technique.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described.It should be evident that drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without creative efforts, it can also be obtained according to these attached drawings others
Attached drawing.
Fig. 1 is a kind of microphone circuit structure chart using current source of the embodiment of the present invention；
Fig. 2 is the microphone circuit structure chart that another kind of the embodiment of the present invention uses current source；
Fig. 3 is a kind of microphone circuit structure chart using voltage source of the embodiment of the present invention；
Fig. 4 is the structure chart of vibrating diaphragm of embodiment of the present invention load.
Specific embodiment
To make the technical solution of the embodiment of the present invention and becoming apparent from for advantage expression, below by drawings and examples,
Technical scheme of the present invention will be described in further detail.
Fig. 1 is a kind of microphone circuit structure chart using current source of the embodiment of the present invention.As shown in Figure 1, the present invention mentions
A kind of microphone is gone out, comprising: power supply, current source, vibrating diaphragm load and detection circuit.
In microphone circuit, positive pole connects one end of current source, the other end connection vibrating diaphragm load of current source
The other end ground connection of one end, power cathode and vibrating diaphragm load, one end of detection circuit are connected between vibrating diaphragm load and current source.
After vibrating diaphragm load-receipt is to extraneous sound signal, resistance changes in vibrating diaphragm load, stablizes electricity since current source provides
Stream, the voltage for causing vibrating diaphragm to load change, the voltage change amplified in detection circuit detection vibrating diaphragm load, and extract institute
State sound signal.
Wherein, in microphone, the voltage of power supply is sometimes unstable, increases a current source in circuit, by mentioning
For stabling current, make microphone not by the voltage influence of power supply.The sensitivity of microphone is improved in this way.
In addition, as shown in Fig. 2, detection circuit further includes an amplifier.The peripheral circuit of carbon nanotube microphone circuit
It can connect an amplifier, since change in electric is smaller in microphone circuit, carried out electric signal with an amplifier
Amplification.Because directly extracting the variable signal of voltage or electric current, amplifying circuit is easy to optimize, is stable and efficient, and peripheral circuit
Simply, cost is reduced.
Specifically, current source can be replaced with voltage source.As shown in figure 3, the invention also provides a kind of microphone, packet
It includes: power supply, voltage source, vibrating diaphragm load, resistance, amplifier and detection circuit.
In microphone circuit, positive pole connects one end of voltage source, the other end connection vibrating diaphragm load of voltage source
One end, the other end of vibrating diaphragm load connect resistance, and the other end ground connection of power cathode and resistance, one end of amplifier is connected to vibration
Between film load and resistance, the other end of one end connection amplifier of detection circuit.When vibrating diaphragm load-receipt to extraneous audio frequency letter
After number, resistance changes in vibrating diaphragm load, and since voltage source provides burning voltage, the electric current for causing vibrating diaphragm to load becomes
Change, amplifier amplifies electric signal, the curent change amplified in detection circuit detection vibrating diaphragm load, and extracts the sound
Frequency signal.
Fig. 4 is the structure chart of vibrating diaphragm of the present invention load.As shown in figure 4, vibrating diaphragm load includes shaking membrane substrate and carbon nanotube
Coating, carbon nanotube coating are coated on the surface of shaking membrane substrate, for extraneous sound signal to be converted into electric signal.
Specifically, carbon nanotube coating has resistance value, the urgency of resistance value caused by the unique miniature deformation of carbon nanotube
The excellent physical characteristic of drastic change, makes sound signal be changed into electric signal, to complete sound-electric conversion.This carbon nanotube
Microphone greatly improves the sensitivity of microphone, and carbon nanotube has good stability, so using carbon nanometer
The microphone good weatherability of pipe is not afraid of vibratory impulse and wet environment.
Wherein, carbon nanotube coating can be coated on one side or the two sides of shaking membrane substrate using spraying or other modes.
Specifically, shaking membrane substrate has gossamery elastic material.The shaking membrane substrate be with gossamery elastic material,
Carbon nanotube coating is coated on the surface of shaking membrane substrate, and when sound wave causes its vibration, shaking membrane substrate is by extraneous vibration
It is dynamic and when being deformed, the resistance value of carbon nanotube coating can regular variation therewith, the current source or voltage source of utilization
The voltage signal or electric current number of available variation.The structure for simplifying vibrational system in this way, is conducive to the implementation of technique.
In present example, each module realizes microphone function by operation as follows.
Power supply, current source, vibrating diaphragm load, amplifier and detection circuit in carbon nanotube microphone circuit, by Fig. 2 connection side
Formula connection, wherein power cathode and the other end of vibrating diaphragm load are grounded respectively.
When microphone works, electric current comes out from positive pole, loads followed by current source and vibrating diaphragm, forms a stabilization
Circuit.When vibrating diaphragm load receives extraneous sound signal, sound wave causes shaking membrane substrate vibration in vibrating diaphragm load, is coated on vibrating diaphragm base
The resistance of carbon nanotube coating changes with vibration on material, since current source provides stable electricity in microphone circuit
Stream, changes so as to cause vibrating diaphragm load voltage.The voltage that sound signal is converted into variation is completed in vibrating diaphragm load at this time
Signal.
Carbon nanotube microphone peripheral circuit connects an amplifier, since voltage signal is smaller in microphone circuit,
By an amplifier, voltage signal is amplified, then be sent to detection circuit, for detecting the voltage in the vibrating diaphragm load
Variation, and extract wherein sound signal.
Microphone proposed by the present invention uses the membrane parts of carbon nanotube spraying, and the unique miniature deformation of carbon nanotube draws
The excellent physical characteristic jumpy of the resistance value risen, structure is simple, reduce close effect, acoustic pressure is born in raising and transaudient
The sensitivity of device, and good weatherability, it is not afraid of vibratory impulse and wet environment；Amplifier in peripheral detection circuit, because directly mentioning
The variable signal of voltage or electric current is taken, amplifying circuit is easy to optimize, is stable and efficient, is conducive to the implementation of technique.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (5)
1. a kind of microphone, which is characterized in that including vibrating diaphragm load and detection circuit, the vibrating diaphragm load includes shaking membrane substrate,
And it is coated on the carbon nanotube coating on the shaking membrane substrate surface, after receiving extraneous sound signal, it is converted into variation
Electric signal；
Detection circuit for detecting voltage or curent change in the vibrating diaphragm load, and extracts the sound signal.
2. microphone according to claim 1, which is characterized in that the carbon nanotube coating is coated on the shaking membrane substrate
One side or two sides.
3. microphone according to claim 1, which is characterized in that the shaking membrane substrate has gossamery elastic material.
4. microphone according to claim 1, which is characterized in that further include: current source or voltage source.
5. microphone according to claim 1, which is characterized in that the detection circuit, further includes: amplifier,
The amplifier is used to amplify the electric signal that vibrating diaphragm load generates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711241100.3A CN109862497B (en) | 2017-11-30 | 2017-11-30 | A microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711241100.3A CN109862497B (en) | 2017-11-30 | 2017-11-30 | A microphone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109862497A true CN109862497A (en) | 2019-06-07 |
| CN109862497B CN109862497B (en) | 2025-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711241100.3A Active CN109862497B (en) | 2017-11-30 | 2017-11-30 | A microphone |
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| CN (1) | CN109862497B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1938941A (en) * | 2004-02-09 | 2007-03-28 | 音频专用集成电路公司 | Digital microphone |
| US20080314149A1 (en) * | 2007-06-25 | 2008-12-25 | Micron Technology, Inc. | Sensor and transducer devices comprising carbon nanotubes, methods of making and using the same |
| CN101344447A (en) * | 2007-07-13 | 2009-01-14 | 清华大学 | microelectromechanical pressure sensor |
| CN104685904A (en) * | 2013-01-08 | 2015-06-03 | 陈冰丽 | Condenser microphone and its impedance converter |
| CN204968090U (en) * | 2015-08-08 | 2016-01-13 | 江西远宏科技有限公司 | A vibrating diaphragm for in midget microphone |
| CN205142521U (en) * | 2015-11-05 | 2016-04-06 | 苏州大学 | Carbon nanotube film sound source system based on clamp circuit |
| US9544672B2 (en) * | 2014-12-15 | 2017-01-10 | Piotr Nawrocki | Condenser microphone |
| US20170013361A1 (en) * | 2015-01-03 | 2017-01-12 | Vorbeck Materials Corp. | Microphone diaphragm |
| CN107231595A (en) * | 2016-03-24 | 2017-10-03 | 中芯国际集成电路制造(上海)有限公司 | A kind of MEMS and preparation method thereof, electronic installation |
| CN207638883U (en) * | 2017-11-30 | 2018-07-20 | 北京七九七华音电子有限责任公司 | A kind of microphone |
-
2017
- 2017-11-30 CN CN201711241100.3A patent/CN109862497B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1938941A (en) * | 2004-02-09 | 2007-03-28 | 音频专用集成电路公司 | Digital microphone |
| US20080314149A1 (en) * | 2007-06-25 | 2008-12-25 | Micron Technology, Inc. | Sensor and transducer devices comprising carbon nanotubes, methods of making and using the same |
| CN101344447A (en) * | 2007-07-13 | 2009-01-14 | 清华大学 | microelectromechanical pressure sensor |
| CN104685904A (en) * | 2013-01-08 | 2015-06-03 | 陈冰丽 | Condenser microphone and its impedance converter |
| US9544672B2 (en) * | 2014-12-15 | 2017-01-10 | Piotr Nawrocki | Condenser microphone |
| US20170013361A1 (en) * | 2015-01-03 | 2017-01-12 | Vorbeck Materials Corp. | Microphone diaphragm |
| CN204968090U (en) * | 2015-08-08 | 2016-01-13 | 江西远宏科技有限公司 | A vibrating diaphragm for in midget microphone |
| CN205142521U (en) * | 2015-11-05 | 2016-04-06 | 苏州大学 | Carbon nanotube film sound source system based on clamp circuit |
| CN107231595A (en) * | 2016-03-24 | 2017-10-03 | 中芯国际集成电路制造(上海)有限公司 | A kind of MEMS and preparation method thereof, electronic installation |
| CN207638883U (en) * | 2017-11-30 | 2018-07-20 | 北京七九七华音电子有限责任公司 | A kind of microphone |
Non-Patent Citations (1)
| Title |
|---|
| 郭芸嘉 等: "《碳粒麦克风性质探究与制作》", 物理教师, 5 October 2014 (2014-10-05) * |
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| Publication number | Publication date |
|---|---|
| CN109862497B (en) | 2025-02-25 |
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