CN103856875B - A kind of external magnetic circuit structure-improved - Google Patents
A kind of external magnetic circuit structure-improved Download PDFInfo
- Publication number
- CN103856875B CN103856875B CN201410091069.XA CN201410091069A CN103856875B CN 103856875 B CN103856875 B CN 103856875B CN 201410091069 A CN201410091069 A CN 201410091069A CN 103856875 B CN103856875 B CN 103856875B
- Authority
- CN
- China
- Prior art keywords
- magnetic
- magnetite
- iron core
- compound
- circuit structure
- 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
Links
Landscapes
- Hard Magnetic Materials (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The present invention discloses a kind of external magnetic circuit structure-improved, including an iron core, at least one compound magnetite is same to be located in the iron core outside, the magnetic direction substantial orthogonality of the compound magnetic pole of magnetite two, and the magnetic direction of a wherein magnetic pole points to the iron core, it is also arranged at another magnetic pole of compound magnetite including magnetic conductive board and a magnetic gap is kept between the iron core.Thus, compound magnetite can provide higher magnetic induction intensity under limited volumetric constraint, and need not additionally set magnetic conduction heel piece, be therefore particularly suitable for the loudspeaker of small size, can increase sensitivity and export performance to related sound.
Description
Technical field
The present invention relates to loudspeaker field, particularly a kind of external magnetic circuit structure-improved.
Background technology
Loudspeaker can divide into electrodynamic type (Dynamic Type), electromagnetic type with the difference of energy conversion regime
The types such as (Electromagnetic Type) and condenser type (Electric Condenser Type), wherein electrodynamic type is raised one's voice
Device is also known as moving-coil type (Moving Coil Type) loudspeaker, mainly use the magnetic structures of inside loudspeakers and voice coil loudspeaker voice coil it
Between electromagnetic induction drive vibrating diaphragm to produce vibrations, magnetite in magnetic structure need for voice coil vibrations provide one it is uniform and stable
Magnetic field, is indispensable critical part.
Furthermore, it is understood that in the magnetic structure of inside loudspeakers can be divided into according to magnetite position set in magnetic circuit
Two kinds of magnetic-type and external magnetic type, when the volume of loudspeaker is less than to a certain degree, because the difficulty in magnetite manufacture, it will usually use instead
The magnetic structure of external magnetic type, referring to Fig. 1, the magnetic structure 1 of as a kind of external magnetic type, it includes a magnetic conduction heel piece 2, and it has
There are a flat part 2a and a core 2b to be convexly equipped in flat part 2a inside top surface, make the L-shaped cross-section of magnetic conduction heel piece 2；One permanent
Magnet 3 is arranged on the outside of flat part 2a top surface；And a magnetic conductive board 4 is located at the top surface of permanent magnet 3 and protected with core 2b
Hold a magnetic gap 5.Wherein, two magnetic poles of permanet magnet 3 be distributed across two ends and in face of the flat part 2a and magnetic conduction of magnetic conduction heel piece 2
Plate 4, it is in uniform magnetic field that the magnetic line of force thereby is directed into shape among magnetic gap 5.In order to maintain enough magnetic induction intensity, permanent magnetic
Stone 3 will occupy certain volume, and easily occur the problem of magnetic force is leaked, thus hinder the compact in size of loudspeaker with
Sound output performance, still there is improvement space.
The content of the invention
It is an object of the invention to provide a kind of field homogeneity stabilization and the high external magnetic circuit structure-improved of magnetic induction intensity.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：A kind of external magnetic circuit structure-improved, including：
One iron core；
At least one compound magnetite, with being located on the outside of the iron core, the magnetic direction of the compound magnetic pole of magnetite two is real
It is vertical in matter, and the magnetic direction of one of magnetic pole points to the iron core；
And a magnetic conductive board, the magnetic conductive board is arranged on another magnetic pole of the compound magnetite, and the magnetic conduction
There is a magnetic gap between plate and the iron core.
Preferably, wherein the compound magnetite is that anisotropy coheres magnetite or anisotropy powder pressure magnetite.
Preferably, wherein the iron core is cylindric.
It is further preferred that wherein the compound magnetite has ring body, the body interior is stepped and can distinguish
For a minor diameter part and a large-diameter portion, a magnetic pole of the compound magnetite is located at the medial surface of the minor diameter part, another magnetic pole then position
In the outer face of the large-diameter portion so that the magnetic conductive board is set.
Preferably, the quantity of wherein at least one compound magnetite is 1.
Preferably, the quantity of wherein at least one compound magnetite is 2, and the section of each compound magnetite is L-shaped.
Preferably, wherein the iron core does not have magnetic.
Because above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：
Due to the compound magnetite of the present invention magnetic pole in advance by orientation handle and formed two vertical pole orientations of essence with
The problem of magnetic force is leaked is avoided, then shape is enough to provide a voice coil loudspeaker voice coil in uniform magnetic field in magnetic gap with magnetic conductive board for iron core of arranging in pairs or groups
The magnetic induction intensity of intensity, in addition, compared to existing external magnetic circuit structure, the present invention simultaneously need not set magnetic conduction heel piece
Flat part, therefore be conducive to the miniaturization of loudspeaker.
Brief description of the drawings
Accompanying drawing 1 is the sectional view of existing external magnetic circuit structure；
Accompanying drawing 2 is the stereogram of the embodiment of the present invention；
Accompanying drawing 3 is the sectional view of the embodiment of the present invention；
Accompanying drawing 4 is by being directed to the magnetic induction intensity figure that magnetic gap is measured in the embodiment of the present invention；
Accompanying drawing 5 is the magnetic line of force distribution schematic diagram of the embodiment of the present invention；
The existing outer magnetic magnetic structure shown in accompanying drawing 1 of accompanying drawing 6 is directed to the magnetic induction intensity figure that magnetic gap is measured.
In the figures above：1st, magnetic structure；2nd, magnetic conduction heel piece；2a, flat part；2b, core；3rd, permanent magnet；4th, magnetic conduction
Plate；40th, magnetic conductive board；5th, magnetic gap；G, magnetic gap；10th, external magnetic circuit structure-improved；20th, iron core；30th, it is combined magnetite；31st, path
Portion；32nd, large-diameter portion；N, magnetic pole；S, magnetic pole；A, A measuring point；B, B measuring point.
Embodiment
The invention will be further described for shown embodiment below in conjunction with the accompanying drawings：
Embodiment one：Referring to shown in accompanying drawing 2,3, a kind of external magnetic circuit structure-improved, it includes the iron core of cylinder
20, with the magnetic conductive board of the annular compound magnetite 30 for being located in the outside of iron core 20, and the top end face located at compound magnetite 30
40, wherein, there is a magnetic gap G between magnetic conductive board 40 and iron core 20.
As shown in Figure 3, the body interior for being combined magnetite 30 is stepped and can divide into a minor diameter part 31 and a big footpath
Portion 32, minor diameter part 31 is then set to be sheathed on iron core 20, the outer face of large-diameter portion 32 for magnetic conductive board 40.In addition, compound magnetite
30 anisotropy to handle by orientation in advance and (namely being matched somebody with somebody with magnetic field or mechanical system and determine the direction of magnetization) coheres magnetite
(Anisotropic Bonded Magnet), that is, use rare earth permanent-magnet powder, such as rubidium iron boron（NeFeB）Or SmCo
（SmCo）Or alnico alloy (Alnico), uniformly mixed with resin, plastics or low-melting alloy cementing agent, then with compression,
Permanent-magnet materials made by extrusion or injection forming method, therefore, the present invention use the magnetic field of the compound magnetic pole of magnetite 30 2
Direction substantial orthogonality a, wherein magnetic pole (being N poles in the present embodiment) is located at the medial surface of minor diameter part 31 and with its magnetic direction
Iron core 20 is pointed to, another magnetic pole (being S poles in the present embodiment) is then pointed to positioned at the outer face of large-diameter portion 32 and with its magnetic direction
Magnetic conductive board 40, therefore the distribution of the magnetic line of force of the present embodiment is as shown in Figure 5.
Use rubidium iron boron（NeFeB）The compound magnetite 30 of previous embodiment is made in permanent-magnet powder, and actually measures the magnetic of accompanying drawing 5
A measuring points can obtain magnetic gap G centers to the magnetic induction intensity (magnetic flux density) of B measuring points in gap G
Magnetic induction intensity reaches 0.528B (Tesla), and it is distributed as shown in Figure 4, and existing external magnetic circuit as shown in Figure 1
If structure is measured in an identical manner, its Magnetic Induction Density Distribution can obtain as shown in Figure 6, the magnetic strength in its magnetic gap center
It is then 0.508B (Tesla) to answer intensity, in addition, can also find out the maximum of the embodiment of the present invention easily with accompanying drawing 6 referring to the drawings 4
Magnetic induction intensity is larger with average magnetic induction intensity, therefore it is higher to prove that the present invention has under being limited in identical space
Magnetic induction intensity.
Because the external magnetic circuit structure-improved 10 of the present invention provides higher magnetic induction intensity, therefore improvement is contributed to raise one's voice
The sensitivity of device, in addition, compound magnetite 30 is directly made internal stepped annular by the present invention, and by orientation processing,
Just magnetic conduction heel piece need not be set in magnetite bottom surface, the problem of magnetic force is leaked is not had, while also contributing to the size of loudspeaker
Miniaturization.
Remark additionally herein, above-mentioned iron core is substantially not have magnetic, and compound magnetite 30 can also change
It is made of permanent-magnet powder pressure knot mode, that is, powder pressure magnetite (Pressed Powder Magnet), as long as passing through orientation in advance
Processing.In addition, the quantity of compound magnetite 30 is not also limited with shape with the ring-type of above-described embodiment, for example, it can use two instead
The strip in individual tool L-shaped section is combined the both sides that magnetite is arranged at iron core, can equally obtain magnetic structure as shown in Figure 2,
As equivalence changes of the invention, and iron core can also have magnetic (namely magnetic core), as long as guiding magnetic force can be played
The function of line.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should all be included within the scope of the present invention.
Claims (6)
1. a kind of external magnetic circuit structure-improved, it is characterised in that including：
One iron core；
At least one compound magnetite, with being located on the outside of the iron core, the magnetic direction of the compound magnetic pole of magnetite two is vertical, and
The magnetic direction of one of magnetic pole points to the iron core；
And a magnetic conductive board, the magnetic conductive board is arranged on another magnetic pole of the compound magnetite, and the magnetic conductive board with
There is a magnetic gap between the iron core；
The wherein compound magnetite surrounds the body of annular, and the body interior is stepped so as to dividing into a minor diameter part and one
Large-diameter portion a, magnetic pole of the compound magnetite is located at the medial surface of the minor diameter part, and another magnetic pole is then positioned at the outer of the large-diameter portion
End face is set for the magnetic conductive board.
2. a kind of external magnetic circuit structure-improved according to claim 1, it is characterised in that：Wherein the compound magnetite is
Anisotropy coheres magnetite or anisotropy powder pressure magnetite.
3. a kind of external magnetic circuit structure-improved according to claim 1, it is characterised in that：Wherein the iron core is cylinder
Shape.
4. a kind of external magnetic circuit structure-improved according to claim 1, it is characterised in that：Wherein this at least one answer
The quantity for closing magnetite is 1.
5. a kind of external magnetic circuit structure-improved according to claim 1, it is characterised in that：Wherein this at least one answer
The quantity for closing magnetite is 2, and the section of each compound magnetite is in L shapes.
6. a kind of external magnetic circuit structure-improved according to claim 1, it is characterised in that：Wherein the iron core does not have
Magnetic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410091069.XA CN103856875B (en) | 2014-03-12 | 2014-03-12 | A kind of external magnetic circuit structure-improved |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410091069.XA CN103856875B (en) | 2014-03-12 | 2014-03-12 | A kind of external magnetic circuit structure-improved |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103856875A CN103856875A (en) | 2014-06-11 |
| CN103856875B true CN103856875B (en) | 2017-10-24 |
Family
ID=50864003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410091069.XA Expired - Fee Related CN103856875B (en) | 2014-03-12 | 2014-03-12 | A kind of external magnetic circuit structure-improved |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103856875B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115914953A (en) * | 2021-09-22 | 2023-04-04 | 歌尔科技有限公司 | Speaker and electronic apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5142260A (en) * | 1991-03-08 | 1992-08-25 | Harman International Industries, Incorporated | Transducer motor assembly |
| CN2552280Y (en) * | 2002-06-15 | 2003-05-21 | 袁德华 | Double-pushing type magnetic circuit device for loadspeaker |
| DE102007002065A1 (en) * | 2007-01-09 | 2008-07-10 | Bakker Holding Son B.V. | Magnet e.g. permanent magnet, device, for unlocking safety trailer at e.g. high-quality clothing article, has radial unit including opening with section tapered to end and accommodating central unit, where tapering end rests at section |
| CN101785323A (en) * | 2007-07-25 | 2010-07-21 | 松下电器产业株式会社 | Speaker and electronic apparatus using the same |
-
2014
- 2014-03-12 CN CN201410091069.XA patent/CN103856875B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5142260A (en) * | 1991-03-08 | 1992-08-25 | Harman International Industries, Incorporated | Transducer motor assembly |
| CN2552280Y (en) * | 2002-06-15 | 2003-05-21 | 袁德华 | Double-pushing type magnetic circuit device for loadspeaker |
| DE102007002065A1 (en) * | 2007-01-09 | 2008-07-10 | Bakker Holding Son B.V. | Magnet e.g. permanent magnet, device, for unlocking safety trailer at e.g. high-quality clothing article, has radial unit including opening with section tapered to end and accommodating central unit, where tapering end rests at section |
| CN101785323A (en) * | 2007-07-25 | 2010-07-21 | 松下电器产业株式会社 | Speaker and electronic apparatus using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103856875A (en) | 2014-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109068244B (en) | Electromagnetic exciter and screen sounding device | |
| JP5524184B2 (en) | Leak-free coil transducer motor assembly without iron | |
| KR101596891B1 (en) | Electromagnetic drive slim speaker | |
| Lemarquand et al. | MEMS electrodynamic loudspeakers for mobile phones | |
| WO2021109560A1 (en) | Vibration sound production device for electronic product, and electronic product | |
| CN204118999U (en) | For the motor of receiver | |
| US3798391A (en) | Movable magnet loudspeaker | |
| WO2018171060A1 (en) | Linear vibration motor | |
| CN103856875B (en) | A kind of external magnetic circuit structure-improved | |
| JP2013143667A (en) | Magnetic circuit for speaker and speaker using the same | |
| WO2021109559A1 (en) | Vibration sound production device for electronic product, and electronic product | |
| Remy et al. | Ironless and leakage free voice-coil motor made of bonded magnets | |
| Robertson et al. | Maximizing the force between two cuboid magnets | |
| KR101375978B1 (en) | High Efficient Electromagnet Slim Speaker Using Closed-Loop Magnetic Circuit | |
| KR20090003687A (en) | Micro-speaker using radially magnetized magnet | |
| CN201594909U (en) | Loudspeaker magnetic circuit and loudspeaker | |
| FI20175942A1 (en) | Transducer arrangement | |
| US9281110B2 (en) | External-magnet-type magnetic circuit | |
| CN201226595Y (en) | Moving magnetic type bone conduction audio transducer | |
| CN103052009B (en) | A kind of phonation unit eliminating gear sound influence | |
| CN105979444A (en) | Vibration exciter capable of being installed on structure | |
| CN211321502U (en) | Double-magnetic-drive loudspeaker unit | |
| EP4120694A1 (en) | Drive unit for a loudspeaker | |
| CN102547513A (en) | Voice coil voice film earphone | |
| TWI305368B (en) | A kind of period permanent magnetic circuit in ka-band klystron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20170911 Address after: 518109 Guangdong city of Shenzhen province Longhua District, Dalang Street Beauty Po No. 48 Applicant after: Merry Electronics (Shenzhen) Co., Ltd. Address before: Xiangcheng Kang Yuan Economic Development Zone in Suzhou City, Jiangsu Province, No. 800 215131 Applicant before: Merry Electronics (Suzhou) Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171024 Termination date: 20200312 |