JP2004343387A - Speaker, module employing same, and electronic equipment and apparatus employing speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve environmental reliability in a speaker in an acoustic field and an information communication field, and in a speaker module, electronic equipment, and an apparatus employing the same. <P>SOLUTION: In this speaker, a sub-plate 32 connected to a repulsive magnet 31 of a magnetic circuit 24 is constituted so that at least its one part is connected to an upper plate 22, and a magnetic circuit is constituted for the repulsive magnet 31 other than the magnetic circuit formed of a main magnet 21. With this constitution, the operation point of the magnetic circuit of the repulsive magnet 31 can be stably used to reduce demagnetization to a temperature change, thereby improving the environmental reliability. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker, a module using the speaker, an electronic device using the speaker, and an apparatus using the speaker.
[0002]
[Prior art]
A conventional speaker will be described with reference to FIG.
[0003]
FIG. 9 shows a cross-sectional view of a conventional speaker. According to FIG. 9, a yoke 3, a main magnet 1 connected to the inside of the yoke 3, an upper plate 2 connected to a side of the main magnet 1 opposite to the yoke 3, and a repulsion with the main magnet 1. In this direction, another repulsion magnet 11 is coupled to the upper plate 2 on the side opposite to the main magnet 1, and a sub-plate 12 is coupled to the opposite side of the repulsion magnet 11 from the upper plate 2 to form a magnetic circuit. 4.
[0004]
A frame 6 coupled to the yoke 3 of the magnetic circuit 4, a diaphragm 7 coupled to an outer peripheral portion of the frame 6, and a part coupled to the diaphragm 7, And the voice coil 8 arranged in the magnetic gap 5 described above.
[0005]
As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. H11-122695
[Problems to be solved by the invention]
The above-mentioned speaker is often used particularly for information communication equipment and on-vehicle audio equipment, and the market demands for reduction in weight and cost and improvement in environmental reliability have been extremely strong.
[0008]
Conventional speakers of this type are often used for mobile objects such as information communication equipment and on-vehicle audio equipment, and the requirements for their environmental reliability are very strict compared to indoor use in ordinary households. Met. That is, since it is assumed to be used outdoors, heat resistance, cold resistance, and conditions for heat shock are extremely severe.Furthermore, regarding heat resistance, the voice coil at the time of signal input to the speaker besides environmental change conditions. Due to the rise in temperature, the conditions were extremely harsh.
[0009]
In addition, since there is a large demand for weight reduction because it is often used for mobile objects, magnets having a large energy with respect to weight, such as neodymium magnets, have been used very frequently for the types of speaker magnets. Further, since the volume of the magnet to be used is smaller than that of the ferrite type magnet, the heat capacity of the magnetic circuit is reduced, which is disadvantageous from this point of view.
[0010]
Furthermore, this neodymium magnet has a very weak surface due to its properties, heat resistance and cold resistance, and the magnet energy is demagnetized against severe low and high temperature repetitions such as heat shock. As a result, there is a problem in environmental reliability that the sound pressure level of the speaker is reduced.
[0011]
The present invention has been made to solve the above problems, and an object of the present invention is to provide an excellent speaker which can improve environmental reliability of the speaker, and can realize weight reduction and cost reduction.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configurations.
[0013]
The invention according to claim 1 of the present invention includes a yoke, a main magnet coupled to the inside of the yoke, an upper plate coupled to the main magnet on a side opposite to the yoke, A repulsion magnet coupled to the opposite side of the main magnet and repelling the main magnet, and a sub-plate coupled to the opposite side of the repulsion magnet to the upper plate to form a magnetic circuit; , At least a part thereof is connected to the upper plate. Then, a frame coupled to the yoke of the magnetic circuit, a diaphragm coupled to the outer peripheral portion of the frame, and a voice coil coupled to the diaphragm, a part of which is connected to the magnetic gap of the magnetic circuit. They are arranged to form a speaker.
[0014]
With this configuration, in addition to the magnetic circuit composed of the main magnet, a magnetic circuit can be configured for the repulsion magnet, and the operating point of the magnetic circuit of the repulsion magnet can be used in a stable state. , The demagnetization of the speaker can be reduced, the sound pressure level of the speaker can be prevented from lowering, and the environmental reliability can be improved.
[0015]
According to a second aspect of the present invention, the volume of the main magnet coupled to the inside of the yoke is configured to be larger than the volume of the repulsion magnet. With this configuration, it is possible to achieve a well-balanced configuration between the volume of the magnet constituting the magnetic circuit and the leakage magnetic flux and the magnetic flux density, and realize a magnetic circuit with high cost performance.
[0016]
According to a third aspect of the present invention, in the repulsion magnet, the shape of the repulsion magnet is a magnet having a through hole in the center, and a pole made of a magnetic material is inserted into the through hole in the center to form the sub plate and the upper plate. Are combined. With this configuration, the magnetic circuit of the repulsion magnet can be formed through the pole made of a magnetic material provided in the through hole, and the operating point of the magnetic circuit of the repulsion magnet can be used in a stable state, so that the temperature change Can be reduced, and environmental reliability can be improved.
[0017]
According to a fourth aspect of the present invention, the sub-plate and the pole are integrally formed. With this configuration, the number of steps of connecting the sub-plate and the pole can be reduced, and productivity can be improved, so that the cost of the speaker can be reduced.
[0018]
According to a fifth aspect of the present invention, the upper plate and the pole are integrally formed. With this configuration, the number of steps of connecting the upper plate and the pole can be reduced, and productivity can be improved, so that the cost of the speaker can be reduced.
[0019]
According to a sixth aspect of the present invention, the pole is made of a material having a different magnetic permeability from that of the sub-plate. With this configuration, by changing the material of the pole to a material having a high magnetic permeability or a material having a low magnetic permeability, the amount of magnetic flux passing between the sub-plate and the upper plate can be controlled, and the characteristics of the speaker can be adjusted.
[0020]
According to a seventh aspect of the present invention, there is provided a module including at least one of the speakers according to the first to sixth aspects and an electronic circuit. With this configuration, it is possible to reduce the cost of an electronic device or device using the speaker by integrating the speaker and the electronic circuit, by integrating production and distribution, reducing management items, and the like.
[0021]
According to an eighth aspect of the present invention, an electronic apparatus is configured by mounting any one of the speakers according to the first to sixth aspects. With this configuration, the environmental reliability of the electronic device can be improved.
[0022]
According to a ninth aspect of the present invention, an apparatus is configured by mounting any one of the speakers according to the first to sixth aspects. With this configuration, the environmental reliability of the device can be improved.
[0023]
BEST MODE FOR CARRYING OUT 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.
[0024]
(Embodiment 1)
Hereinafter, the first embodiment of the present invention will be described with reference to the first embodiment.
[0025]
1 and 2 are cross-sectional views illustrating a speaker according to Embodiment 1 of the present invention. According to FIG. 1, a yoke 23, a main magnet 21 is connected to the inside of the yoke 23, and an upper plate 22 of the main magnet 21 on the opposite side to the yoke 23 is connected. The repulsion magnet 31 is coupled in the direction of repulsion, and the sub-plate 32 is coupled to the opposite side of the upper plate 22 of the repulsion magnet 31 to form the magnetic circuit 24. Here, at least a part of the sub-plate 32 of the magnetic circuit 24 is connected to the upper plate 22.
[0026]
In the case of the present embodiment, the outer peripheral portion of the sub-plate 32 is extended and connected to the upper plate 22. A frame 26 connected to the yoke 23 of the magnetic circuit 24, a diaphragm 27 connected to the outer periphery of the frame 26, and a part of the magnetic circuit 24 The voice coil 28 is arranged in the magnetic gap 25 to form the speaker 40.
[0027]
FIG. 1 shows an example in which the entire outer peripheral portion of the sub-plate 32 is connected to the upper plate 22.
[0028]
FIG. 2 shows an example in which only a part of the outer peripheral portion of the sub-plate 32 is connected to the upper plate 22.
[0029]
With this configuration, in addition to the magnetic circuit composed of the main magnet 21, a magnetic circuit can be configured for the repulsion magnet 31, and the operating point of the magnetic circuit of the repulsion magnet 31 can be used in a stable state. In addition, it is possible to reduce the demagnetization due to the temperature change, prevent the sound pressure level of the speaker from lowering, and improve the environmental reliability.
[0030]
Further, the invention according to claim 2 is configured such that the volume of the main magnet 21 coupled inside the yoke 23 is larger than the volume of the repulsion magnet 31. Here, as a method of making the volume of the repulsion magnet 31 smaller than the volume of the main magnet 21, there is a method of reducing the outer dimensions of the repulsion magnet 31. In addition, there are a method of reducing the height of the repulsion magnet 31 and a method of making the shape of the repulsion magnet 31 a shape having a hole at the center.
[0031]
With these configurations, it is possible to achieve a well-balanced configuration between the volume of the magnet constituting the magnetic circuit and the leakage magnetic flux and the magnetic flux density. A cost-effective magnetic circuit that can be reduced in size can be realized.
[0032]
(Embodiment 2)
Hereinafter, the second embodiment of the present invention will be described with reference to the third and sixth embodiments.
[0033]
FIG. 3 is a sectional view showing a speaker according to Embodiment 2 of the present invention. The difference from the first embodiment is that the shape of the repulsion magnet 31 is a magnet having a through hole at the center, and a pole 33 made of a magnetic material is inserted into the through hole at the center to form the sub plate 32 and the upper plate. 22.
[0034]
With this configuration, the magnetic circuit of the repulsion magnet 31 can be formed through the pole 33 made of a magnetic material provided in the through hole, and the operating point of the magnetic circuit of the repulsion magnet 31 can be used in a stable state. In addition, it is possible to reduce the demagnetization due to the temperature change, prevent the sound pressure level of the speaker from lowering, and improve the environmental reliability.
[0035]
According to a sixth aspect of the present invention, the pole 33 is made of a material having a different magnetic permeability from that of the sub-plate 32. With this configuration, the amount of magnetic flux passing between the sub-plate 32 and the upper plate 22 can be controlled by changing the material of the pole 33 to a material having a high magnetic permeability or a material having a low magnetic permeability, and the characteristics of the speaker can be freely adjusted. can do.
[0036]
(Embodiment 3)
Hereinafter, the third embodiment of the present invention will be described with reference to the third embodiment.
[0037]
FIG. 4 is a sectional view of a speaker according to Embodiment 3 of the present invention. The difference from the second embodiment is that the sub-plate and the pole are integrated to form the sub-plate with pole 32a. With this configuration, the number of steps of connecting the sub-plate and the pole can be reduced, and productivity can be improved, so that the cost of the speaker can be reduced.
[0038]
(Embodiment 4)
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.
[0039]
FIG. 5 shows a cross-sectional view of a speaker according to Embodiment 4 of the present invention. The difference from the second embodiment is that an upper plate and a pole are integrated to form an upper plate 22a with a pole. With this configuration, the number of steps of connecting the upper plate and the pole can be reduced, and productivity can be improved, so that the cost of the speaker can be reduced.
[0040]
(Embodiment 5)
Hereinafter, the fifth embodiment of the present invention will be described with reference to the fifth embodiment.
[0041]
FIG. 6 is a sectional view showing a speaker module according to Embodiment 5 of the present invention. In this embodiment, a module 44 having at least one of the speakers 40 according to claims 1 to 6 and an electronic circuit 43 in which an electronic component 46 is mounted on a circuit board 45 is configured. With this configuration, the speaker 40 and the electronic circuit 43 are combined to form a speaker module, thereby improving the environmental reliability of electronic devices and devices using the speaker 40 by integrating production and distribution, reducing management items, and the like. And cost reduction.
[0042]
(Embodiment 6)
Hereinafter, a sixth embodiment of the present invention will be described in particular with reference to the eighth embodiment.
[0043]
FIG. 7 is a cross-sectional view illustrating a main part of an electronic device according to Embodiment 6 of the present invention. In this embodiment, a mobile phone as an electronic device is configured by mounting any one of the speakers according to claims 1 to 6. That is, a speaker 40, an electronic circuit 43, and a display unit 47 such as a liquid crystal are mounted on an outer case 48 to constitute a mobile phone 49 as an electronic device. With this configuration, it is possible to improve environmental reliability and reduce costs of a mobile phone as an electronic device.
[0044]
(Embodiment 7)
Hereinafter, a seventh embodiment of the present invention will be described with reference to a seventh embodiment.
[0045]
FIG. 8 is a sectional view showing an apparatus according to Embodiment 7 of the present invention. In the present embodiment, an automobile as an apparatus is provided by mounting any one of the speakers according to the first to sixth aspects. That is, the speaker 40 is mounted on the rear tray of the automobile 50. With this configuration, it is possible to improve the environmental reliability and reduce the cost of the vehicle 50 as the device.
[0046]
【The invention's effect】
As described above, in the present invention, at least a part of the sub-plate of the magnetic circuit is connected to the upper plate. With this configuration, in addition to the magnetic circuit composed of the main magnet, a magnetic circuit can be configured for the repulsion magnet, and the operating point of the magnetic circuit of the repulsion magnet can be used in a stable state. , The demagnetization of the speaker can be reduced, the sound pressure level of the speaker can be prevented from lowering, and the environmental reliability can be improved.
[0047]
Further, the environmental reliability of a speaker module, an electronic device, and a device using the speaker can be similarly improved.
[0048]
As described above, the present invention can provide an excellent speaker capable of realizing improvement in environmental reliability and cost reduction of a speaker, a speaker module, an electronic device, and a device, and the industrial value thereof is extremely large. Things.
[Brief description of the drawings]
1 is a sectional view of a speaker according to a first embodiment of the present invention; FIG. 2 is a sectional view of a speaker according to a first embodiment of the present invention; FIG. 3 is a sectional view of a speaker according to a second embodiment of the present invention; 4 is a sectional view of a speaker according to Embodiment 3 of the present invention. FIG. 5 is a sectional view of a speaker according to Embodiment 4 of the present invention. FIG. 6 is a sectional view of a speaker module according to Embodiment 5 of the present invention. FIG. 8 is a cross-sectional view of an electronic device according to a sixth embodiment of the present invention. FIG. 8 is a cross-sectional view of a device according to a seventh embodiment of the present invention. FIG. 9 is a cross-sectional view of a conventional speaker.
Reference Signs List 1 Main magnet 2 Upper plate 3 Yoke 4 Magnetic circuit 5 Magnetic gap 6 Frame 7 Vibrating plate 8 Voice coil 11 Repulsion magnet 12 Subplate 21 Main magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Vibrating plate 28 Voice coil 31 repulsion magnet 32 sub plate 33 pole 40 speaker 43 electronic circuit 44 speaker module 45 circuit board 46 electronic component 47 display unit 48 outer case 49 mobile phone 50 automobile

Claims (9)

A yoke, a main magnet coupled to the inside of the yoke, an upper plate coupled to a side of the main magnet opposite to the yoke, and a main magnet coupled to a side of the upper plate opposite to the main magnet; A magnetic circuit comprising a repulsion magnet in a direction of repulsion, a sub-plate coupled to the opposite side of the repulsion magnet from the upper plate, a frame coupled to a yoke of the magnetic circuit, and coupled to an outer peripheral portion of the frame. And a voice coil coupled to the diaphragm and partially disposed in a magnetic gap of the magnetic circuit, wherein the sub-plate of the magnetic circuit has at least one of A speaker comprising a part coupled to the upper plate. The speaker according to claim 1, wherein the volume of the main magnet coupled to the inside of the yoke is larger than the volume of the repulsion magnet. 3. The repulsion magnet according to claim 1, wherein the shape of the repulsion magnet is a magnet having a through-hole at the center, and the sub-plate and the upper plate are connected by a pole made of a magnetic material inserted into the through-hole at the center. Speaker. The speaker according to claim 3, wherein the sub-plate and the pole are integrated. 4. The speaker according to claim 3, wherein the upper plate and the pole are integrally formed. 6. The speaker according to claim 3, wherein the pole is made of a material having a different magnetic permeability from that of the sub-plate. A module comprising at least one of the speakers according to claim 1 and an electronic circuit. An electronic device equipped with any one of the speakers according to claim 1. An apparatus equipped with any one of the speakers according to claim 1.

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