JP2007158643A - Speaker and speaker driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To thin a speaker, to effectively utilize a magnetic flux from a magnet constituting the speaker, and to improve the efficiency and acoustic characteristics of the speaker. <P>SOLUTION: The speaker comprises: magnet units 2 and 3 provided with plane boards 2a and 3a and the plurality of magnets 2b and 3b arranged on one surface of the plane boards; and a diaphragm 4 for which a coil 9 through which a current corresponding to sound signals flow is embedded inside or the coil is arranged on the surface. The two magnet units 2 and 3 are arranged in such a state that the same poles face each other on the distal end side of the magnets provided on the respective surfaces and a distance between the magnets facing each other is a prescribed distance. The diaphragm 9 is provided between the two magnet units 2 and 3, and the coil provided on the diaphragm is positioned in a prescribed magnetic flux concentration space formed roughly in parallel with the diaphragm by the magnets on the respective magnet units. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a speaker that converts an audio signal into audio.

  Generally, a speaker is formed by using a force that a coil receives from a magnetic field by passing a current through a coil installed in a magnetic field generated from a magnet. Therefore, a technique for improving the acoustic characteristics of the speaker by efficiently using the magnetic flux from the magnet has been disclosed (for example, see Patent Document 1). In this technique, two magnets are arranged so that the same poles face each other, a spacer is interposed between the two magnets, and a voice coil is provided beside the spacer. By doing in this way, since a voice coil is arrange | positioned in the repulsive magnetic field by both magnets, magnetic flux density can be used effectively and the acoustic characteristic of a speaker improves.

As shown in FIGS. 23 and 24, there is also a speaker that uses magnets 101 regularly arranged at equal intervals on the flat plate 100 with the aim of thinning the speaker. FIG. 23 is a sectional view of a conventional speaker, and FIG. 24 is an external view of the conventional speaker. In this speaker, the arrangement of the magnetic poles of adjacent magnets 101 on the flat plate 100 is reversed. The flat plate 100 forms a speaker frame. A vibration plate 103 is attached to the frame via an edge 102 so as to vibrate, and the vibration plate 103 is positioned above the magnets 101 arranged. Here, when a current corresponding to an audio signal flows from the terminal 105 through the tinsel wire 106 to the coil 104 embedded in the diaphragm 103, the coil receives a force from the magnetic flux from the magnet 101, and as a result, vibration occurs. The plate 103 vibrates and produces sound. The speaker having such a configuration can be thinned by forming the planar plate 100, the plurality of magnets 101, and the diaphragm 103 in a planar manner.
Japanese Patent Laid-Open No. 9-9392 Japanese Patent No. 3296751 JP-A-11-262089

  Here, as described above, it is possible to reduce the thickness of the speaker by planarly configuring a plurality of magnets constituting the speaker and a diaphragm that generates sound vibration. However, since a plurality of magnets are arranged in a plane on a flat plate, the magnetic flux generated from the magnets leaks upward from the magnet, making it difficult to effectively use the magnetic flux. As a result, the efficiency and acoustic characteristics of the speaker are inevitably deteriorated.

  Further, when the magnets are arranged in a plane, the place where the magnetic flux density is relatively high is a place between the magnets (a magnetic flux concentration place in FIG. 23). If the coil of the is located, there is a risk of contact with the magnet during vibration of the diaphragm. Therefore, in order to avoid contact between the diaphragm and the magnet, the diaphragm must be disposed at a location where the magnetic flux density is lower than the magnetic flux concentration location.

  In view of the above-described problems, the present invention aims to reduce the thickness of a speaker and to effectively use magnetic flux from a magnet constituting the speaker to improve the efficiency and acoustic characteristics of the speaker.

In the present invention, in order to solve the above-described problems, first, in a speaker which is thinned by configuring a magnet and a diaphragm in a planar manner, a repulsive magnetic field is generated by using a magnet arrangement as an opposed type. Therefore, it was decided to improve the efficiency and acoustic characteristics of the speaker. That is, the efficiency and acoustic characteristics of the speaker are improved by repelling the magnetic field leaking above the magnet and causing it to act efficiently with the current flowing in the coil constituting the speaker.

  Specifically, the present invention includes a magnet unit having a flat plate and a plurality of magnets arranged on one surface of the flat plate, and a coil through which a current corresponding to an audio signal flows is embedded inside or A speaker having a coil disposed on a surface thereof, wherein the two magnet units have a same polarity on the tip side of the magnet provided on each surface and between the opposing magnets. The diaphragm is disposed in a state where the distance is a predetermined distance, and the diaphragm is provided between the two magnet units, and a coil provided on the diaphragm is substantially attached to the diaphragm by a magnet on each magnet unit. It is located in a predetermined magnetic flux concentration space formed in parallel.

  In the above speaker, a plurality of magnets are appropriately arranged on a flat plate to constitute one magnet unit. The arrangement of the magnets is not particularly limited, but it is preferable that the magnets are regularly arranged at equal intervals in view of effective utilization of magnetic flux from the magnets and ease of manufacture. In this one magnet unit, the magnetic flux is directed from the N pole to the S pole of the magnet, and a magnetic circuit is formed through the inside of the flat plate or other space.

  In this speaker, two magnet units are used for forming the magnetic circuit. The magnet units are arranged so that the magnets of the respective magnet units face each other. At this time, the magnet with the tip of the S pole is the tip of the magnet so that the tips of the opposing magnets have the same polarity, that is, the magnet with the tip of the N pole faces the magnet with the tip of the N pole. Are arranged so as to face the south pole magnet. Therefore, for example, the magnetic flux emitted from the opposing magnet whose front end portion is N-pole changes the direction toward the adjacent magnet in the vicinity of the intermediate portion. At this time, since the magnetic flux emitted from the two magnets is concentrated, the magnetic flux density at the concentrated portion is relatively high. The predetermined magnetic flux concentration space corresponds to a magnetic flux concentration portion. In other words, when the magnet unit is a single unit, the magnetic flux leaking upward is concentrated in the predetermined magnetic flux concentration space due to the magnetic flux coming from the opposite side.

  More specifically, in the magnetic circuit formed between adjacent magnets on the flat plate, the magnetic flux that leaked upward when the magnet unit is a single unit is placed facing the magnet unit as described above. As a result, the amount of magnetic flux traveling between the magnets increases.

  Therefore, by arranging a diaphragm having a coil in a predetermined magnetic flux concentration space in which the amount of magnetic flux traveling between the magnets increases with the magnet units facing each other, the diaphragm can be vibrated more efficiently. Become. Here, since the diaphragm is vibrated and generates sound, a vibration margin is required around the diaphragm. Therefore, it is necessary to secure the predetermined distance as the distance between the opposing magnet units. Note that the distance between the opposing magnet units does not hinder the vibration of the diaphragm as it is set wider, but it is not possible to effectively use the magnetic flux from the magnet. .

  Here, in order to more efficiently use the magnetic flux formed between the magnet units, the position of the coil embedded in the diaphragm or the surface of the diaphragm when the diaphragm is provided between the magnet units. The position of the coil arranged in is important. That is, the position of the coil matches the above-described predetermined magnetic flux concentration space, so that the diaphragm can be efficiently vibrated. One of the predetermined magnetic flux concentration spaces is a space above adjacent magnets on the magnet unit. Here, the magnetic flux from one magnet to another adjacent magnet concentrates, and even if the diaphragm vibrates, it does not collide with surrounding objects such as a magnet. Leads to improved efficiency and acoustic characteristics.

  Further, when the coil is disposed on the surface of the diaphragm, the coil is preferably disposed on both surfaces of the diaphragm. By arranging the coils on both surfaces of the diaphragm, the amount of coils arranged on one side is reduced. Therefore, the distance between the diaphragm and the magnet can be further reduced, that is, the predetermined distance can be further reduced, and the magnetic flux density formed by the opposing magnet units is increased. Therefore, more efficient vibration of the diaphragm is possible, which leads to improvement in efficiency and acoustic characteristics of the speaker.

  Here, reference is made to the arrangement of magnets in the magnet unit. In the above speaker, the magnets may be arranged in a lattice pattern on the flat plate in the magnet unit, and the magnetic poles on the tip side of adjacent magnets may be different from each other. By arranging magnets regularly in this way, effective utilization of concentrated magnetic flux can be facilitated.

  In addition, the magnets are arranged in a grid pattern on the flat plate in the magnet unit, the magnetic poles on the tip side of adjacent magnets are the same, and the magnet unit is formed of a magnetic material between the magnets. You may make it have a convex part. That is, in the magnet unit, the convex portion is interposed between the magnets, and all the magnets are arranged in the same direction of the magnetic poles. Even in the magnet unit configured as described above, since the convex portion exhibits the same function as the magnet, a magnetic circuit is formed between the magnet and the convex portion, and an efficient diaphragm based on the principle described above. Vibration of the speaker is possible, which leads to improvement in efficiency and acoustic characteristics of the speaker. Although the magnetic flux density formed between the magnet units may be slightly reduced by using convex portions instead of magnets, the efficiency and acoustic characteristics of the speaker are improved while reducing the amount of magnets used. Can be achieved.

  Moreover, you may install this convex part in this plane member with a different member from a plane board. Or when a planar member is comprised with a magnetic body, you may form integrally with the planar member. In this case, the convex portion can be formed by squeezing the planar member.

  Here, in the speaker described above, the coil may be provided by being laminated on the diaphragm. As described above, the predetermined magnetic flux concentration space is a region where magnetic flux that originally leaks to the outside concentrates when two magnet units face each other. Here, the space below the predetermined magnetic flux concentration space (on the flat plate side of the magnet unit) is a space where magnetic flux is formed relatively linearly between adjacent magnets even when the magnet unit is a single unit. The magnetic flux density there is kept relatively high. Of course, when the two magnet units face each other, the magnetic flux density in the predetermined lower space also becomes slightly higher. However, if the diaphragm is located directly in this space, the possibility of interference with the magnet increases. It is difficult to arrange in this predetermined lower space.

  Therefore, the coil is arranged on the surface of the diaphragm, the base end side thereof is positioned in the predetermined magnetic flux concentration space, and the distal end side thereof is below the predetermined magnetic flux concentration space (the magnet unit). By allowing the diaphragm itself to enter the space on the flat plate side), the diaphragm itself is placed at a position where it does not collide with the magnet, so that the vibration of the diaphragm can be reliably avoided, while the magnetic flux density is more efficiently reduced throughout the coil. It can be arranged at a relatively high position. As a result, more efficient vibration of the diaphragm is possible, leading to improvements in speaker efficiency and acoustic characteristics.

  In the above speaker, the diaphragm may have a base portion protruding on the diaphragm, and the coil may be provided on the base portion of the diaphragm. That is, it is possible to increase the height of the coil so that the diaphragm itself is disposed at a position where it does not collide with the magnet, and the coil is positioned in a space where the magnetic flux density is high so that the magnetic flux can be effectively used.

  In the speaker described above, the two diaphragms are provided between the two magnet units without being in contact with each other, and a coil of one of the diaphragms is the predetermined magnetic flux generated by a magnet on the one magnet unit. The coil of the other diaphragm may be positioned in the predetermined magnetic flux concentration space by the magnet on the other magnet unit.

  That is, it is possible to increase the output of the speaker by using two diaphragms arranged between the opposing magnet units. In order to avoid contact with each other when the two diaphragms vibrate, it is preferable to maintain a distance between them so as to avoid contact.

  Here, in the case where two diaphragms are arranged between the magnet units facing each other as described above, it is preferable to consider the phase of the current flowing through the coil of each diaphragm. For example, if the currents flowing through the coil of the one diaphragm and the coil of the other diaphragm are made to have the same phase, the arrangement of the speakers facing the magnet unit causes The vibration direction of the diaphragm is opposite to the vibration direction of the other diaphragm. As a result, the vibration of the air formed by the vibration of the diaphragm can be propagated in the direction (side direction of the speaker) perpendicular to the direction in which the magnet unit and diaphragm are arranged (speaker thickness direction). It becomes. In this case, the air vibration is compressed and propagates in the direction of the side of the speaker, which is useful for forming low-frequency sound. Therefore, as a speaker driving device according to the present invention, the currents flowing through the coil of the one diaphragm and the coil of the other diaphragm are in phase, and the vibration directions of the two diaphragms are reversed. Can be controlled.

  Conversely, the current flowing through the coil of the one diaphragm and the coil of the other diaphragm may be made to flow in opposite phases. When a current is passed in such a phase, the vibration direction of one diaphragm and the vibration direction of the other diaphragm coincide with each other due to the arrangement relationship of the present speaker facing the magnet unit. As a result, it is possible to propagate the vibration of air formed by the vibration of the diaphragm in the direction in which the magnet unit and the diaphragm are arranged (the thickness direction of the speaker). In this case, since the air vibration is generated using the flat portion of the diaphragm, the output efficiency of the speaker is improved, which is useful for the formation of high frequency sound. Therefore, as a speaker driving device according to the present invention, the vibration directions of the two diaphragms are set in the same direction, with the current flowing through the coil of the one diaphragm and the coil of the other diaphragm being in reverse phase. Can be controlled.

  Further, in consideration of the way current flows through the coils of these diaphragms, in the speaker driving device, the vibration directions of the two diaphragms may be controlled according to the frequency band of the audio signal. Good. For example, when the audio signal is a low-frequency signal, the current flowing through the coil of the one diaphragm and the coil of the other diaphragm is in phase, and the audio signal is a high-frequency signal The vibration directions of the two diaphragms may be controlled by setting the currents flowing through the coil of the one diaphragm and the coil of the other diaphragm to have opposite phases. By controlling the vibration direction of the diaphragm, sound can be formed according to the characteristics of the sound signal. The control of the vibration direction of the diaphragm based on the frequency band of the audio signal is not limited to this.

  Second, in order to solve the above-described problem, a magnet unit having a flat plate and a plurality of magnets arranged on one surface of the flat plate, and a coil through which a current corresponding to an audio signal flows are provided. Or a diaphragm having a coil disposed on a surface thereof, wherein the magnet unit induces the magnetic flux so that the magnetic flux from the magnet is directed substantially parallel to the diaphragm. It has a magnetic flux guide member, the diaphragm is provided facing the magnet unit, and the coil provided on the diaphragm is located in the magnetic flux induced by the magnetic flux guide member.

  In the above speaker, the diaphragm is not disposed between the magnet units as described above, but the diaphragm is disposed so as to face one magnet unit. As a result, there is a possibility that the amount of magnetic flux formed by the magnet of the magnet unit leaks to the outside. However, the speaker is provided with a magnetic flux guiding member, which vibrates the magnetic flux that is about to leak to the outside. Guiding approximately parallel to the plate. Therefore, the magnetic flux density between the magnets is increased, and the efficiency and acoustic characteristics of the speaker can be improved by positioning the coil of the diaphragm in a space where the magnetic flux density is increased.

  In the above speaker, the magnets are arranged in a lattice pattern on the flat plate in the magnet unit, the magnetic poles on the tip side of adjacent magnets are the same, and the magnetic flux guiding member is a magnetic material between the magnets. You may make it be the convex part formed by. That is, in the magnet unit, the convex portion is interposed between the magnets, and all the magnets are arranged in the same direction of the magnetic poles. Even in the magnet unit configured as described above, since the convex portion exhibits the same function as the magnet, a magnetic circuit is formed between the magnet and the convex portion, and an efficient diaphragm based on the principle described above. Vibration of the speaker is possible, which leads to improvement in efficiency and acoustic characteristics of the speaker. Although the magnetic flux density formed between the magnet units may be slightly reduced by using convex portions instead of magnets, the efficiency and acoustic characteristics of the speaker are improved while reducing the amount of magnets used. Can be achieved. Moreover, you may install this convex part in this plane member with a different member from a plane board. Or when a planar member is comprised with a magnetic body, you may form integrally with the planar member. In this case, the convex portion can be formed by squeezing the planar member.

  Moreover, you may make it the front-end | tip part of the magnet on the said magnet unit be covered with the magnetic cover body formed with the magnetic body. By doing in this way, it becomes possible to increase the magnetic flux density of the magnetic circuit formed between magnets, reducing the amount of magnetic flux which leaks outside from a magnet. In addition, it is necessary to adjust the position of the diaphragm with respect to the magnet unit so that the magnetic lid and the diaphragm do not collide by providing the magnetic lid.

  Moreover, you may make it the said convex part have a projection part which protrudes with respect to this magnet in the position facing the said magnet of the front end side. By doing so, the direction of the magnetic flux can be directed, that is, the directivity of the magnetic flux can be increased, and the magnetic flux formed between the convex portion and the magnet can be more efficiently concentrated. Become. Also, since magnets are usually made by sintering compressed magnetic material powder, it is difficult to make the tip part into a specific shape, but it is easy to process the shape at the convex part. is there.

  Further, the magnetic flux guiding member may be a magnetic fluid interposed between the magnet and the diaphragm. Due to the presence of the magnetic fluid, the amount of magnetic flux leaking from the magnet to the outside can be reduced, and the magnetic flux density of the magnetic circuit formed between the magnets can be increased. Since the magnetic fluid is not a rigid body, the presence of the magnetic fluid does not hinder the operation of the diaphragm. Therefore, the position of the diaphragm with respect to the magnet unit can be kept as small as possible.

  The magnetic flux guide member may be a magnetic plate formed of a magnetic material on a surface of the diaphragm opposite to the side facing the magnet unit or a magnetic member constituting the diaphragm. Good. The presence of the magnetic plate or the magnetic member makes it possible to reduce the amount of magnetic flux leaking from the magnet to the outside and increase the magnetic flux density of the magnetic circuit formed between the magnets. Since the magnetic plate is provided on the surface of the diaphragm opposite to the side facing the magnet unit, there is no possibility that the magnetic plate contacts the magnet. Therefore, the distance between the magnet unit and the diaphragm can be kept as small as possible.

Third, in order to solve the above-described problem, a magnet unit having a flat plate and a plurality of magnets arranged on one surface of the flat plate, and a coil through which a current corresponding to an audio signal flows are provided on the surface. A speaker provided on the diaphragm, wherein the diaphragm is provided facing the magnet unit, and the coil is provided on and stacked on the diaphragm. A coil is located in the magnetic flux formed substantially parallel to the diaphragm by the magnet on the magnet unit. That is, by stacking the coils, it is possible to arrange the coils in a space with a high magnetic flux density and to avoid interference between the magnet and the diaphragm.

  Fourth, in order to solve the above-described problem, a magnet unit having a flat plate and a plurality of magnets arranged on one surface of the flat plate, and a coil through which a current corresponding to an audio signal flows are provided on the surface. A diaphragm comprising: a diaphragm disposed on the diaphragm, wherein the diaphragm has a platform-like portion protruding on the diaphragm, and the diaphragm is provided facing the magnet unit; The coil is provided on the platform in the diaphragm, and the coil is positioned in a magnetic flux formed substantially parallel to the diaphragm by the magnet on the magnet unit. That is, by raising the coil with the trapezoidal portion, it is possible to dispose the coil in a space with a high magnetic flux density and to avoid interference between the magnet and the diaphragm.

  In addition to reducing the thickness of the speaker, it is possible to effectively use the magnetic flux from the magnets constituting the speaker to improve the efficiency and acoustic characteristics of the speaker.

  Here, an embodiment of a speaker according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a speaker 1 according to the present invention. The speaker 1 is formed by arranging the upper magnet unit 2 and the lower magnet unit 3 so as to face each other. More specifically, in the upper magnet unit 2, a plurality of magnets 2b are regularly arranged on the frame 2a with equal intervals. The lower magnet unit 3 also has a plurality of magnets 3b arranged on the frame 3a at regular intervals. The arrangement of the magnets in these magnet units is as shown in FIG. FIG. 2 is a view of the magnet unit as viewed from above. The magnets 2b and 3b are rectangular magnets whose ends are N-poles or S-poles, and the plurality of magnets 2b and 3b are magnetic poles whose tips are different from each other in relation to adjacent magnets. Are regularly arranged.

  Here, as described above, the speaker 1 is arranged so that the upper magnet unit 2 and the lower magnet unit 3 face each other. More specifically, as shown in FIG. In the magnets, the magnet units are arranged so that the magnetic poles at the tips of the opposing magnets have the same polarity. Further, a diaphragm 4 having a coil 9 embedded therein is provided between the upper magnet unit 2 and the lower magnet unit 3 facing each other. The diaphragm 4 is elastically fixed to the frame 3 a of the lower magnet unit 3 through the edge 5. The coil 9 of the diaphragm 4 is connected to a connector 6 provided outside the lower magnet unit 3 through the tinsel wire 8. A current corresponding to the audio signal is supplied to the connector 6 from the outside of the speaker 1 through the cord 7.

  When a current corresponding to the audio signal is supplied to the coil 9, the coil 9 through which the current flows is received by the magnetic flux of the magnetic circuit formed between the magnet units, and the vibration of the diaphragm 4 is generated to generate sound. Therefore, a predetermined distance is provided between the tip of the magnet 2b on the upper magnet unit 2 and the tip of the magnet 3b on the lower magnet unit 3 so as not to disturb the vibration of the diaphragm 4 for generating sound. It has been kept.

  The formation of the magnetic circuit in the speaker 1 configured as described above will be described in detail. As described above, both magnet units are arranged so that the magnetic poles on the tip side of the opposing magnets have the same polarity. For this reason, the magnetic flux emitted from the magnets 2b and 3b whose front ends are N-poles is partly directed to the S-pole of the adjacent magnet, but another part is rebounded at the center of the magnet unit. Is directed to the S pole of the adjacent magnetic pole. That is, a repulsive magnetic circuit is formed.

  As a result, a magnetic circuit having a relatively high magnetic flux density is formed between the two magnet units, particularly near the center thereof. In other words, when the upper (lower) magnet unit is placed alone, a part of the magnetic flux by the magnet 2b (3b) is directed away from the frame 2a (3a) and leaks outside without reaching the adjacent magnet. However, when the magnet unit is made to face like the speaker 1 according to the present invention, most of the magnetic flux leaking to the outside is directed to the adjacent magnet. Therefore, it is possible to form a space having a relatively high magnetic flux density in the space between both magnet units.

  Here, since the magnetic flux density is relatively high even in the space between the two magnet units, the vibration of the diaphragm 4 can be efficiently performed, and contact between the diaphragm 4 and the magnets 2b and 3b can be avoided. The place is an upper space between the magnets 2b (3b) on the frame 2a (3a) (hereinafter, the space is referred to as “high magnetic flux density space”), and is a place surrounded by a solid line in FIG. . The reason why the magnetic flux density in the high magnetic flux density space is relatively high is that, as described above, the magnetic flux emitted from the opposing magnets is repelled and concentrated in the high magnetic flux density space. When the upper magnet unit 2 and the lower magnet unit 3 are substantially the same as in this embodiment, a high magnetic flux density space is formed near the center thereof.

  The feature of the speaker according to the present invention is that the diaphragm 4 and the frames 2a, 3a, etc. are designed so that many of the coils 9 embedded in the diaphragm 4 are located in this high magnetic flux density space. Is a point. As a result, it is possible to efficiently generate a force with respect to the current corresponding to the audio signal supplied to the coil 9, thereby improving the efficiency and acoustic characteristics of the speaker 1. Further, the speaker 1 can be thinned by forming a magnetic circuit in a planar manner by the upper magnet unit 2 and the lower magnet unit 3.

  A second embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. The speaker 1 according to the present embodiment is obtained by providing two diaphragms 4 and 14 between the upper magnet unit 2 and the lower magnet unit 3 in the speaker 1 shown in the first embodiment (FIG. 1).

  The diaphragm 14 is elastically connected to the upper magnet unit via the edge 15. Further, the diaphragm 14 has a coil embedded therein, like the diaphragm 4, and the coil has a tinsel wire 18, a connector 16, and a cord 17 (same as the tinsel wire 8, the connector 6 and the cord 7, respectively). A current corresponding to the audio signal is supplied via That is, the current corresponding to the audio signal is supplied to the coils in the two diaphragms 4 and 14, respectively. When an electric current is passed, the diaphragms 4 and 14 vibrate, but a constant interval is maintained between the diaphragm 4 and the diaphragm 14 so that they do not contact each other during the vibration.

Here, in the speaker 1 according to the present embodiment, a repulsive magnetic circuit is formed as in the speaker according to the first embodiment. And the feature point is that the coil in the diaphragm 4 is arranged so as to be located in the high magnetic flux density space formed on the lower magnet unit 3 side, and the coil in the diaphragm 14 is on the upper magnet unit 2 side. It is a point arrange | positioned so that it may be located in the high magnetic flux density space formed. The speaker 1 configured in this way efficiently arranges two diaphragms at positions where the magnetic flux density is relatively high, and efficiently generates a force with respect to the current corresponding to the audio signal supplied to the coil. Therefore, the efficiency and acoustic characteristics of the speaker 1 can be improved.

  A third embodiment of the speaker 1 according to the present invention will be described with reference to FIGS. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. The speaker 1 according to the present embodiment is obtained by changing the arrangement of the magnets 22b and 23b in the upper magnet unit 22 and the lower magnet unit 23 in the speaker 1 shown in the first embodiment (FIG. 1).

  FIG. 5 is a diagram showing the arrangement of the magnets 22b (23b) in the upper magnet unit 22 (lower magnet unit 23). Also in the present embodiment, the magnet 22b (23b) is arranged on the frame 22a (23a) as in the first embodiment. However, a magnetic member 22c (23c) made of a magnetic material and having the same shape as the magnet 22b (23b) is provided in place of the magnet disposed at the position where the tip of the magnet becomes the S pole in the first embodiment. Therefore, on the frame 22a (23a), the magnet 22b (23b) having the N-pole tip and the magnetic member 22c (23c) are regularly arranged so as to be adjacent to each other.

  Then, when the upper magnet unit 22 and the lower magnet unit 23 are opposed to each other, the positions of the magnet and the magnet on each magnet unit are determined so that the magnetic member and the magnetic member are opposed to each other. Since the magnetic member is made of a magnetic material, it can exhibit the same function as the magnet shown in FIG. As a result, a high magnetic flux density space is formed between the upper magnet unit 22 and the lower magnet unit, and it is possible to efficiently generate a force for the current corresponding to the audio signal supplied to the coil. Thus, the efficiency and acoustic characteristics of the speaker 1 can be improved. Further, in producing the speaker 1, it is possible to reduce the amount of magnets to be used and to reduce the cost.

  In this embodiment, the magnetic member 22c (23c) is disposed on the frame 22a (23a). However, when the frame 22a (23a) itself is formed of a magnetic material, the frame 22a ( 23a) and the magnetic member 22c (23c) may be integrally formed.

  A fourth embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. The speaker 1 according to the present embodiment is obtained by providing two diaphragms 4 and 14 between the upper magnet unit 22 and the lower magnet unit 23 in the speaker 1 shown in the third embodiment (FIG. 4).

  In the speaker 1 according to the present embodiment, a repulsive magnetic circuit is formed as in the speaker according to the third embodiment. And the feature point is that the coil in the diaphragm 4 is arranged so as to be located in the high magnetic flux density space formed on the lower magnet unit 23 side, and the coil in the diaphragm 14 is on the upper magnet unit 22 side. It is a point arrange | positioned so that it may be located in the high magnetic flux density space formed. The speaker 1 configured in this way efficiently arranges two diaphragms at positions where the magnetic flux density is relatively high, and efficiently generates a force with respect to the current corresponding to the audio signal supplied to the coil. Therefore, the efficiency and acoustic characteristics of the speaker 1 can be improved.

A fifth embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. The speaker 1 according to the present embodiment is obtained by changing the arrangement specification of the coil 29 in the diaphragm 24 in the speaker 1 shown in the first embodiment (FIG. 1).

  In the diaphragm 24, coils 29 through which a current corresponding to an audio signal flows are arranged on both surfaces of the diaphragm 24. And the coil 29 arrange | positioned on the surface of the diaphragm 24 is located in the high magnetic flux density space where magnetic flux density is comparatively high among the repulsive type magnetic circuits formed by the upper magnet unit 2 and the lower magnet unit 3. Placed in. The speaker 1 configured as described above can efficiently generate a force with respect to the current corresponding to the audio signal supplied to the coil by arranging the diaphragm 24 at a position where the magnetic flux density is relatively high. Thus, the efficiency and acoustic characteristics of the speaker 1 can be improved.

  In addition, by arranging the coils 29 on both surfaces of the diaphragm 24, it is possible to efficiently arrange the coils in the high magnetic flux density space, and the amount of coils arranged on one side of the diaphragm 24 is reduced. As a result, the distance between the diaphragm 24 and the magnet 2b (3b) can be reduced as much as possible. Thereby, the speaker 1 can be made thinner and the efficiency can be further improved.

  Further, in the present embodiment, as in the above-described third embodiment, a magnetic member may be provided in place of a magnet whose tip portion is an S pole among the facing magnets. That is, the arrangement of the magnets and magnetic members in the upper magnet unit 2 and the lower magnet unit 3 may be as shown in FIG.

  A sixth embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. The speaker 1 according to the present embodiment is obtained by providing two diaphragms 24 and 34 between the upper magnet unit 2 and the lower magnet unit 3 in the speaker 1 shown in the fifth embodiment (FIG. 7). The diaphragm 34 has the same configuration as the diaphragm 24.

  In the speaker 1 according to the present embodiment, a repulsive magnetic circuit is formed similarly to the speaker according to the fifth embodiment. And the feature point is that the coil on the diaphragm 24 is arranged so as to be located in the high magnetic flux density space formed on the lower magnet unit 3 side, and the coil on the diaphragm 34 is on the upper magnet unit 2 side. It is a point arrange | positioned so that it may be located in the high magnetic flux density space formed. The speaker 1 configured in this way efficiently arranges two diaphragms at positions where the magnetic flux density is relatively high, and efficiently generates a force with respect to the current corresponding to the audio signal supplied to the coil. Therefore, the efficiency and acoustic characteristics of the speaker 1 can be improved.

  Further, in the present embodiment, as in the above-described third embodiment, a magnetic member may be provided in place of a magnet whose tip portion is an S pole among the facing magnets. That is, the arrangement of the magnets and magnetic members in the upper magnet unit 2 and the lower magnet unit 3 may be as shown in FIG.

  A seventh embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. The speaker 1 according to the present embodiment is obtained by arranging the coils 29 in the diaphragm 24 in a stacked manner in the speaker 1 shown in the fifth embodiment (FIG. 7).

In the diaphragm 24, the coils 29 through which a current corresponding to an audio signal flows are arranged on both surfaces of the diaphragm 24 as described in the fifth embodiment. In this embodiment, the coils 29 are further arranged in a laminated form. By doing so, the base end side (diaphragm 24 side) of the coil 29 arranged in this laminated shape is located in the high magnetic flux density space by the repulsive type magnetic circuit as described above, and the tip end of the coil 29 The side (frame side of the magnet unit) is located in the space between the magnets. The space between the magnets where the tip side of the coil 29 is located is a space where the magnetic flux density is relatively high even if the magnet units are not opposed to each other. However, since the magnet and the diaphragm are in contact, the diaphragm itself can be arranged. It is a difficult space.

  Therefore, in the present embodiment, the diaphragm 24 itself is located at a place where contact with the magnet can be avoided. However, by stacking the coils 29, the diaphragm 24 itself receives force efficiently from the magnetic flux in the high magnetic flux density space. The coil 29 can be positioned at a place where force is also received from the magnetic flux between the magnets, and the efficiency and acoustic characteristics of the speaker 1 can be improved.

  An eighth embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. The speaker 1 according to the present embodiment is obtained by providing two diaphragms 24 and 34 between the upper magnet unit 2 and the lower magnet unit 3 in the speaker 1 shown in the seventh embodiment (FIG. 9). In this embodiment, the coils are arranged in a laminated form only on the surface of the diaphragms 24 and 34 on the magnet unit side. This is because if the coils are arranged on the other surface of the diaphragms 24 and 34 in a stacked manner, the coils may come into contact with each other.

  In the speaker 1 according to the present embodiment, a repulsive magnetic circuit is formed as in the speaker according to the seventh embodiment. And the feature point is that the coil on the diaphragm 24 is disposed so as to be located in the space between the high magnetic flux density space formed on the lower magnet unit 3 side and the magnet on the lower magnet unit 3, and the vibration. The coils in the plate 34 are arranged so as to be positioned in a space between the high magnetic flux density space formed on the upper magnet unit 2 side and the magnets on the upper magnet unit 2. The speaker 1 configured as described above enables the coils on the two diaphragms to be arranged at positions where the magnetic flux density is relatively high, and is efficient with respect to the current corresponding to the audio signal supplied to the coils. Therefore, the efficiency and acoustic characteristics of the speaker 1 can be improved.

  A ninth embodiment of the speaker 1 according to the present invention will be described with reference to FIGS. The present embodiment relates to the reproduction of music in the speaker 1 described above, in which two diaphragms are arranged between the upper magnet unit 2 (22) and the lower magnet unit 3 (23). This is an example. 11 to 13 illustrate the speaker 1 according to the second embodiment (FIG. 3).

  A current corresponding to the audio signal is supplied from the cord 7 to the coil of the diaphragm 4, and a current corresponding to the audio signal is supplied from the code 17 to the coil of the diaphragm 14. Accordingly, each diaphragm can be independently supplied with a current corresponding to the audio signal.

  First, a current corresponding to the same audio signal and having the same phase is supplied to the coil of the diaphragm 4 and the coil of the diaphragm 14. As shown in FIG. 11, from the positional relationship in which the upper magnet unit 2 and the lower magnet unit 3 face each other, when this same phase current is supplied, as shown in FIG. 11, the diaphragm 4 and the diaphragm The vibration direction of 14 is the opposite direction. At this time, the air compressed by the two diaphragms propagates toward the side of the speaker 1 and the sound is transmitted in the direction shown in the figure. In this case, since the sound is mainly formed by the compressed air, the sense of speed of the low-frequency sound is particularly good.

Next, a current corresponding to the same audio signal and having an opposite phase is supplied to the coil of the diaphragm 4 and the coil of the diaphragm 14. As shown in FIG. 12, when the current of the opposite phase is supplied from the positional relationship in which the upper magnet unit 2 and the lower magnet unit 3 face each other, the diaphragm 4 and the diaphragm are shown in FIG. The vibration direction of 14 is the same direction. Therefore, the air oscillated by both diaphragms propagates toward the front of the speaker 1 and the sound is transmitted in the direction shown in the figure. In this case, since the vibration of the air generated by the flat portions of the diaphragms 4 and 14 is transmitted to the outside as it is, the sound generation efficiency is good and it is suitable for reproducing high-frequency sound.

  At this time, in order to efficiently propagate the air vibration generated by the diaphragms 4 and 14 to the front side of the speaker 1, as shown in FIG. 13, the frame 2a (3a) constituting the magnet unit has a through hole 2d ( 3d) may be provided.

  Note that the current supply to the coil of the diaphragm 4 and the coil of the diaphragm 14 may be controlled in accordance with an instruction from a speaker user. That is, when the user attaches importance to low-frequency sound reproduction, a case where a current of the same phase flows through the coil of the diaphragm 4 and the coil of the diaphragm 14 and importance is attached to reproduction of the high-frequency sound. In other words, currents in opposite phases may flow through the coil of the diaphragm 4 and the coil of the diaphragm 14. Alternatively, the audio signal supplied to the speaker 1 may be automatically determined to be a high frequency audio signal or a low frequency audio signal, and the current phase may be controlled based on the result.

  Alternatively, the audio signal is divided into a high frequency region and a low frequency region using a filter, the phase is inverted only by one, and then synthesized again. By supplying this synthesized signal to the speaker 1, the signal whose phase is inverted is output in the opposite phase, and the signal whose phase is not inverted is output in the same phase. It is possible to output signals simultaneously in a suitable state. In the above example, the bass is in the same phase and the treble is in the opposite phase. However, the present invention is not necessarily limited to this, and it is only necessary to output in an optimum state according to the speaker.

  A tenth embodiment of the speaker 1 according to the present invention will be described with reference to FIGS. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. Unlike the speaker 1 described above, a repulsive magnetic circuit is not formed in the speaker 1 according to the present embodiment. That is, the speaker 1 is formed by one magnet unit 22 and the diaphragm 4 arranged to face the magnet unit 22.

  In the magnet unit 22, magnets 22b are regularly arranged on a frame 22a as shown in FIG. In all the magnets 22b, the distal end side is an N pole, and the proximal end S pole is connected to the frame 22a. Here, magnetic members 22c formed of a magnetic material are arranged in a lattice shape between the magnets 22b. Therefore, the magnetic member 22c exhibits a function equivalent to a magnet having a tip portion of the S pole and a base end portion of the N pole, thereby forming a magnetic circuit as shown in FIG. As a result, the space above the magnet 22b and the magnetic member 22c has a relatively high magnetic flux density, and even if the diaphragm 4 is disposed, there is no possibility of contact between the diaphragm 4 and the magnet 22b (hereinafter referred to as “upward”). A high magnetic flux density space R1 "). Therefore, by arranging the diaphragm 4 so that the coil 9 of the diaphragm 4 is positioned in the upper high magnetic flux density space R1, power can be efficiently applied to the current corresponding to the audio signal supplied to the coil 9. As a result, the efficiency and acoustic characteristics of the speaker 1 can be improved.

  An eleventh embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. In the speaker 1 according to the present embodiment, a repulsive magnetic circuit is not formed as in the speaker 1 according to the tenth embodiment. That is, the speaker 1 is formed by one magnet unit 2 and the diaphragm 24 arranged to face the magnet unit 2.

  In the diaphragm 24, the coils 29 are arranged in a laminated manner on the surface of the magnet unit 2 side. By doing in this way, the base end side (diaphragm 24 side) of the coil 29 arrange | positioned in this laminated form is located in the above-mentioned upper high magnetic flux density space R1, and the front end side (magnet unit 2 of the magnet unit 2). The frame 2a side) is located in a space between the magnets 2b below the upper high magnetic flux density space R1 (hereinafter referred to as “lower high magnetic flux density space R2”). The lower high magnetic flux density space R2 where the tip side of the coil 29 is located is a space where the magnetic flux density is relatively high, but the magnet 4b and the diaphragm 4 interfere with each other, so that it is difficult to place the diaphragm 4 itself. is there.

  Therefore, in the present embodiment, the diaphragm 24 itself is located at a place where contact with the magnet 2b can be avoided. However, by stacking the coils 29, it is possible to efficiently generate power from the magnetic flux in the upper high magnetic flux density space R1. In addition, the coil 29 can be positioned at a place where force is also received from the magnetic flux in the lower high magnetic flux density space R2, and the efficiency and acoustic characteristics of the speaker 1 can be improved.

  A twelfth embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. In the speaker 1 according to the present embodiment, a repulsive magnetic circuit is not formed as in the speaker 1 according to the tenth embodiment. That is, the speaker 1 is formed by one magnet unit 2 and the diaphragm 24 arranged to face the magnet unit 2.

  In the diaphragm 24, a protrusion 50 is provided, and the coil 29 is disposed on the protrusion 50. That is, the coil 29 is raised to the magnet unit 2 side. By doing in this way, the coil 29 is more reliably positioned in the lower high magnetic flux density space R2. Therefore, in the present embodiment, the diaphragm 24 itself is located at a place where contact with the magnet 2b can be avoided, but the coil 29 is placed at a place where the projections 50 receive a force from the magnetic flux in the lower high magnetic flux density space R2. Can be positioned, and the efficiency and acoustic characteristics of the speaker 1 can be improved.

  A thirteenth embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. In the speaker 1 according to the present embodiment, a repulsive magnetic circuit is not formed as in the speaker 1 according to the tenth embodiment. That is, the speaker 1 is formed by one magnet unit 2 and the diaphragm 24 arranged to face the magnet unit 2.

  In the speaker 1 according to the present invention, the tip of the magnet 2b in the speaker 1 according to the eleventh embodiment described above is covered with a magnetic lid 51 formed of a magnetic material. Thereby, in the magnetic circuit formed by the magnet 2b, the directivity of the magnetic flux between the magnets is increased, and the magnetic flux density is further increased in the space where the coils 29 arranged in a stacked manner are present. As a result, it is possible to efficiently generate a force with respect to the current corresponding to the audio signal supplied to the coil, thereby improving the efficiency and acoustic characteristics of the speaker 1. When the magnetic flux lid body 51 is provided, the position of the diaphragm 24, the height of the coil 29 stacked, and the like are adjusted so that the magnetic flux lid body 51 and the diaphragm 24 do not contact each other.

  A fourteenth embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. In the speaker 1 according to the present embodiment, a repulsive magnetic circuit is not formed as in the speaker 1 according to the tenth embodiment. That is, the speaker 1 is formed by one magnet unit 2 and the diaphragm 24 arranged to face the magnet unit 2.

  In the loudspeaker 1 according to the present invention, in the loudspeaker 1 according to the thirteenth embodiment, the magnets 2b on the magnet unit 2 are regularly arranged so that the tip part is the N pole in all. A magnetic member 52 made of a magnetic material is provided between the magnets 2b. The magnetic member 52 exhibits a function equivalent to that of a magnet having a distal end portion having an S pole and a proximal end portion having an N pole, whereby a magnetic circuit as shown in FIG. 19 is formed. Thus, by positioning the coil 29 in the upper high magnetic flux density space R1 and the lower high magnetic flux density space R2, it is possible to efficiently generate a force with respect to the current corresponding to the audio signal supplied to the coil 29. Thus, the efficiency and acoustic characteristics of the speaker 1 can be improved.

  Further, as shown in FIG. 20, the magnetic member 52 may be provided with a protruding portion 52a protruding toward the magnet 2b or the magnetic lid 51 at the tip side. By doing in this way, in the magnetic circuit formed by the magnet 2b and the magnetic member 52, the directivity of the magnetic flux between them is further increased, and the magnetic flux density is further increased in the space where the coils 29 arranged in a stacked manner exist. It becomes possible to raise.

  A fifteenth embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. In the speaker 1 according to the present embodiment, a repulsive magnetic circuit is not formed as in the speaker 1 according to the tenth embodiment. That is, the speaker 1 is formed by one magnet unit 2 and the diaphragm 4 disposed so as to face the magnet unit 2.

  A feature of the speaker 1 according to the present invention is that a magnetic fluid 53 including a magnetic material is interposed between the magnet 2 b on the magnet unit 2 and the diaphragm 4. Since the magnetic fluid 53 has a relatively high viscosity, it is applied to the surface of the diaphragm 4 on the magnet unit 2 side. Due to the presence of the magnetic fluid 53, in the magnetic circuit formed by the magnet 2b, the directivity of the magnetic flux between the magnets can be further increased, and the magnetic flux density can be further increased in the space where the coil 9 in the diaphragm 4 exists. It becomes. As a result, it is possible to efficiently generate a force with respect to the current corresponding to the audio signal supplied to the coil 9, thereby improving the efficiency and acoustic characteristics of the speaker 1. Since the magnetic fluid 53 is a fluid, it does not hinder the vibration of the diaphragm 4.

  A sixteenth embodiment of the speaker 1 according to the present invention will be described with reference to FIG. The same components as those of the speaker 1 according to the embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. In the speaker 1 according to the present embodiment, a repulsive magnetic circuit is not formed as in the speaker 1 according to the tenth embodiment. That is, the speaker 1 is formed by one magnet unit 2 and the diaphragm 4 disposed so as to face the magnet unit 2.

  A feature of the speaker 1 according to the present invention is that a magnetic plate 54 made of a magnetic material is provided on the surface of the diaphragm 4 opposite to the magnet unit 2. Due to the presence of the magnetic plate 54, it is possible to reduce the amount of magnetic flux generated by the magnet 2b and leaking outside. As a result, the magnetic flux density can be further increased in the space where the coil 9 in the diaphragm 4 exists. Therefore, it becomes possible to generate force efficiently with respect to the current corresponding to the audio signal supplied to the coil 9, thereby improving the efficiency and acoustic characteristics of the speaker 1.

It is a figure which shows schematic structure of the speaker which concerns on the 1st Example of this invention. It is a figure which shows the arrangement | sequence of the magnet in the magnet unit of the speaker which concerns on 1st Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 2nd Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 3rd Example of this invention. It is a figure which shows the arrangement | sequence of the magnet and magnetic member in the magnet unit of the speaker which concerns on the 3rd Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 4th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 5th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 6th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 7th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 8th Example of this invention. It is a 1st figure which shows the mode of the generation | occurrence | production of an audio | voice in the speaker which concerns on the 9th Example of this invention. It is a 2nd figure which shows the mode of an audio | voice generation | occurrence | production in the speaker which concerns on the 9th Example of this invention. It is a figure which shows the through-hole provided in the flame | frame of the magnet unit in the speaker which concerns on the 9th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 10th Example of this invention. It is a figure which shows the arrangement | sequence of the magnet and magnetic member in the magnet unit of the speaker which concerns on the 10th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 11th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 12th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 13th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 14th Example of this invention. It is a figure which shows the projection part provided in the front end side of the magnetic member in the speaker which concerns on the 14th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 15th Example of this invention. It is a figure which shows schematic structure of the speaker which concerns on the 16th Example of this invention. It is a figure which shows schematic structure of the conventional speaker. It is a figure which shows the external appearance of the conventional speaker.

Explanation of symbols

1 ... Speaker 2, 22 ... Upper magnet unit (magnet unit)
2a, 22a ... Frame 2b, 22b ... Magnet 22c ... Magnetic member 3, 23 ... Lower magnet unit (magnet unit)
3a, 23a ... Frame 3b, 23b ... Magnet 23c ... Magnetic member 4, 14, 24, 34 ... Diaphragm 5, 15 ... Edge 6, 16 ... · Connectors 7, 17 ··· Cord 8, 18 ··· Kinshi wire 9, 29 ···· Coil 50 ··· Projection 51 ··· Magnetic lid 52 · · · Magnetic member 52a .... Projection 53 ... Magnetic fluid 54 ... Magnetic plate

Claims (19)

A magnet unit having a flat plate and a plurality of magnets arranged on one surface of the flat plate;
A coil in which a current corresponding to an audio signal flows is embedded, or the coil is disposed on the surface, and
The two magnet units are arranged in a state where the same poles are opposed to each other on the tip side of the magnet provided on each surface and the distance between the facing magnets is a predetermined distance,
The diaphragm is provided between the two magnet units, and the coil provided on the diaphragm is located in a predetermined magnetic flux concentration space formed substantially parallel to the diaphragm by the magnet on each magnet unit. A speaker characterized by that.   The speaker according to claim 1, wherein the magnets are arranged in a lattice pattern on the flat plate in the magnet unit, and magnetic poles on the tip side of adjacent magnets are different from each other. The magnets are arranged in a grid pattern on the flat plate in the magnet unit, and the magnetic poles on the tip side of adjacent magnets are the same as each other,
The speaker according to claim 1, wherein the magnet unit has a convex portion formed of a magnetic material between the magnets.   The speaker according to any one of claims 1 to 3, wherein the coil is provided by being laminated on the diaphragm. The diaphragm has a table-like portion protruding on the diaphragm,
The speaker according to any one of claims 1 to 4, wherein the coil is provided on the platform portion in the diaphragm. The two diaphragms are provided between the two magnet units without contacting each other,
The coil of one of the diaphragms is located in the predetermined magnetic flux concentration space by a magnet on one of the magnet units, and the coil of the other vibration plate is the predetermined magnetic flux concentration space by a magnet on the other magnet unit. The speaker according to any one of claims 1 to 5, wherein the speaker is located in the position. The speaker according to claim 6, wherein the currents flowing through the coil of the one diaphragm and the coil of the other diaphragm have the same phase. The speaker according to claim 6, wherein the current flowing through the coil of the one diaphragm and the coil of the other diaphragm has an opposite phase. The speaker driving device according to claim 6,
A speaker driving apparatus characterized in that the vibration directions of the two diaphragms are opposite directions. The speaker driving device according to claim 6,
A speaker driving device characterized in that the vibration directions of the two diaphragms are the same. The speaker driving device according to claim 6,
A loudspeaker drive device that controls a vibration direction of the two diaphragms according to a frequency band of the audio signal. A magnet unit having a flat plate and a plurality of magnets arranged on one surface of the flat plate;
A coil in which a current corresponding to an audio signal flows is embedded, or the coil is disposed on the surface, and
The magnet unit has a magnetic flux guide member that guides the magnetic flux so that the magnetic flux by the magnet is oriented substantially parallel to the diaphragm,
The speaker is characterized in that the diaphragm is provided facing the magnet unit, and a coil provided on the diaphragm is located in a magnetic flux induced by the magnetic flux guiding member. The magnets are arranged in a grid pattern on the flat plate in the magnet unit, and the magnetic poles on the tip side of adjacent magnets are the same as each other,
The speaker according to claim 12, wherein the magnetic flux guiding member is a convex portion formed of a magnetic material between the magnets.   The speaker according to claim 13, wherein a tip portion of the magnet on the magnet unit is covered with a magnetic lid formed of a magnetic material.   The speaker according to claim 13, wherein the convex portion has a protruding portion that protrudes with respect to the magnet at a position facing the magnet on a tip side thereof.   The speaker according to claim 12, wherein the magnetic flux guide member is a magnetic fluid interposed between the magnet and the diaphragm.   The magnetic flux guiding member is a magnetic plate formed of a magnetic material on a surface opposite to a side facing the magnet unit of the diaphragm, or a magnetic member constituting the diaphragm. The speaker according to claim 12. A magnet unit having a flat plate and a plurality of magnets arranged on one surface of the flat plate;
A diaphragm in which a coil through which a current corresponding to an audio signal flows is arranged on the surface;
The diaphragm is provided to face the magnet unit, the coil is laminated on the diaphragm, and the laminated coil is substantially parallel to the diaphragm by a magnet on the magnet unit. A speaker characterized by being located in a magnetic flux formed. A magnet unit having a flat plate and a plurality of magnets arranged on one surface of the flat plate;
A diaphragm in which a coil through which a current corresponding to an audio signal flows is arranged on the surface;
The diaphragm has a table-like portion protruding on the diaphragm,
The diaphragm is provided to face the magnet unit, the coil is provided on the platform in the diaphragm, and the coil is formed substantially parallel to the diaphragm by the magnet on the magnet unit. A speaker characterized by being located in a magnetic flux that is generated.

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