JP4134688B2 - Voice coil, manufacturing method thereof, and speaker using voice coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a voice coil used for various acoustic devices and information communication devices, a method for manufacturing the same, and a speaker using the voice coil.
[0002]
[Prior art]
In recent years, speakers are often used in portable information communication devices, and in particular, there is a strong demand for miniaturization and weight reduction.
[0003]
A conventional voice coil will be described.
[0004]
FIG. 8 is a sectional view of a conventional voice coil, and FIG. 9 is a perspective view showing a manufacturing process of the conventional voice coil.
[0005]
According to FIG. 8, the voice coil 8 is configured by winding the wire ring 10 around the outside of the bobbin 9.
[0006]
A method for manufacturing the voice coil 8 will be described with reference to FIG. First, the bobbin 9 is chucked on the voice coil winding jig 11 (FIG. 9A), and then the magnet wire 12 is wound around the outer periphery of the bobbin 9 (FIG. 9B). To form the voice coil 8 (FIG. 9C).
[0007]
Here, the magnet wire 12 is wound while the fusion coating is melted with a solvent such as alcohol. Therefore, when this solvent evaporates and dries, not only the wire ring 10 but also the bonding of the wire ring 10 and the bobbin 9 is completed. Further, the heat resistance of the voice coil for heat resistance is improved by heat curing thereafter.
[0008]
As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
[0009]
[Patent Document 1]
Japanese Patent Laid-Open No. 63-261996 [0010]
[Problems to be solved by the invention]
The above-described speaker has a configuration in which a bobbin 9 is provided in order to improve the strength of the voice coil 8 in response to a demand for high input resistance.
[0011]
However, when the bobbin 9 is provided for high input resistance, the diameter of the voice coil 8 is further increased by winding the bobbin 9 on the material thickness and the outer periphery of the bobbin 9. When the diameter of the voice coil 8 is increased, the size of the magnetic circuit is increased, and as a result, the outer shape of the speaker is increased.
[0012]
Moreover, since the diameter of the voice coil 8 is increased, the size of the magnetic gap is also increased. Therefore, if a magnet having the same volume is used, the magnetic flux density is reduced and the sound pressure level of the speaker is reduced. It also has the problem of letting it go.
[0013]
Therefore, the present invention solves the above-described problem, and can achieve downsizing of a speaker in a configuration provided with a bobbin and a wire ring for high input resistance, and can prevent a decrease in sound pressure level. A voice coil and a speaker are provided.
[0014]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 of the present invention is a voice coil that includes at least a bobbin and a wire ring, and the wire ring is provided inside the bobbin. With this configuration, the voice coil has a bobbin to achieve high input resistance, and by providing a wire ring inside the bobbin, while ensuring a diaphragm of the same size, the maximum outer shape including the voice coil Can be reduced, and the downsizing of the speaker can be satisfied.
[0015]
Furthermore, by configuring the bobbin material thickness so that only the part where the wire ring is provided is thinner than the other parts, the ratio of the bobbin occupying the magnetic gap can be reduced, so the magnetic gap can be made smaller, etc. The density can be improved.
[0016]
According to a second aspect of the present invention, there is provided a voice coil in which the voice coils according to the first aspect are stacked and coupled in a stack of at least two layers. The driving force of the speaker can be improved by configuring the voice coil with two or more layers.
[0017]
The invention according to claim 3 of the present invention is the voice coil according to claim 2, wherein one layer of the wire ring abuts against an end face of the bobbin. Since the voice coil has a configuration of two or more layers and one layer of the wire ring is configured to abut against the end face of the bobbin, the driving force of the speaker and the density of the voice coil can be improved.
[0018]
Invention of Claim 4 of this invention is a voice coil as described in any one of Claims 1-3 which comprised the wire ring as a flat wire. With this configuration, the density of the wire ring of the voice coil can be improved, and the space factor in the magnetic gap can be improved.
[0019]
The invention according to claim 5 of the present invention is the voice coil integrated diaphragm according to any one of claims 1 to 4 , wherein the bobbin and the diaphragm are integrated. With this configuration, the vibration of the voice coil can be transmitted to the diaphragm without transmission loss, and the coupling accuracy, coupling strength, and productivity of the diaphragm and the voice coil can be improved.
[0020]
The invention according to claims 6 to 9 of the present invention is the method for manufacturing a voice coil according to any one of claims 1 to 5 . With this manufacturing method, it is possible to manufacture a voice coil with a maximum outer shape reduced while securing a diaphragm having the same size. Therefore, the downsizing of the speaker can be satisfied.
[0021]
The invention according to claim 10 of the present invention is the method for manufacturing a voice coil according to any one of claims 6 to 9 , wherein the bobbin and the wire ring are pressure-coupled. With this manufacturing method, it is possible to obtain a voice coil in which the coupling strength between the bobbin and the wire ring is further improved. Furthermore, by applying a strong pressure, the bobbin and the wire ring are deformed, so that the density can be improved, and the proportion of the voice coil in the magnetic gap can be reduced. The density can be improved.
[0022]
The invention according to claim 11 of the present invention is a method of manufacturing a voice coil according to the adhesive to claim 6-9 configured is applied between the bobbin and Senwa. By this manufacturing method, since the adhesive force of the adhesive is applied, it is possible to obtain a voice coil that further improves the bonding strength between the bobbin and the wire ring.
[0023]
The invention described in claims 12 and 13 of the present invention is a speaker using the voice coil according to any one of claims 1 to 4 or the voice coil integrated diaphragm according to claim 5 . With this configuration, it is possible to obtain a speaker that can achieve miniaturization while realizing high input resistance.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Hereinafter, the first aspect of the present invention will be described with reference to the first embodiment.
[0025]
1 and 4 are sectional views showing a voice coil according to an embodiment of the present invention.
[0026]
As shown in FIG. 1, the present embodiment has a configuration in which a wire ring 30 is provided inside a bobbin 29. And as shown in FIG. 4, the bobbin 29 is comprised with one soft material, and only the part provided with the wire ring 30 is made into pressure deformation by applying a big tension, and is comprised thinner than another part. .
[0027]
With this configuration, the voice coil 28 has the bobbin 29 to achieve high input resistance, and by providing the wire ring 30 inside the bobbin 29, the voice coil 28 can be secured while securing a diaphragm of the same size. Therefore, the size of the magnetic circuit 24 can be reduced. As a result, the reduction in size and weight of the speaker can be satisfied.
[0028]
And since the ratio of the bobbin 29 in a magnetic gap can be reduced and a magnetic gap can be comprised small, a magnetic flux density improvement can be aimed at.
[0029]
(Embodiment 2)
Next, the second aspect of the present invention will be described with reference to the second aspect of the present invention.
[0030]
As shown in FIG. 2, in the present embodiment, the voice coil 28A is configured by winding the wire ring 30 in two layers. With this configuration, the voice coil 28 </ b> A can improve the driving force of the speaker by configuring the wire ring 30 to have two or more layers. Here, the present embodiment shows the two-layer winding of the wire ring 30, but the number of layers is increased and further driving is performed, such as three-layer winding, four-layer winding, five-layer winding, and six-layer winding. You can also improve your power.
[0031]
Since other contents are the same as those in the first embodiment, description thereof is omitted.
[0032]
(Embodiment 3)
Next, the third aspect of the present invention will be described, particularly regarding the invention according to the third aspect of the present invention.
[0033]
As shown in FIG. 3, the present embodiment is configured such that one layer of the wire ring is abutted against the end surface of the bobbin 29 and the other wire ring 30 is provided inside the bobbin 29. With this configuration, the voice coil 28B can have a configuration in which the wire ring 30 has two or more layers, and since one layer of the wire ring 30 is abutted against the end face of the bobbin 29, the voice coil 28B The density in the magnetic gap can be improved, and the driving force can be further improved.
[0034]
Since other contents are the same as those in the first embodiment, description thereof is omitted.
[0035]
(Embodiment 4 )
The fourth embodiment of the present invention will be described below with reference to the fourth embodiment.
[0036]
In the present embodiment, the basic configuration is the same as described above, and thus the drawing is omitted. However, the voice coil or the voice coil integrated diaphragm is configured with the wire ring as a rectangular wire. With this configuration, the density of the wire ring of the voice coil can be improved, and the space factor in the magnetic gap can be improved.
[0037]
(Embodiment 5 )
Hereinafter, with reference to the fifth embodiment will be described the invention described in particular claim 5 of the present invention.
[0038]
FIG. 5 is a cross-sectional view showing a voice coil according to an embodiment of the present invention.
[0039]
As shown in FIG. 5, in this embodiment, a bobbin 29 and a diaphragm 27 are integrated to form a voice coil integrated diaphragm 27A. With this configuration, the vibration of the voice coil 28 can be transmitted to the diaphragm 27 without transmission loss, and the coupling accuracy, coupling strength, and productivity of the diaphragm 27 and the voice coil 28 can be improved.
[0040]
(Embodiment 6 )
Hereinafter, with reference to the sixth embodiment will be described in particular the invention described in claims 6 to 9 of the present invention.
[0041]
FIG. 6 is a perspective view showing a manufacturing process of the voice coil according to the embodiment of the present invention.
[0042]
First, the magnet wire 52 is wound around the voice coil winding jig 51 to form the wire ring 30 (FIG. 6A). Next, after the bobbin 29 is installed on the outer periphery of the wire ring 30 and chucked (FIG. 6 (b)), only the portion where the wire ring of the bobbin is provided is subjected to pressure deformation so that it is thinner than the other portions. Then, the bobbin is detached from the winding jig to form the voice coil 28 (FIG. 6C). Here, the magnet wire 52 is wound while the fusion coating is melted with a solvent such as alcohol. Therefore, when the solvent evaporates and dries, not only the wire ring 30 but also the bonding of the wire ring 30 and the bobbin 29 is completed. Further, the heat resistance of the voice coil for heat resistance is improved by heat curing thereafter.
[0043]
(Embodiment 7 )
Next, the manufacturing method of Claim 10 is demonstrated. Although not shown, this is a manufacturing method in which the bobbin 29 and the wire ring 30 are pressure-bonded to the manufacturing methods of claims 6 to 9 . A magnet wire 52 is wound around a voice coil winding jig 51 to form a wire ring 30, and a bobbin 29 is installed on the outer periphery of the wire ring 30 for chucking. Next, the bobbin 29 and the wire ring 30 are pressure-bonded by a pressure jig. As for the pressurizing jig, a semicircular cylindrical split jig in which a circular cylindrical mold is divided in half is used so that the entire bobbin 29 and the wire ring 30 can be pressurized. Pressurized.
[0044]
With this manufacturing method, it is possible to obtain the voice coil 28 in which the coupling strength between the bobbin 29 and the wire ring 30 is further improved. Furthermore, since the density between the bobbin 29 and the wire ring 30 is improved by applying a strong pressure, the ratio of the voice coil 28 in the magnetic gap can be reduced, and the magnetic gap can be made smaller. Improvements can be made.
[0045]
(Embodiment 8 )
Next, the manufacturing method of Claim 11 is demonstrated. Although not shown in the drawings, this is a voice coil manufacturing method formed by applying an adhesive between the bobbin 29 and the wire ring 30 to the manufacturing methods of claims 6 to 9 . In the basic manufacturing method, when the wire ring 30 and the bobbin 29 are joined, and when the bobbin 29 and the wire ring 30 are joined, an adhesive is applied between them to form the voice coil 28. Here, the surface of the winding jig 51 is processed so that it is difficult to adhere so that the bobbin 29 can be taken out immediately.
[0046]
By this manufacturing method, the voice coil 28 in which the bonding strength between the bobbin 29 and the wire ring 30 is further improved can be obtained by applying the adhesive force of the adhesive.
[0047]
(Embodiment 9 )
Hereinafter, the ninth embodiment of the present invention, particularly, the inventions described in claims 12 and 13 will be described.
[0048]
FIG. 7 is a cross-sectional view of a speaker using a voice coil according to an embodiment of the present invention.
[0049]
According to FIG. 7, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to constitute a magnetic circuit 24. A voice coil 28 coupled so as to fit in the magnetic gap 25 of the magnetic circuit 24 is integrated with a diaphragm 27, and an outer peripheral portion of the diaphragm 27 is fixed by a frame 26.
[0050]
With this configuration, it is possible to obtain a speaker that can achieve a reduction in size and weight while achieving high input resistance.
[0051]
【The invention's effect】
As described above, according to the present invention, in the voice coil composed of the bobbin and the wire ring, the wire coil is provided on the inner side of the bobbin, and the material thickness of the bobbin is different from that of the other part only in the portion where the wire ring is provided. Thinly configured . With this configuration, the voice coil has a bobbin to achieve high input resistance, and by providing a wire ring inside the bobbin, while ensuring a diaphragm of the same size, the maximum outer shape including the voice coil is achieved. Since it can be made smaller, it is possible to satisfy the downsizing of the speaker. Furthermore, since the ratio of the bobbin in the magnetic gap can be reduced, the magnetic flux density can be improved, for example, the magnetic gap can be made smaller.
[0052]
According to the present invention, it is possible to provide an excellent voice coil and speaker capable of realizing high performance and downsizing.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a voice coil according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a voice coil according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a voice coil according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of a voice coil according to an embodiment of the present invention. FIG. 7 is a perspective view showing a manufacturing process of a voice coil according to an embodiment of the present invention. FIG. 7 is a sectional view of a speaker using the voice coil according to an embodiment of the present invention. (A) to (c) are perspective views showing the manufacturing process of a conventional voice coil.
28 Voice coil 29 Bobbin 30 Wire ring

Claims (13)

A voice coil comprising at least a bobbin and a wire ring and provided with the wire ring inside the bobbin, wherein the bobbin is made of one soft material and provided with the wire ring of the soft bobbin. A voice coil that is configured to be thinner than other parts by pressure-deforming only parts .   The voice coil according to claim 1, wherein the voice coil is composed of at least two-layer windings.   The voice coil according to claim 2, wherein at least one layer of the wire ring is abutted against the end face of the bobbin. The voice coil according to any one of claims 1 to 3 which constitutes a Senwa as flat wire. The voice coil according to any one of claims 1-4 configured by integrally with the bobbin and the diaphragm. A wire ring is formed by winding a magnet wire around a voice coil winding jig. Next, a bobbin is chucked on the outer periphery of this wire ring, and then only the portion of the bobbin where the wire ring is provided is pressurized and deformed. A method for manufacturing a voice coil, which is formed thinner than the other portions, and then formed by detaching the bobbin from the winding jig. The method for manufacturing a voice coil according to claim 6, wherein a wire ring of at least two layers is formed. 7. The method of manufacturing a voice coil according to claim 6, wherein at least one layer of the wire ring is abutted against the end face of the bobbin. The method for manufacturing a voice coil according to any one of claims 6 to 8 , wherein the wire ring is formed as a flat wire. The method for manufacturing a voice coil according to any one of claims 6 to 9 , wherein the bobbin and the wire ring are pressure-coupled. The method for manufacturing a voice coil according to any one of claims 6 to 10 , wherein an adhesive is applied between the bobbin and the wire ring. The speaker using the voice coil as described in any one of Claims 1-4 . A speaker using the voice coil integrated diaphragm according to claim 5 .

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