JP2010245687A - Method for manufacturing diaphragm of loudspeaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a diaphragm of a loudspeaker, by which a diaphragm of a complicated shape is molded inexpensively to easily deal with the production of many kinds in a small lot. <P>SOLUTION: The method for manufacturing the diaphragm 1 of a loudspeaker S uses a laser sintering three-dimensional lamination molding method to mold a diaphragm 1 of the loudspeaker S. The laser sintering three-dimensional lamination layer molding method deposits particles of a synthetic resin to the fixed thickness of deposition, then, forms a sintered layer where the particles are sintered by radiating lasers to the layer of the deposited particles, and forms cross sections in succession in the direction of disposition. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a speaker diaphragm manufacturing method for manufacturing a speaker diaphragm using a laser sintering three-dimensional additive manufacturing method.

The diaphragm of the speaker is formed into various shapes such as a cone shape, a dome shape, and a flat plate shape by cutting a paper, a sheet, or a film into an appropriate size and rounding or adhering them. However, there is also a need to form the diaphragm in a complicated shape other than the above-described shape in order to impart acoustic characteristics characteristic to the speaker. When the diaphragm is formed into such a complicated shape, it is often difficult to form the diaphragm from a sheet or film. Therefore, as shown in Patent Document 1, a technique for forming a diaphragm into a complicated shape by injection molding has been developed.
The method for manufacturing a diaphragm disclosed in Patent Document 1 is to inject a polypropylene resin into a die formed in a cone shape and form the diaphragm as an integral body, and is a conventional method for molding from a sheet or film. In comparison, it is possible to flexibly cope with complicated shapes.

Japanese Utility Model Publication No. 6-29297

However, even in the manufacturing method of Patent Document 1 in which a diaphragm is formed by an injection molding method using a mold, the shape of the diaphragm is difficult to pull out after molding, for example, a dome shape with a hollow inside. In some cases or in the case of a complicated shape having ribs on the surface of the diaphragm, it may be difficult to form the diaphragm.
In addition, when a diaphragm is molded by an injection molding method using a mold, the shape of the diaphragm is often corrected until the desired sound quality can be achieved, and the mold is also corrected each time the correction of the shape is repeated. I have to do it. However, since the speaker is often produced in a large variety of small lots, if such a modification of the mold is performed for only a small number of varieties, labor and labor are very large. . In other words, the manufacturing method of Patent Document 1 has a problem that it cannot sufficiently cope with the production of a large variety of small lots because the maintenance of the mold takes too much time and labor.

  The present invention has been made in view of the above problems, and provides a method for manufacturing a diaphragm for a speaker that can form a diaphragm having a complicated shape at low cost and can easily cope with the production of a wide variety of small lots. The purpose is to do.

In order to achieve the object, the present invention takes the following technical means.
In other words, the speaker diaphragm manufacturing method of the present invention is characterized in that a speaker diaphragm is formed using a laser sintering three-dimensional additive manufacturing method.
Specifically, the laser-sintered three-dimensional additive manufacturing method (Selective Laser Sintering, hereinafter referred to as SLS) deposits synthetic resin fine particles to a constant deposition thickness, and then deposits on the deposited fine particle layer. By irradiating a laser, a sintered layer in which the fine particles are sintered is formed and continuously formed in the sintered layer deposition direction.

The inventor is due to the fact that the above-mentioned problems are all due to the use of a mold, and in order to fundamentally solve such problems, there is no choice but to manufacture a diaphragm without using a mold. Thought. Then, the present invention has been completed by discovering that these problems can be solved at once by using a laser sintering three-dimensional additive manufacturing method that can be formed into a complicated shape using a laser.
That is, if the laser-sintered three-dimensional additive manufacturing method is used, the diaphragm can be formed without using a mold, and it is not necessary to assume the case of extracting the mold in advance. It can also be formed into any shape. In addition, since it is not necessary to design and manufacture a mold, it is possible to reduce the manufacturing cost of the diaphragm. Furthermore, the design can be easily changed without troublesome work such as mold correction and redesign, and therefore, it is possible to sufficiently cope with the production of a large variety of small lots.

In addition, when irradiating the layer of fine particles deposited as described above with a laser, it is possible to manufacture a diaphragm having different physical characteristics for each surface portion by changing the output of the laser. It is also possible to manufacture diaphragms having different physical characteristics in the plate thickness direction.
In this way, by changing the laser output along the surface of the deposited layer and the direction of the deposited thickness, the physical characteristics such as Young's modulus and internal loss can be changed appropriately according to the location of the diaphragm, and Various sound quality can also be realized by incorporating.
Simultaneously with the manufacture of the diaphragm, at least one of an edge, a dust cap, a damper, or a coil support disposed adjacent to the diaphragm can be formed integrally with the diaphragm.

If the edge, dust cap, damper, or coil support is formed at the same time as the diaphragm is manufactured in this way, joining and assembling of these members and the diaphragm becomes unnecessary, and the manufacturing process of the speaker is further simplified and manufactured. Costs can be reduced.
Furthermore, as the fine particles of the synthetic resin, it is preferable to use polypropylene spherical particles whose average particle diameter is adjusted to 10 to 100 μm, more preferably 40 to 70 μm.
The diaphragm must be made of a material that is lightweight and has mechanical strength, Young's modulus, and moderate internal loss. Specifically, pulp, pulp mixed with various materials, polymer materials such as polypropylene, metals such as aluminum and titanium, knitted fibers such as polyester and silk, aramid and carbon, etc. are used. The
Also when manufacturing a diaphragm using the laser sintering three-dimensional layered manufacturing method, a thermoplastic synthetic resin can be used as the above-described polymer material. Among such thermoplastic resins, a diaphragm having high rigidity, light weight, and moderate internal loss can be obtained by using the above-mentioned polypropylene spherical fine particles having a relatively high Young's modulus among general-purpose resins. Can be configured.

  In the laser sintering three-dimensional additive manufacturing method, processing is performed while depositing fine particles of synthetic resin as a layer having a predetermined thickness. The deposited layer is formed by leveling the accumulated fine particles of synthetic resin to a certain thickness using a member such as a roller or a wiper. Therefore, the fine particles of the synthetic resin are required to be even, but if the average particle size is adjusted to 10 to 100 μm, more preferably 40 to 70 μm as described above, laser sintering is performed. The fluidity of the fine particles can be adjusted in accordance with the system of the three-dimensional additive manufacturing machine, and the thickness of the deposited layer can be made constant or can be appropriately changed.

In the laser sintering three-dimensional additive manufacturing method, it is preferable to use synthetic resin fine particles having an average particle diameter in the range of 10 to 100 μm for the reasons described above. Synthetic resin fine particles (for example, particles having an average particle diameter exceeding 100 μm or particles having an average particle diameter of less than 10 μm) whose average particle diameter is out of these ranges can also be used.
The fine particles of the synthetic resin may include a filler that imparts rigidity to the sintered layer.

  According to the method for manufacturing a diaphragm for a speaker of the present invention, a diaphragm having a complicated shape can be formed at a low cost, and can be easily adapted to the production of a large variety of small lots.

It is front sectional drawing of the speaker provided with the diaphragm manufactured with the manufacturing method of this invention. It is explanatory drawing which shows the process of the manufacturing method of this invention. It is a figure which shows the fine cross-section of the diaphragm manufactured with the manufacturing method of this invention. It is a figure which shows the fine cross-section of the other diaphragm manufactured with the manufacturing method of this invention. It is a figure which shows the example of a shape of the diaphragm which can be manufactured with the manufacturing method of this invention.

Hereinafter, the manufacturing method of the diaphragm 1 of the speaker S according to the present invention will be described with reference to the drawings. In the following description, the manufacturing method of the diaphragm of the present invention will be described by taking a manufacturing method of manufacturing the diaphragm 1 of the cone type speaker as an example.
First, the speaker S provided with the diaphragm 1 manufactured by the manufacturing method of the present invention will be described.
As shown in FIG. 1, the speaker S is a cone-type speaker, and includes a frame 2 formed in an inverted conical shape (cone shape) around an axis (rotation axis R) facing in the vertical direction. Inside the frame 2, a diaphragm 1 formed in an inverted conical shape having a slightly smaller size than the frame 2 is disposed. A step portion 3 is formed on the outer peripheral edge of the frame 2 in the circumferential direction, and an annular edge 5 is sandwiched and fixed so that a ring-shaped locking tool 4 is fitted into the step portion 3. The outer peripheral side of the edge 5 is fixed to the step 3 of the frame 2 as described above, and the inner peripheral side is connected to the outer peripheral edge of the diaphragm 1, and the diaphragm 1 and the frame 2 are connected via the edge 5. Are connected to each other.

An opening 6 penetrating in the vertical direction is formed at the center of the frame 2, and a box-like yoke 7 opening upward is provided below the opening 6. A ring-shaped magnet 8 that opens up and down in accordance with the opening 6 of the yoke 7 is attached to the inside of the yoke 7, and a vertical hole 9 that passes downward from the opening 6 of the yoke 7 through the inside of the magnet 8. The lower end of the diaphragm 1 is loosely inserted into the vertical hole 9.
In the following description, the top and bottom in FIG. 1 are the top and bottom when the diaphragm 1 is described. In FIG. 1, the direction away from the rotational axis R of the diaphragm 1 is referred to as the outer peripheral side when the diaphragm 1 is described, and the direction approaching the rotational axis R is referred to as the inner peripheral side.

As shown in FIG. 1, the diaphragm 1 integrally includes a horn portion 10 that spreads upward in a horn shape and a cylindrical coil support 11 that extends downward from the lower end of the horn portion 10. Yes. A coil 12 that vibrates the diaphragm 1 by receiving the magnetic force of the magnet 8 provided on the yoke 7 is provided on the outer peripheral surface of the coil support 11, and between the outer peripheral surface on the upper side of the coil 12 and the frame 2. Is provided with a damper 13 for attenuating the vibration of the diaphragm 1.
A dust cap 14 is provided on the upper side of the coil support 11 to prevent foreign matter from entering. The dust cap 14 is formed in a spherical shape (dome shape) upward, and is provided integrally with the upper end of the coil support 11. Further, the annular edge 5 described above is provided integrally with the diaphragm 1 on the outer peripheral side of the diaphragm 1. The edge 5 and the dust cap 14 may be formed as separate members from the diaphragm 1. However, in this embodiment, the edge 5 and the dust cap 14 are integrally formed on the diaphragm 1. ing.

When the diaphragm 1 having the above-described configuration is manufactured, the conventional manufacturing method is manufactured by injection molding using a mold. That is, after the molten polypropylene is poured between the upper mold formed along the upper surface shape of the diaphragm 1 and the lower mold formed along the lower surface shape, the molded product is cooled and solidified. The diaphragm 1 was formed by taking out.
However, in order to give the speaker S characteristic acoustic characteristics, there is a need to form the diaphragm 1 in a complicated shape other than the above-described shape. Some of these complicated shapes are difficult to mold by an injection molding method using a mold, such as a dome shape with a hollow interior or a shape having ribs on the surface.

In addition, in the conventional injection molding method that requires a mold, the mold must be corrected every time the correction of the shape is repeated. There was also a problem that it was not possible to carry out even for the varieties, and could not cope with the production of a large variety of small lots.
Therefore, in the manufacturing method of the diaphragm 1 of the present invention, the diaphragm 1 of the speaker S is formed using a laser sintering three-dimensional layered manufacturing method that can be formed without using a mold. In the laser sintering three-dimensional additive manufacturing method, fine particles of a synthetic resin are deposited to a constant deposition thickness, and then the sintered fine particles are sintered by irradiating the deposited fine particle layer with a laser. Forming is performed by forming a sintered layer continuously in the deposition direction.

As a manufacturing apparatus 28 for manufacturing the diaphragm 1 by the laser sintering three-dimensional layered manufacturing method, for example, an apparatus that deposits fine particles of synthetic resin to a constant deposition thickness using a roller or a wiper is known. In the present embodiment, the apparatus 28 of the present invention will be described using a roller as an example.
As shown in FIG. 2, the manufacturing apparatus 28 includes a pair of left and right stages 20, 21 arranged at a distance from each other, and a parts head 22 arranged so as to be movable up and down between the left and right stages 20, 21. Have. The left and right stages 20 and 21 are arranged so that their upper surfaces have the same height, and through holes 23 are formed on the upper surfaces so as to penetrate the stage 20 in the vertical direction. These through-holes 23 are filled with polypropylene resin fine powder (spherical particles 18), and a piston-shaped feeder 24 is disposed below the polypropylene resin fine powder so as to be vertically movable. .

On the upper side of the stage 20, a roller 25 whose outer peripheral surface can contact the upper surface of the stage 20 is provided. The roller 25 can move horizontally while rolling, and can move between the left and right stages 20 and 21.
Above the parts head 22, a carbon dioxide laser gun 26 and an irradiation mirror 27 for irradiating the fine powder deposited on the upper surface of the parts head 22 with the laser generated by the laser gun 26 are provided. The irradiation mirror 27 can sinter only an arbitrary portion of the fine powder deposited on the upper surface of the part head 22 based on a control signal from a control device (not shown) so as to form a sintered layer. For example, a control signal is sent from the control device to the irradiation mirror 27 in accordance with the cross-sectional shape data of CAD, so that the sintered layer can be formed in the shape according to the cross-sectional shape data.

The diaphragm 1 is manufactured according to the following manufacturing process using the manufacturing apparatus 28 described above.
When the feeder 24 of the through hole 23 of the left stage 20 is moved upward, the fine powder of polypropylene resin placed on the upper side of the feeder 24 rises, and the fine powder of polypropylene resin is piled up on the upper surface of the left stage 20. To be supplied.
Next, as shown in FIG. 2A, the roller 25 is moved horizontally from the left stage 20 toward the right stage 20 while rolling. Then, the fine powder supplied in a pile shape on the upper surface of the left stage 20 is leveled by the roller 25 and spreads on the upper surface of the part head 22, and the fine powder is deposited on the upper surface of the part head 22 with a uniform thickness.

  As shown in FIG. 2B, the laser generated by the laser gun 26 is guided to the irradiation mirror 27, and a control signal is sent from the control device to the irradiation mirror 27 according to the cross-sectional shape data of the diaphragm 1 to move the irradiation mirror 27. Sinter the fine powder. Then, the laser is irradiated only to the portion along the cross-sectional shape of the diaphragm 1 in the fine powder deposited on the upper surface of the part head 22, and a sintered layer is formed in the laser irradiated portion. At this time, if the output of the laser gun 26 is increased or decreased in accordance with the irradiation position, the spherical particles 18 of polypropylene are melted and a dense sintered layer is formed if the output of the laser is increased as will be described later. If the output is reduced, the spherical spherical particles 18 of the polypropylene remain undissolved to form a hollow sintered layer, and the microstructure of the sintered layer can be changed.

As shown in FIG. 2C, after the laser irradiation is finished, the parts head 22 is lowered by the thickness of the deposition layer 29. When the feeder 24 of the through hole 23 of the right stage 20 is moved upward, the fine powder of polypropylene resin placed on the upper side of the feeder 24 rises, and the fine powder of polypropylene resin is placed on the upper surface of the right stage 20. Supplied in piles.
As shown in FIG. 2D, the roller 25 is moved horizontally from the right stage 20 toward the left stage 20 while rolling. Then, the fine powder supplied in a pile shape on the upper surface of the right stage 20 is leveled by the roller 25 and spreads on the upper surface of the parts head 22, and on the upper surface of the deposited layer 29 after firing, the thickness of the descending distance of the parts head 22 is obtained. Only fine powder accumulates.

As shown in FIG. 2E, a fine powder is fired by irradiating the deposited layer 29 further deposited on the upper surface of the fired deposited layer 29 with a laser in the same manner as in FIG. . At this time, by irradiating a laser beam with a different output onto the previously deposited layer, the fine structure of the sintered layer can be changed also in the deposition direction.
As shown in FIG. 2 (f), the firing process is performed by repeating the above-described procedures from FIG. 2 (a) to FIG. 2 (e) by the number of cross-sectional shape data (the number of cross-sectional slices). When the firing step is finished, the unfired fine powder is blown with air or the like, and the diaphragm 1 is obtained by performing appropriate cleaning or the like.

The diaphragm 1 manufactured using the laser sintering three-dimensional additive manufacturing method as described above is formed of a sintered body of polypropylene fine particles. This sintered body has a characteristic fine structure formed by sintering fine particles of polypropylene (spherical particles 18) by laser irradiation. Next, the fine structure of the diaphragm 1 will be described in detail.
The diaphragm 1 has the same fine structure in any part of the coil support 11 (A in FIG. 3), the inner peripheral side (B in FIG. 3), and the inner peripheral side (C in FIG. 3) of the horn part 10. I have. As shown in the enlarged view of FIG. 3, the diaphragm 1 is formed of three layers of a surface layer 15 on the front side, an inner layer 16, and a surface layer 17 on the back side in the thickness direction.

The front-side and back-side surface layers 15 and 17 are formed by melting spherical particles 18 of polypropylene, which is a material, by laser irradiation, and are formed densely (without voids) from polypropylene. Since polypropylene is a synthetic resin having a relatively large Young's modulus (1.5 to 2.0 GPa) among general-purpose resins, the diaphragm 1 having a large Young's modulus is formed by forming the surface layer 15 with such polypropylene. can do.
In addition, the spherical particles 18 of polypropylene are mixed in a predetermined amount from a particle size adjusted to a particle size of 10 μm to a particle size adjusted to a particle size of 100 μm to have an average particle size of 10 to 100 μm, preferably an average. The particle size is adjusted so that the particle size is 40 to 70 μm.

  Since such polypropylene fine particles are formed using a pulverization method, the particle shape is unlikely to be spherical, and those formed using a suspension polymerization method are difficult to obtain a predetermined particle size. It is preferably produced by a melt dispersion method (melt kneading method) using In the melt dispersion method, a thermoplastic resin that is incompatible with polypropylene (for example, a water-soluble thermoplastic resin such as polyethylene oxide) is supplied into a kneader, and the molten polypropylene is extruded into a dispersion medium of the thermoplastic resin. Then, the particles are produced by dispersing polypropylene in a dispersion medium in a dispersion medium using a kneader and removing only the dispersion medium by dissolving in water after kneading and cooling. The polypropylene fine particles produced by such a melt dispersion method are likely to have a particle shape with a circularity of 0.7 or more, and form a deposition layer 29 having a uniform thickness in the laser sintering three-dimensional additive manufacturing method. Is suitable.

The surface of the polypropylene spherical particles 18 is preferably coated with aggregation preventing particles such as silica, alumina, titania, zinc oxide, or hydroxyapatite. The spherical spherical particles 18 coated with such agglomeration preventing particles are less likely to agglomerate between particles, and are suitable for forming the inner layer 16 in which many cavities 19 exist between the particles as will be described later. Because.
The inner layer 16 is formed by leaving spherical polypropylene particles 18 as a material without being completely dissolved by laser irradiation, and a sparse state having many cavities 19 between the spherical spherical particles 18. Is formed. When the cavities 19 are formed in this manner, the internal loss increases. Therefore, the internal loss of the diaphragm 1 can be increased by providing such an internal layer 16.

The surface layers 15 and 17 and the inner layer 16 are formed by changing the output of the laser with respect to the deposited layer of spherical particles 18 of polypropylene. That is, if the laser output is increased to completely dissolve the polypropylene spherical particles 18, the surface layer 15 as described above can be obtained, and the laser output is decreased to prevent the polypropylene spherical particles 18 from being completely dissolved. By doing so, the spherical particles 18 remain in the particle state, and the hollow inner layer 16 is obtained.
Thus, for example, the first deposited layer is irradiated with a high-power laser, the deposited layer is then irradiated with a low-power laser, and the last deposited layer is further irradiated. If the high-power laser is irradiated again, a fine structure as shown in the enlarged view of FIG. 3 can be formed, and the diaphragm 1 having different physical characteristics such as Young's modulus and internal loss in the thickness direction is manufactured. It becomes possible.

In addition, in the manufacturing method of the diaphragm 1 of this invention, the diaphragm 1 provided with the following fine structures besides the above-mentioned fine structure can be shape | molded.
For example, it is possible to obtain a fine structure in which fine powder deposited inside is surrounded by a flat wall as shown by A portion in FIG. Such a fine structure can be obtained by increasing the laser output in the portion corresponding to the wall to dissolve the deposited layer 2 and decreasing or reducing the laser output to 0 for the portion where the fine powder remains. Can do.
In addition, the fine structure of the portion A in FIG. 4 was surrounded by a flat wall, whereas the fine powder deposited inside the curved wall as in the portion B in FIG. The remaining fine structure can also be obtained. Such a fine structure is obtained by performing sintering so that a portion where the laser output is reduced or reduced to 0 is circular with respect to the deposited layer 29 and changing the diameter of the circular portion in the deposition direction. Can do.

Further, if the output of the irradiated laser is increased to dissolve the deposition layer 29 continuously over the entire surface and in the deposition direction, the fine powder is completely dissolved and there is no cavity as shown in part C of FIG. A fine microstructure can also be obtained.
In portions A and B of FIG. 4, the size and density of the cavity in which the fine powder is confined are variously changed, and the physical characteristics such as the internal loss and Young's modulus of the diaphragm 1 are changed to the deposited layer 29. It can be changed for each part of the surface. Therefore, if sintering is performed as described above, it is possible to manufacture the diaphragm 1 having different physical characteristics for each surface portion.

If the diaphragm 1 is manufactured using the laser sintering three-dimensional additive manufacturing method as described above, the diaphragm 1 can be formed into various complicated shapes. In addition, since it is not necessary to manufacture a mold, it is possible to manufacture at a low cost.
In addition, the manufacturing method of the diaphragm 1 of the present invention using the laser sintering three-dimensional additive manufacturing method is particularly advantageous when, for example, the diaphragm 1 having the following shape is manufactured.
For example, as shown in FIG. 5A, in the case where the diaphragm 1 in which the dome-shaped dust cap 14 is integrally formed on the upper surface of the diaphragm 1, only a small lot is molded, injection using a mold is performed. In the molding method, there is a possibility that the cost of the mold per molding is increased. However, if it is a manufacturing method of the diaphragm 1 of the present invention using the laser sintering three-dimensional additive manufacturing method, it is not necessary to consider the drawing of the mold. Can be molded at low cost.

Further, as shown in FIG. 5B, when the rib 30 is formed on the horn portion 10 of the diaphragm 1 in the circumferential direction, it is necessary to form the upper and lower molds in a complicated shape. In the case of lots, it may be difficult to mold particularly by an injection molding method using a mold. Further, when it is desired to engrave a pattern such as the logo 31 on a part of the surface of the diaphragm 1, it is necessary to provide a stamping process after the injection molding, and the manufacturing process is likely to be complicated. Further, a part of the diaphragm 1 and the edge 5, the dust cap 14, the damper 13 or the coil support 11 connected to the horn part 10 are formed thick (in FIG. 5B, the coil support 11 is formed thick. In the case of exemplifying a product), the manufacturing process tends to be complicated.
However, the manufacturing method of the diaphragm 1 of the present invention using the laser sintering three-dimensional additive manufacturing method does not require a complicated mold, and the above-described method can be obtained by simply changing the program of the manufacturing apparatus 28. The rib 30 and the logo 31 can be formed, or the thickness of the molded product can be arbitrarily changed. For example, as shown in FIG. 5B, by changing the output of the laser, the logo 31 is formed by creating a sparse or dense portion on the surface, or the rib 30 is formed by making the surface uneven. It is also possible to do. Further, according to physical characteristics required for the diaphragm 1, for example, strength, etc., when the coil support 11 or the like, which is originally a separate object, is integrally formed with the diaphragm 1 (horn unit 10), the coil support The body 11 and the diaphragm 1 can be formed thick (thin) as necessary. At this time, the thickness of the diaphragm 1 may be increased over the entire surface, or only a part of the plate thickness may be increased.

Further, as shown in FIG. 5 (c), when the diaphragm 1 having a quadratic or exponential cross-sectional shape from the inner peripheral side to the outer peripheral side is formed, the subtle shape adjustment is performed on the mold. Therefore, there is a possibility that it takes a lot of labor and labor to correct the mold. However, in the manufacturing method of the diaphragm 1 of the present invention using the laser sintering three-dimensional additive manufacturing method, since the mold is not used, it is not necessary to correct the mold, and thus the shape correction is indispensable. Even a complicated shape can be easily formed.
The present invention is not limited to the above-described embodiments, and the shape, structure, material, combination, and the like of each member can be appropriately changed without changing the essence of the invention.

  For example, in the above embodiment, the spherical particles 18 of polypropylene having an average particle diameter of 10 to 100 μm are exemplified as the fine particles of the synthetic resin. However, any synthetic resin may be used as long as it is a thermoplastic resin typified by a polyamide resin such as nylon or a polyester resin such as PET or PEN. Further, in order to increase the rigidity (Young's modulus) of the diaphragm 1, fillers such as carbon, glass, metal nanopowder, and carbon nanofiber can be added to these thermoplastic resins. Further, as the fine particles of the synthetic resin, particles having an average particle diameter of less than 10 μm or particles having an average particle diameter exceeding 100 μm can be used according to the physical characteristics such as Young's modulus and internal loss of the target diaphragm. .

In the said embodiment, the manufacturing method of this invention was demonstrated taking the case where only the diaphragm 1 was shape | molded as an example. However, for example, at least one of the edge 5, the dust cap 14, and the coil support 11 provided adjacent to the diaphragm 1 at the same time as the manufacture of the diaphragm 1 may be formed integrally with the diaphragm 1.
In the above-described embodiment, the manufacturing apparatus 28 that irradiates the carbon dioxide laser to the deposition layer 29 that has been leveled by the roller 25 has been exemplified. However, the type of laser is not limited to a carbon dioxide laser. For example, a semiconductor laser or an infrared laser can be used. Further, the deposited layer 28 may be formed using a member such as a wiper instead of the roller 25.

  In the said embodiment, the example of manufacturing the diaphragm 1 from which a physical characteristic differs by changing the output of a laser was given and the manufacturing method of the diaphragm 1 of this invention was demonstrated. However, for example, in addition to the output of the laser, the physical characteristics of the diaphragm 1 can be changed by changing the laser frequency or the pulse interval in the case of a pulse laser. In addition to the Young's modulus and internal loss, physical characteristics that affect the acoustic performance of the speaker S, such as attenuation rate and sound propagation speed, can be changed.

DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Frame 3 Step part 4 Locking tool 5 Edge 6 Opening part 7 Yoke 8 Magnet 9 Vertical hole 10 Horn part 11 Coil support body 12 Coil 13 Damper 14 Dust cap 15 Front side surface layer 16 Inner layer 17 Back side surface layer 18 Spherical Particles 19 Cavity 20 Right Stage 21 Left Stage 22 Parts Head 23 Through Hole 24 Feeder 25 Roller 26 Laser Gun 27 Irradiation Mirror 28 Manufacturing Equipment 29 Deposited Layer 30 Rib 31 Logo R Rotating Shaft S Speaker

Claims (8)

  A method of manufacturing a speaker diaphragm, comprising forming a speaker diaphragm using a laser sintering three-dimensional additive manufacturing method. In the laser sintering three-dimensional additive manufacturing method, fine particles of synthetic resin are deposited at a constant deposition thickness,
Next, a laser beam is applied to the deposited fine particle layer to form a sintered layer in which the fine particles are sintered,
The method for manufacturing a speaker diaphragm according to claim 1, wherein the sintered layer is formed continuously in a deposition direction.   The method for manufacturing a diaphragm for a speaker according to claim 1 or 2, wherein a diaphragm having different physical characteristics for each surface portion is manufactured by changing the output of the laser.   The method for manufacturing a diaphragm for a speaker according to any one of claims 1 to 3, wherein a diaphragm having different physical characteristics in the thickness direction is manufactured by changing the output of the laser.   The at least one of an edge, a dust cap, a damper, and a coil support disposed adjacent to the diaphragm is formed integrally with the diaphragm simultaneously with the manufacture of the diaphragm. The manufacturing method of the diaphragm of the speaker in any one of 1-4.   6. The method of manufacturing a speaker diaphragm according to claim 1, wherein the synthetic resin fine particles are made of polypropylene spherical particles having an average particle size adjusted to 10 to 100 [mu] m.   6. The method for manufacturing a speaker diaphragm according to claim 1, wherein the synthetic resin fine particles are made of polypropylene spherical particles having an average particle size adjusted to 40 to 70 [mu] m.   The method for producing a speaker diaphragm according to claim 1, wherein the fine particles of the synthetic resin contain a filler that gives rigidity to the sintered layer.

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