CN110996245B - Vibrating diaphragm forming die and vibrating diaphragm forming method - Google Patents
Vibrating diaphragm forming die and vibrating diaphragm forming method Download PDFInfo
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- CN110996245B CN110996245B CN201911096918.XA CN201911096918A CN110996245B CN 110996245 B CN110996245 B CN 110996245B CN 201911096918 A CN201911096918 A CN 201911096918A CN 110996245 B CN110996245 B CN 110996245B
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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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- 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
-
- 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
- H04R2231/001—Moulding aspects of diaphragm or surround
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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)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a vibrating diaphragm forming die and a vibrating diaphragm forming method, wherein the vibrating diaphragm forming die comprises a first pressing unit and a second pressing unit, the first pressing unit comprises a bearing part and an edge part arranged around the bearing part, and the bearing part is configured to be used for attaching a material belt and preheating the material belt; the second pressing unit is opposite to the first pressing unit; the second pressing unit comprises an enclosing part and an annular pressing part arranged in the enclosing part, and the enclosing part is configured to form sealing connection with the edge part of the first pressing unit; an airflow cavity is formed inside the annular pressing part and between the annular pressing part and the enclosing part; the annular pressing part is configured to be matched with the first pressing unit and used for pressing the material belt part corresponding to the annular pressing part to form a folded ring part of the vibrating diaphragm; the pressure of the airflow in the airflow cavity is matched with the first pressing unit to enable the material belt part corresponding to the airflow cavity to form the central part and the fixing part of the vibrating diaphragm.
Description
Technical Field
The invention relates to the technical field of electroacoustic products, in particular to a diaphragm forming die and a diaphragm forming method.
Background
As a device capable of converting electric energy into sound energy, a speaker has been widely used in mobile terminals such as mobile phones, computers, pads, and the like. The sound reproduction effect of the terminal device can be directly influenced by the quality of the loudspeaker performance; the diaphragm is one of the key parts for the loudspeaker to produce sound, the requirement on the quality of the diaphragm is higher and higher, and the diaphragm gradually develops towards the directions of high strength, high sound quality and low distortion, so that the structural requirement on the diaphragm forming die is more severe.
Loudspeaker vibrating diaphragm often uses compound vibrating diaphragm for guaranteeing the comprehensive properties of damping, intensity, temperature toleration, and current vibrating diaphragm material often uses the more than two-layer material of at least, like thermoplastic elastomer, glued membrane or rubber materials etc.. In the prior art, the central part and the fixed part of the loudspeaker diaphragm are mostly manufactured by adopting a die pressing forming method, and as about 80% or even more area of the diaphragm belongs to the central part and the fixed part, when the central part and the fixed part are formed by die pressing forming, the central part and the fixed part are easily adhered to each other due to the fact that the die is in large-area contact with the material belt and pressing, and further the flatness of the diaphragm is poor. In addition, because thermoplastic elastomer and glued membrane temperature resistance are low, intensity is little, lead to easily receiving the extrusion in the forming process, and the design of vibrating diaphragm adopts bellows and decorative pattern to improve the acoustics yield of vibrating diaphragm, this kind of design with camber structure uses current gas explosion or compression molding's mode, the vibrating diaphragm bellows root portion that leads to and the crowded gluey problem of decorative pattern become for vibrating diaphragm thickness is inhomogeneous because pressure is uneven or the mould pressing material hardness is too high, cut apart the leading cause that the vibration produced, thereby make the listening yield of speaker reduce and the reliability not enough, and bellows and decorative pattern part rupture membrane easily, the requirement to vibrating diaphragm high water-proofing, gas tightness at present can not be satisfied.
In view of the above, a new technical solution is needed to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a diaphragm forming die and a new technical scheme of a diaphragm forming method.
According to a first aspect of the present invention, there is provided a diaphragm forming mold, including:
the first laminating unit comprises a bearing part and an edge part arranged around the bearing part, and the bearing part is configured to be used for attaching the material belt and carrying out preheating treatment on the material belt;
the second pressing unit is opposite to the first pressing unit; the second pressing unit comprises an enclosing part and an annular pressing part arranged in the enclosing part, and the enclosing part is configured to form sealing connection with the edge part of the first pressing unit; an airflow cavity is formed inside the annular pressing part and between the annular pressing part and the enclosing part;
the annular pressing part is configured to be matched with the first pressing unit and used for pressing the material belt part corresponding to the annular pressing part to form a folded ring part of the vibrating diaphragm;
the pressure of the airflow in the airflow cavity is matched with the first pressing unit to enable the material belt part corresponding to the airflow cavity to form the central part and the fixing part of the vibrating diaphragm.
Optionally, the annular pressing part comprises a pressing block and a covering part arranged at the bottom of the pressing block, and the covering part is made of thermoplastic material or rubber material; the shape covering part is configured to be matched with the first pressing unit and used for pressing the material belt part corresponding to the shape covering part to form a folded ring part of the vibrating diaphragm.
Optionally, the cover-shaped part is made of rubber, and the rubber is made of one of silicon rubber, fluororubber, styrene butadiene rubber, nitrile butadiene rubber, triethylacrylic rubber, ethylene acrylate rubber and acrylate rubber; or the covering part is made of thermoplastic material, and the thermoplastic material is one of thermoplastic polyurethane, polytetrafluoroethylene, polyether ether ketone, ethylene-tetrafluoroethylene copolymer and fluorinated ethylene propylene copolymer.
Optionally, the hardness of the rubber material is 70A-92A.
Optionally, the thermoplastic material has a hardness of 40D-55D.
Optionally, the enclosing portion includes a bottom portion and a side portion disposed around the bottom portion, an end of the side portion away from the bottom portion is an opening, the opening is opposite to the bearing portion of the first pressing unit, and the side portion is configured to form a sealed connection with an edge portion of the first pressing unit.
Optionally, the side portion is provided with an airflow inlet configured for passing an airflow into the enclosure.
Optionally, the bearing portion of the first pressing unit is provided with an annular protrusion, the annular protrusion corresponds to the annular pressing portion, and the annular protrusion is configured to enable the material strap to be tightly attached to the surface of the annular protrusion under the action of the annular pressing portion to form a folded ring portion of the diaphragm.
Optionally, the pressing block and the cover-shaped portion are integrally formed or fixedly connected.
According to another aspect of the present invention, there is provided a diaphragm molding method using the diaphragm molding mold as described above, the method including:
attaching the material belt to the bearing part of the first pressing unit, and carrying out preheating treatment on the material belt by the bearing part;
the second pressing unit moves towards the first pressing unit, so that the annular pressing part is in contact with the material belt attached to the bearing part and heats the material belt; simultaneously, introducing a gas flow into the gas flow chamber;
and the second pressing unit continues to move towards the first pressing unit, the material belt part corresponding to the annular pressing part forms a bending ring part of the vibrating diaphragm, and the material belt part corresponding to the airflow cavity forms a central part and a fixing part of the vibrating diaphragm.
Optionally, a material belt portion corresponding to the airflow cavity inside the annular pressing portion forms a central portion of the diaphragm, and a material belt portion corresponding to the airflow cavity between the annular pressing portion and the enclosing portion forms a fixing portion of the diaphragm.
According to the vibrating diaphragm forming die, the central part and the fixing part of the vibrating diaphragm are formed through an air pressure forming method, so that the problem that the flatness of the vibrating diaphragm is poor due to the fact that the die is adhered to a material belt and the vibrating diaphragm is poor due to the fact that the die is in large-area contact with the material belt in a pressing mode can be solved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a diaphragm forming mold according to the present invention;
fig. 2 is a flow chart of a diaphragm forming method according to the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1, according to an embodiment of the present invention, a diaphragm forming mold is provided, including a first pressing unit 1 and a second pressing unit 2, where the first pressing unit 1 includes a carrying portion 11 and an edge portion 12 disposed around the carrying portion 11, and the carrying portion 11 is configured to attach a tape and perform a preheating process on the tape; the second pressing unit 2 is arranged opposite to the first pressing unit 1, the second pressing unit 2 comprises an enclosing part 21 and an annular pressing part 22 arranged in the enclosing part 21, and the enclosing part 21 is configured to form a sealing connection with the edge part 12 of the first pressing unit 1; an airflow cavity 23 is formed inside the annular pressing part 22 and between the annular pressing part 22 and the enclosing part 21; the annular pressing part 22 is configured to cooperate with the first pressing unit 1 for pressing the material belt part corresponding to the annular pressing part 22 to form a folded ring part of the diaphragm; the pressure of the airflow in the airflow cavity 23 is matched with the first pressing unit 1 to enable the material belt part corresponding to the airflow cavity 23 to form the center part and the fixing part of the diaphragm.
Generally, in order to facilitate the pressing, the first pressing unit 1 is generally disposed right below the second pressing unit 2, and the pressing is performed by pressing down. When the pressing is performed, the second pressing unit 2 moves downwards to be matched with the first pressing unit 1 below, and then the pressing can be completed. Has the advantages of simple and rapid pressing mode.
The structure of the vibrating diaphragm comprises a central part, a folded ring part arranged around the central part and a fixed part arranged around the folded ring part; the fixing portion is configured to be fixedly connected with a support member outside the diaphragm, for example, the fixing portion is fixedly connected at an inner wall of a housing of the speaker. The shape of the diaphragm may be, for example, a race track type, a rectangle or an ellipse, and the specific shape of the diaphragm may be designed according to actual needs, and the present invention is not particularly limited. In some embodiments, a hard ball top is further bonded to the central portion of the diaphragm as a reinforcing portion for adjusting the acoustic performance of the diaphragm. The material belt is a composite material, and specifically comprises a combination of at least two of polyether-ether-ketone, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, thermoplastic polyurethane, a thermoplastic polyester elastomer, an acrylic adhesive film and a silicone film.
According to the vibrating diaphragm forming die, the central part and the fixed part of the vibrating diaphragm are formed by the pressure of the airflow in the airflow cavity 23, and about 80% or more area of the vibrating diaphragm belongs to the central part and the fixed part, so that the central part and the fixed part are formed by the pressure forming, namely the air pressure forming method, of the airflow in the airflow cavity 23, and the problem that the flatness of the vibrating diaphragm is poor due to the fact that the die is adhered to a material belt and the material belt is pressed in a large-area contact mode due to the fact that the die is in contact with the.
In one embodiment, the annular pressing portion 22 includes a pressing block 221 and a covering portion 222 disposed at a bottom 211 of the pressing block 221, and the covering portion 222 is made of a thermoplastic material or a rubber material; the cover portion 222 is configured to cooperate with the first pressing unit 1 for pressing the material belt portion corresponding to the cover portion 222 to form a loop portion of the diaphragm. Optionally, a folded ring portion of the diaphragm is provided with a pattern, when the folded ring portion is rectangular, the pattern is arranged at four corners of the folded ring portion, and the pattern is radially distributed from the central portion outwards. The decorative pattern is protruding structure or groove structure, and the setting of decorative pattern can offset the stress that the vibrating diaphragm produced when the vibration, improves the compliance of vibrating diaphragm. The positions of the covering parts 222 corresponding to the patterns are provided with matched pattern structures.
According to the diaphragm forming die, the cover-shaped part 222 made of thermoplastic materials or rubber materials and arranged at the bottom 211 of the annular pressing part 22 is pressed to form the folded ring part of the diaphragm, and the problems that the traditional metal material is high in hardness and large in machining difficulty of fine positions are solved by utilizing the characteristics of high damping, low hardness and good thermosetting property of rubber. The rubber material, the thermoplastic material and the fine and dense corrugated ring patterns are used for carrying out coating matching to replace a traditional male and female die, the pressure is uniform when the forming die is pressed, the formed corrugated ring part and the patterned part of the corrugated ring part have uniform glue layer thickness, the forming is in place, the corrugated ring strength is high, the segmentation vibration of the vibrating diaphragm is superior to that of a conventional vibrating diaphragm, the patterns of the corrugated ring part and the corrugated ring part do not have the problems of collapse deformation and diaphragm rupture in reliability verification, the reliability and tolerance of the vibrating diaphragm are improved, and the nonlinear distortion and the reliability diaphragm rupture are reduced.
In one embodiment, the cover is made of a rubber material, and the rubber material is one of silicon rubber, fluorine rubber, styrene-butadiene rubber, nitrile rubber, triethyl acrylic rubber, ethylene acrylate rubber and acrylate rubber. The material of the rubber is not limited to the above. In one embodiment, the rubber material has a hardness of 70A-92A. The rubber material with the hardness within the range can avoid being adhered to the material belt while ensuring the pressing force.
In another embodiment, the overmold is a thermoplastic material that is one of a thermoplastic polyurethane, polytetrafluoroethylene, polyetheretherketone, ethylene-tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer. But not limited to, the above, and other thermoplastic materials satisfying the conditions may be used. Preferably, the thermoplastic material has a hardness of 40D to 55D. The thermoplastic material with the hardness within the range can avoid forming adhesion with the material belt while ensuring the pressing force.
In one embodiment, the enclosing portion 21 comprises a bottom portion 211 and a side portion 212 disposed around the bottom portion 211, an end of the side portion 212 away from the bottom portion 211 is an opening, the opening is opposite to the bearing portion 11 of the first stitching unit 1, and the side portion 212 is configured to form a sealing connection with the edge portion 12 of the first stitching unit 1. During pressing, the side 212 of the enclosing part 21 abuts against the edge part 12 of the first pressing unit 1 to form a sealing connection, so as to ensure the pressure of the air flow in the enclosing part 21.
In one embodiment, the side portion 212 is provided with an airflow inlet 2121, the airflow inlet 2121 being configured for letting in an airflow into the enclosure 21. Airflow enters the enclosing part 21 from the airflow inlet 2121, and an airflow cavity 23 is formed in the enclosing part 21, wherein the airflow cavity 23 located inside the annular pressing part 22 correspondingly forms a central part of the diaphragm, and the airflow cavity 23 located between the annular pressing part 22 and the enclosing part 21 correspondingly forms a fixed part of the diaphragm. Namely, the center part and the fixing part of the diaphragm are formed by adopting an air pressure forming method.
In one embodiment, the carrying part 11 of the first stitching unit 1 is provided with an annular protrusion 111, the annular protrusion 111 corresponds to the annular stitching part 22, and the annular protrusion 111 is configured to enable the material tape to be tightly attached to the surface of the annular protrusion 111 under the action of the annular stitching part 22 to form a bending part of the diaphragm. When the material tape is placed on the carrier portion 11, a portion of the material tape is located on the annular protrusion 111, and the material tape located on the annular protrusion 111 can be tightly attached to the surface of the annular protrusion 111 under the action of the annular pressing portion 22, that is, the bending portion of the diaphragm is formed by a die pressing method.
In one embodiment, the pressing piece 221 and the covering portion 222 are integrally formed or the pressing piece 221 and the covering portion 222 are fixedly connected. For convenience of manufacturing the mold, the pressing block 221 and the covering part 222 may be integrally formed; of course, the pressing piece 221 and the cover 222 may be designed to be separated, and the pressing piece 221 and the cover 222 may be fixedly connected together. So as to change the requirement that the cover type portion thereby adapts to different vibrating diaphragms fifty percent discount ring portions. Since the cover 222 can be used to heat the material belt, the cover 222 needs to have a certain heat resistance.
According to another embodiment of the present invention, there is provided a diaphragm molding method using the diaphragm molding die as described above with reference to fig. 2, the method including:
s1, attaching the tape to the bearing part 11 of the first pressing unit 1, and preheating the tape by the bearing part 11;
before lamination, firstly, horizontally attaching the material belt to the bearing part 11 of the first lamination unit 1, and preheating the material belt by the bearing part 11 of the first lamination unit 1; the material belt is a composite material, and specifically comprises a combination of at least two of polyether-ether-ketone, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, thermoplastic polyurethane, a thermoplastic polyester elastomer, an acrylic adhesive film and a silicone film.
S2, moving the second pressing unit 2 toward the first pressing unit 1, so that the annular pressing portion 22 contacts the tape attached to the carrier portion 11 and heats the tape; at the same time, the gas flow is introduced into the gas flow chamber 23;
the annular pressing part 22 comprises a pressing block 221 and a covering part 222 arranged at the bottom 211 of the pressing block 221, wherein the covering part 222 is made of rubber; specifically, the cover 222 contacts the surface of the material tape and heats the material tape to form the folded ring portion of the diaphragm. In the process, a gas flow is simultaneously introduced into the gas flow chamber 23.
S3, the second pressing unit 2 continues to move toward the first pressing unit 1, the strip portion corresponding to the annular pressing portion 22 forms a bending portion of the diaphragm, and the strip portion corresponding to the airflow chamber 23 forms a central portion and a fixing portion of the diaphragm.
Specifically, the strip portion corresponding to the airflow cavity 23 inside the annular pressing portion 22 forms a central portion of the diaphragm, and the strip portion corresponding to the airflow cavity 23 between the annular pressing portion 22 and the enclosing portion 21 forms a fixing portion of the diaphragm.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (11)
1. A diaphragm forming die, characterized by, includes:
the first laminating unit comprises a bearing part and an edge part arranged around the bearing part, and the bearing part is configured to be used for attaching the material belt and carrying out preheating treatment on the material belt;
the second pressing unit is opposite to the first pressing unit; the second pressing unit comprises an enclosing part and an annular pressing part arranged in the enclosing part, and the enclosing part is configured to form sealing connection with the edge part of the first pressing unit; an airflow cavity is formed inside the annular pressing part and between the annular pressing part and the enclosing part;
the annular pressing part is configured to be matched with the first pressing unit and used for pressing the material belt part corresponding to the annular pressing part to form a folded ring part of the vibrating diaphragm;
the pressure of the airflow in the airflow cavity is matched with the first pressing unit to enable the material belt part corresponding to the airflow cavity to form the central part and the fixing part of the vibrating diaphragm.
2. The diaphragm forming die of claim 1, wherein the annular pressing portion includes a pressing block and a cover portion disposed at a bottom of the pressing block, and the cover portion is made of a thermoplastic material or a rubber material; the shape covering part is configured to be matched with the first pressing unit and used for pressing the material belt part corresponding to the shape covering part to form a folded ring part of the vibrating diaphragm.
3. The diaphragm forming die of claim 2, wherein the cover portion is made of rubber, and the rubber is made of one of silicon rubber, fluorine rubber, styrene-butadiene rubber, nitrile rubber, triethylenepropylene rubber, ethylene acrylate rubber and acrylate rubber; or,
the cover-shaped part is made of thermoplastic materials, and the thermoplastic materials are one of thermoplastic polyurethane, polytetrafluoroethylene, polyether ether ketone, ethylene-tetrafluoroethylene copolymer and fluorinated ethylene propylene copolymer.
4. The mold for molding a diaphragm according to claim 2, wherein the rubber material has a hardness of 70A to 92A.
5. The diaphragm forming mold of claim 2, wherein the thermoplastic material has a hardness of 40D to 55D.
6. The diaphragm forming mold of claim 1, wherein the enclosing portion includes a bottom portion and a side portion disposed around the bottom portion, an end of the side portion away from the bottom portion is an opening, the opening is opposite to the bearing portion of the first pressing unit, and the side portion is configured to form a sealing connection with an edge portion of the first pressing unit.
7. The diaphragm forming mold of claim 6, wherein the side portion is provided with an airflow inlet configured to introduce airflow into the enclosure portion.
8. The mold for molding a diaphragm of claim 1, wherein the bearing portion of the first pressing unit is provided with an annular protrusion, the annular protrusion corresponds to the annular pressing portion, and the annular protrusion is configured to enable the material strip to be tightly attached to the surface of the annular protrusion under the action of the annular pressing portion to form the bending portion of the diaphragm.
9. The mold for molding a diaphragm according to claim 2, wherein the pressing block and the cover portion are integrally molded or fixedly connected.
10. A diaphragm forming method, characterized in that the diaphragm forming mold of any one of claims 1 to 9 is used, and the method includes:
attaching the material belt to the bearing part of the first pressing unit, and carrying out preheating treatment on the material belt by the bearing part;
the second pressing unit moves towards the first pressing unit, so that the annular pressing part is in contact with the material belt attached to the bearing part and heats the material belt; simultaneously, introducing a gas flow into the gas flow chamber;
and the second pressing unit continues to move towards the first pressing unit, the material belt part corresponding to the annular pressing part forms a bending ring part of the vibrating diaphragm, and the material belt part corresponding to the airflow cavity forms a central part and a fixing part of the vibrating diaphragm.
11. The diaphragm forming method of claim 10, wherein the material strip portion corresponding to the air flow chamber inside the annular pressing portion forms a central portion of the diaphragm, and the material strip portion corresponding to the air flow chamber between the annular pressing portion and the enclosing portion forms a fixing portion of the diaphragm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911096918.XA CN110996245B (en) | 2019-11-11 | 2019-11-11 | Vibrating diaphragm forming die and vibrating diaphragm forming method |
| PCT/CN2019/129548 WO2021093118A1 (en) | 2019-11-11 | 2019-12-28 | Diaphragm molding mold and diaphragm molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911096918.XA CN110996245B (en) | 2019-11-11 | 2019-11-11 | Vibrating diaphragm forming die and vibrating diaphragm forming method |
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| CN110996245A CN110996245A (en) | 2020-04-10 |
| CN110996245B true CN110996245B (en) | 2021-02-19 |
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| WO (1) | WO2021093118A1 (en) |
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| CN110996245A (en) | 2020-04-10 |
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