CN118042395A - Manufacturing process of dome root integrated loudspeaker sound membrane combined structure - Google Patents

Abstract

The invention discloses a manufacturing process of a dome root integrated loudspeaker sound membrane combined structure, which comprises the following steps of: forming a cambered surface profile of a suspended edge by hot press molding of a diaphragm raw material; step two, forming the ball top: forming a ball top by hot press molding of another diaphragm raw material, wherein the periphery of the lower end of the ball top is integrally and downwards convexly provided with a root extending along a circle; step three, combining the suspended edge and the spherical top: spraying a circle of glue on the periphery of the upper end of the ball top, enabling the area of the glue to be equal to the area of the inner peripheral side surface of the arc-shaped edge of the hanging edge, and then assembling the hanging edge on the ball top from top to bottom to enable the inner peripheral side surface of the arc-shaped edge of the hanging edge to be adhered to the glue; step four, winding the voice coil: winding the enamelled wire on the peripheral side wall of the root by taking the root as a winding shaft to form a coil; therefore, the root strength of the diaphragm is enhanced, the split vibration is reduced, the effective bandwidth is expanded, the acoustic performance of the loudspeaker is improved, the consistency of the loudspeaker curve is better optimized, and the nonlinear distortion is reduced.

Description

Manufacturing process of dome root integrated loudspeaker sound membrane combined structure

Technical Field

The invention relates to the technology of loudspeaker sound film combination field, in particular to a manufacturing process of a dome root integrated loudspeaker sound film combination structure.

Background

The diaphragm is the core component of the horn and plays a decisive role in horn performance. Most loudspeaker diaphragms are formed by pressing single raw material films, are limited by structures, mostly ensure low-frequency sound quality effects, but cannot consider middle and high frequency bands, and voice coils move in the middle and high frequency bands, so that the diaphragms are easy to split and vibrate, and nonlinear problems are caused.

In a simple form, when the voice coil vibrates, longitudinal vibration and transverse vibration are generated on the diaphragm, wherein the transverse vibration is transmitted outwards from the voice coil position of the diaphragm and then reflected back by the diaphragm, so that standing waves are formed on the diaphragm, and peaks and valleys of a frequency response curve are formed. When the diaphragm moves from the bass range to the midrange, the diaphragm moves approximately in an up-down integral piston mode, the folded ring (flange) part of the diaphragm moves reversely with the carcass of the diaphragm, and the phase is opposite or inconsistent, so that the sound pressure is reduced, the distortion is increased, and the curve midrange valley is formed.

In the loudspeaker common in the market at present, reinforcing ribs are often designed on the suspension edge of the diaphragm to increase the rigidity of the whole structure of the diaphragm, so that the effect of improving the generation of split vibration is achieved. And increase the strengthening rib, can reduce diaphragm self compliance, the amplitude about the synchronous reduction diaphragm for loudspeaker curve bandwidth narrows, and to high frequency signal response variation, causes loudspeaker tone quality to sink partially, lacks more sound details, will directly influence the product of using to user's experience.

In addition, the conventional loudspeaker manufacturing process belongs to a series of 'diaphragm and voice coil' stations with the highest technical difficulty, wherein the voice coil and the diaphragm are positioned by a jig for gluing and bonding, and then the glue is solidified by an oven or a UV furnace. On one hand, each production line runs and at least needs hundreds of precise upper and lower combined jigs for operation turnover, and the cost is high; on the one hand, the operation of skilled staff is needed, and the labor is also quite consumed; on the other hand, the combination of the diaphragm and the voice coil is bonded by glue, the requirements on the glue proportion, the glue amount and the glue beating position are harsh, deviation is easy to occur in the manufacturing process, and the batch defect of the loudspeaker is easy to be caused. Moreover, the reject ratio caused by the sound membrane assembly station is basically the highest in the production of the loudspeaker.

Disclosure of Invention

In view of the above, the present invention aims at overcoming the drawbacks of the prior art, and its main objective is to provide a manufacturing process of a dome root integrated loudspeaker voice film assembly structure, which enhances the root strength of a diaphragm, reduces the split vibration, expands the effective bandwidth, improves the acoustic performance of a loudspeaker, better optimizes the consistency of a loudspeaker curve, reduces nonlinear distortion, directly winds a coil to the root of the diaphragm, does not need a conventional diaphragm and voice coil series station, and saves the labor cost.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

A manufacturing process of a dome root integrated loudspeaker sound membrane combined structure comprises the following steps:

step one, shaping a suspension edge: forming a cambered surface profile of a suspended edge by hot press molding of a diaphragm raw material; then, cutting off the central part of the central area of the hanging edge to form a middle hole in the central area of the hanging edge, and enabling the upper end of the middle hole to integrally and upwardly and inwards extend with an arc edge at the edge of the central area of the hanging edge; and redundant materials at the edge of the overhanging edge are cut off;

Step two, forming the ball top: forming a ball top by hot press molding of another diaphragm raw material, wherein the periphery of the lower end of the ball top is integrally and downwards convexly provided with a root extending along a circle;

step three, combining the suspended edge and the spherical top: spraying a circle of glue on the periphery of the upper end of the ball top, enabling the area of the glue to be equal to the area of the inner peripheral side surface of the arc-shaped edge of the hanging edge, and then assembling the hanging edge on the ball top from top to bottom to enable the inner peripheral side surface of the arc-shaped edge of the hanging edge to be adhered to the glue;

Step four, winding the voice coil: and winding the enamelled wire on the peripheral side wall of the root by taking the root as a winding shaft to form a coil.

As a preferable scheme, the radian of the arc edge of the suspension edge is consistent with the radian of the periphery of the upper end of the ball top.

In the third step, the suspension edge is assembled on the top of the ball from top to bottom, and after the inner peripheral side surface of the arc-shaped edge of the suspension edge is adhered to the glue, the suspension edge and the top of the ball are pressed and attached by adopting a pressure maintaining jig.

As a preferred scheme, pressurize tool includes tool upper die and tool lower mould, the tool upper die has the face of pressing down, the tool lower mould has down the face of pressing down and the cavity of stepping down of establishing from lower face of pressing down, the root stretches into the cavity of stepping down, go up the face of pressing down and jointly form the pressfitting to ball top and hanging limit with lower face of pressing down.

In a preferred embodiment, in the fourth step, a space is kept between the lower end of the wound coil and the lower end of the root.

Compared with the prior art, the voice coil has the advantages and beneficial effects that the voice coil is characterized in that in the step one of edge-hanging forming, the edge-hanging is integrally formed with the arc-shaped edge, in the step two of top-of-sphere forming, the top-of-sphere is integrally formed with the root, then in the step three of combination of the edge-hanging and the top-of-sphere forming, a circle of glue is sprayed on the periphery of the upper end of the top-sphere, the area of the glue is equal to the area of the inner peripheral side surface of the arc-shaped edge of the edge-hanging, the edge-hanging is assembled on the top-of-sphere from top to bottom, the inner peripheral side surface of the arc-shaped edge of the edge-hanging is adhered to the glue, finally, in the step four, the voice coil is wound by taking the root as a winding shaft, the enameled wire is wound on the outer peripheral side wall of the root to form the coil, so that the root is formed on the top-of-sphere of the diaphragm, the root strength of the diaphragm is enhanced, the split vibration is reduced, the effective bandwidth is expanded, the acoustic performance of the loudspeaker is improved, the consistency of a loudspeaker curve is better, nonlinear distortion is reduced, the coil is directly wound to the root of the diaphragm, and the conventional voice coil is saved; secondly, the materials of the membrane hanging edge and the ball top can be selected to be diversified and more flexible; the membrane forming design and the voice coil winding process are flexibly selected; the bearing power and the service life of the loudspeaker are increased;

And the invention only needs to cover the root inner diameter of the diaphragm on the head of the winding machine according to the conventional voice coil wire winding mode, and normally hangs the enameled wire, thus the operation of winding the voice coil can be completed, because the voice coil is directly wound on the root outer diameter of the diaphragm, a plurality of problems of bonding the voice coil and the diaphragm by glue are thoroughly solved, and the influence of the glue bonding on the service life of the loudspeaker is also overcome; the negative influence of glue on the acoustic performance is eliminated, and the consistency of the product is ensured; the loss of glue to the loudspeaker BL value is eliminated, the rigidity of the diaphragm voice coil position is increased, and the high-frequency analysis force and extensibility are better.

In order to more clearly illustrate the structural features, technical means, and specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and the specific embodiments.

Drawings

FIG. 1 is a schematic view showing a combination structure of a hanging edge and a dome according to an embodiment of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a side-view illustration of a hanging edge according to an embodiment of the present invention;

FIG. 4 is a schematic view of a ball top in accordance with an embodiment of the invention;

Fig. 5 is an enlarged view at B shown in fig. 4;

FIG. 6 is a schematic diagram of a combination of a cantilever edge and a dome to form a diaphragm and a voice coil wound around the diaphragm according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a pressure maintaining fixture for pressing and attaching a suspended edge and a suspended edge to each other after combining the suspended edge and the suspended edge to form a membrane and placing the membrane on the pressure maintaining fixture according to an embodiment of the present invention;

FIG. 8 is a graph of a frequency response curve versus test according to an embodiment of the present invention;

fig. 9 is a graph of distortion curve contrast test according to an embodiment of the present invention.

The attached drawings are used for identifying and describing:

10. Suspended edge 11, middle hole

12. Arc edge 20, ball top

21. Root 22, arcuate bond

30. Coil 40, glue

50. Jig upper die 60 and jig lower die

61. And (5) a yielding cavity.

Detailed Description

Referring to fig. 1 to 9, specific structures of embodiments of the present invention are shown.

A manufacturing process of a dome root integrated loudspeaker sound membrane combined structure comprises the following steps:

Step one, shaping a suspension edge: forming the cambered surface profile of the suspended edge 10 by hot press molding of a diaphragm raw material; then, cutting off the central part of the central area of the overhanging edge 10 to form a central hole 11 in the central area of the overhanging edge 10, and integrally and upwardly projecting an arc-shaped edge 12 from the upper end of the central hole 11 to the edge of the central area of the overhanging edge 10; and cutting off redundant materials at the edge of the overhanging edge 10;

Step two, forming the ball top: forming a spherical top 20 by hot press molding of another film raw material, wherein the periphery of the lower end of the spherical top 20 is integrally and downwards convexly provided with a root 21 extending along a circle; here, another membrane raw material with different materials can be selected according to different sound quality requirements, and the ball top 20 with different materials is formed by hot press molding;

Step three, combining the suspended edge and the spherical top: spraying a circle of glue 40 on the periphery of the upper end of the ball top 20, enabling the area of the glue 40 to be equal to the area of the inner peripheral side face of the arc-shaped edge 12 of the hanging edge 10, and then assembling the hanging edge 10 on the ball top 20 from top to bottom, so that the inner peripheral side face of the arc-shaped edge 12 of the hanging edge 10 is adhered to the glue 40; here, the arc of the arc edge 12 of the hanging edge 10 is consistent with the arc of the circumference of the upper end of the dome 20; here, the hanging edge 10 is assembled on the ball top 20 from top to bottom, and after the inner peripheral side surface of the arc-shaped edge 12 of the hanging edge 10 is adhered to the glue 40, the hanging edge 10 and the ball top 20 are pressed and attached by adopting a pressure maintaining jig; the pressure maintaining jig comprises a jig upper die 50 and a jig lower die 60, wherein the jig upper die 50 is provided with an upper pressing surface, the jig lower die 60 is provided with a lower pressing surface and a yielding cavity 61 concavely arranged from the lower pressing surface, the root 21 stretches into the yielding cavity 61, and the upper pressing surface and the lower pressing surface jointly form pressing of the dome 20 and the hanging edge 10; thus, the glue 40 can be thoroughly dried by the up-down pressure maintaining of the pressure maintaining jig, and the overhanging edge 10 and the dome 20 are pressed and formed, so that the whole lamination is smooth and concentric; here, the overhanging edge 10 and the dome 20 combine to form a membrane;

Step four, winding the voice coil: taking the root 21 as a winding shaft, selecting wires, wire diameters and turns of the enameled wire according to design, and winding the enameled wire on the peripheral side wall of the root 21 to form a coil 30; here, the lower end of the wound coil 30 is kept spaced from the lower end of the root 21 by about 0.2mm to prevent the wire from being separated from the root 21 and causing a bad phenomenon such as wire scattering.

In the manufacturing process, the arc edge 12 of the suspension edge 10 is glued and bonded with the dome 20, three layers of composites are quite involved, so that the voice coil is thicker than peripheral materials in the position area, the hardness is higher, the root 21 is in a complete circle shape, and has strong supporting force, which is equivalent to adding an elastic wave similar to a traditional cone loudspeaker in a vibration system, thereby tending to the piston movement when the loudspeaker diaphragm vibrates up and down, avoiding nonlinearity to a great extent and reducing distortion to be lower.

In the manufacturing process, the horn with heavy bass is designed, and the hanging edge 10 is made of a more flexible material; the dome 20 may be made of thicker material for forming the root 21 of the stretched film; the low frequency component and lower FO value are sufficiently ensured.

In the above manufacturing process, the raw material of the diaphragm is mostly plastic materials, and the raw material is in a roll shape when supplied, and the size of the diaphragm forming mold is generally designed according to the width of the material, for example: the length of the material roll is 1050 m and the width of the material roll is 1m, so that the effective forming size of the die is controlled to be less than 1m, and the surplus material is reserved outside the die for subsequent operation; and cutting the membrane material into regular square sheets from a roll shape by using a cutting die, so that the sheet material can be placed in the die for hot press molding. The die is generally used for hot-pressing a plurality of independent horn diaphragms at a time, namely, one die is used for forming N holes, and the total number of holes of one die is designed according to the model size of the horn diaphragms. And placing the cut square material into a lower die of a machine die, confirming flatness, and then pneumatically controlling the upper die to move downwards from top to bottom to be matched with the lower die, so that the material is in a gap between the upper die and the lower die of the die at high temperature, and the deformation and the molding of diaphragm radian, surface engraving and the like are completed. Hot press molding of the mold, and temperature control depends on the properties of the materials, such as: PET is generally controlled between 150-180deg.C. After molding, the upper die is lifted, the whole piece of molded material is held, the material is taken out from the lower die, whether each cavity membrane is damaged, dirty, wrinkled and other defects are checked, and paint Mao Biaozhu is used for preventing subsequent mixing. And then cutting the horn diaphragms in each hole one by one from the whole material by adopting a cutting die, thus completing the whole diaphragm forming process.

Because the voice coil is directly wound on the root 21 of the diaphragm, the operations of fixture positioning, glue 40 bonding and the like are not needed, the deviation easily occurring in various processes is reduced, the integral consistency of the acoustic performance of the loudspeaker is finally improved, and in addition, a lot of cost is saved in an intangible way. The root 21 of the diaphragm is directly attached to the voice coil, and the root 21 and the dome 20 of the diaphragm are integral, so that concentricity and combination strength of the diaphragm and the voice coil are guaranteed to be higher, and the advantages are incomparable by the conventional operation of positioning and gluing by a jig.

The same horn structure is configured, two kinds of conventional whole PET film and the composite film of this scheme are adopted respectively, and curve comparison test is performed, the test results are shown in figures 8 and 9, and comparison figures 8 and 9 can be seen: in the red circle: 1. the frequency response FR curve, the medium-high frequency sensitivity is higher than that of the conventional scheme, and the frequency bandwidth also has advantages; 2. the distortion curve is lower than the conventional scheme in the scheme of medium and high frequency. The above test results fully demonstrate that the loudspeaker-sound film combination of the present scheme meets the expected effect.

In this embodiment, the manufacturing process of the loudspeaker voice film combined structure can be adopted to manufacture a dome root integrated loudspeaker voice film combined structure, and the dome root integrated loudspeaker voice film combined structure comprises a hanging edge 10 and a dome 20; the center area of the suspended edge 10 is provided with a middle hole 11, the upper end of the middle hole 11 is integrally provided with an arc-shaped edge 12 which extends upwards and inwards in a protruding mode at the edge of the center area of the suspended edge 10, the periphery of the lower end of the dome 20 is integrally provided with a root 21 which extends along a circle in a protruding mode downwards, the suspended edge 10 is assembled on the dome 20 from top to bottom, the arc-shaped edge 12 is adhered to the periphery of the upper end of the dome 20, and a coil 30 is wound on the peripheral side wall of the root 21. The lower end of the coil 30 is spaced from the lower end of the root 21 to prevent the wire from being separated from the root 21 and causing defects such as wire scattering. An arc-shaped bonding part 22 is formed at the periphery of the upper end of the dome 20, and the arc-shaped edge 12 is bonded to the arc-shaped bonding part 22. The arc of the arcuate edge 12 corresponds to the arc of the arcuate bond 22. Here, the root 21 is integrally connected with the dome 20, and the coil 30 is wound on the peripheral side wall of the root 21, so that the voice coil can be supported by the inner diameter keel of the root 21 serving as a voice coil, and the voice coil can be directly attached to the root 21 of the diaphragm, and the root 21 and the dome 20 of the diaphragm are of an integrated structure, so that concentricity and combination strength of the diaphragm and the voice coil are ensured to be higher, the voice coil and the diaphragm are not required to be bonded, a plurality of problems of bonding the voice coil and the diaphragm by using the glue 40 are thoroughly solved, and the influence of the glue 40 bonding on the service life of a loudspeaker is also overcome; the negative influence of the glue 40 on the acoustic performance is eliminated, and the consistency of the product is ensured; the loss of the glue 40 to the loudspeaker BL value is eliminated, the rigidity of the diaphragm voice coil position is increased, and the high-frequency resolution and extensibility are better.

In summary, the design key point of the invention is that in the step one, the suspension edge is integrally formed with an arc edge, in the step two, the ball top is integrally formed with a root in the step two, then in the combination of the suspension edge and the ball top, a circle of glue is sprayed on the periphery of the upper end of the ball top, the area of the glue is equal to the area of the inner peripheral side surface of the arc edge of the suspension edge, the suspension edge is assembled on the ball top from top to bottom, the inner peripheral side surface of the arc edge of the suspension edge is adhered to the glue, finally, in the step four, the voice coil is wound, the root is taken as a winding shaft, and the enamelled wire is wound on the outer peripheral side wall of the root to form a coil, so that the root strength of the diaphragm is enhanced, the split vibration is reduced, the effective bandwidth is expanded, the acoustic performance of the loudspeaker is improved, the consistency of the loudspeaker curve is better optimized, nonlinear distortion is reduced, the coil is directly wound to the root of the diaphragm, and the conventional voice coil and the voice coil is not required to be in the work station of the diaphragm; secondly, the materials of the membrane hanging edge and the ball top can be selected to be diversified and more flexible; the membrane forming design and the voice coil winding process are flexibly selected; the bearing power and the service life of the loudspeaker are increased; and the invention only needs to cover the root inner diameter of the diaphragm on the head of the winding machine according to the conventional voice coil wire winding mode, and normally hangs the enameled wire, thus the operation of winding the voice coil can be completed, because the voice coil is directly wound on the root outer diameter of the diaphragm, a plurality of problems of bonding the voice coil and the diaphragm by glue are thoroughly solved, and the influence of the glue bonding on the service life of the loudspeaker is also overcome; the negative influence of glue on the acoustic performance is eliminated, and the consistency of the product is ensured; the loss of glue to the loudspeaker BL value is eliminated, the rigidity of the diaphragm voice coil position is increased, and the high-frequency analysis force and extensibility are better.

The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical principles of the present invention are still within the scope of the technical solutions of the present invention.

Claims (5)

1. A manufacturing process of a dome root integrated loudspeaker sound membrane combined structure is characterized by comprising the following steps of: the method comprises the following steps:

step one, shaping a suspension edge: forming a cambered surface profile of a suspended edge by hot press molding of a diaphragm raw material; then, cutting off the central part of the central area of the hanging edge to form a middle hole in the central area of the hanging edge, and enabling the upper end of the middle hole to integrally and upwardly and inwards extend with an arc edge at the edge of the central area of the hanging edge; and redundant materials at the edge of the overhanging edge are cut off;

Step two, forming the ball top: forming a ball top by hot press molding of another diaphragm raw material, wherein the periphery of the lower end of the ball top is integrally and downwards convexly provided with a root extending along a circle;

step three, combining the suspended edge and the spherical top: spraying a circle of glue on the periphery of the upper end of the ball top, enabling the area of the glue to be equal to the area of the inner peripheral side surface of the arc-shaped edge of the hanging edge, and then assembling the hanging edge on the ball top from top to bottom to enable the inner peripheral side surface of the arc-shaped edge of the hanging edge to be adhered to the glue;

Step four, winding the voice coil: and winding the enamelled wire on the peripheral side wall of the root by taking the root as a winding shaft to form a coil.

2. The process for manufacturing the dome root integrated loudspeaker voice film combined structure according to claim 1, wherein the process comprises the following steps of: the radian of the arc edge of the suspension edge is consistent with the radian of the periphery of the upper end of the ball top.

3. The process for manufacturing the dome root integrated loudspeaker voice film combined structure according to claim 1, wherein the process comprises the following steps of: in the third step, the suspension edge is assembled on the top of the ball from top to bottom, and after the inner peripheral side surface of the arc-shaped edge of the suspension edge is adhered to the glue, the suspension edge and the top of the ball are pressed and attached by adopting a pressure maintaining jig.

4. A process for manufacturing a dome root integrated horn-sound film composite structure according to claim 3, wherein: the pressure maintaining jig comprises a jig upper die and a jig lower die, wherein the jig upper die is provided with an upper pressing surface, the jig lower die is provided with a lower pressing surface and a yielding cavity concavely arranged from the lower pressing surface, the root part of the jig lower die stretches into the yielding cavity, and the upper pressing surface and the lower pressing surface jointly form pressing of a spherical top and a hanging edge.

5. The process for manufacturing the dome root integrated loudspeaker voice film combined structure according to claim 1, wherein the process comprises the following steps of: in the fourth step, the lower end of the wound coil is spaced from the lower end of the root.