CN2689635Y - Capacitor microphones - Google Patents
Capacitor microphones Download PDFInfo
- Publication number
- CN2689635Y CN2689635Y CN 200420045189 CN200420045189U CN2689635Y CN 2689635 Y CN2689635 Y CN 2689635Y CN 200420045189 CN200420045189 CN 200420045189 CN 200420045189 U CN200420045189 U CN 200420045189U CN 2689635 Y CN2689635 Y CN 2689635Y
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- CN
- China
- Prior art keywords
- circuit board
- printed circuit
- noise
- effect transistor
- field effect
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a capacitor microphone, comprising an etched circuit board, a field-effect tube, and a capacitance portion composed of a diaphragm and a rear portion pole board. The rear portion pole board is connected electrically with the grid of the field-effect tube. The printed circuit board is connected with two capacitors which are used for eliminating the noise. The two capacitors integrate on the printed circuit board and are connected between the source electrode of the field-effect tube and the drain electrode of the field-effect tube in parallel. Compared with the prior art, the utility model may eliminate the noise better because the printed circuit board is additionally provided with a double capacitor circuit which is used for filtering.
Description
Technical field
The utility model relates to a kind of condenser microphone, the improvement of printed circuit board arrangement in the specifically this microphone.
Background technology
Condenser microphone is widely used in telephone set, mobile phone, portable microphone, in the voice-control toy etc. as acoustical-electrical transducer, its cardinal principle is that changes in capacitance changes into the signal of telecommunication and amplifies output between the vibrating diaphragm that will be caused by sound wave and the battery lead plate, its general structure such as publication number are CN1299228A disclosed a kind of " condenser microphone ", comprise a shell with sound wave input hole, has a field effect transistor in the shell, one printed circuit board and the capacitive part that constitutes by vibrating diaphragm and rear electrode plate, open with the liner insulation between described vibrating diaphragm and the rear electrode plate, this rear electrode plate has a plurality of through holes, the control gate that the change of the electric capacity that it is caused by described vibrating diaphragm changes into an electrical potential difference and this electrical potential difference is supplied to described field effect transistor; The printed circuit of described printed circuit board (PCB) is electrically connected with each terminals of described field effect transistor.Its weak point is: lack element and circuit in order to filtering on the printed circuit board (PCB), be difficult to abate the noise well.
Summary of the invention
The purpose of this utility model is to overcome the above-mentioned weak point of prior art, and a kind of condenser microphone that can abate the noise preferably is provided.
The purpose of this utility model is achieved through the following technical solutions: design a kind of condenser microphone, comprise printed circuit board (PCB), field effect transistor and the capacitive part that constitutes by vibrating diaphragm and rear electrode plate, the rear electrode plate is electrically connected with the grid of field effect transistor, is connected with the capacitor that is used to abate the noise on the described printed circuit board (PCB).
The described capacitor that is used to abate the noise is connected between the source electrode and drain electrode of field effect transistor.
The described capacitor that is used to abate the noise can be two.
The described capacitor that is used to abate the noise is integrated in printed circuit board (PCB).
Owing on printed circuit board (PCB), set up the dual-capacitor circuit that is used for filtering, therefore compared with prior art can abate the noise better.
Description of drawings
Fig. 1 is the schematic diagram of the printed circuit board (PCB) of first kind of execution mode of the present utility model;
Fig. 2 is the schematic diagram of the printed circuit board (PCB) of second kind of execution mode of the present utility model;
Specific embodiments
The major part of condenser microphone of the present utility model and traditional condenser microphone are similar, comprise a shell equally with sound wave input hole, the capacitive part that has a field effect transistor, a printed circuit board 1 in the shell and constitute by vibrating diaphragm and rear electrode plate, open with the liner insulation between described vibrating diaphragm and the rear electrode plate, this rear electrode plate has a plurality of through holes, the control gate that the change of the electric capacity that it is caused by described vibrating diaphragm changes into an electrical potential difference and this electrical potential difference is supplied to described field effect transistor; The printed circuit of described printed circuit board (PCB) 1 is electrically connected with each terminals of described field effect transistor 2.With reference to figure 1, the difference of it and traditional microphones is, in order to abate the noise better, on described printed circuit board (PCB) 1, also be integrated with two capacitors 3,4 that capacitance is different, their capacitance is respectively 10PF and 33PF, two capacitors are connected between the source electrode and drain electrode of described field effect transistor 2 in parallel, and two capacitors 3,4 are located at phase the same side of field effect transistor 2 on printed circuit board (PCB) 1.
Fig. 2 is second kind of execution mode of the present utility model, and its structure and first kind of execution mode are similar substantially, and the connection of two capacitors is also identical, and unique difference is that two capacitors 3,4 are located at the both sides of field effect transistor 2 respectively.
More than cited be preferred embodiment of the present utility model, but the quantity of its capacitor is not limited to two, can be one also can be more than three, its capacitance is restriction particularly also, can be identical also can be different.
Claims (4)
1, a kind of condenser microphone, comprise printed circuit board (PCB), field effect transistor and the capacitive part that constitutes by vibrating diaphragm and rear electrode plate, the rear electrode plate is electrically connected with the grid of field effect transistor, it is characterized in that: be connected with the capacitor that is used to abate the noise on the described printed circuit board (PCB).
2, condenser microphone according to claim 1 is characterized in that: the described capacitor that is used to abate the noise is connected between the source electrode and drain electrode of field effect transistor.
3, condenser microphone according to claim 1 is characterized in that: the described capacitor that is used to abate the noise has two.
4, condenser microphone according to claim 1 is characterized in that: the described capacitor that is used to abate the noise is integrated in printed circuit board (PCB).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420045189 CN2689635Y (en) | 2004-04-22 | 2004-04-22 | Capacitor microphones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420045189 CN2689635Y (en) | 2004-04-22 | 2004-04-22 | Capacitor microphones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2689635Y true CN2689635Y (en) | 2005-03-30 |
Family
ID=34672026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420045189 Expired - Fee Related CN2689635Y (en) | 2004-04-22 | 2004-04-22 | Capacitor microphones |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2689635Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949075A (en) * | 2017-11-15 | 2018-04-20 | 深圳市科比特航空科技有限公司 | Sensor temperature drift suppression circuit |
-
2004
- 2004-04-22 CN CN 200420045189 patent/CN2689635Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949075A (en) * | 2017-11-15 | 2018-04-20 | 深圳市科比特航空科技有限公司 | Sensor temperature drift suppression circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |