CN203039883U - Magnetic shielding device for earphone circuit board - Google Patents
Magnetic shielding device for earphone circuit board Download PDFInfo
- Publication number
- CN203039883U CN203039883U CN 201320056581 CN201320056581U CN203039883U CN 203039883 U CN203039883 U CN 203039883U CN 201320056581 CN201320056581 CN 201320056581 CN 201320056581 U CN201320056581 U CN 201320056581U CN 203039883 U CN203039883 U CN 203039883U
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- China
- Prior art keywords
- circuit board
- earphone
- loudspeaker
- radome
- magnetic
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Abstract
The utility model discloses a magnetic shielding device for an earphone circuit board and relates to the technical field of active earphones. The magnetic shielding device for the earphone circuit board includes a shielding case disposed between a horn of the earphone and the circuit and used for preventing magnetic field produced by inductance elements on the circuit board from disturbing the shielding case of the horn. An open end of the shielding case is combined on the circuit board and the shielding case is made of permeability magnetic material. By adopting the magnetic shielding device for the earphone circuit board provided by the utility model, a technical problem that magnetic field produced by a circuit board in a prior earphone generates interference of a horn in the prior art is solved. The magnetic shielding device for the earphone circuit board provided by the utility model is simple in structure and reduces interference of the horn caused by inductance elements on the circuit board in the earphone in a limited space in the earphone. The noise of the horn is reduced and the sound quality and the quality of the earphone are improved.
Description
Technical field
The utility model relates to active earphone technical field, particularly a kind of circuit board magnetic shielding device of active earphone.
Background technology
Earphone is personal stereo equipment, and it is distinguished from source of sound, can be divided into active earphone and Passive earphone, and active earphone mainly comprises circuit board and the loudspeaker that are oppositely arranged.As everyone knows, if the loudspeaker of earphone are interfered, will produce noise, seriously influence the tonequality of earphone.
At present, those skilled in the art has taked multiple shielding mode at the interference problem of earphone, but majority all is electrostatic interference or the electromagnetic radiation that produces at the electronic product that is connected with earphone, all be the measure that the interference of earphone outside is taked, the magnetic field that these measures produce the earphone internal circuit to the interference of loudspeaker almost without any effect.Those skilled in the art just find that not the earphone internal circuit can produce this problem of interference to loudspeaker at all, below in conjunction with 1 pair of earphone internal circuit of accompanying drawing the interference principle of loudspeaker is done explanation: head circuit plate 2 is provided with a lot of inductance elements 3, these inductance elements 3 can produce the magnetic field of low frequency variations, because the inner space of earphone is very little, the magnetic line of force 4 in the magnetic field of these low frequency variations will be coupled to loudspeaker 1, thereby loudspeaker 1 are produced interference, the sound that loudspeaker 1 send will have noise, influence the tonequality of earphone, reduced the quality of earphone.
The utility model content
Based on above deficiency, technical problem to be solved in the utility model provides a kind of head circuit plate magnetic shielding device, this head circuit plate magnetic shielding device can produce circuit board the magnetic line of force water conservancy diversion in magnetic field to the far-end of loudspeaker, the magnetic line of force and loudspeaker are isolated, reduce the noise of loudspeaker, improved the tonequality of earphone.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of head circuit plate magnetic shielding device, comprise that being used between the loudspeaker that are arranged on described earphone and the circuit board prevent the radome of the described loudspeaker of magnetic interference that the inductance element on the described circuit board produces, the openend of described radome is incorporated on the described circuit board; Described radome adopts permeability magnetic material to make.
Wherein, described radome is the cylinder-like structure of an end opening.
Wherein, the radius of described radome is greater than the radius of described loudspeaker, and the edge of described radome is away under the described loudspeaker.
Wherein, the central lines of the center line of described radome and described loudspeaker.
Wherein, described permeability magnetic material is permalloy 80, Mumetal, 48 dilvals or ULCS.
The beneficial effects of the utility model are: the utility model head circuit plate magnetic shielding device comprises the radome that is used for preventing the magnetic interference loudspeaker that the inductance element on the circuit board produces between the loudspeaker that are arranged on earphone and the circuit board, and the openend of radome is incorporated on the circuit board; Radome adopts permeability magnetic material to make.Owing to set up the radome that is made by permeability magnetic material in the earphone inner space between loudspeaker and circuit board, radome redirects the magnetic line of force in the magnetic field that the inductance element on the circuit board produces in the magnetic circuit that has been assigned to new regulation, and magnetic line of force water conservancy diversion has been arrived the far-end of loudspeaker.Namely, the magnetic field magnetic line that inductance element on the circuit board sends has been got back to another utmost point in magnetic field via radome, and be not radiated the residing position of loudspeaker, thereby realized the magnetic radiation on the circuit board and loudspeaker are isolated, reduced the magnetic field that produces on the circuit board to the interference of loudspeaker, reduce the noise of loudspeaker, improved the tonequality of earphone.The radome that adopts the ultra-low-carbon steel material of 0.5mm to make confirms through test, and the inhibition level of noise more than 10db, has effectively been reduced the noise of loudspeaker.
Because the radius of radome is greater than the radius of loudspeaker, and the edge of radome is away under the loudspeaker.This mounting means can so that the edge of radome away from loudspeaker, from DISTRIBUTION OF MAGNETIC FIELD as can be known, the magnetic field, edge of radome is stronger, influence to loudspeaker is bigger, so with the edge of radome avoid loudspeaker under install, can further reduce the magnetic field that produces on the circuit board to the interference of loudspeaker, further reduce the noise of loudspeaker.
In sum, the utility model head circuit plate magnetic shielding device has solved the magnetic field that the earphone internal circuit board produces in the prior art and loudspeaker has been produced the technical problem of disturbing.The utility model head circuit plate magnetic shielding device is simple in structure, has reduced inductance element on the earphone internal circuit board to the interference of loudspeaker under the limited space of earphone, has reduced the noise of loudspeaker, has improved tonequality and the quality of earphone.
Description of drawings
Fig. 1 is that the magnetic field that the earphone interior circuit board produces produces the schematic diagram that disturbs to loudspeaker;
Fig. 2 is that the utility model head circuit plate magnetic shielding device reduces the magnetic field of circuit generation in the earphone to principle and the structure chart of the interference of loudspeaker;
Among the figure: 1, loudspeaker, 2, circuit board, 3, inductance element, 4, the magnetic line of force, 5, radome.
Embodiment
Below in conjunction with drawings and Examples, further set forth the utility model.
As shown in Figure 2, a kind of head circuit plate magnetic shielding device comprises that being used between the loudspeaker 1 that are arranged on earphone and the circuit board 2 prevents the radome 5 of the magnetic interference loudspeaker 1 that the inductance element 3 on the circuit board 2 produces.
Radome 5 is the cylinder-like structure of an end opening, i.e. Yuan Xing lid-like, and the openend of radome 5 is fixed on the circuit board 2.
The area of radome is more big in theory, and thickness is more big, and its shield effectiveness is more good, but is subjected to the restriction of earphone inner space, and the area of radome can not be done very greatly.In order to guarantee good shield effectiveness, be designed to the radius of radome 5 greater than the radius of loudspeaker 1, and the edge of radome 5 is away under the loudspeaker 1, the central lines of the center line of radome 5 and loudspeaker 1 preferably, can guarantee that like this edge of radome 5 is away from loudspeaker 1, because from DISTRIBUTION OF MAGNETIC FIELD as can be known, the most magnetic line of force can be via another utmost point of getting back to magnetic field behind radome 5 water conservancy diversion, the magnetic line of force that is coupled to edge (namely position) vertical with circuit board of radome 5 is maximum, magnetic field is the strongest, so the leakage of the magnetic line of force is also more with respect to other position herein, interference to loudspeaker 1 is also more big, so adopt aforesaid way to make the edge of radome 5 away from loudspeaker 1, reduce the interference to loudspeaker 1.
Radome 5 adopts the permeability magnetic material with high permeability to make, and the material of radome 5 has great influence to the cost of its shielding properties and whole device.The Material Selection of radome 5 mainly is to select according to permeability and the magnetic saturation performance of material in the practical application, will consider the machinability of material in addition.Based on the consideration of above reason, in order to guarantee good Magnetic Shielding Effectiveness, the material of the radome 5 in the utility model is preferably permalloy 80, Mumetal(magnetically soft alloy), 48 dilvals or ULCS(ultra-low-carbon steel) etc. permeability magnetic material.
Use above-mentioned head circuit plate magnetic shielding device and realize the method for head circuit magnetic screen, may further comprise the steps:
S1, provide the radome 5 that is made by permalloy 80, Mumetal, 48 dilvals or ULCS, radome 5 is the cylinder-like structure of an end opening;
S2, with the openend secure bond of radome 5 on the circuit board 2 of earphone, the magnetic line of force 4 in the magnetic field that produces on the circuit board 2 is got back to the other end in magnetic field via radome 5, has reduced the interference to earphone horn 1;
S3, the circuit board that is combined with radome 52 that step 2 is finished are installed in the housing of earphone, and radome 5 is between the loudspeaker 1 and circuit board 2 of earphone.
In addition, radome 5 is being added man-hour, should reduce the seam on the radome 5 as far as possible, and the abutment joint place to carry out encapsulation process, reduce the air gap of seam crossing as far as possible.
The utility model is owing to adopted above-mentioned structure and method, changed the direction of the magnetic line of force 4 in the low frequency variations magnetic field that the inductance element 3 on the head circuit plate 2 produces, under the effect of radome 5, most of magnetic line of force 4 can have been got back to another utmost point in magnetic field via the radome 5 that high permeability materials make, have only a little magnetic line of force to penetrate radome 5 and be coupled to loudspeaker 1, thereby reduced magnetic field that the inductance element 3 on the circuit board 2 produces greatly to the interference of loudspeaker 1, and then reduced loudspeaker 1 because disturbing the noise that produces.Select for use the ULCS of 0.5mm to make radome 5 and be installed between loudspeaker 1 and the circuit board 2, test records inhibition level to the noise of loudspeaker 1 more than 10db.As seen the utility model has reduced the magnetic field of generation on the circuit board 2 greatly to the interference of loudspeaker 1, has reduced the noise of loudspeaker 1, has improved tonequality and the quality of earphone.
The utility model is not limited to above-mentioned concrete execution mode, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done all drop within the protection range of the present utility model.
Claims (5)
1. head circuit plate magnetic shielding device, it is characterized in that, comprise that being used between the loudspeaker that are arranged on described earphone and the circuit board prevent the radome of the described loudspeaker of magnetic interference that the inductance element on the described circuit board produces, the openend of described radome is incorporated on the described circuit board; Described radome adopts permeability magnetic material to make.
2. head circuit plate magnetic shielding device according to claim 1 is characterized in that, described radome is the cylinder-like structure of an end opening.
3. head circuit plate magnetic shielding device according to claim 2 is characterized in that, the radius of described radome is greater than the radius of described loudspeaker, and the edge of described radome is away under the described loudspeaker.
4. head circuit plate magnetic shielding device according to claim 3 is characterized in that, the center line of described radome and the central lines of described loudspeaker.
5. according to the described head circuit plate of each claim of claim 1 to 4 magnetic shielding device, it is characterized in that described permeability magnetic material is permalloy 80, Mumetal, 48 dilvals or ULCS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320056581 CN203039883U (en) | 2013-01-31 | 2013-01-31 | Magnetic shielding device for earphone circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320056581 CN203039883U (en) | 2013-01-31 | 2013-01-31 | Magnetic shielding device for earphone circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203039883U true CN203039883U (en) | 2013-07-03 |
Family
ID=48691967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320056581 Expired - Lifetime CN203039883U (en) | 2013-01-31 | 2013-01-31 | Magnetic shielding device for earphone circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203039883U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103096214A (en) * | 2013-01-31 | 2013-05-08 | 青岛歌尔声学科技有限公司 | Magnetic shielding device and magnetic shielding method of earphone circuit board |
-
2013
- 2013-01-31 CN CN 201320056581 patent/CN203039883U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103096214A (en) * | 2013-01-31 | 2013-05-08 | 青岛歌尔声学科技有限公司 | Magnetic shielding device and magnetic shielding method of earphone circuit board |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |