CN203734833U - High and low pitch common magnetic circuit loudspeaker - Google Patents
High and low pitch common magnetic circuit loudspeaker Download PDFInfo
- Publication number
- CN203734833U CN203734833U CN201420048132.7U CN201420048132U CN203734833U CN 203734833 U CN203734833 U CN 203734833U CN 201420048132 U CN201420048132 U CN 201420048132U CN 203734833 U CN203734833 U CN 203734833U
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- magnetic
- voice coil
- bass
- loudspeaker
- gap
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 4
- 210000002421 cell wall Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 235000021167 banquet Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The utility model discloses a high and low pitch common magnetic circuit loudspeaker. The loudspeaker comprises an annular magnet, a high pitch voice coil, a low pitch voice coil, a magnetic conductive assembly and a magnetic conductive column. The annular magnet sleeves the magnetic conductive column. The magnetic conductive assembly sleeves the annular magnet. The magnetic conductive assembly is provided with a high pitch magnetic gap and a low pitch magnetic gap. One end of the magnetic conductive column is located in the high pitch magnetic gap. The high pitch voice coil is arranged in the high pitch magnetic gap and is located between the magnetic conductive assembly and the magnetic conductive column. The low pitch voice coil is arranged in the low pitch magnetic gap. The annular magnet is located between an annular surface formed by the high pitch voice coil and an annular surface formed by the low pitch voice coil. The high pitch voice coil and the low pitch voice coil share one annular magnet so that one loudspeaker simultaneously possesses characteristics of a high pitch loudspeaker and a low pitch loudspeaker. Applicability of the loudspeaker is increased and magnet cost is saved.
Description
Technical field
The utility model relates to speaker unit technical field, particularly relates to a kind of high bass and shares magnetic circuit loudspeaker.
Background technology
Loud speaker is usually used in the occasions such as media product, automobile, stage, banquet hall, and the signal of telecommunication of input is converted into corresponding audio signal output, the good and bad quality that directly determines tonequality of performance of loud speaker.
Loud speaker is divided into high, medium and low sound loud speaker, and every kind of loud speaker has the corresponding occasion of quoting, and corresponding structure is also different, and traditional loudspeaker function is single, and adaptability is poor, has caused inconvenience to user's use.
Summary of the invention
The purpose of this utility model is to provide a kind of high bass that can simultaneously possess high and low sound loud speaker feature to share magnetic circuit loudspeaker.
In order to realize the purpose of this utility model, the technical scheme of taking is:
A kind of high bass shares magnetic circuit loudspeaker, comprise annular magnet, high pitch voice coil loudspeaker voice coil, bass voice coil loudspeaker voice coil, magnetic conduction subassembly, conducting magnetic column, annular magnet is sheathed on outside conducting magnetic column, magnetic conduction subassembly is sheathed on outside annular magnet, magnetic conduction subassembly is provided with high pitch magnetic gap and bass magnetic gap, conducting magnetic column one end is positioned at high pitch magnetic gap, high pitch voice coil loudspeaker voice coil is located in high pitch magnetic gap, and between magnetic conduction subassembly and conducting magnetic column, bass voice coil loudspeaker voice coil is located in bass magnetic gap, between the ring surface that the ring surface that annular magnet forms at high pitch voice coil loudspeaker voice coil and bass voice coil loudspeaker voice coil form.
The magnetic field of high pitch voice coil loudspeaker voice coil is got back to again annular magnet from annular magnet after conducting magnetic column, high pitch voice coil loudspeaker voice coil, magnetic conduction subassembly, annular magnet uses as the outer magnetic design of high pitch, the magnetic field of bass voice coil loudspeaker voice coil is got back to again annular magnet from annular magnet after magnetic conduction subassembly, bass sound magnetic conduction subassembly, conducting magnetic column, annular magnet uses as the interior magnetic design of bass, high pitch voice coil loudspeaker voice coil and bass voice coil loudspeaker voice coil share same annular magnet, make same loud speaker possess the feature of high pitch loudspeaker and woofer simultaneously, improve the applicability of loud speaker, and saved the cost of magnet.
Below technical scheme is further illustrated:
Preferably, described magnetic conduction subassembly comprises horizontal magnetic conduction portion and longitudinal magnetic conduction portion, and described annular magnet is positioned at horizontal magnetic conduction portion and the region that longitudinally magnetic conduction portion surrounds, and described high pitch magnetic gap, bass magnetic gap are arranged at horizontal magnetic conduction portion.The magnetic field producing due to annular magnet can, in whole space divergence, by horizontal magnetic conduction portion and the longitudinally magnetic conduction portion acting in conjunction of magnetic conduction subassembly, can make magnetic field form closed magnetic circuit in corresponding position.
Preferably, described horizontal magnetic conduction portion is with longitudinally magnetic conduction portion is one-body molded.Adopt in this way, simple in structure, easy to use.
Preferably, described horizontal magnetic conduction portion and longitudinally magnetic conduction portion removably connect.Adopt in this way, simple in structure, easy to use.
Preferably, described horizontal magnetic conduction portion comprises bass magnetic guiding loop and washer, and washer is positioned at bass magnetic guiding loop, between washer outer ring and bass magnetic guiding loop inner ring, forms described bass magnetic gap, washer is sheathed on outside conducting magnetic column, forms high pitch magnetic gap between washer inner ring and conducting magnetic column.Washer, for high pitch voice coil loudspeaker voice coil provides uniform magnetic field, makes loud speaker high pitch part possess higher sensitivity and lower distortion.Thereby reach better acoustical quality, bass magnetic guiding loop, for bass voice coil loudspeaker voice coil provides uniform magnetic field, makes loud speaker bass part possess higher sensitivity and lower distortion, thereby makes bass part reach better acoustical quality.
Preferably, the quantity of described bass magnetic guiding loop is one.
Preferably, the quantity of described bass magnetic guiding loop is two or more, bass magnetic guiding loop is not of uniform size causes for each, large bass magnetic guiding loop be sheathed on its size immediate little bass magnetic guiding loop outside, between adjacent bass magnetic guiding loop, form gap, voice coil loudspeaker voice coil is set in gap, longitudinal magnetic conduction portion is set between adjacent voice coil loudspeaker voice coil.Bass magnetic guiding loop quantity can be two or more, and each to there being the closed magnetic circuit of oneself, thereby makes same loud speaker possess a greater variety of tonequality, and shares same annular magnet, provides cost savings.
Preferably, high bass shares magnetic circuit loudspeaker and also comprises magnetic conductance seat, and magnetic conductance seat is sheathed on outside conducting magnetic column, and the lower surface of touching annular magnet is pasted in magnetic conductance seat upper surface.Magnetic conductance seat further carries out magnetic conduction.
Preferably, described high pitch magnetic gap and bass magnetic gap are positioned at the same side of described conducting magnetic column.In the time that high pitch magnetic gap and bass magnetic gap are positioned at conducting magnetic column the same side, possesses good effect.
Preferably, described high pitch magnetic gap and bass magnetic gap are positioned at same plane.During by loud speaker transverse cross sectional, can switch to high pitch magnetic gap in bass magnetic gap position, high and low sound magnetic gap is positioned at same plane, can make loud speaker possess the effect of point sound source simultaneously.
Preferably, high bass shares magnetic circuit loudspeaker and also comprises high sound diaphragm, low sound diaphragm, described high pitch voice coil loudspeaker voice coil one end high sound diaphragm of conflicting, described bass voice coil loudspeaker voice coil one end low sound diaphragm of conflicting.
Preferably, high bass shares magnetic circuit loudspeaker and also comprises support, Megaphone, Megaphone is connected in support, and Megaphone position is corresponding with high sound diaphragm, and is arranged on high sound diaphragm outside, described bass diaphragm arrangement is in Megaphone outside, low sound diaphragm comprises osculum end and big opening end, low sound diaphragm osculum end conflict bass voice coil loudspeaker voice coil, and big opening end is fixed on support, described conducting magnetic column is T iron, and described high sound diaphragm, low sound diaphragm, T iron, high pitch voice coil loudspeaker voice coil, bass voice coil loudspeaker voice coil, annular magnet are all coaxial.High bass voice coil loudspeaker voice coil, diaphragm etc. are all coaxial, and diaphragm is at same surface radiation sound wave, thereby make loud speaker play the effect of point sound source.
Preferably, described longitudinal magnetic conduction portion and conducting magnetic column are one-body molded.Adopt this structure, easier for installation, quick.
Preferably, described support is provided with location notch, and described horizontal magnetic conduction is deployed in described location notch.Location notch is set, can faster magnetic conduction subassembly be placed in location notch, by location notch cell wall, magnetic conduction subassembly is played to positioning action.
The utility model has the advantages that:
The magnetic field of high pitch voice coil loudspeaker voice coil is got back to again annular magnet from annular magnet after conducting magnetic column, high pitch voice coil loudspeaker voice coil, magnetic conduction subassembly, annular magnet uses as the outer magnetic design of high pitch, the magnetic field of bass voice coil loudspeaker voice coil is got back to again annular magnet from annular magnet after magnetic conduction subassembly, bass sound magnetic conduction subassembly, conducting magnetic column, annular magnet uses as the interior magnetic design of bass, high pitch voice coil loudspeaker voice coil and bass voice coil loudspeaker voice coil share same annular magnet, make same loud speaker possess the feature of high pitch loudspeaker and woofer simultaneously, improve the applicability of loud speaker, and saved the cost of magnet.
Brief description of the drawings
Fig. 1 is that the high bass of the utility model shares the schematic diagram one in magnetic circuit loudspeaker embodiment 1;
Fig. 2 partly cuts open figure in Fig. 1;
Fig. 3 is the I partial enlarged drawing in Fig. 2;
Fig. 4 is that the high bass of the utility model shares the schematic diagram two in magnetic circuit loudspeaker embodiment 1;
Fig. 5 is that the high bass of the utility model shares and partly cuts open figure in magnetic circuit loudspeaker embodiment 2;
Fig. 6 is that the high bass of the utility model shares the front view in magnetic circuit loudspeaker embodiment 2.
100. annular magnets, 201. high pitch voice coil loudspeaker voice coils, 202. bass voice coil loudspeaker voice coils, 301. horizontal magnetic conduction portions, 311. bass magnetic guiding loops, 312. washers, 322. cable-through holes, 302. longitudinal magnetic conduction portions, 400. conducting magnetic columns, 501. high pitch magnetic gap, 502. bass magnetic gap, 600. magnetic conductance seats, 701. high sound diaphragms, 702. low sound diaphragms, 801. supports, 811. location notch cell walls, 802. Megaphones, 803. play ripple.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated:
Embodiment 1:
As Figure 1-4, in embodiment of the present utility model, a kind of high bass shares magnetic circuit loudspeaker, comprise annular magnet 100, high pitch voice coil loudspeaker voice coil 201, bass voice coil loudspeaker voice coil 202, magnetic conduction subassembly, conducting magnetic column 400, annular magnet 100 is sheathed on outside conducting magnetic column 400, magnetic conduction subassembly is sheathed on outside annular magnet 100, magnetic conduction subassembly is provided with high pitch magnetic gap 501 and bass magnetic gap 502, conducting magnetic column 400 one end are positioned at high pitch magnetic gap 501, high pitch voice coil loudspeaker voice coil 201 is located in high pitch magnetic gap 501, and between magnetic conduction subassembly and conducting magnetic column 400, bass voice coil loudspeaker voice coil 202 is located in bass magnetic gap 502, between the ring surface that the ring surface that annular magnet 100 forms at high pitch voice coil loudspeaker voice coil 201 and bass voice coil loudspeaker voice coil 202 form.
The magnetic field of high pitch voice coil loudspeaker voice coil 201 from annular magnet 100 through conducting magnetic column 400, high pitch voice coil loudspeaker voice coil 201, after magnetic conduction subassembly, get back to again annular magnet 100, annular magnet 100 uses as the outer magnetic of high pitch voice coil loudspeaker voice coil 201, the magnetic field of bass voice coil loudspeaker voice coil 202 from annular magnet 100 through magnetic conduction subassembly, bass sound magnetic conduction subassembly, after conducting magnetic column 400, get back to again annular magnet 100, annular magnet 100 uses as the interior magnetic of bass voice coil loudspeaker voice coil 202, high pitch voice coil loudspeaker voice coil 201 and bass voice coil loudspeaker voice coil 202 share same annular magnet 100, make same loud speaker possess the feature of high pitch loudspeaker and woofer simultaneously, improve the applicability of loud speaker, and save the cost of magnet.
Described magnetic conduction subassembly comprises horizontal magnetic conduction portion 301 and longitudinal magnetic conduction portion 302, and described annular magnet 100 is positioned at horizontal magnetic conduction portion 301 and the region that longitudinally magnetic conduction portion 302 surrounds, and described high pitch magnetic gap 501, bass magnetic gap 502 are arranged at horizontal magnetic conduction portion 301.The magnetic field producing due to annular magnet 100 can, in whole space divergence, by horizontal magnetic conduction portion 301 and longitudinally magnetic conduction portion 302 actings in conjunction of magnetic conduction subassembly, can make magnetic field form closed magnetic circuit in corresponding position.
Described horizontal magnetic conduction portion 301 is with longitudinally magnetic conduction portion 302 is one-body molded.Adopt in this way, simple in structure, easy to use.
In the present embodiment, described horizontal magnetic conduction portion 301 and longitudinally magnetic conduction portion 302 removably connect.Adopt in this way, simple in structure, easy to use.In other embodiments, can also be that described horizontal magnetic conduction portion 301 is with longitudinally magnetic conduction portion 302 is one-body molded.
Described horizontal magnetic conduction portion 301 comprises bass magnetic guiding loop 311 and washer 312, washer 312 is positioned at bass magnetic guiding loop 311, between washer 312 outer rings and bass magnetic guiding loop 311 inner rings, form described bass magnetic gap 502, washer 312 is sheathed on outside conducting magnetic column 400, between washer 312 inner rings and conducting magnetic column 400, forms high pitch magnetic gap 501.Washer 312, for high pitch voice coil loudspeaker voice coil 201 provides uniform magnetic field, makes loud speaker high pitch part possess higher sensitivity and lower distortion.Thereby reach better acoustical quality, bass magnetic guiding loop 311, for bass voice coil loudspeaker voice coil 202 provides uniform magnetic field, makes loud speaker bass part possess higher sensitivity and lower distortion, thereby makes bass part reach better acoustical quality.
On described washer 312, have cable-through hole 322, cable-through hole 322 quantity are two, and two cable-through holes 322 lay respectively at washer 312 both sides.
In the present embodiment, the quantity of described bass magnetic guiding loop 311 is one.In other embodiments, the quantity of described bass magnetic guiding loop 311 is two or more, bass magnetic guiding loop 311 is not of uniform size causes for each, large bass magnetic guiding loop 311 be sheathed on its size immediate little bass magnetic guiding loop 311 outside, between adjacent bass magnetic guiding loop 311, form gap, voice coil loudspeaker voice coil is set in gap, longitudinal magnetic conduction portion 302 is set between adjacent voice coil loudspeaker voice coil.Bass magnetic guiding loop 311 quantity can be two or more, and each to there being the closed magnetic circuit of oneself, thereby make same loud speaker possess a greater variety of tonequality, and share same annular magnet 100, provide cost savings.
High bass shares magnetic circuit loudspeaker and also comprises magnetic conductance seat 600, and magnetic conductance seat 600 is sheathed on outside conducting magnetic column 400, and the lower surface of touching annular magnet 100 is pasted in magnetic conductance seat 600 upper surfaces.Magnetic conductance seat 600 further carries out magnetic conduction.
In the present embodiment, described high pitch magnetic gap 501 and bass magnetic gap 502 are positioned at the same side of described conducting magnetic column 400.In the time that high pitch magnetic gap 501 and bass magnetic gap 502 are positioned at conducting magnetic column 400 the same side, possesses good effect.And effect is better in the time that described high pitch magnetic gap 501 and bass magnetic gap 502 are positioned at same plane.During by loud speaker transverse cross sectional, can switch to high pitch magnetic gap 501 in bass magnetic gap 502 positions, high and low sound magnetic gap is positioned at same plane, can make loud speaker possess the effect of point sound source simultaneously.In other embodiments, described high pitch magnetic gap 501 and bass magnetic gap 502 can also lay respectively at the not homonymy of described conducting magnetic column 400.
High bass shares magnetic circuit loudspeaker and also comprises high sound diaphragm 701, low sound diaphragm 702, described high pitch voice coil loudspeaker voice coil 201 one end high sound diaphragm 701 of conflicting, described bass voice coil loudspeaker voice coil 202 one end low sound diaphragm 702 of conflicting.
High bass shares magnetic circuit loudspeaker and also comprises support 801, Megaphone 802, Megaphone 802 is connected in support 801, Megaphone 802 positions are corresponding with high sound diaphragm 701, and be arranged on high sound diaphragm 701 outsides, described low sound diaphragm 702 is arranged at Megaphone 802 outsides, low sound diaphragm 702 comprises osculum end and big opening end, low sound diaphragm 702 osculum end conflict bass voice coil loudspeaker voice coils 202, big opening end is fixed on support 801, described conducting magnetic column 400 is T iron, described high sound diaphragm 701, low sound diaphragm 702, T iron, high pitch voice coil loudspeaker voice coil 201, bass voice coil loudspeaker voice coil 202, annular magnet 100 is all coaxial, in support 801, be also connected with and play ripple 803.High bass voice coil loudspeaker voice coil 202, diaphragm etc. are all coaxial, and diaphragm is at same surface radiation sound wave, thereby make loud speaker play the effect of point sound source.
Embodiment 2:
As shown in Figure 5,6, the difference technical characterictic of the present embodiment and embodiment 1 is, described longitudinal magnetic conduction portion 302 is one-body molded with conducting magnetic column 400, and conducting magnetic column 400 mid portions in the present embodiment adopt solid.Adopt this structure, easier for installation, quick.
Described support 801 is provided with location notch, and described horizontal magnetic conduction portion 301 is placed in described location notch.Location notch is set, can faster magnetic conduction subassembly be placed in location notch, by location notch cell wall 811, magnetic conduction subassembly is played to positioning action.
In the present embodiment, the cross section of described Megaphone 802 is parabola shaped.Adopt the Megaphone 802 of this shape, sound transmission can better be gone out, reach better effect.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be noted that; for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement; as the part-structure in the present embodiment 1, embodiment 2 is combined to use, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. a high bass shares magnetic circuit loudspeaker, it is characterized in that, comprise annular magnet, high pitch voice coil loudspeaker voice coil, bass voice coil loudspeaker voice coil, magnetic conduction subassembly, conducting magnetic column, annular magnet is sheathed on outside conducting magnetic column, magnetic conduction subassembly is sheathed on outside annular magnet, magnetic conduction subassembly is provided with high pitch magnetic gap and bass magnetic gap, conducting magnetic column one end is positioned at high pitch magnetic gap, high pitch voice coil loudspeaker voice coil is located in high pitch magnetic gap, and between magnetic conduction subassembly and conducting magnetic column, bass voice coil loudspeaker voice coil is located in bass magnetic gap, between the ring surface that the ring surface that annular magnet forms at high pitch voice coil loudspeaker voice coil and bass voice coil loudspeaker voice coil form.
2. high bass according to claim 1 shares magnetic circuit loudspeaker, it is characterized in that, described magnetic conduction subassembly comprises horizontal magnetic conduction portion and longitudinal magnetic conduction portion, described annular magnet is positioned at horizontal magnetic conduction portion and the region that longitudinally magnetic conduction portion surrounds, and described high pitch magnetic gap, bass magnetic gap are arranged at horizontal magnetic conduction portion.
3. high bass according to claim 2 shares magnetic circuit loudspeaker, it is characterized in that, described horizontal magnetic conduction portion is with longitudinally magnetic conduction portion is one-body molded.
4. high bass according to claim 2 shares magnetic circuit loudspeaker, it is characterized in that, described horizontal magnetic conduction portion and longitudinally magnetic conduction portion removably connect.
5. high bass according to claim 4 shares magnetic circuit loudspeaker, it is characterized in that, described horizontal magnetic conduction portion comprises bass magnetic guiding loop and washer, washer is positioned at bass magnetic guiding loop, between washer outer ring and bass magnetic guiding loop inner ring, form described bass magnetic gap, washer is sheathed on outside conducting magnetic column, forms high pitch magnetic gap between washer inner ring and conducting magnetic column.
6. high bass according to claim 5 shares magnetic circuit loudspeaker, it is characterized in that, the quantity of described bass magnetic guiding loop is one.
7. high bass according to claim 5 shares magnetic circuit loudspeaker, it is characterized in that, the quantity of described bass magnetic guiding loop is two or more, bass magnetic guiding loop is not of uniform size causes for each, large bass magnetic guiding loop be sheathed on its size immediate little bass magnetic guiding loop outside, between adjacent bass magnetic guiding loop, form gap, voice coil loudspeaker voice coil is set in gap, longitudinal magnetic conduction portion is set between adjacent voice coil loudspeaker voice coil.
8. share magnetic circuit loudspeaker according to the high bass described in claim 1-7 any one, it is characterized in that, also comprise that magnetic conductance seat, magnetic conductance seat are sheathed on outside conducting magnetic column, the lower surface of touching annular magnet is pasted in magnetic conductance seat upper surface.
9. share magnetic circuit loudspeaker according to the high bass described in claim 1-7 any one, it is characterized in that, described high pitch magnetic gap and bass magnetic gap are positioned at the same side of described conducting magnetic column.
10. high bass according to claim 9 shares magnetic circuit loudspeaker, it is characterized in that, also comprise high sound diaphragm, low sound diaphragm, support, Megaphone, described high pitch voice coil loudspeaker voice coil one end high sound diaphragm of conflicting, described bass voice coil loudspeaker voice coil one end low sound diaphragm of conflicting, Megaphone position is corresponding with high sound diaphragm, and be arranged on outside high sound diaphragm, described bass diaphragm arrangement is in Megaphone outside, low sound diaphragm comprises osculum end and big opening end, low sound diaphragm osculum end conflict bass voice coil loudspeaker voice coil, big opening end is fixed on support, described conducting magnetic column is T iron, described high sound diaphragm, low sound diaphragm, T iron, high pitch voice coil loudspeaker voice coil, bass voice coil loudspeaker voice coil, annular magnet is all coaxial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420048132.7U CN203734833U (en) | 2014-01-24 | 2014-01-24 | High and low pitch common magnetic circuit loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420048132.7U CN203734833U (en) | 2014-01-24 | 2014-01-24 | High and low pitch common magnetic circuit loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203734833U true CN203734833U (en) | 2014-07-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420048132.7U Expired - Lifetime CN203734833U (en) | 2014-01-24 | 2014-01-24 | High and low pitch common magnetic circuit loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203734833U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107333215A (en) * | 2017-08-30 | 2017-11-07 | 钟礼通 | Magnetic circuit system and concentric shafts loudspeaker |
-
2014
- 2014-01-24 CN CN201420048132.7U patent/CN203734833U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107333215A (en) * | 2017-08-30 | 2017-11-07 | 钟礼通 | Magnetic circuit system and concentric shafts loudspeaker |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140723 |
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| CX01 | Expiry of patent term |