CN102075841A - Electret microphone - Google Patents
Electret microphone Download PDFInfo
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- CN102075841A CN102075841A CN2011100511319A CN201110051131A CN102075841A CN 102075841 A CN102075841 A CN 102075841A CN 2011100511319 A CN2011100511319 A CN 2011100511319A CN 201110051131 A CN201110051131 A CN 201110051131A CN 102075841 A CN102075841 A CN 102075841A
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- shell
- drain pan
- tone
- circuit board
- electret
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Abstract
The invention relates to an electret microphone. The electret microphone comprises a shell and a membrane component, an insulating gasket, a back electret component, an insulating cavity and a circuit board component which are arranged in the shell in sequence, wherein the back electret component is electrically connected with the circuit board component; and the shell comprises a bottom shell and a top shell, the bottom shell and the top shell are sleeved to form an accommodating cavity for accommodating the membrane component, the insulating gasket, the back electret component, the insulating cavity and the circuit board component, the circuit board component is arranged close to the top shell, and the surface, parallel to the membrane component, of the top shell, is a plane. The top shell of the electret microphone is directly manufactured by a mold, and the smoothness of the top part is much higher than that of shell edges curled by the traditional method, so that the SMT difficulty of the electret microphone is lowered, and the qualification rate of products is improved.
Description
[technical field]
The present invention relates to the microphone field, relate in particular to a kind of electret microphone.
[background technology]
In the portable communications field, most of circular crimping or the square bead designs of adopting of traditional electret microphone.But the surface smoothness of circular crimping or square crimping electret microphone product is not high, be unfavorable for large-scale SMT (Surface Mounted Technology, surface mounting technology) production, and the qualification rate of product is low behind the SMT, and performance is relatively poor relatively.
[summary of the invention]
Based on this, be necessary the electret microphone that provides a kind of surface smoothness higher.
A kind of electret microphone, comprise shell and the diaphragm unit that sets gradually in the enclosure, insulation spacer, backplane assembly, insulation cavity and circuit board assemblies, backplane assembly and circuit board assemblies electrically connect, shell comprises drain pan and top shell, drain pan and top valve jacket connect to form a host cavity that is used to accommodate diaphragm unit, insulation spacer, backplane assembly, insulation cavity and circuit board assemblies, circuit board assemblies is provided with near the top shell, and the shell surface parallel with diaphragm unit in top is a plane.
Preferably, drain pan comprises square bottom and the drain pan extension that forms along the bottom margin vertical extent; The top shell comprises square top and the top shell extension that forms along the top vertical extent, and the top of top shell offers the opening that is used to expose circuit board assemblies; The internal diameter of top shell extension and the external diameter of drain pan extension is adaptive or the internal diameter of the external diameter of top shell extension and drain pan extension is adaptive.
Preferably, circuit board assemblies comprises wiring board, is located at wiring board near a plurality of conducting boss of opening one side and be located at the impedance transformer and the capacitance resistance element of wiring board opposite side.
Preferably, the bottom of drain pan offers tone-entering hole.
Preferably, the bottom lock of drain pan, wiring board offers tone-entering hole, and tone-entering hole runs through in a plurality of conducting boss, and tone-entering hole is communicated with the cavity that insulation cavity and backplane assembly and wiring board form.
Preferably, the bottom lock of drain pan, wiring board offers tone-entering hole, and tone-entering hole runs through in a plurality of conducting boss, and the insulation cavity offers the through hole that runs through the cavity that insulate at the tone-entering hole place, and tone-entering hole and through hole are communicated with the cavity of drain pan and diaphragm unit formation.
Preferably, be provided with gasket ring between the bottom of diaphragm unit and drain pan.
Preferably, also comprise the seal that is located at the slit between top shell and the drain pan.
Preferably, diaphragm unit comprises the conduction zona that closely contacts with outer casing bottom and is located at the vibrating diaphragm that conducts electricity between zona and the insulation spacer.
Preferably, the backplane assembly comprises the back pole plate that offers at least one backplane tone-entering hole and is located at electret film on the back pole plate, and electret film is arranged on the back pole plate side near diaphragm unit.
The top shell of above-mentioned electret microphone is directly made by mould, and the shell edge of the evenness at its top after far above traditional crimping, thereby the difficulty when having reduced electret microphone SMT improve the production qualification rate of product; In addition, adopt two-layer shell structure, on performance, corresponding area reduces between the electric-conductor that electrically connects backplane assembly and circuit board assemblies in the insulation cavity and the shell, makes parasitic capacitance reduce, the noise reduction.
This electret microphone during fabrication, and is easy to process, and the efficient height can carry out large-scale production; Production technology is regulated easy, management and control easily; Top shell downforce is adjustable, can not damage inner structure; Equipment is simple, can reduce the input of production equipment.
[description of drawings]
Fig. 1 is the schematic perspective view of the electret microphone of embodiment 1;
Fig. 2 be among Fig. 1 electret microphone along the cutaway view of I-I line;
Fig. 3 is the schematic perspective view of the electret microphone of embodiment 2;
Fig. 4 be among Fig. 3 electret microphone along the cutaway view of II-II line;
Fig. 5 is the cutaway view of the electret microphone of embodiment 3.
[embodiment]
Mainly reaching specific embodiment below in conjunction with the accompanying drawings is described in further detail electret microphone.
Embodiment 1
As depicted in figs. 1 and 2, the electret microphone 100 of present embodiment comprises shell 110 and the diaphragm unit 120 that sets gradually, insulation spacer 130, backplane assembly 140, insulation cavity 150, circuit board assemblies 160, electric-conductor 170 and seal 180 in shell 110.Electrically connect by electric-conductor 170 between backplane assembly 140 and the circuit board assemblies 160.
Shell 110 comprises drain pan 112 and top shell 116.Top shell 116 and these drain pan 112 sockets, to form a host cavity that is used for ccontaining diaphragm unit 120, insulation spacer 130, backplane assembly 140, insulation cavity 150 and circuit board assemblies 160, wherein circuit board assemblies 160 is provided with near top shell 116.The top 117 of top shell 116, also promptly parallel with diaphragm unit 120 surface is a planar structure.
Drain pan 112 comprises square bottom 113 and the drain pan extension 114 that 113 edge-perpendicular extend to form along the bottom.Top shell 116 comprises square top 117 and the top shell extension 118 that 117 edge-perpendicular extend to form along the top.Top shell 112 and drain pan 116 all are roughly the untight rectangular housing of a side.Wherein, the middle part at the top 117 of top shell 116 offers and is used for the opening 119 that part is exposed circuit board assemblies 160.The internal diameter of the top shell extension 118 of present embodiment and the external diameter of drain pan extension 114 are adaptive, thereby drain pan 112 can be nested in the top shell 116.In other embodiments, the external diameter of top shell extension 118 can also be adaptive with the internal diameter of drain pan extension 114, thereby top shell 116 can be nested in the drain pan 112.
Slit between drain pan 112 and the top shell 116 adopts seal 180 to seal, and seal 180 can be rubber ring, rubber blanket or glue etc.
The middle part of the bottom 113 of the drain pan 112 of present embodiment offers tone-entering hole 115.Preferably, shell 110 also is provided with in the position of tone-entering hole 115 and is used to prevent that dust from entering structures such as the dustcloth of electret microphone 100 or Air Filter.
The diaphragm unit 120 of present embodiment comprises the conduction zona 122 that closely contacts with the bottom 113 of drain pan 112 and is located at the vibrating diaphragm 124 that conducts electricity between zona 122 and the insulation spacer 130.Vibrating diaphragm 124 is provided with the metallic diaphragm (not shown) near a side of resonant cavity 190.Preferably, conduction zona 122 be a metal material, and vibrating diaphragm 124 is a macromolecule membrane, and as PPS (polyphenylene sulfide) film etc., metallic diaphragm can be the nickel metal layer of using always.
Electrically connect by electric-conductor 170 between backplane assembly 140 and the circuit board assemblies 160.The electric-conductor 170 of present embodiment is the copper post, in other preferred embodiments, electric-conductor 170 can also be structures such as conductive pin, electroconductive elastic sheet, power spring or conduction connection ring, the metal or alloy making that conductivity such as further preferably copper are good, less with the parasitic capacitance of shell 110 generations.
The external sound signal enters in the shell 110 by the tone-entering hole of offering on the shell 110 115, cause vibrating diaphragm 124 vibrations that are contained in the diaphragm unit 120 in the shell 110, further cause the variation of capacity plate antenna between vibrating diaphragm 124 and the backplane assembly 140, produce the alternating voltage signal, finish the conversion of acoustoelectric signal; By electric-conductor 170 signal of telecommunication is passed to circuit board assemblies 160 again,, transmit signals to conducting boss 164 through impedance variation.
The top shell 116 of the electret microphone 100 of present embodiment is directly made by mould, and the shell edge of the evenness at its top 117 after far above traditional crimping, thereby the difficulty when having reduced electret microphone 100SMT improve the production qualification rate of product.In addition, adopt two-layer shell structure, on performance, corresponding area reduces between the electric-conductor 170 that electrically connects backplane assemblies 140 and circuit board assemblies 160 in the insulation cavity 150 and the shell 110, makes parasitic capacitance reduce, the noise reduction.
Further, electret microphone 100 during fabrication, and is easy to process, and the efficient height can carry out large-scale production; Production technology is regulated easy, management and control easily; Shell 116 downforce in top are adjustable, can not damage inner structure; Equipment is simple, can reduce the input of production equipment.
Embodiment 2
As shown in Figure 3 and Figure 4, the electret microphone 200 of present embodiment comprises shell 210 and the diaphragm unit 220 that sets gradually, insulation spacer 230, backplane assembly 240, insulation cavity 250, circuit board assemblies 260, electric-conductor 270 and seal 280 in shell 210.Electrically connect by electric-conductor 270 between backplane assembly 240 and the circuit board assemblies 260.
Diaphragm unit 220 comprises the conduction zona 222 that closely contacts with the bottom 213 of drain pan 212, and is located at the vibrating diaphragm 224 between conduction zona 222 and the insulation spacer 230.Vibrating diaphragm 224 is provided with the metallic diaphragm (not shown) near a side of resonant cavity 290.
Circuit board assemblies 260 comprises wiring board 262, is located at impedance transformer 266 and capacitance resistance element 268 that wiring board 262 exposes a plurality of conducting boss 264 of a side and is located at wiring board 262 opposite sides.Conducting boss 264 is exposed opening 219 positions at top shell 216 as the output of electret microphone 200.
Bottom 213 sealings of the drain pan 212 of present embodiment.Wiring board 262 offers tone-entering hole 265, and tone-entering hole 265 runs through in a plurality of conducting boss 264.Tone-entering hole 265 is communicated with the cavity 252 that insulation cavity 250 and backplane assembly 240 and wiring board 262 form.
Accordingly, electret microphone 200 is provided with gasket ring 215 between diaphragm unit 220 and bottom 213, thereby drain pan 212 cooperates gasket ring 215 and diaphragm unit 220 to constitute resonant cavity 290.Gasket ring 215 shapes of present embodiment are adaptive with conduction zona 222, and the thickness of gasket ring 215 cooperates the thickness of conduction zona 222 to reach the dimensional requirement of resonant cavity 290.In addition, in a preferred embodiment, gasket ring 215 can also be one-body molded with drain pan 212, also promptly offers in the bottom 213 of drain pan 212 and conduct electricity structures such as adaptive groove of zona 222 or opening.
Embodiment 3
As shown in Figure 5, the electret microphone 300 of present embodiment comprises shell 310 and the diaphragm unit 320 that sets gradually, insulation spacer 330, backplane assembly 340, insulation cavity 350, circuit board assemblies 360, electric-conductor 370 and seal 380 in shell 310.Electrically connect by electric-conductor 370 between backplane assembly 340 and the circuit board assemblies 360.
Shell 310 similar embodiment 1 comprise drain pan 312 and top shell 316.Wherein, drain pan 312 comprises square bottom 313, and the drain pan extension 314 that 313 edge-perpendicular extend to form along the bottom.Top shell 316 comprises square top 317, and the top shell extension 318 that 317 edge-perpendicular extend to form along the top.The top 317 of top shell 316, also promptly parallel with diaphragm unit 320 surface is a planar structure.The middle part at the top 317 of top shell 316 offers and is used for the opening 319 that part is exposed circuit board assemblies 360.The internal diameter of the top shell extension 318 of present embodiment and the external diameter of drain pan extension 314 are adaptive, thereby drain pan 312 can be nested in the top shell 316.Slit between drain pan 212 and the top shell 216 adopts seal 280 to seal.
Diaphragm unit 320 comprises the conduction zona 322 that closely contacts with the bottom 313 of drain pan 312, and is located at the vibrating diaphragm 324 between conduction zona 322 and the insulation spacer 330.Vibrating diaphragm 224 is provided with the metallic diaphragm (not shown) near a side of resonant cavity 290.
Bottom 313 sealings of the drain pan 312 of present embodiment.Wiring board 362 offers tone-entering hole 365, and tone-entering hole 365 runs through in a plurality of conducting boss 364.Insulation cavity 350 offers the through hole 352 that runs through the cavity 350 that insulate at tone-entering hole 365 places.Tone-entering hole 365 and through hole 352 are communicated with the cavity of drain pan 312 and diaphragm unit 320 formation.
Accordingly, electret microphone 300 is provided with gasket ring 315 between the bottom 313 of diaphragm unit 320 and drain pan 312, so that tone-entering hole 365 and through hole 352 are communicated with the cavity of drain pan 312 and diaphragm unit 320 formation.
The tone-entering hole that is appreciated that electret microphone is not limited to above-mentioned set-up mode, also can be located at a side of the drain pan of shell.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. electret microphone, comprise shell and the diaphragm unit that in described shell, sets gradually, insulation spacer, the backplane assembly, insulation cavity and circuit board assemblies, described backplane assembly and described circuit board assemblies electrically connect, it is characterized in that, described shell comprises drain pan and top shell, described drain pan and described top valve jacket connect to form one and are used to accommodate described diaphragm unit, insulation spacer, the backplane assembly, the host cavity of insulation cavity and circuit board assemblies, described circuit board assemblies is provided with near described top shell, and the shell surface parallel with described diaphragm unit in described top is a plane.
2. electret microphone as claimed in claim 1 is characterized in that, described drain pan comprises square bottom and the drain pan extension that forms along described bottom margin vertical extent; Described top shell comprises square top and the top shell extension that forms along described top vertical extent, and the top of described top shell offers the opening that is used to expose described circuit board assemblies; The external diameter of the adaptive or described top of the external diameter shell extension of the internal diameter of described top shell extension and described drain pan extension and the internal diameter of described drain pan extension are adaptive.
3. electret microphone as claimed in claim 2, it is characterized in that described circuit board assemblies comprises wiring board, be located at described wiring board near a plurality of conducting boss of described opening one side and be located at the impedance transformer and the capacitance resistance element of described wiring board opposite side.
4. as claim 2 or 3 described electret microphones, it is characterized in that the bottom of described drain pan offers tone-entering hole.
5. electret microphone as claimed in claim 3, it is characterized in that, the bottom lock of described drain pan, described wiring board offers tone-entering hole, described tone-entering hole runs through in described a plurality of conducting boss, and described tone-entering hole is communicated with the cavity that described insulation cavity and described backplane assembly and wiring board form.
6. electret microphone as claimed in claim 3, it is characterized in that, the bottom lock of described drain pan, described wiring board offers tone-entering hole, described tone-entering hole runs through in described a plurality of conducting boss, described insulation cavity offers the through hole that runs through described insulation cavity at described tone-entering hole place, and described tone-entering hole and described through hole are communicated with the cavity of described drain pan and the formation of described diaphragm unit.
7. as claim 5 or 6 described electret microphones, it is characterized in that, be provided with gasket ring between the bottom of described diaphragm unit and described drain pan.
8. electret microphone as claimed in claim 1 is characterized in that, also comprises the seal that is located at the slit between described top shell and the described drain pan.
9. electret microphone as claimed in claim 1 is characterized in that, described diaphragm unit comprises the conduction zona that closely contacts with described outer casing bottom and is located at vibrating diaphragm between described conduction zona and the described insulation spacer.
10. electret microphone as claimed in claim 1, it is characterized in that, described backplane assembly comprises the back pole plate that offers at least one backplane tone-entering hole and is located at electret film on the described back pole plate, and described electret film is arranged on the described back pole plate side near described diaphragm unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110051131.9A CN102075841B (en) | 2011-03-03 | 2011-03-03 | Electret microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110051131.9A CN102075841B (en) | 2011-03-03 | 2011-03-03 | Electret microphone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102075841A true CN102075841A (en) | 2011-05-25 |
| CN102075841B CN102075841B (en) | 2014-05-07 |
Family
ID=44034156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110051131.9A Active CN102075841B (en) | 2011-03-03 | 2011-03-03 | Electret microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102075841B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333272A (en) * | 2011-08-18 | 2012-01-25 | 东莞泉声电子有限公司 | Simple and compact electret microphone |
| CN102655617A (en) * | 2012-05-24 | 2012-09-05 | 歌尔声学股份有限公司 | Microphone and assembling method thereof |
| CN103747402A (en) * | 2014-01-06 | 2014-04-23 | 歌尔声学股份有限公司 | Microphone and assembly method thereof |
| CN105578370A (en) * | 2016-03-15 | 2016-05-11 | 深圳捷力泰科技开发有限公司 | Electret microphone |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200962670Y (en) * | 2006-07-13 | 2007-10-17 | 东莞泉声电子有限公司 | Square structure electret capacitance speaker |
| CN201491263U (en) * | 2009-07-17 | 2010-05-26 | 瑞声声学科技(常州)有限公司 | Electret microphone |
| CN101835077A (en) * | 2010-05-28 | 2010-09-15 | 深圳市豪恩声学股份有限公司 | Electret condenser microphone and manufacturing method thereof |
-
2011
- 2011-03-03 CN CN201110051131.9A patent/CN102075841B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200962670Y (en) * | 2006-07-13 | 2007-10-17 | 东莞泉声电子有限公司 | Square structure electret capacitance speaker |
| CN201491263U (en) * | 2009-07-17 | 2010-05-26 | 瑞声声学科技(常州)有限公司 | Electret microphone |
| CN101835077A (en) * | 2010-05-28 | 2010-09-15 | 深圳市豪恩声学股份有限公司 | Electret condenser microphone and manufacturing method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333272A (en) * | 2011-08-18 | 2012-01-25 | 东莞泉声电子有限公司 | Simple and compact electret microphone |
| CN102655617A (en) * | 2012-05-24 | 2012-09-05 | 歌尔声学股份有限公司 | Microphone and assembling method thereof |
| CN102655617B (en) * | 2012-05-24 | 2015-09-30 | 歌尔声学股份有限公司 | Microphone and assembly method thereof |
| CN103747402A (en) * | 2014-01-06 | 2014-04-23 | 歌尔声学股份有限公司 | Microphone and assembly method thereof |
| CN103747402B (en) * | 2014-01-06 | 2017-06-20 | 歌尔股份有限公司 | Microphone and its assemble method |
| CN105578370A (en) * | 2016-03-15 | 2016-05-11 | 深圳捷力泰科技开发有限公司 | Electret microphone |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102075841B (en) | 2014-05-07 |
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