CN107182019A - The horn vibration piece making method of surface treatment - Google Patents
The horn vibration piece making method of surface treatment Download PDFInfo
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- CN107182019A CN107182019A CN201610132723.6A CN201610132723A CN107182019A CN 107182019 A CN107182019 A CN 107182019A CN 201610132723 A CN201610132723 A CN 201610132723A CN 107182019 A CN107182019 A CN 107182019A
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- base material
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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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
A kind of horn vibration piece making method of surface treatment, it includes an offer step, one first procedure of processing, one impregnation step, one drying steps, one hot forming step and a cutting step, wherein, the offer step provides a base material, and first procedure of processing changes the frictional force between the adhesive ability and internal fiber of the substrate surface in the utilization mode of shocking by electricity, so as to increase its surface roughness and surface area, again, when after the impregnation step, the base material adsorbs more resin, the drying steps are then passed through again, the hot forming step and the cutting step are formed with multiple horn vibrating reeds, there is better structural strength and antifatigue degree in order to up to the horn vibrating reed for making to be made, and loudspeaker service life can be extended and loudspeaker can be allowed to export preferably tonequality.
Description
Technical field
It is of the invention relevant with a kind of manufacture method, particularly relate to a kind of horn vibrating reed manufacture of surface treatment
Method.
Background technology
Press, it is to use cloth material winner that the non-metal workpiece base material that general trumpet is included, which has a variety of,
It can provide loudspeaker work main reason is that the cloth material by specially treated possesses appropriate elasticity and intensity
The requirement of function is wanted when dynamic, the vibrating reed such as bulging paper, bullet ripple, connection sheet, sound film ... belongs to it.
Only, the manufacture method for the shaping horn vibrating reed that tradition is used, mainly using cotton as stock,
And the manufacture method of the horn vibrating reed generally have resin impregnated step, baking procedure, imprint step with
And shaping cutting step.Cloth is impregnated among resin by resin impregnated step, cloth is absorbed resin,
And with certain hardness.Baking procedure dries the cloth for absorbing resin, to remove the moisture in cloth.
Imprint step heats the cloth for absorbing resin, forms required shape in section in imprint mode, for example,
It is wavy.Shaping cutting step is cut into multiple horn vibrating reeds, and unnecessary cloth is removed, and enters one
Step forms central through hole.
Also, in the existing field that horn vibrating reed part is manufactured, in the past for the anti-of its horn vibrating reed
Pinking and Structural strength calls are higher, and art personnel do not attempt to apply existing corona technology
In the improvement of horn vibrating reed, for example, its surface is pre-processed to promote the modification of its surface property.
For the stock of horn vibrating reed, some special material surface properties, such as chemical composition,
Hydrophily, roughness, crosslink density etc., are often the emphasis considered, and these special properties are available
The technology of surfaction, is handled with regard to material, and required superficiality can be met by having the surface of material
Matter.
Therefore, inventor thinks that existing horn vibrating reed still has with regard to structure and manufacture method and further changed
Good necessity, and have the generation of the present invention then.
The content of the invention
The purpose of the present invention is providing a kind of horn vibration piece making method of surface treatment, and it can be to loudspeaker
The substrate surface of vibrating reed carries out sided corona treatment, by the surface for the base material that shocks by electricity, and destroys its molecule knot
Structure, and then make the substrate surface molecular oxidation and polarization, by ion electric shock erosion surface, so as to change
The adhesive ability of substrate surface, so that the base material internal fiber can also adsorb more resin, so that loudspeaker
Vibrating reed has better structural strength and antifatigue degree, and can extend loudspeaker service life, can also solve elder generation
The problems of preceding technology or shortcoming.
For up to above-mentioned purpose, the horn vibration piece making method of surface treatment provided by the present invention：One carries
For step, it provides a base material, and the base material is formed by a plurality of warp yarn and a plurality of weft threads weaving；
One first procedure of processing, the base material is carried out Surface Machining processing by it, and first procedure of processing is electric to utilize
The mode of hitting changes the frictional force between the adhesive ability and internal fiber of the substrate surface；One impregnation step, will
Base material after processed step is impregnated in a resin；One drying steps, will be impregnated with the base material after the resin
Dried；One hot forming step, by the base material after the drying steps, further sequentially with hot pressing
Mode is heated to the base material, pressurizeed and moulding, the section of the base material is formed wavy；With
And a cutting step, the base material is cut, a vibrating reed is then obtained.
It is preferred that wherein further included one second procedure of processing, its any step after the impregnation step
To the secondary surface working process of the base material after rapid, and it is same to being surface-treated using the mode of electric shock.
It is preferred that being surface-treated respectively through one wherein in first procedure of processing and second procedure of processing
Equipment carries out Surface Machining processing to the base material, and the surface processing equipment is put with a conveyor module and one
Electric module, the discharge module is located at the side of the conveyor module.
It is preferred that wherein the conveyor module of the surface processing equipment has an at least first rotating shaft and at least one
Second rotating shaft, and the discharge module to should the side of first rotating shaft and second rotating shaft be respectively equipped with one and put
Electric unit, also, the base material is around between the first rotating shaft and second rotating shaft, and the first rotating shaft and
Second rotating shaft conveys the base material, adds so that the discharge module carries out surface to the two sides to the base material
Work processing.
It is preferred that wherein first procedure of processing and second procedure of processing is with the side of high frequency, electrion
Formula produces a plurality of ion beam, and makes the ion accelerate (beamacceleration) in the presence of highfield and impact the base material
Two sides, make to be broken and degrade through the resin chemical key in the base material after the impregnation step, the procedure of processing
To increase the base surface roughness and surface area.
It is preferred that wherein the warp yarn and the weft threads of the base material be selected from bamboo fiber, Aramid,
One of polyester fiber, cotton fiber, acryl fiber, silk fiber or polyethylene cycloalkanes fiber fiber
Or more than two kinds of fiber is constituted.
The horn vibration piece making method of surface treatment provided by the present invention, its mainly using this first plus
The rapid two sides to the base material of work step are surface-treated, and when Surface Machining is handled, the base material is around
Between the first rotating shaft and second rotating shaft, and the first rotating shaft and second rotating shaft convey the base material；Together
When, the discharge cell of the discharge module carries out Surface Machining processing to the two sides of the base material, and is somebody's turn to do
The mode of Surface Machining processing produces a plurality of ion beam in the way of high frequency, electrion, and in highfield
In the presence of make the ion accelerate (beamacceleration) and impact the two sides of the base material, make through first procedure of processing and
Chemical bond rupture is produced inside base material after second procedure of processing and is degraded, and the procedure of processing is to increase
The base surface roughness and surface area.
Thereby, the present invention increases the surface roughness and table of the base material two sides by first procedure of processing
Area, therefore, after the impregnation step, the base material adsorbs more resin, and after through the drying steps
Afterwards, the base material can more make the horn vibrating reed being made have better structural strength and antifatigue degree, and can prolong
Long trumpet service life, can also solve the problems of prior art or shortcoming, and loudspeaker can be made defeated
Go out the effectiveness of preferably tonequality.
Brief description of the drawings
Fig. 1 is the preparation method flow chart of first embodiment of the invention.
Fig. 2 is the manufacturing process schematic diagram of first embodiment of the invention.
Fig. 3 handles schematic diagram for the Surface Machining of first embodiment of the invention.
Fig. 4 is the close-up schematic view of the base material of first embodiment of the invention.
Fig. 5 is the fiber schematic diagram of the base material of first embodiment of the invention, the fibre before being processed with display surface
Tie up aspect.
Fig. 6 is the fiber schematic diagram of the base material of first embodiment of the invention, the fibre after being processed with display surface
Tie up aspect.
Fig. 7 is the experimental curve diagram of the substrate surface working process of first embodiment of the invention.
Fig. 8 is the finished product stereogram of first embodiment of the invention.
Fig. 9 is the preparation method flow chart of second embodiment of the invention.
Figure 10 is the manufacturing process schematic diagram of second embodiment of the invention.
Figure 11 is the preparation method flow chart of third embodiment of the invention.
Figure 12 is the manufacturing process schematic diagram of third embodiment of the invention.
Wherein, description of reference numerals is as follows：
S1 provides step
The procedure of processings of S2 first
S3 is impregnated with step
S4 drying steps
The procedure of processings of S5 second
S6 hot forming steps
S7 cutting steps
10 base materials
11 warp yarns
12 weft threads
13 fibers
20 surface processing equipments
21 conveyor modules
211 first rotating shafts
212 second rotating shafts
22 discharge modules
221 discharge cells
30 cell bodies
31 resins
40 drying plants
50 hot pressing dies
60 cutting means
70 vibrating reeds
80 ion beams
Embodiment
Fig. 1 and Fig. 2 is referred to, and is coordinated shown in Fig. 3, is the preparation method of first embodiment of the invention
Flow chart, manufacturing process schematic diagram and Surface Machining processing schematic diagram, it is that exposure has a kind of surface treatment
Horn vibration piece making method, the manufacture method includes：
One provides step S1, and it provides a base material 10, and the base material 10 is by a plurality of warp yarn 11 and a plurality of
The cross weaving of weft threads 12 is formed, and please refer to shown in Fig. 4, the warp yarn 11 and institute
State weft threads 12 and be selected from bamboo fiber, Aramid, polyester fiber, cotton fiber, acryl fiber, silk
One of fiber or polyethylene cycloalkanes fiber fiber or more than two kinds of fiber are constituted.In the present embodiment
In, referring again to shown in Fig. 5, the warp yarn 11 and the weft threads 12 by taking cotton fiber 13 as an example,
But do not limit embodiments of the present invention.
One first procedure of processing S2, the base material 10 is carried out Surface Machining processing by it, the first processing step
Rapid S2 changes the adhesive ability on the surface of base material 10 in the utilization mode of shocking by electricity.In the present embodiment, this
Through 20 pairs of a surface processing equipment, the base material 10 carries out Surface Machining processing to one procedure of processing S2, and is somebody's turn to do
Surface processing equipment 20 has a conveyor module 21 and a discharge module 22, and the conveyor module 21 has
Have a first rotating shaft 211 and one second rotating shaft 212,22 pairs of the discharge module should first rotating shaft 211 with
The side of second rotating shaft 212 is respectively equipped with a discharge cell 221.The base material 10 is around this first turn
Between axle 211 and second rotating shaft 212, and the first rotating shaft 211 and second rotating shaft 212 conveying should
Base material 10, so that the discharge module 22 carries out Surface Machining processing to the two sides to the base material 10.
Also, referring again to shown in Fig. 3, Fig. 5 and Fig. 6, first procedure of processing S2 surface treatment is set
Standby 20 discharge cell 221 produces a plurality of ion beam 80 in the way of high frequency, electrion, and in strong
Accelerate the ion beam 80 in the presence of electric field and impact the two sides of the base material 10, make through this first
The inside of base material 10 after procedure of processing S2 produces chemical bond rupture and degraded, and the procedure of processing is to increase
The surface roughness of base material 10 and surface area.
In addition, referring again to shown in Fig. 7, being that the Surface Machining of base material 10 of first embodiment of the invention is handled
Experimental curve diagram, by should be clear from the effect of the capillary after the first procedure of processing S2 surface treatment in figure
Should, the moisture pick-up properties of the cotton fiber 13 of the warp yarn 11 and the weft threads 12 is significantly improved really,
And with the increase of processing voltage, the suction head of the warp yarn 11 and the weft threads 12 also with
Increase, while as processing time increases；This is primarily due to processing and generated greatly on the surface of cotton fiber 13
Amount free radical simultaneously introduces some polar hydrophilic groups such as-OH ,-C=O ,-COOH, so that cotton fiber
The hygroscopicity on 13 surfaces is greatly improved.
One impregnation step S3, the base material 10 after processed step is impregnated in a resin 31.Yu Benshi
Apply in example, the solution of the resin 31 is installed in a cell body 30.
One drying steps S4, the base material 10 being impregnated with after the resin 31 is dried.In the present embodiment,
Its resin 31 for being adhered to the base material 10 through a drying plant 40 is dried, and makes the base material 10 overall
Structure has certain elasticity, toughness and intensity.
One hot forming step S6, by the base material after drying steps S4 and second procedure of processing S5
10, it is further transmitted through a hot pressing die 50 and sequentially the base material 10 is heated with hot pressing mode, pressurizeed
And it is moulding, then make the section of the base material 10 into wavy.
One cutting step S7, the base material 10 after hot forming step S6 is further cut out using one
60 pairs of the cutting apparatus base material 10 is cut, and then obtains a discoid vibrating reed 70, the vibrating reed
70 aspect system is as shown in Figure 8.
To supply to further appreciate that present invention construction feature, application technology means and desired effect reached,
Hereby occupation mode of the present invention is described, it is believed that when can have therefrom to the present invention deeper into and it is specific
Understand, as described below：
Referring again to Fig. 2 and Fig. 3, and coordinate shown in Fig. 5 to Fig. 7, be first embodiment of the invention
Manufacturing process schematic diagram, Surface Machining processing schematic diagram, fiber schematic diagram and experimental curve diagram.In surface
During working process, it mainly carries out surface using the first procedure of processing S2 to the two sides of the base material 10
Processing, and the base material 10 is around between the first rotating shaft 211 and second rotating shaft 212, and this first
Rotating shaft 211 and second rotating shaft 212 convey the base material 10.Meanwhile, the described of the discharge module 22 is put
The two sides of 221 pairs of base materials 10 of electric unit carry out Surface Machining processing, and institute is made in the presence of highfield
State the two sides that ion beam 80 accelerates and impacts and etch the base material 10；Make through first procedure of processing S2
The inside of base material 10 produce chemical bond rupture and degrade, the procedure of processing is to increase the surface of base material 10
Roughness and surface area.
Thereby, the present invention increases the rough surface of the two sides of base material 10 by first procedure of processing S2
Degree and surface area, therefore, after impregnation step S3, the base material 10 adsorbs more resin 31, and
After drying steps S4, the base material 10 is that can more make the vibrating reed 70 being made have preferred construction strong
Degree and antifatigue degree, and can extend loudspeaker service life, can also solve the problems of prior art or
Shortcoming, and the effectiveness that loudspeaker can be allowed to export preferably tonequality.
Please continue to refer to the preparation method flow chart for shown in Fig. 9 and Figure 10, being second embodiment of the invention and
Manufacturing process schematic diagram.Compared in the present embodiment with first embodiment, its is different to be in the present embodiment
Many one second procedure of processing S5, its in after the either step after impregnation step S3 to the base material 10 2
Subsurface working process, and it is same to being surface-treated using the mode of electric shock., should in the present embodiment
Equally the first procedure of processing S2 mode gives the both side surface of base material 10 to second procedure of processing S5 as described above
Give Surface Machining processing.Thereby, second procedure of processing S5 is mainly to the secondary instrument of base material 10
Face working process, in order to up to making the interior surface resin 31 and cotton fiber 13 of the base material 10 become coarse, enters
And the frictional force between fiber 13 is enhanced, so that the structural strength of the base material 10 increases.
Please continue to refer to the preparation method flow chart for shown in Figure 11 and Figure 12, being third embodiment of the invention
And manufacturing process schematic diagram.Compared in the present embodiment with first embodiment, its difference be this first
Procedure of processing S2 carries out table after impregnation step S3 and before the hot forming step to the base material 10
Face working process, and the first procedure of processing S2 changes the attached of the surface of base material 10 in the utilization mode of shocking by electricity
The frictional force between ability and internal fiber 13.Thereby, the present invention is by first procedure of processing S2's
Surface Machining processing, in order to up to making the interior surface cotton fiber 13 of the base material 10 become coarse, and then strengthens
Frictional force between fiber 13, so that the structural strength of the base material 10 increases.
Hereby, then by the feature and its attainable expected effect of the present invention it is presented below：
The present invention surface treatment horn vibration piece making method, its by the first procedure of processing S2 with
Change the frictional force between the adhesive ability and internal fiber 13 on the surface of base material 10 using the mode of electric shock, from
And increase the surface roughness and surface area surface roughness and surface area of the two sides of base material 10, also, working as
After impregnation step S3, the base material 10 adsorbs more resin 31, and the drying steps are then passed through again
S4, the hot forming step S6 and cutting step S7 are formed with multiple vibrating reeds 70, in order to up to making to be made
Vibrating reed 70 there is better structural strength and antifatigue degree, and loudspeaker service life can be extended and can be allowed
Loudspeaker output preferably tonequality.
In summary, the present invention has its splendid progress practicality in fact in like product, while all over looking into state
Also identical construction is found no in the inside and outside technical data on this class formation, document to exist formerly, is
With in accordance with the law the present invention is real to have possessed patent of invention important document, and whence is filed an application.
Only, it is described above, it is only the preferable possible embodiments of the present invention, therefore such as using the present invention
Equivalent structure change carried out by specification and claim, ought to be included in the scope of the claims of the present invention
It is interior.
Claims (10)
1. the horn vibration piece making method of a kind of surface treatment, it is characterised in that it includes：
One provides step, and it provides a base material, and the base material is interlocked volume by a plurality of warp yarn and a plurality of weft threads
Knit and form；
One first procedure of processing, the base material is carried out Surface Machining processing by it, and first procedure of processing is with profit
Change the frictional force between the adhesive ability and internal fiber of the substrate surface with electric shock mode；
One impregnation step, the base material after the first procedure of processing is impregnated in a resin；
One drying steps, the base material being impregnated with after the resin is dried；
One hot forming step, by the base material after the drying steps, further sequentially with hot pressing mode pair
The base material is heated, pressurizeed and moulding, then shapes the base material；And
One cutting step, will be cut in the base material, then obtains a vibrating reed.
2. the horn vibration piece making method of surface treatment according to claim 1, it is characterised in that
One second procedure of processing is further included, it is in secondary to the base material after the either step after the impregnation step
Surface Machining processing, and it is same to being surface-treated using the mode of electric shock.
3. the horn vibration piece making method of surface treatment according to claim 2, it is characterised in that
The base material is carried out through a surface processing equipment respectively in first procedure of processing and second procedure of processing
Surface Machining processing, and the surface processing equipment has a conveyor module and a discharge module, the electric discharge mould
Block is located at the side of the conveyor module.
4. the horn vibration piece making method of surface treatment according to claim 3, it is characterised in that
The conveyor module of the surface processing equipment has an at least first rotating shaft and at least one second rotating shaft, and this is put
Electric module to should the side of first rotating shaft and second rotating shaft be respectively equipped with a discharge cell, also, the base
Material is around between the first rotating shaft and second rotating shaft, and the first rotating shaft and second rotating shaft conveying should
Base material, so that the discharge module carries out Surface Machining processing to the two sides to the base material.
5. the horn vibration piece making method of surface treatment according to claim 2, it is characterised in that
First procedure of processing and second procedure of processing produce a plurality of ion beam in the way of high frequency, electrion,
And make the ion accelerate (beamacceleration) in the presence of highfield and impact the two sides of the base material, make through this first
Chemical bond rupture is produced inside base material after procedure of processing and second procedure of processing and is degraded, processing step
Suddenly to increase the base surface roughness and surface area.
6. the horn vibration piece making method of surface treatment according to claim 1, it is characterised in that
It is fine that the warp yarn and the weft threads of the base material are selected from bamboo fiber, Aramid, polyester fiber, cotton
One of dimension, acryl fiber, silk fiber or polyethylene cycloalkanes fiber fiber or more than two kinds of fibre
Dimension is constituted.
7. the horn vibration piece making method of a kind of surface treatment, it is characterised in that it includes：
One provides step, and it provides a base material, and the base material is interlocked volume by a plurality of warp yarn and a plurality of weft threads
Knit and form；
One impregnation step, the base material after processed step is impregnated in a resin；
One drying steps, the base material being impregnated with after the resin is dried；
One hot forming step, by the base material after the drying steps, further sequentially with hot pressing mode pair
The base material is heated, pressurizeed and moulding, then makes the section of the base material into wavy, while the base material
It is formed with a plurality of pressing area；
One cutting step, is cut area is pressed described in the base material after the hot forming step, and
A plurality of discoid vibrating reed is obtained afterwards；And
One first procedure of processing, it will be after the impregnation step and before the hot forming step to the base
Material carries out Surface Machining processing, and first procedure of processing changes the substrate surface in the utilization mode of shocking by electricity
Frictional force between adhesive ability and internal fiber.
8. the horn vibration piece making method of surface treatment according to claim 7, it is characterised in that
First procedure of processing carries out Surface Machining processing, and the surface through a surface processing equipment to the base material
Processing equipment system has a conveyor module and a discharge module, and the discharge module is located at the one of the conveyor module
Side.
9. the horn vibration piece making method of surface treatment according to claim 8, it is characterised in that
The conveyor module of the surface processing equipment has an at least first rotating shaft and at least one second rotating shaft, and this is put
Electric module to should the side of first rotating shaft and second rotating shaft be respectively equipped with a discharge cell, also, the base
Material is around between the first rotating shaft and second rotating shaft, and the first rotating shaft and second rotating shaft conveying should
Base material, so that the discharge module carries out Surface Machining processing to the two sides to the base material.
10. the horn vibration piece making method of surface treatment according to claim 7, it is characterised in that
First procedure of processing produces a plurality of ion beam in the way of high frequency, electrion, and in the work of highfield
Make the ion accelerate (beamacceleration) under and impact the two sides of the base material, make through the base after first procedure of processing
Chemical bond rupture is produced inside material and is degraded, and the procedure of processing is to increase the base surface roughness and table
Area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610132723.6A CN107182019A (en) | 2016-03-09 | 2016-03-09 | The horn vibration piece making method of surface treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610132723.6A CN107182019A (en) | 2016-03-09 | 2016-03-09 | The horn vibration piece making method of surface treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107182019A true CN107182019A (en) | 2017-09-19 |
Family
ID=59830316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610132723.6A Pending CN107182019A (en) | 2016-03-09 | 2016-03-09 | The horn vibration piece making method of surface treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107182019A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111263290A (en) * | 2018-11-30 | 2020-06-09 | 大原博 | Method for manufacturing loudspeaker vibrating reed by simultaneously utilizing different raw cloth |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004159181A (en) * | 2002-11-07 | 2004-06-03 | Seiko Instruments Inc | Mobile electronic apparatus equipped with diaphragm type speaker |
| CN203984686U (en) * | 2014-07-14 | 2014-12-03 | B.O.B.股份有限公司 | The horn vibrating reed that discharge process is molded |
| CN105323696A (en) * | 2014-07-14 | 2016-02-10 | B.O.B.股份有限公司 | Loudspeaker vibrating reed and discharge treatment molding method thereof |
-
2016
- 2016-03-09 CN CN201610132723.6A patent/CN107182019A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004159181A (en) * | 2002-11-07 | 2004-06-03 | Seiko Instruments Inc | Mobile electronic apparatus equipped with diaphragm type speaker |
| CN203984686U (en) * | 2014-07-14 | 2014-12-03 | B.O.B.股份有限公司 | The horn vibrating reed that discharge process is molded |
| CN105323696A (en) * | 2014-07-14 | 2016-02-10 | B.O.B.股份有限公司 | Loudspeaker vibrating reed and discharge treatment molding method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111263290A (en) * | 2018-11-30 | 2020-06-09 | 大原博 | Method for manufacturing loudspeaker vibrating reed by simultaneously utilizing different raw cloth |
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Application publication date: 20170919 |