CN202873052U - Electret capacitor microphone without back electrode plate - Google Patents
Electret capacitor microphone without back electrode plate Download PDFInfo
- Publication number
- CN202873052U CN202873052U CN 201220594339 CN201220594339U CN202873052U CN 202873052 U CN202873052 U CN 202873052U CN 201220594339 CN201220594339 CN 201220594339 CN 201220594339 U CN201220594339 U CN 201220594339U CN 202873052 U CN202873052 U CN 202873052U
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- Prior art keywords
- electret
- shell
- housing
- circuit board
- vibration
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- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
The utility model relates to an electret capacitor microphone without a back-electrode plate. The electret capacitor microphone comprises a cylindrical metal shell with an opening on the top, wherein a shell sound hole is formed in the bottom wall of the shell; an electret layer with charges is arranged on the inner bottom wall, away from the position of the sound hole, of the shell; an insulating backing ring, a vibration film, a vibration metal ring and a circuit board packaged on the opening of the shell are arranged upwards from the electret layer inside the shell in sequence; the vibration film is electrically connected with the circuit board through the vibration metal ring; an insulating chamber ring is further sleeved outside the vibration metal ring and the vibration film inside the shell; the opening at the top end of the shell wall bends towards the inner chamber of the shell so as to form a bent arc section; and the bent arc section is connected with the circuit board in a pressing manner. The electret capacitor microphone is simple in structure and smart in design, and an original back-electrode plate is replaced by using the structure that an electret film is covered on the bottom wall inside the shell, so that the back-electrode plate and the assembling step of the back-electrode plate are saved, the number of parts of the microphone is reduced and the assembling process is simplified, and further the production cost is reduced.
Description
Technical field
The utility model relates to a kind of electret microphone.
Background technology
Microphone is a kind of collected sound signal and the energy transducer that is converted into the accessible signal of telecommunication, is commonly called as words letter, microphone.The operation principle of common electret capacitor microphone is: utilize vibrating diaphragm and back pole plate to form two pole plates of electric capacity, acoustic pressure drives the vibrating diaphragm vibration changes the distance between two-plate, thereby cause that electric capacity changes, and then so that change in voltage, the size of change in voltage, the power that has reflected extraneous acoustic pressure, this change in voltage frequency has namely reflected the frequency of external sound, the microphone internal circuit board is used for receiving above-mentioned voltage signal and after treatment output.Also there is following shortcoming in existing electret capacitor microphone: 1) production cost of back pole plate is higher, and needs assembly technology to be installed in the microphone case, in addition, also needs to install polar ring and realizes being electrically connected with circuit board.2) carry electric charge on the back pole plate, in assembling process, be easy to cause loss of charge, affect induction.
The utility model content
The technical problems to be solved in the utility model provides a kind of backplateless electret capacitor microphone, the structure that this microphone utilization diapire in housing is established electret layer substitutes original back pole plate, thereby can save back pole plate and assembling process thereof, simplify amount of parts and the assemble flow of microphone, and then can reduce production costs.
For solving the problems of the technologies described above, the design feature of backplateless electret capacitor microphone of the present utility model is to comprise open-topped tubular metal shell, the position that offers the shell sound hole on the diapire of housing and avoid the shell sound hole is provided with the charged electret layer of one deck at the interior diapire of housing, upwards is provided with successively from electret layer in the housing and insulate gasket ring, vibrating membrane, vibration becket and be encapsulated in circuit board on the shell nozzle; Vibrating membrane is electrically connected with circuit board by the vibration becket, and the outside of housing inherent vibration becket and vibrating membrane also is set with insulation cavity ring.
Described electret layer forms by covering one deck electret film.
Described electret layer is formed by spraying one deck electret.
The top end opening place of described housing wall is bent to form the curved arc section to the housing inner chamber, and the curved arc section is crimped on the described circuit board.
The beneficial effects of the utility model are: by establishing the function that the charged electret layer of one deck has been realized original back pole plate at the interior diapire of housing, thereby can save back pole plate, save material and parts, simplify assemble flow; Insulation cavity ring is coated on the outside of vibration becket and vibrating membrane, has avoided metal shell and vibration becket contact short circuit, compact conformation and safe and reliable; Electret layer can be by covering electret film or the formation of spraying electret, and technique is simple, is easy to realize; The encapsulating structure of housing adopts the aduncate form in top, each parts can be compressed to be installed in the housing, so that compact conformation is firm, packaging technology is simple and reliable.The utility model is simple in structure, deft design, the structure that utilization diapire in housing is established electret layer has substituted original back pole plate, thereby can save back pole plate and installation step thereof, simplify amount of parts and the assemble flow of microphone, reduced production cost.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
Fig. 1 is structural representation of the present utility model.
Embodiment
With reference to accompanying drawing, a kind of execution mode of backplateless electret capacitor microphone of the present utility model is for comprising open-topped tubular metal shell 1, and the position that offers shell sound hole 2 on the diapire of housing 1 and avoid shell sound hole 2 is provided with the charged electret layer 3 of one deck at the interior diapire of housing 1.Upwards be provided with successively insulation gasket ring 4, vibrating membrane 5, vibrate becket 6 and be encapsulated in circuit board 7 on housing 1 opening from electret layer 3 in the housing 1.Wherein, the shape of housing 1 is preferably cylindric, and material is metal material, utilize housing 1 electric conductivity so that electret layer 3 and circuit board 7 realize being electrically connected.To sum up, by establish the charged electret layer 3 of one deck at the interior diapire of housing 1, substitute original back pole plate, electret layer 3 is realized electrical connection by metal shell 1 and circuit board 7, vibrating membrane 5 is electrically connected with circuit board 7 by vibration becket 6, electret layer 3 and vibrating membrane 5 consist of two pole plates of electric capacity, insulation gasket ring 4 separates two-plate, vibrating membrane 5 induction acoustic pressures are also vibrated so that the distance between the electric capacity two-plate changes, thereby cause that electric capacity changes, and then so that change in voltage, the size of change in voltage, the power that has reflected extraneous acoustic pressure, circuit board 7 receive above-mentioned voltage signal and after treatment output, thereby finish the acoustic-electric conversion of microphone.In addition, touch housing 1 for fear of vibration becket 6 and vibrating membrane 5, the outside of housing 1 inherent vibration becket 6 and vibrating membrane 5 also is set with insulation cavity ring 8, and as seen, insulation cavity ring 8 has played the effect of the two-plate short circuit of avoiding electric capacity.
Wherein, above-mentioned electret layer 3 can form by covering one deck electret film, also can form by spraying one deck electret, and two kinds of structures and technique are all very simple and be easy to realize.
With reference to Fig. 1, the top end opening place of housing 1 wall is bent to form curved arc section 10 to the housing inner chamber, and curved arc section 10 is crimped on the circuit board 7.Adopt this kind structure each parts can be compressed successively and be installed in the housing, so that compact conformation, encapsulation firmly.
In sum, the utility model is not limited to above-mentioned embodiment.Those skilled in the art under the prerequisite that does not break away from spirit and scope of the present utility model, can do some changes and modification.Protection range of the present utility model should be as the criterion with claim of the present utility model.
Claims (4)
1. backplateless electret capacitor microphone, it is characterized in that comprising open-topped tubular metal shell (1), the position that offers shell sound hole (2) on the diapire of housing (1) and avoid shell sound hole (2) is provided with the charged electret layer of one deck (3) at the interior diapire of housing (1), upwards is provided with successively insulation gasket ring (4), vibrating membrane (5), vibrates becket (6) and is encapsulated in circuit board (7) on housing (1) opening from electret layer (3) in the housing (1); Vibrating membrane (5) is electrically connected with circuit board (7) by vibration becket (6), and the outside of housing (1) inherent vibration becket (6) and vibrating membrane (5) also is set with insulation cavity ring (8).
2. backplateless electret capacitor microphone as claimed in claim 1 is characterized in that described electret layer (3) forms by covering one deck electret film.
3. backplateless electret capacitor microphone as claimed in claim 1 is characterized in that described electret layer (3) is formed by spraying one deck electret.
4. such as claim 1 or 2 or 3 described backplateless electret capacitor microphones, it is characterized in that the top end opening place of described housing (1) wall is bent to form curved arc section (10) to the housing inner chamber, curved arc section (10) is crimped on the described circuit board (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220594339 CN202873052U (en) | 2012-11-13 | 2012-11-13 | Electret capacitor microphone without back electrode plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220594339 CN202873052U (en) | 2012-11-13 | 2012-11-13 | Electret capacitor microphone without back electrode plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202873052U true CN202873052U (en) | 2013-04-10 |
Family
ID=48039731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220594339 Expired - Lifetime CN202873052U (en) | 2012-11-13 | 2012-11-13 | Electret capacitor microphone without back electrode plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202873052U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103561373A (en) * | 2013-09-27 | 2014-02-05 | 宁波鑫丰泰电器有限公司 | Front-pole type capacitor microphone |
-
2012
- 2012-11-13 CN CN 201220594339 patent/CN202873052U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103561373A (en) * | 2013-09-27 | 2014-02-05 | 宁波鑫丰泰电器有限公司 | Front-pole type capacitor microphone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 261200 No. 68 Fengshan Road, Fangzi District, Weifang City, Shandong Province Patentee after: GONGDA ELECTROACOUSTIC Co.,Ltd. Address before: 261200 No. 68 Fengshan Road, Fangzi District, Weifang City, Shandong Province Patentee before: Shandong Gettop Acoustic Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |