JP2005039404A - Voice coil, voice coil integrated diaphragm, speaker using them, and electronic apparatus using the speaker, and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent voice coil adaptable to a high endurance to input level and satisfying downsizing and weight reduction of a speaker with respect to the speaker and the voice coil used for various acoustic apparatuses and information communication apparatuses. <P>SOLUTION: The voice coil of the speaker comprises a coil and a case for covering the coil, and the inside of the case is made vacuum. Since the coil of the voice coil is located under vacuum and brought into a deoxidizing state, the voice coil is not burn out, and the voice coil is configured to satisfying the downsizing and weight reduction of the speaker while realizing a high endurance to input level. Thus, problems of the high endurance to input level, downsizing and weight reduction can be solved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a voice coil used for various acoustic devices, information communication devices, and in-vehicle devices, or a speaker using the same.
[0002]
[Prior art]
A conventional voice coil will be described with reference to FIG.
[0003]
FIG. 12 shows a sectional view of a conventional voice coil.
[0004]
According to FIG. 12, the voice coil 8 is configured by winding the magnet wire 12 to form the wire ring 10.
[0005]
Here, the magnet wire 12 has a core material 13 at the center thereof, an insulating coating 14 provided on the outer periphery thereof, and a fusion coating 15 provided on the outer periphery thereof. The fusion coating 15 is wound while being melted with a solvent such as alcohol. Therefore, when the solvent evaporates and dries, not only the wire ring 10 but also the bobbin is present, the bonding of the wire ring 10 and the bobbin is completed.
[0006]
In particular, in the case of a voice coil compatible with high input resistance, the voice coil 8 is configured using a heat-resistant grade magnet wire.
[0007]
Furthermore, the heat-resistant voice coil is then heat-cured to thermally cure the coating, thereby improving the heat resistance.
[0008]
Further, as a method for further improving heat resistance as a speaker using a heat-resistant voice coil, there is a method in which a heat dissipation liquid having a large thermal conductivity is filled in a magnetic gap (for example, see Patent Document 1).
[0009]
[Patent Document 1]
JP 55-16546 A (Patent No. 1148700)
[0010]
[Problems to be solved by the invention]
The above-mentioned speaker is used for portable information communication devices, especially those using a voice coil with a bobbin are used in mini-components and in-vehicle audio devices, and large ones are used in concert halls and outdoor live stages. Often used in professional audio equipment.
[0011]
These speakers and speaker systems have recently been strongly demanded to reduce their size and weight. On the other hand, in order to increase the output, there is a growing demand for higher input resistance especially for speakers.
[0012]
For this reason, the size of the speaker and the voice coil has to be reduced, but there is a conflicting problem that high input resistance must be realized.
[0013]
That is, by reducing the size of the voice coil and increasing the temperature rise value of the voice coil due to the deterioration of the heat dissipation, the risk of burning of the voice coil is increased. Further, in addition to this state, a larger input than before is applied to the speaker for the purpose of increasing the output of the device.
[0014]
In such a state, the voice coil to which a large input is applied causes the phenomenon of combustion due to the generation of Joule heat, and the wire ring and bobbin combine with oxygen in the air. The loudspeakers, such as loosening, thermal fusing of wires, and combustion of bobbins, led to destruction.
[0015]
As measures against this, even if measures such as improving the heat resistance of the coating or using a magnet wire with a large wire diameter are taken, the temperature has already reached the limit, exceeding the heat resistance limit of the voice coil. As the value increased, burnout due to the fluctuation of the voice coil wire ring and thermal fusing of the wire material occurred.
[0016]
This is a problem that arises from the market background in which the high heat-resistant grade coating used and the high input that gives a temperature rise value exceeding the heat resistance temperature of the wire must be applied.
[0017]
The present invention solves the above-described problems, and provides an excellent voice coil and speaker that can cope with high input resistance and can satisfy the reduction in size and weight of the speaker.
[0018]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration.
[0019]
The invention described in claim 1 of the present invention is a voice coil comprising a wire ring and a case covering the wire ring, wherein the voice coil is constituted by making the inside of the case in a vacuum or low pressure state. is there.
[0020]
With this configuration, since the voice coil wire is placed in a deoxygenated state at a vacuum or low pressure, the phenomenon of combining with oxygen called combustion is less likely to occur, and the temperature up to the occurrence of burnout, that is, thermal fusing and wire ring breakage is reduced. Can be improved. Therefore, it is possible to satisfy the reduction in size and weight of the speaker while realizing high input resistance.
[0021]
In addition, since the voice coil wire is placed in a deoxygenated state under vacuum or low pressure, it is difficult for the heat to be transmitted to the outside, so that it is possible to prevent thermal deterioration and burnout of other parts constituting the speaker.
[0022]
According to a second aspect of the present invention, a voice coil is formed by providing a bobbin on a wire ring. With this configuration, since the voice coil has a bobbin, the occurrence of wire ring breakage can be further reduced, and high input resistance can be realized.
[0023]
According to a third aspect of the present invention, the wire ring is formed by winding a wire, and the voice coil is configured by forming the wire ring without contacting each other. With this configuration, it is possible to prevent the voice coil from being rarely short-circuited even if the insulating coating is broken due to a temperature rise.
[0024]
Furthermore, a wire ring can also be comprised using the wire without an insulation film. With this configuration, the cost of the voice coil can be reduced.
[0025]
According to a fourth aspect of the present invention, a voice coil is configured by providing an insulating bobbin for each wire ring. With this configuration, it is possible to prevent the voice coil from being rarely short-circuited even if the insulating coating is broken due to a temperature rise.
[0026]
In addition, it is possible to prevent the voice coil from being broken.
[0027]
Furthermore, a wire ring can also be comprised using the wire without an insulation film, and the wire without a fusion coating. With this configuration, the cost of the voice coil can be further reduced.
[0028]
According to a fifth aspect of the present invention, a voice coil is formed by using a bobbin as a glass-based material. With this configuration, the heat resistance of the bobbin can be improved.
[0029]
According to a sixth aspect of the present invention, a voice coil is formed by using a bobbin as a ceramic material. With this configuration, the heat resistance of the bobbin can be further improved.
[0030]
According to a seventh aspect of the present invention, a voice coil is formed by interposing a material having high heat insulation properties between a wire ring and a part in contact with the wire ring. With this configuration, the heat generated from the wire ring of the voice coil is less likely to be transmitted to the parts that are in contact with the wire ring, so that it is possible to prevent thermal deterioration and burnout of other parts constituting the speaker.
[0031]
According to an eighth aspect of the present invention, the voice coil is formed of a glass-based material for the case. With this configuration, the heat resistance of the case can be improved.
[0032]
According to a ninth aspect of the present invention, the voice coil is formed of a ceramic material for the case. With this configuration, the heat resistance of the case can be further improved.
[0033]
According to a tenth aspect of the present invention, a voice coil is formed by forming a bobbin with a part of a case. With this configuration, the productivity of the speaker can be improved by reducing the number of parts and the number of production steps.
[0034]
According to an eleventh aspect of the present invention, a voice coil integrated diaphragm is formed by integrally forming a diaphragm in a part of a case. With this configuration, the productivity of the speaker can be improved by reducing the number of parts and the number of production steps.
[0035]
According to a twelfth aspect of the present invention, a speaker is configured by using any one of the voice coils or the voice coil integrated diaphragm according to the first to eleventh aspects. With this configuration, it is possible to satisfy a reduction in size and weight while realizing high input resistance of the speaker.
[0036]
In a thirteenth aspect of the present invention, a speaker is configured through a material having high heat insulation between a bobbin or case in contact with a wire ring and a component coupled to the bobbin or case. Is. This configuration makes it difficult for the heat of the bobbin or case to be transmitted to other parts, so it is possible to prevent thermal deterioration and burnout of other parts that make up the speaker, and to achieve higher input resistance of the speaker. Can do.
[0037]
According to a fourteenth aspect of the present invention, an electronic apparatus includes the speaker according to any one of the twelfth and thirteenth aspects and an amplifying unit for an electric signal input to the speaker. . With this configuration, it is possible to obtain an electronic device that achieves high input resistance of the speaker.
[0038]
According to a fifteenth aspect of the present invention, the apparatus is configured by mounting any one of the loudspeakers according to the twelfth and thirteenth aspects on a moving means.
[0039]
With this configuration, it is possible to obtain a device that realizes high input resistance of the speaker.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the same content, the description is abbreviate | omitted and demonstrated.
[0041]
(Embodiment 1)
Hereinafter, the first aspect of the present invention will be described with reference to the first embodiment.
[0042]
FIG. 1 is a sectional view showing a voice coil according to an embodiment of the present invention.
[0043]
According to FIG. 1, a voice coil 28 is constituted by a wire ring 30 and a case 31 covering the wire ring 30. The inside of the case 31 is hermetically sealed and is in a vacuum or low pressure state.
[0044]
Here, an example of the wire ring 30 without the bobbin is shown, but the wire ring 30 supports the position inside the case 31 by connecting the upper end portion and the lower end portion thereof to the case 31. The support method is not limited to the present embodiment, and the position of the wire ring 30 and the case 31 is fixed, such as using the inner side surface of the case 31 instead of the bobbin, and the driving force of the wire ring 30 is simple. If the fixing method does not deviate, the function can be satisfied.
[0045]
Only the lead wire is drawn out of the case 31. In this case, the lead wire may be drawn out directly or may be drawn out through an electrode portion provided in a part of the case.
[0046]
With this configuration, the wire ring 30 of the voice coil 28 is inside the sealed case 31, and the inside of the case 31 is placed in a deoxygenated state under vacuum or low pressure. The temperature until the occurrence of thermal fusing and wire ring breakage can be improved, and high input resistance can be realized.
[0047]
Furthermore, this structure can satisfy the reduction in size and weight of the speaker.
[0048]
The phenomenon that the wire ring 30 of the voice coil 28 is burned out is caused by combustion, and this combustion is caused by combining with oxygen. Therefore, the wire ring 30 is in a deoxygenated state or a low oxygen state. By placing it in, it is possible to significantly reduce the occurrence of combustion.
[0049]
In addition, the wire ring 30 of the voice coil 28 is inside a sealed case 31 and is placed in a deoxygenated state under vacuum, so that the heat is not easily transmitted to the outside. It is also possible to prevent thermal deterioration and burnout.
[0050]
For the reasons described above, it is possible to increase the input resistance of the speaker. Therefore, since the heat capacity of the magnetic circuit that absorbs the heat generated from the wire ring 30 of the voice coil 28 can be reduced, the size of the speaker can be reduced. Weight reduction can be satisfied.
[0051]
Further, the form of the voice coil is not limited to the above-described form, and can be applied to a planar voice coil, a printed coil, a voice coil formed by etching, or the like.
[0052]
(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.
[0053]
FIG. 2 is a cross-sectional view showing a voice coil according to an embodiment of the present invention.
[0054]
According to FIG. 2, the voice coil 28 is configured by providing the bobbin 36 on the wire ring 30.
[0055]
With this configuration, the voice coil 28 has the bobbin 36. By winding the bobbin 36 on the bobbin 36, the wire ring 30 is always supported by the bobbin 36 and a large contact area can be secured. It is difficult to achieve high input resistance.
[0056]
Since other configurations are the same as those in the first embodiment, the description thereof is omitted.
[0057]
(Embodiment 3)
The third embodiment of the present invention will be described below in particular.
[0058]
FIG. 3 is a cross-sectional view showing a voice coil according to an embodiment of the present invention.
[0059]
According to FIG. 3, the wire ring 30 is formed by winding a wire rod 37, and constitutes the voice coil 28 without bringing the wire rods 37 into contact with each other. With this configuration, it is possible to prevent the occurrence of a rare short of the wire ring 30 of the voice coil 28 even if the insulating coating is broken due to a temperature rise.
[0060]
Furthermore, the wire ring 30 can also be configured using a wire without an insulating coating. With this configuration, the cost of the voice coil 28 can be reduced.
[0061]
(Embodiment 4)
The fourth embodiment of the present invention will be described below with reference to the fourth embodiment.
[0062]
FIG. 4 is a cross-sectional view showing a voice coil according to an embodiment of the present invention.
[0063]
According to FIG. 4, the voice coil 28 is configured by providing an insulating bobbin 36 </ b> A for each layer of the wire ring 30. With this configuration, it is possible to prevent the voice coil 28 from being short-circuited even if the insulating coating is broken due to a temperature rise.
[0064]
Further, even if a driving force is applied to the wire ring 30 of the voice coil 28 by the insulating bobbin 36A, the wire ring 30 is firmly guided by the insulating bobbin 36A, so that the wire ring 30 is prevented from being scattered. You can also
[0065]
Furthermore, the wire ring 30 can also be configured using a wire without an insulating coating or a wire without a fusion coating. With this configuration, the cost of the voice coil 28 can be further reduced.
[0066]
(Embodiment 5)
Hereinafter, the fifth and sixth aspects of the present invention will be described using the fifth embodiment.
[0067]
In the present invention, the basic configuration is the same as described above, and the drawings are omitted. However, claim 5 is configured by forming a voice coil using a bobbin as a glass-based material.
[0068]
The sixth aspect of the present invention comprises a voice coil using a bobbin as a ceramic material.
[0069]
In this way, by configuring the voice coil using the bobbin as a glass-based material or a ceramic-based material, the heat resistance of the bobbin can be improved, and a voice coil for high input resistance can be realized.
[0070]
(Embodiment 6)
The sixth aspect of the present invention will be described below with reference to the sixth embodiment.
[0071]
FIG. 5 is a cross-sectional view showing a voice coil according to an embodiment of the present invention.
[0072]
According to FIG. 5, the wire coil 30 and the parts in contact with the wire ring 30, that is, in the case of this embodiment, the case 31 is formed. 28 is configured. With this configuration, the heat generated from the wire ring 30 of the voice coil 28 is thermally blocked by the material 38 having high heat insulating properties and is difficult to be transmitted to the case 31, so that the other components constituting the speaker are thermally deteriorated or burned out. Can be prevented.
[0073]
(Embodiment 7)
Hereinafter, the eighth and ninth aspects of the present invention will be described using the seventh embodiment.
[0074]
In the present invention, the basic configuration is the same as described above, and the drawings are omitted. However, claim 8 is a configuration in which a voice coil is formed using a glass-based material as a case in which the inside is vacuumed.
[0075]
According to a ninth aspect of the present invention, a voice coil is formed by using a ceramic material as a case that is configured in a vacuum state.
[0076]
In this way, by configuring the voice coil as a glass-based material or a ceramic-based material with the case configured in a vacuum state, the heat resistance of the case can be improved, and the voice coil for high input resistance Can be realized.
[0077]
(Embodiment 8)
The invention according to claim 10 of the present invention will be described below using the eighth embodiment.
[0078]
FIG. 6 is a cross-sectional view showing a voice coil according to an embodiment of the present invention.
[0079]
According to FIG. 6, the voice coil 28 is configured by forming the bobbin 36 with a part of the case 31 configured to be in a vacuum state. With this configuration, the voice coil 28 and the diaphragm can be coupled using the bobbin 36, and the productivity of the speaker can be improved by reducing the number of components and the number of production steps.
[0080]
(Embodiment 9)
The ninth aspect of the present invention will be described below with reference to the ninth embodiment.
[0081]
FIG. 7 is a cross-sectional view showing a voice coil integrated diaphragm according to an embodiment of the present invention.
[0082]
According to FIG. 7, the voice coil integrated diaphragm 29 is formed by integrally forming the diaphragm 27 in a part of the case 31 of the voice coil 28 configured to be in a vacuum state.
[0083]
With this configuration, the productivity of the speaker can be improved by reducing the number of parts and the number of production steps.
[0084]
In addition, by integrating the voice coil and the diaphragm, vibration transmission loss at the coupling portion between the voice coil and the diaphragm can be reduced, and the characteristics of the speaker can be improved.
[0085]
(Embodiment 10)
Hereinafter, the tenth aspect of the present invention will be described using the tenth embodiment.
[0086]
FIG. 8 is a cross-sectional view of a speaker using a voice coil according to an embodiment of the present invention.
[0087]
According to FIG. 8, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to form a magnetic circuit 24. A frame 26 is coupled to the yoke 23 of the magnetic circuit 24, and a diaphragm 27 is coupled to the peripheral edge of the frame 26. The voice coil 28 described above is coupled to the central portion of the diaphragm 27, and the voice coil 28 is inserted into the magnetic gap 25 of the magnetic circuit 24 to constitute a speaker.
[0088]
By adopting this configuration, it is possible to realize a speaker that can achieve a reduction in size and weight while achieving high input resistance.
[0089]
(Embodiment 11)
Hereinafter, the eleventh aspect of the present invention will be described using the eleventh embodiment.
[0090]
FIG. 9 is a cross-sectional view of a speaker using a voice coil according to an embodiment of the present invention.
[0091]
Only the differences from the tenth embodiment will be described. As shown in FIG. 9, a speaker is formed between a diaphragm 27 and a case 31 of the voice coil 28 via a material 39 having high heat insulating properties. With this configuration, the heat of the case 31 is not easily transmitted to the diaphragm 27, so that thermal deterioration and burning of the diaphragm 27 can be prevented.
[0092]
By adopting this configuration, it is possible to realize a speaker that can be further reduced in size and weight while achieving further high input resistance.
[0093]
(Embodiment 12)
The invention according to claim 14 of the present invention will be described below using Embodiment 12.
[0094]
FIG. 10 is an external view of an audio mini-component system that is an electronic apparatus according to an embodiment of the present invention.
[0095]
As shown in FIG. 10, the speaker 40 of the present invention is incorporated in an enclosure 41 to constitute a speaker system, and an amplifier 42 which is an amplifying means for an electric signal input to the speaker, and a source input to the amplifier 42 And an audio mini component system 44 that is an electronic device.
[0096]
With this configuration, it is possible to achieve high output, miniaturization, and weight reduction of an electronic device such as a mini component system.
[0097]
(Embodiment 13)
Hereinafter, the thirteenth aspect of the present invention will be described using the thirteenth embodiment.
[0098]
FIG. 11 shows a cross-sectional view of an automobile 50 which is an apparatus provided with moving means according to an embodiment of the present invention.
[0099]
As shown in FIG. 11, an automobile 50 is configured by incorporating the speaker 40 of the present invention into a rear tray.
[0100]
With this configuration, it is possible to achieve high input resistance, miniaturization, and weight reduction of the speaker 40 mounted on the automobile 50.
[0101]
Thereby, performance improvement, size reduction, and weight reduction of apparatuses, such as a motor vehicle 50, can be enabled.
[0102]
【The invention's effect】
As described above, according to the present invention, the voice coil is constituted by the wire ring and the case covering the wire ring, and the inside of the case is formed in a vacuum state or a low pressure state. With this configuration, the voice coil wire is not burned because it is placed in a deoxygenated state in a vacuum, and it is possible to satisfy the reduction in size and weight of the speaker while achieving high input resistance.
[0103]
Further, since the voice coil wire is placed in a deoxygenated state in a vacuum, the heat is not easily transmitted to the outside, so that it is possible to prevent thermal deterioration and burnout of other components constituting the speaker.
[0104]
As described above, the present invention can provide an excellent voice coil and speaker that can cope with high input resistance and can be reduced in size and weight, and its industrial value is very large.
[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 sectional view showing a voice coil integrated diaphragm according to an embodiment of the present invention. FIG. 8 is a sectional view of a speaker using the voice coil according to an embodiment of the present invention. 9 is a cross-sectional view of a speaker using a voice coil according to an embodiment of the present invention. FIG. 10 is a cross-sectional view of an electronic device using the speaker according to an embodiment of the present invention. Using a speaker of the form Sectional view FIG. 12 is a cross-sectional view of a conventional voice coil EXPLANATION OF REFERENCE NUMERALS
8 Voice coil 10 Wire ring 12 Magnet wire 13 Wire 14 Insulating coating 15 Fusion coating 21 Magnet 22 Upper plate 23 York 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 28 Voice coil 29 Voice coil integrated diaphragm 30 Wire ring 31 Case 36 Bobbin 36A Bobbin 37 Wire ring 38 Heat insulating material 39 Heat insulating material 40 Speaker 41 Enclosure 42 Amplifier 43 Player 44 Mini component system 50 Automobile

Claims (15)

A voice coil comprising at least a wire ring and a case covering the wire ring, wherein the inside of the case is formed in a vacuum or low pressure state. 2. The voice coil according to claim 1, wherein a bobbin is provided on the wire ring. The voice coil according to claim 1, wherein the wire ring is formed by winding a wire, and the wire ring is formed without bringing the wire members into contact with each other. 4. The voice coil according to claim 1, wherein an insulation bobbin is provided for each layer of the wire ring. The voice coil according to claim 1, wherein the bobbin is made of a glass-based material. 5. The voice coil according to claim 1, wherein the bobbin is made of a ceramic material. The voice coil according to any one of claims 1 to 6, wherein the voice coil is configured by interposing a material having high heat insulating properties between the wire ring and a part in contact with the wire ring. 8. The voice coil according to claim 1, wherein the case is made of a glass-based material. 8. The voice coil according to claim 1, wherein the case is made of a ceramic material. The voice coil according to claim 1, wherein a bobbin is formed in a part of the case. 11. The voice coil integrated diaphragm according to claim 1, wherein the diaphragm is integrally formed in a part of the case. A speaker using the voice coil or the voice coil integrated diaphragm according to any one of claims 1 to 11. The speaker according to claim 12, wherein a material having high heat insulating properties is interposed between a bobbin or case in contact with the wire ring and a part coupled to the bobbin or case. An electronic apparatus comprising: the speaker according to any one of claims 12 and 13; and means for amplifying an electric signal input to the speaker. An apparatus in which the speaker according to any one of claims 12 and 13 is mounted on a moving means.

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