CN201167414Y - Miniature capacitance microphone - Google Patents
Miniature capacitance microphone Download PDFInfo
- Publication number
- CN201167414Y CN201167414Y CNU2008200182989U CN200820018298U CN201167414Y CN 201167414 Y CN201167414 Y CN 201167414Y CN U2008200182989 U CNU2008200182989 U CN U2008200182989U CN 200820018298 U CN200820018298 U CN 200820018298U CN 201167414 Y CN201167414 Y CN 201167414Y
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- China
- Prior art keywords
- circuit board
- base plate
- board frame
- wiring board
- circuit
- 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 - Lifetime
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Abstract
The utility model discloses a miniature condenser microphone comprising a microphone protection structure which is composed of a circuit board substrate with an electronic component, a circuit board framework and a bottom board, a capacitor component for carrying out the acoustical-electrical conversion is arranged in the protection structure, a sound hole for picking up a sound signal is arranged on the protection structure, the capacitor component and a circuit of the circuit board substrate which are electrically communicated are fixedly arranged on the circuit board framework; the design reduces parts, eliminates an elastic device with the reliability hidden danger and achieves lower size, simple assembly process, convenient automatic production, low production cost and good product reliability.
Description
Technical field
The utility model relates to a kind of mini microphone, relates to a kind of miniature capacitance type microphone specifically.
Background technology
Along with electronic products such as mobile phone, notebook, hearing aids are more and more littler to the dimensional requirement of inner body, take measurements greatly less, quality is better and lower-cost miniature capacitance type microphone is employed.At present; the miniature capacitance type microphone volume that has occurred on the market is generally on tens cubic millimeters size; under this size; if according to traditional miniature capacitance type microphone design; basic structure is that a metal shell and a wiring board form the protection structure; inside is equipped with plays support; the plastic chamber of insulating effect; inside cavity is equipped with the metal grating ring and is used for circuit turn-on; grating ring connects pole plate; pole plate forms capacitance component by an insulation diaphragm and vibrating diaphragm, because the size of its inner body is bigger; quantity is more, certainly will influence properties of product; say from technical standpoint, exist contradictory relation between the size of product and the performance.So, there is new design to propose to use an elastic sheet metal or spring to replace original grating ring, this can improve properties of product to a certain extent, but the problem that exists is because the elastic part size of this structure applications is minimum, the assembly technology complexity, part production difficulty is big, cost is high, product reliability is not enough, and the difficulty of automated production strengthens, and this constructed products, the highly constrained further reduction of product total height of elastic part.
So, need design a kind of can reach lower size, assembly technology simple, be convenient to automated production, production cost is low, product reliability is good new construction miniature capacitance type microphone.
The utility model content
Technical problem to be solved in the utility model provide a kind of can reach lower size, assembly technology simple, be convenient to automated production, production cost is low, product reliability is good miniature capacitance type microphone.
For solving the problems of the technologies described above; the technical solution of the utility model is: miniature capacitance type microphone; the microphone protection structure that comprises wiring board substrate, circuit board frame and base plate composition that electronic devices and components are installed; described protection inside configuration is equipped with the capacitance component that carries out the acoustic-electric conversion; described protection structure is provided with the sound hole that is used to pick up voice signal, is installed with the circuit of described capacitance component of electric connection and described wiring board substrate on the described circuit board frame.
As a kind of improvement, the faying face between described wiring board substrate and the described circuit board frame is provided with the Anisotropically conductive layer.
As further improvement, the inboard, junction of the lower end of described circuit board frame and/or described base plate is provided with the step that fixedly holds described capacitance component.
As further improvement, described base plate is metal base plate or wiring board base plate.
As further improvement, described capacitance component comprises back pole plate, vibrating diaphragm and is arranged at isolation diaphragm between the two, described back pole plate is electrically communicated to described wiring board substrate by the circuit that is arranged on described circuit board frame side surface or body interior, and described vibrating diaphragm is electrically communicated to described wiring board substrate by described base plate and another circuit that is arranged on described circuit board frame side surface or body interior.
As further improvement, described capacitance component comprises back pole plate, diaphragm and is arranged at isolation diaphragm between the two; Described back pole plate is electrically communicated to described wiring board substrate by the circuit that is arranged on described circuit board frame side surface or body interior; Described base plate is provided with the step that holds fixing described diaphragm, and the edge one of described diaphragm is fixed on the step of plate-like base plate, and is electrically communicated to described wiring board substrate by another circuit that is arranged on described base plate and circuit board frame side surface or body interior.
As further improvement, described base plate is a metal base plate and as an electrode of capacitance component, described base plate step inside is provided with isolation diaphragm and a vibrating diaphragm, described capacitance component comprises described base plate, vibrating diaphragm and is arranged at isolation diaphragm between the two, described base plate is electrically communicated to described wiring board substrate by the circuit that is arranged on described circuit board frame side surface or body interior, and described vibrating diaphragm is electrically communicated to described wiring board substrate by another circuit that is arranged on described circuit board frame side surface or body interior.
Improvement of the present utility model is, the circuit of described capacitance component of the electric connection on the described circuit board frame and described wiring board substrate perhaps runs through the metal aperture of described circuit board frame body interior for covering the metal level of described circuit board frame outer surface and inner surface.
Improvement of the present utility model is that the inner surface of described circuit board frame or outer surface are provided with the shielded metal layer.
Improvement of the present utility model is, is provided with the ACF rete between described base plate and the described circuit board frame.
In the utility model, selected board substrate is generally resin material.
In the utility model, circuit turn-on between the wiring board inside is the industry known technology, generally by the surface at wiring board metal level being set is provided with planar circuit and arranges, by the circuit turn-on that plated-through hole reaches the wiring board both sides being set at the circuit intralamellar part, do not influence creativeness of the present utility model at this, be not described in detail.
In the utility model, the wiring board substrate outside generally is provided with and is used for the Reflow Soldering automatic chip mounting and is installed to the pad on the electronic product main circuit board or is used for the solder joint etc. that bonding wire connects usefulness, is the industry known technology, is not described in detail at this.
In the utility model, the outer shape of circuit board frame and inner space can be shapes such as square, circular, ellipse, and the shape of corresponding wiring board substrate and base plate and internal capacitance assembly can be done suitable adjustment.
Owing to adopted technique scheme, miniature capacitance type microphone, the microphone protection structure that comprises wiring board substrate, circuit board frame and base plate composition that electronic devices and components are installed, described protection inside configuration is equipped with the capacitance component that carries out the acoustic-electric conversion, described protection structure is provided with the sound hole that is used to pick up voice signal, is installed with the circuit of described capacitance component of electric connection and described wiring board substrate on the described circuit board frame; This design has reduced part, has removed the elastic device with reliability hidden danger, can reach lower size, assembly technology simple, be convenient to automated production, production cost is low, product reliability good.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment one;
Fig. 2 is the tangent plane schematic diagram of the utility model embodiment one;
Fig. 3 is the structural representation of the utility model embodiment two;
Fig. 4 is the tangent plane schematic diagram of the utility model embodiment two;
Fig. 5 is the structural representation of the utility model embodiment three;
Fig. 6 is the tangent plane schematic diagram of the utility model embodiment three;
Fig. 7 is the structural representation of the utility model embodiment four.
Embodiment
Embodiment one: as shown in Figure 1 and Figure 2; the external shape of the miniature capacitance type microphone that present embodiment provides and inner space all are square; comprise a square wiring board substrate 1, a square frame shape circuit board frame 2 and the sandwich protection structure that square metal base plate 3 combines and forms, the protection inside configuration is equipped with capacitance component.Wiring board substrate 1 installed inside is useful on the electronic devices and components 11 of amplification signal, and inside is provided with Copper Foil and circuit, for known technology in the industry, no longer illustrates at this; The inside and outside both sides of circuit board frame 2 are provided with the two metal layers (Copper Foil 21 and 22) of mutually insulated, and the inboard at 23 places, lower end of circuit board frame 2 is provided with a step that can be used for locating; The edge of square metal base plate 3 is provided with step 31, and its inside is provided with the sound hole 32 that is used to pick up voice signal; Capacitance component comprises a pole plate 4, an insulation diaphragm 5 and a vibrating diaphragm 6, wherein pole plate 4 and vibrating diaphragm 6 form a plane-parallel capacitor at interval by insulation diaphragm 5, and capacitance component is fixed on the lower end 23 formed steps of circuit board frame 2; The edge of vibrating diaphragm 6 directly is fixed on the step 31 of metal base plate 3; In the implementation case, the base material preferred resin material of wiring board substrate and circuit board frame, the preferred aluminum metal of metal base plate.
When miniature capacitance type microphone is worked, voice signal enters from sound hole 32, affact on the vibrating diaphragm 6 and cause vibrating diaphragm 6 vibration, thereby and produce the signal of telecommunication between the pole plate 4, pole plate 4 is electrically communicated on the wiring board substrate 1 by the Copper Foil on the circuit board frame 2 21, and vibrating diaphragm 6 is electrically communicated on the wiring board substrate 1 by the Copper Foil 22 on metal base plate 3 and the circuit board frame 2 and keeps ground connection.
In the implementation case, the shape of each part is all comparatively regular, number of spare parts is few, and the part generation relatively moves in this structure space and possibility are all very little, this just can guarantee reliability of products, and assembly technology is simple, be easy to use automated production, enhance productivity; By simplifying the internal structure of product, can be so that the height of product and the area of plane can reduce significantly, and do not sacrifice the performance of product, can guarantee the needed product of better products performance inner space; The ground connection Copper Foil of circuit board frame outside can guarantee anti-preferably electromagnetic interference effect.
Embodiment two: as Fig. 3; shown in Figure 4; the external shape of the miniature capacitance type microphone that present embodiment provides is square; the inboard is shaped as circle; comprise a square wiring board substrate 1; the shaped as frame circuit board frame 2 of a square-outside and round-inside; square metal base plate 3 and one deck ACF (abbreviation of Anisotropic ConductiveFilm; the Chinese implication is an anisotropic conductive film; also be called anisotropic conductive; its main feature is by after the hot pressing; can conduct electricity in a longitudinal direction; and can not conduct electricity in a lateral direction) film 7 combines and form the protection structure, the protection inside configuration is equipped with capacitance component.Wiring board substrate 1 installed inside is useful on the electronic devices and components 11 of amplification signal, and inside is provided with Copper Foil and circuit, for known technology in the industry, no longer illustrates at this; The inside of circuit board frame 2 is provided with to be run through up and down and two parts metal aperture 21 and 22 of mutually insulated; Metal aperture 21 is arranged on circuit board frame 2 internal diameters circle line with interior position, thereby makes things convenient for it to be communicated with capacitance component; Metal aperture 22 is arranged on four bights of circuit board frame 2, because the shape of circuit board frame 2 square-outside and round-insides makes that its space, four bights is comparatively abundant; There is a step that can be used for locating capacitance component at 23 places, lower end of circuit board frame 2; Square metal base plate 3 inside are provided with the sound hole 32 that is used to pick up voice signal; In the implementation case, square metal base plate 3 also plays the effect of an electrode of capacitance component, square metal base plate 3 and an insulation diaphragm 5 and the vibrating diaphragm 6 common plane-parallel capacitors that form, and vibrating diaphragm 6 also is fixed on the becket 61, becket 61 be fixed on the lower end 23 formed steps of circuit board frame 2 and and metal aperture 21 electric connections; Metal base plate 3 is electrically communicated on the wiring board substrate 1 by the metal aperture 22 of circuit board frame 2 inside.
The miniature capacitance type microphone of this structure, its structure is further simplified, and adopted one deck ACF film between wiring board and the wiring board, this film can play the effect of bonding and electric connection simultaneously, and more crucial be, this ACF film can reach vertical conduction in narrow and small plane, the effect of level insulation, comparatively be fit to electrical connection complicated between the two-layer wiring board, and the shown miniature capacitance type microphone of the implementation case, its input signal circuit and earthed circuit all are arranged on the inside of circuit board frame, adopt the ACF film can better realize this reliability of products, and can enhance productivity, certainly, adopt the other materials of similar ACF film function also can reach approximate effect equally.
Embodiment three: shown in Fig. 5,6, the main difference of miniature capacitance type microphone that present embodiment provides and case study on implementation two has 2 points, the one, capacitance component is pole plate 4, be fixed on the vibrating diaphragm 6 on the becket 61 and the insulation diaphragm 5 that is arranged between the two is formed, and is fixed on the lower end 23 formed steps of circuit board frame 2; The 2nd, the arranged outside of circuit board frame 2 be used to resist the Copper Foil 24 of electromagnetic interference.This capacitance component is designed to traditional Element Design, relatively easy production, and Copper Foil 24 can be so that the ability reinforcement of miniature capacitance type microphone opposing electromagnetic interference.
Embodiment four: as shown in Figure 7, the main difference of miniature capacitance type microphone that present embodiment provides and case study on implementation three is that base plate 3 is to adopt wiring board to make, and the edge of base plate 3 is provided with sidewall 31 upwards, and the inwall of circuit board frame 2 is up and down concordant, and the thickness of the sidewall 31 of base plate 3 is less than the sidewall thickness of circuit board frame 2, thereby the lower end at circuit board frame 2 forms step, and capacitance component is arranged in the step.The miniature capacitance type microphone of this design, pole plate 4 is electrically communicated on the wiring board substrate 1 by metal aperture 21 and ACF film 7, vibrating diaphragm 6 is electrically communicated on the wiring board substrate 1 to metal aperture 22 and by ACF film 7 by the circuit communication of base plate 3 inside, the circuit design of base plate 3 inside is a known technology, no longer describes in detail.This design and in the lower end of circuit board frame 2 step to be set be Approximate Design, the effect that is reached also is the same, all is in order to be convenient to the fixing of capacitance component.
Claims (10)
1. miniature capacitance type microphone; the microphone protection structure that comprises wiring board substrate, circuit board frame and base plate composition that electronic devices and components are installed; described protection inside configuration is equipped with the capacitance component that carries out the acoustic-electric conversion; described protection structure is provided with the sound hole that is used to pick up voice signal, it is characterized in that: the circuit that is installed with described capacitance component of electric connection and described wiring board substrate on the described circuit board frame.
2. miniature capacitance type microphone as claimed in claim 1 is characterized in that: the faying face between described wiring board substrate and the described circuit board frame is provided with the Anisotropically conductive layer.
3. miniature capacitance type microphone as claimed in claim 1 or 2 is characterized in that: the inboard, junction of the lower end of described circuit board frame and/or described base plate is provided with the step that fixedly holds described capacitance component.
4. miniature capacitance type microphone as claimed in claim 3 is characterized in that: described base plate is metal base plate or wiring board base plate.
5. miniature capacitance type microphone as claimed in claim 4, it is characterized in that: described capacitance component comprises back pole plate, vibrating diaphragm and is arranged at isolation diaphragm between the two, described back pole plate is electrically communicated to described wiring board substrate by the circuit that is arranged on described circuit board frame side surface or body interior, and described vibrating diaphragm is electrically communicated to described wiring board substrate by described base plate and another circuit that is arranged on described circuit board frame side surface or body interior.
6. miniature capacitance type microphone as claimed in claim 4 is characterized in that: described capacitance component comprises back pole plate, diaphragm and is arranged at isolation diaphragm between the two; Described back pole plate is electrically communicated to described wiring board substrate by the circuit that is arranged on described circuit board frame side surface or body interior; Described base plate is provided with the step that holds fixing described diaphragm, and the edge one of described diaphragm is fixed on the step of plate-like base plate, and is electrically communicated to described wiring board substrate by another circuit that is arranged on described base plate and circuit board frame side surface or body interior.
7. miniature capacitance type microphone as claimed in claim 4, it is characterized in that: described base plate is a metal base plate and as an electrode of capacitance component, described base plate step inside is provided with isolation diaphragm and a vibrating diaphragm, described capacitance component comprises described base plate, vibrating diaphragm and be arranged at isolation diaphragm between the two, described base plate is electrically communicated to described wiring board substrate by the circuit that is arranged on described circuit board frame side surface or body interior, and described vibrating diaphragm is electrically communicated to described wiring board substrate by another circuit that is arranged on described circuit board frame side surface or body interior.
8. miniature capacitance type microphone as claimed in claim 1 or 2, it is characterized in that: the circuit of described capacitance component of the electric connection on the described circuit board frame and described wiring board substrate perhaps runs through the metal aperture of described circuit board frame body interior for covering the metal level of described circuit board frame outer surface and inner surface.
9. miniature capacitance type microphone as claimed in claim 1 or 2 is characterized in that: the inner surface of described circuit board frame or outer surface are provided with the shielded metal layer.
10. miniature capacitance type microphone as claimed in claim 1 or 2 is characterized in that: be provided with the Anisotropically conductive rete between described base plate and the described circuit board frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200182989U CN201167414Y (en) | 2008-03-01 | 2008-03-01 | Miniature capacitance microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200182989U CN201167414Y (en) | 2008-03-01 | 2008-03-01 | Miniature capacitance microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201167414Y true CN201167414Y (en) | 2008-12-17 |
Family
ID=40192807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200182989U Expired - Lifetime CN201167414Y (en) | 2008-03-01 | 2008-03-01 | Miniature capacitance microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201167414Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10129623B2 (en) | 2017-03-15 | 2018-11-13 | Microsoft Technology Licensing, Llc | Electronic device having covering substrate carrying acoustic transducer and related technology |
-
2008
- 2008-03-01 CN CNU2008200182989U patent/CN201167414Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10129623B2 (en) | 2017-03-15 | 2018-11-13 | Microsoft Technology Licensing, Llc | Electronic device having covering substrate carrying acoustic transducer and related technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20081217 Effective date of abandoning: 20080301 |