CN109068259A - A kind of winding tool of voice coil and the winding method of voice coil - Google Patents
A kind of winding tool of voice coil and the winding method of voice coil Download PDFInfo
- Publication number
- CN109068259A CN109068259A CN201810880347.8A CN201810880347A CN109068259A CN 109068259 A CN109068259 A CN 109068259A CN 201810880347 A CN201810880347 A CN 201810880347A CN 109068259 A CN109068259 A CN 109068259A
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- voice coil
- plate
- wire guide
- guide plate
- coiling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
- H04R2231/003—Manufacturing aspects of the outer suspension of loudspeaker or microphone diaphragms or of their connecting aspects to said diaphragms
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Coil Winding Methods And Apparatuses (AREA)
Abstract
The present embodiments relate to electroacoustic conversion arts, disclose a kind of winding tool of voice coil, it include: to compress plate, compress wire guide plate that plate is oppositely arranged with described and be rotatably penetrated and arranged in the wire guide plate and mandrel for winding voice coil coiling, the wire guide plate can compress plate and can compress plate close to described to compress the voice coil coiling on the axial direction of the mandrel far from described.The winding tool of voice coil provided by the invention and the winding method of voice coil, can be improved the reliability of voice coil.
Description
Technical field
The present embodiments relate to electroacoustic conversion art, in particular to the coiling of the winding tool and voice coil of a kind of voice coil
Method.
Background technique
With the fast development of electronic information technology, more and more microphone devices are applied in each electronic product, especially
It is the mobile communication equipment of widely people's application, and microphone device is the important acoustic element of mobile communication equipment, for completing
Conversion between electric signal and voice signal is a kind of energy conversion device.Acoustical generator generally includes shell and is housed in shell
Interior vibrational system and magnetic circuit system, vibrational system generally include vibrating diaphragm and voice coil.Voice coil by voice coil line voice coil coiling work
It loads onto coiling to form, wherein the winding tool of voice coil is usually columnar basic tooling.
At least there are the following problems in the prior art for inventor's discovery: the columnar basic tooling coiling voice coil of use is being incited somebody to action
When being equipped with the sounding monomer of the voice coil and doing reliability test, often occur the failure bad phenomenon such as dissipating circle, fall voice coil, voice coil
Reliability is bad, and therefore, it is necessary to study a kind of winding tools of voice coil with new construction to solve the above problems.
Summary of the invention
A kind of winding tool for being designed to provide voice coil of embodiment of the present invention and the winding method of voice coil, can
Improve the reliability of voice coil.
In order to solve the above technical problems, embodiments of the present invention provide a kind of winding tool of voice coil, comprising: compress
Plate, with it is described compress wire guide plate that plate is oppositely arranged and be rotatably penetrated and arranged in the wire guide plate and for wind voice coil around
The mandrel of line, the wire guide plate on the axial direction of the mandrel can far from it is described compress plate and can close to it is described compress plate with
Compress the voice coil coiling.
Embodiment of the present invention additionally provides a kind of winding method of voice coil, comprising the following steps: S0: providing above-mentioned sound
The winding tool of circle, it is in the initial state, described to compress plate and wire guide plate fitting；S1: the first layer of coiling voice coil, it is described
First layer is the layer on the inside of voice coil；S2: the successively second layer of coiling voice coil to the last layer, the last layer are on the outside of voice coil
Layer；Wherein, step S1 includes following sub-step: S11: voice coil coiling is fixed on the mandrel；S12: the core is controlled
Axis rotation 1, which encloses while controlling the wire guide plate, compresses the first pre-determined distance of plate far from described on the axial direction of the mandrel；
S13: it controls the wire guide plate and compresses the second pre-determined distance of plate close to described on the axial direction of the mandrel, described second is pre-
If distance is less than first pre-determined distance, when the non-coiling of the last lap of first layer, return step S12；S14: first layer
Last lap coiling after the completion of, controlling the wire guide plate, to compress plate third pre- close to described on the axial direction of the mandrel
If distance；Step S2 controls the wire guide plate in the mandrel the following steps are included: after the completion of each layer of last lap coiling
Axial direction on close to described compress the 4th pre-determined distance of plate；4th pre-determined distance is greater than third pre-determined distance.
Embodiment of the present invention is rotatably penetrated and arranged in the conducting wire in terms of existing technologies, by the mandrel
Plate, enable voice coil line with mandrel rotation coiling on the mandrel, since the wire guide plate is in the axis of the mandrel
Plate can be compressed far from described on direction, the coiling so as in the rotation process of mandrel be the voice coil line reserves sky
Between, simultaneously as the wire guide plate can compress plate close to described on the axial direction of the mandrel, the wire guide plate with it is described
It compresses plate to be oppositely arranged, the wire guide plate and the low pressure plate is enabled to squeeze the voice coil line from the two sides of voice coil line, from
And reduce the gap in voice coil height, improve the arrangement tightness degree between voice coil line, and then effectively reduce and dissipate circle, fall voice coil etc.
Bad phenomenon improves the reliability of voice coil.
In addition, the mandrel is rotatably arranged in described compress in plate.
In addition, the mandrel is telescopically arranged in the wire guide plate.
In addition, being provided with through-hole on the wire guide plate, the mandrel is arranged in the through-hole and the clear size of opening is small
In the Outside Dimensions of the voice coil.So set, structure is simple, and it is easy to process, there is cost advantage.
In addition, being provided with the metallic channel for guiding the voice coil coiling on the wire guide plate.So set, being conducive to sound
The coiling of astragal, so as to improve finished product yield.
In addition, the wire guide plate is arranged in close to the side for compressing plate in the metallic channel.So set, further having
Conducive to the coiling of voice coil line, to further increase finished product yield.
In addition, the winding tool of the voice coil coiling further include: for control the wire guide plate it is separate/compress close to described
The controller of plate, the controller and the wire guide plate are electrically connected.
In addition, the winding tool of the voice coil coiling further include: for detecting the displacement of the shift length of the wire guide plate
Sensor, institute's displacement sensors and the controller are electrically connected.
In addition, first pre-determined distance is the line footpath of the voice coil coiling.So set, it is mobile to can be avoided wire guide plate
Excessive distance and the waste for causing electric energy, save cost.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the explosive view of the winding tool for the voice coil that first embodiment of the invention provides；
Fig. 2 is the schematic perspective view of the winding tool for the voice coil that first embodiment of the invention provides；
Fig. 3 is the schematic diagram of the section structure of the winding tool for the voice coil that first embodiment of the invention provides；
Fig. 4 is the schematic diagram for the voice coil winding tool that first embodiment of the invention provides；
Fig. 5 is the schematic perspective view of the winding tool for the voice coil that second embodiment of the invention provides；
Fig. 6 is the partial enlarged view in Fig. 5 at A；
Fig. 7 is the general flow chart of the winding method for the voice coil that third embodiment of the invention provides；
Fig. 8 is the sub-step flow chart of the step S1 of the winding method for the voice coil that third embodiment of the invention provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention
In formula, many technical details are proposed in order to make reader more fully understand the present invention.But even if without these technical details
And various changes and modifications based on the following respective embodiments, claimed technical solution of the invention also may be implemented.
The first embodiment of the present invention is related to a kind of winding tools 100 of voice coil, as shown in Figures 1 to 4, comprising: compress
Plate 11, with compress wire guide plate 12 that plate 11 is oppositely arranged and be rotatably penetrated and arranged in wire guide plate 12 and for wind voice coil around
The mandrel 13 of line, wire guide plate 12 separate can compress plate 11 on the axial direction of mandrel 13 and close can compress plate 11 to compress sound
Enclose coiling.
Embodiment of the present invention is rotatably penetrated and arranged in wire guide plate 12 in terms of existing technologies, by mandrel 13, makes
Obtaining voice coil line can be wound on mandrel 13 with the rotation of mandrel 13, since wire guide plate 12 can on the axial direction of mandrel 13
Far from plate 11 is compressed, so as to reserve space for the coiling of voice coil line, simultaneously as axial direction of the wire guide plate 12 in mandrel 13
Can be close to compressing plate 11 on direction, wire guide plate 12 is oppositely arranged with plate 11 is compressed, enable wire guide plate 12 with compress plate 11 from
The two sides of voice coil line compress voice coil line, to reduce the gap in voice coil height, improve the bonding dynamics between voice coil line, in turn
It effectively reduces and dissipates circle, falls the bad phenomenons such as voice coil, improve the reliability of voice coil and the loudspeaker comprising the voice coil.
In present embodiment, mandrel 13, which is rotatably arranged in, to be compressed in plate 11.Specifically, compressing plate 11 is interior step
Structure, including the first barrel 111 close to wire guide plate 12 and the second barrel 112 being connected with the first barrel 111, mandrel receiving
In in the first barrel 111 and supporting on the second barrel 112, and compress 11 side of being fixed on the machine of plate and in the vertical direction not
Can be mobile, in the winding process of voice coil line, mandrel 13 is freely rotated compressing in plate 11.In wire guide plate 12 close to compressing plate 11
During, it compresses plate 11 and compresses voice coil.It is understood that compressing plate 11 can also be fixedly connected with one end of mandrel 13.
In present embodiment, mandrel 13 is telescopically arranged in wire guide plate 12.Specifically, it is provided on wire guide plate 12
Through-hole 14, mandrel 13 is arranged in through-hole 14 and 14 size of through-hole is less than the Outside Dimensions of voice coil.Since 14 size of through-hole is less than
The Outside Dimensions of voice coil, so, wire guide plate 12 close to compress plate 11 during, the edge of through-hole 14 can compress under voice coil
Edge improves the reliability of voice coil to compress voice coil in voice coil height, which has structure simple, and easy to process is excellent
Point.
It is understood that 14 size of through-hole can also be not less than the Outside Dimensions of voice coil, set on wire guide plate 12 at this time
Set structure additional, for compressing voice coil lower edge.
It is noted that the winding tool of voice coil coiling further include for pilot plate 12 it is separate/close to compressing plate
11 controller 15, controller 15 and wire guide plate 12 are electrically connected, and the displacement of the shift length for detecting wire guide plate 12
Sensor 16, displacement sensor 16 and controller 15 are electrically connected, wherein controller 15 is for pilot plate 12 in mandrel
Separate on 13 axial direction/close to plate 11 is compressed, displacement sensor 16 is used to detect the shift length of wire guide plate 12 and will inspection
Survey result and be sent to controller 15 so that wire guide plate 12 it is separate/reach pre-determined distance close to compressing plate 11.Specifically,
During the first layer of coiling voice coil, when the non-coiling of the last lap of first layer, controller 15 controls every turn of mandrel 13
Dynamic 1 circle, simultaneously pilot plate 12 are separate on the axial direction of mandrel 13 to compress 11 first pre-determined distance of plate；Then, it controls
Close to 11 second pre-determined distance of plate is compressed on the axial direction of mandrel 13, the second pre-determined distance is less than 15 pilot plate 12 of device
First pre-determined distance；After the completion of the last lap coiling of first layer, axial direction of the 15 pilot plate 12 of controller in mandrel 13
It is close on direction to compress 11 third pre-determined distance of plate；During the second layer of coiling voice coil to the last layer, each layer
After the completion of last lap coiling, 15 pilot plate 12 of controller is close on the axial direction of mandrel 13 to compress plate 11 the 4th
Pre-determined distance, the 4th pre-determined distance are greater than third pre-determined distance.
Second embodiment of the present invention is related to a kind of winding tool 200 of voice coil, as shown in FIG. 5 and 6.Second embodiment party
Formula is roughly the same with first embodiment, is in place of the main distinction: in second embodiment of the invention, setting on wire guide plate 12
It is equipped with the metallic channel 17 for guiding voice coil coiling.So set, voice coil line can be made smoothly to pass in and out, be conducive to voice coil line around
System, so as to improve yield rate.
Preferably, wire guide plate 12 is arranged in close to the side for compressing plate 11 in metallic channel 17.So set, voice coil line can be made
It is fixed below machine, the coiling of voice coil line is more advantageous to, to further increase yield rate.
Third embodiment of the invention provides a kind of winding method of voice coil, as shown in Fig. 7 to 8, comprising the following steps:
S0: the winding tool of above-mentioned voice coil is provided.
Specifically, in step slo, the winding tool of voice coil includes: to compress plate, compress what plate was oppositely arranged with described
Wire guide plate and it is rotatably penetrated and arranged in the wire guide plate and for winding the mandrel of voice coil coiling, the wire guide plate is described
Plate can be compressed on the axial direction of mandrel far from described in and plate can be compressed close to described to compress the voice coil coiling, and first
It is described to compress plate and wire guide plate fitting under beginning state.
S1: the first layer of coiling voice coil, the first layer are the layer on the inside of voice coil.
Specifically, step S1 includes following sub-step:
S11: voice coil coiling is fixed on the mandrel.
Specifically, in step s 11, in present embodiment, wire guide plate close compress is provided with conducting wire on the side of plate
Slot, voice coil coiling are fixed on mandrel via metallic channel, to realize the coiling of voice coil coiling during mandrel rotates.It can
With understanding when, can also one end directly by voice coil coiling be fixed on mandrel.
S12: it controls 1 circle of mandrel rotation while to control the wire guide plate separate on the axial direction of the mandrel
It is described to compress the first pre-determined distance of plate.
Specifically, in step s 12, preferred first pre-determined distance is the line footpath of the voice coil coiling, i.e., often
Coiling one is enclosed, and wire guide plate reserves the space of a circle voice coil line for coiling voice coil.So set, it is mobile to can be avoided wire guide plate
Excessive distance and the waste for causing electric energy, save cost.
S13: controlling the wire guide plate and compress the second pre-determined distance of plate close to described on the axial direction of the mandrel, when
When the non-coiling of the last lap of first layer, return step S12.
Specifically, in step s 13, after every coiling one is enclosed, the winding tool compression for controlling voice coil is primary, passes through displacement
Sensor controls the second pre-determined distance, wherein second pre-determined distance is less than first pre-determined distance, the second pre-determined distance
So that two neighboring voice coil line close-packed arrays are advisable.By the way that in coiling first layer voice coil coiling, it is equal that voice coil line is enclosed in every coiling one
Compression is primary, so that the voice coil coiling arrangement of first layer is closely, is significantly reduced and dissipates circle, falls the bad phenomenons such as voice coil, mention
The reliability of high voice coil and the loudspeaker comprising the voice coil.
S14: it after the completion of the last lap coiling of first layer, controls the wire guide plate and is leaned on the axial direction of the mandrel
Plate third pre-determined distance is compressed described in close.
Specifically, in step S14, after the completion of the last lap coiling of first layer, the winding tool pair of voice coil is controlled
Voice coil recompression is primary.So set, the tightness of the voice coil coiling arrangement of first layer is further improved, to further subtract
Lack scattered circle, fall the bad phenomenons such as voice coil.Wherein, third pre-determined distance is not so as to two neighboring voice coil line close-packed arrays and damage
Bad voice coil line is advisable.
S2: the successively second layer of coiling voice coil to the last layer, the last layer are the layer on the outside of voice coil.
Specifically, in step S14, after the completion of each layer of last lap coiling, the wire guide plate is controlled described
The 4th pre-determined distance of plate is compressed close to described on the axial direction of mandrel；4th pre-determined distance is greater than third pre-determined distance.So
Setting, the every layer of voice coil coiling that ensure that the second layer to the last layer is close, in turn avoids voice coil coiling described in excess compression and makes
The case where damaging at voice coil coiling, improves the yields of voice coil and the loudspeaker comprising the voice coil.
Embodiment of the present invention in terms of existing technologies, during voice coil coiling, with the rotation of mandrel, sound
Astragal is wound on mandrel, meanwhile, for wire guide plate far from plate is compressed on the axial direction of mandrel, the coiling to voice coil line is reserved
Space out, when voice coil line one fixing turn of coiling, wire guide plate is close on the axial direction of mandrel to compress plate, thus from voice coil height
Two side compressions of degree are wound on the voice coil line on mandrel, so that the arrangement between voice coil line is more close, between voice coil line
Bonding dynamics is bigger, dissipates circle to effectively reduce, falls the bad phenomenons such as voice coil, improves voice coil and the loudspeaker comprising the voice coil
Reliability.
Be illustrated below by citing: initially, wire guide plate fits together with sliding panel；Pass through displacement sensor and control
Device control processed, in coiling first layer, so that mandrel is in every 360 degree of rotation, conducting wire Board position moves down the first pre-determined distance with pre-
The space of voice coil line coiling is stayed, which is substantially equal to the line footpath of enameled wire；Then, pass through displacement sensor and controller control
System, so that wire guide plate moves up the second pre-determined distance to compress voice coil line, which can be according to line footpath appropriate adjustment, but wants
Less than line footpath；Repeat the above steps, until the coiling of first layer last lap is after complete, pilot plate first move up second it is default away from
From, then third pre-determined distance is moved up, compression twice in succession is carried out to first layer voice coil line, so that the enameled wire of first layer arranges
Closely.In the coiling second layer, third layer etc., often once around the above just compression of two circles, and last lap coiling around
After complete, a pilot plate moves up third pre-determined distance, i.e., only carries out a reduced overall.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of winding tool of voice coil characterized by comprising compress plate, with it is described compress wire guide plate that plate is oppositely arranged,
And it is rotatably penetrated and arranged in the wire guide plate and the mandrel for winding voice coil coiling, axis of the wire guide plate in the mandrel
Plate can be compressed far from described in on direction and plate can be compressed close to described to compress the voice coil coiling.
2. the winding tool of voice coil according to claim 1, which is characterized in that the mandrel is rotatably arranged in described
It compresses in plate.
3. the winding tool of voice coil according to claim 1, which is characterized in that the mandrel is telescopically arranged in described
In wire guide plate.
4. the winding tool of voice coil according to claim 3, which is characterized in that be provided with through-hole, institute on the wire guide plate
State that mandrel is arranged in the through-hole and the clear size of opening is less than the Outside Dimensions of the voice coil.
5. the winding tool of voice coil according to claim 1, which is characterized in that be provided on the wire guide plate for guiding
The metallic channel of the voice coil coiling.
6. the winding tool of voice coil according to claim 5, which is characterized in that the metallic channel is arranged in the wire guide plate
Close to the side for compressing plate.
7. the winding tool of voice coil according to claim 1, which is characterized in that the winding tool of the voice coil coiling also wraps
Include: for controlling separate/close controller for compressing plate of the wire guide plate, the controller electrically connects with the wire guide plate
It connects.
8. the winding tool of voice coil according to claim 1, which is characterized in that the winding tool of the voice coil coiling also wraps
Include: for detecting the displacement sensor of the shift length of the wire guide plate, institute's displacement sensors electrically connect with the controller
It connects.
9. a kind of winding method of voice coil, which comprises the following steps:
S0: providing the winding tool of voice coil as claimed in any one of claims 1 to 8, in the initial state, it is described compress plate and
The wire guide plate fitting；
S1: the first layer of coiling voice coil, the first layer are the layer on the inside of voice coil；
S2: the successively second layer of coiling voice coil to the last layer, the last layer are the layer on the outside of voice coil；
Wherein, step S1 includes following sub-step:
S11: voice coil coiling is fixed on the mandrel；
S12: it controls 1 circle of mandrel rotation while controlling the wire guide plate on the axial direction of the mandrel far from described
Compress the first pre-determined distance of plate；
S13: controlling the wire guide plate and compress the second pre-determined distance of plate close to described on the axial direction of the mandrel, and described the
Two pre-determined distances are less than first pre-determined distance, when the non-coiling of the last lap of first layer, return step S12；
S14: after the completion of the last lap coiling of first layer, the wire guide plate is controlled on the axial direction of the mandrel close to institute
It states and compresses plate third pre-determined distance；
Step S2 the following steps are included:
After the completion of each layer of last lap coiling, controls the wire guide plate and supported on the axial direction of the mandrel close to described
The 4th pre-determined distance of pressing plate；4th pre-determined distance is greater than third pre-determined distance.
10. the winding method of voice coil according to claim 9, which is characterized in that first pre-determined distance is the sound
Enclose the line footpath of coiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880347.8A CN109068259A (en) | 2018-08-03 | 2018-08-03 | A kind of winding tool of voice coil and the winding method of voice coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880347.8A CN109068259A (en) | 2018-08-03 | 2018-08-03 | A kind of winding tool of voice coil and the winding method of voice coil |
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| CN109068259A true CN109068259A (en) | 2018-12-21 |
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| CN201810880347.8A Pending CN109068259A (en) | 2018-08-03 | 2018-08-03 | A kind of winding tool of voice coil and the winding method of voice coil |
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| CN112004179A (en) * | 2020-09-02 | 2020-11-27 | 瑞声新能源发展(常州)有限公司科教城分公司 | Voice coil manufacturing system, coil heating device and auxiliary unit |
| CN112040377A (en) * | 2020-09-02 | 2020-12-04 | 瑞声新能源发展(常州)有限公司科教城分公司 | Loudspeaker, voice coil manufacturing method and coil winding device |
| CN112040378A (en) * | 2020-09-02 | 2020-12-04 | 瑞声新能源发展(常州)有限公司科教城分公司 | Loudspeaker, voice coil manufacturing method and coil winding device |
| CN112040376A (en) * | 2020-09-02 | 2020-12-04 | 瑞声新能源发展(常州)有限公司科教城分公司 | Voice coil manufacturing system and voice coil manufacturing method |
| CN112053846A (en) * | 2020-09-02 | 2020-12-08 | 瑞声新能源发展(常州)有限公司科教城分公司 | Coil winding device and bobbin |
| CN112165677A (en) * | 2020-10-29 | 2021-01-01 | 瑞声新能源发展(常州)有限公司科教城分公司 | Winding method and winding device of double voice coils |
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| CN112053846A (en) * | 2020-09-02 | 2020-12-08 | 瑞声新能源发展(常州)有限公司科教城分公司 | Coil winding device and bobbin |
| CN112004179B (en) * | 2020-09-02 | 2021-09-24 | 瑞声新能源发展(常州)有限公司科教城分公司 | Voice coil manufacturing system, coil heating device and auxiliary unit |
| CN112053846B (en) * | 2020-09-02 | 2021-09-28 | 瑞声新能源发展(常州)有限公司科教城分公司 | Coil winding device |
| WO2022047866A1 (en) * | 2020-09-02 | 2022-03-10 | 瑞声声学科技(深圳)有限公司 | Coil winding apparatus and bobbin |
| WO2022047860A1 (en) * | 2020-09-02 | 2022-03-10 | 瑞声声学科技(深圳)有限公司 | Speaker, voice coil, method for manufacturing voice coil and coil winding device |
| WO2022047859A1 (en) * | 2020-09-02 | 2022-03-10 | 瑞声声学科技(深圳)有限公司 | Loudspeaker, voice coil, voice coil manufacturing method, and coil winding apparatus |
| CN112165677A (en) * | 2020-10-29 | 2021-01-01 | 瑞声新能源发展(常州)有限公司科教城分公司 | Winding method and winding device of double voice coils |
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Application publication date: 20181221 |