JP2007267012A - Solid multiangular voice coil, diaphragm and flat speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a voice coil for generating high sound pressure, a diaphragm having the built-in voice coil and a flat speaker using the diaphragm. <P>SOLUTION: This solid multiangular voice coil 11 is formed by being piled in the approximately perpendicular direction to the diaphragm 12 and arranged between sides of the adjacent permanent magnet 13. Thus, driving force is generated most efficiently to the diaphragm 12 which fixes the solid multiangular voice coil 11 by arranging the solid multiangular voice coil 11 at a position where magnetic force generated by the permanent magnet 13 is the strongest and as a result, the sound pressure is raised. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a flat speaker, a voice coil of the flat speaker, and a diaphragm on which the voice coil is formed.

  FIG. 6 shows a schematic structure of a conventional cone speaker. 6A is a sectional view of the cone speaker 100, and FIG. 6B is a perspective view of the voice coil 102 built in the cone speaker 100. FIG. The cone speaker 100 has a driving force acting between a voice coil 102 wound around a cylinder 101 and a permanent magnet 108 fixed to the bottom surface of the cone type yoke 103, and a cone type diaphragm 105 connected to the cylinder 101 is provided. It has a vibrating structure.

  As shown in FIG. 6B, the voice coil 102 is formed by winding a linear conductor 116 on a cylinder 101 using an exclusive winding machine, and bonding and fixing the conductor. A magnetic circuit is arranged so that a magnetic force 106 flows in a direction perpendicular to the voice coil 102, and a driving force 107 is generated in the central axis direction of the cylinder 101.

On the other hand, a flat speaker is conventionally known as a speaker that can be significantly reduced in size compared to the above-described cone speaker (for example, Patent Document 1). A schematic structure of a conventional flat speaker is shown in FIG. FIG. 7A is a cross-sectional view of the flat speaker 110, and FIG. 7B is a plan view of the voice coil built-in flat diaphragm 111 built in the flat speaker 110.
The voice coil 112 built in the diaphragm 111 is built in or in close contact with the diaphragm 111 in parallel, and a plurality of magnets 113 having different polarities are arranged in parallel with the voice coil 112 to form a magnetic circuit. The voice coil 112 on the diaphragm 111 generates the upper and lower driving force 107 using the leakage magnetic field 114 of this magnetic circuit.
JP 2003-284187 A

However, the conventional flat speaker has the following problems. A flat speaker using a voice diaphragm with a built-in voice coil uses a leakage magnetic field of a magnetic circuit in which magnets of different polarities are arranged, so that the voice coil is arranged in a portion where the magnetic flux density is weak. As a result, there is a problem that the sound pressure is lowered.
Accordingly, the present invention has been made to solve these problems, and a voice coil capable of generating a high sound pressure, a diaphragm incorporating the voice coil, and a flat speaker using the diaphragm. The purpose is to provide.

  A first aspect of the present invention is a voice coil formed by arranging linear conductors on a predetermined diaphragm, and is formed by stacking the linear conductors in a direction perpendicular to the diaphragm. A three-dimensional polygonal voice coil.

  The second aspect is arranged between a plurality of magnets arranged with alternating polarities, and the direction of wiring of the linear conductors is determined so that the driving force received from the magnets is in the same direction. A three-dimensional polygonal voice coil.

  According to a third aspect, the linear conductor is a single continuous conductor, and is formed by stacking the linear conductor a predetermined number of times while routing the linear conductor in a predetermined wiring pattern. It is a voice coil.

  According to a fourth aspect of the present invention, there is provided a solid polygonal voice coil characterized in that the linear conductor is arranged so as to surround the magnet to form a loop, and a plurality of the loops are stacked.

  A fifth aspect is a three-dimensional polygonal voice coil, wherein a predetermined number of FPCs (Flexible Printed Circuits) in which the linear conductors are arranged in a predetermined wiring pattern are stacked.

  A sixth aspect is characterized in that an FPC (Flexible Printed Circuit) in which a predetermined number of the linear conductors are wired in a predetermined wiring pattern is arranged in a vertical direction between the plurality of magnets. Is a three-dimensional polygonal voice coil.

  The seventh aspect is formed by placing the solid polygonal voice coil according to any one of the first aspect to the sixth aspect on a predetermined plate material, or enclosing it inside the plate material. It is a diaphragm characterized by being formed.

  In an eighth aspect, a plurality of magnets are disposed at positions facing a magnetic circuit disposed with alternating polarities, and the three-dimensional polygonal voice coil is disposed between adjacent magnets. It is a diaphragm characterized by this.

  A ninth aspect is a diaphragm in which the three-dimensional polygonal voice coil according to the fourth aspect is disposed at a position surrounding the magnet on the plate member.

  According to a tenth aspect, the three-dimensional polygonal voice coil is arranged so as to be line-symmetric with respect to the central axis of the magnetic circuit or point-symmetric with respect to the center of the magnetic circuit. It is a board.

  An eleventh aspect is a planar speaker comprising the diaphragm according to any one of the seventh to tenth aspects.

As described above, according to the present invention, a three-dimensional polygonal voice coil that can be arranged in a portion having the strongest magnetic force, a diaphragm incorporating the three-dimensional polygonal voice coil, and a flat speaker with increased sound pressure using the diaphragm. Can be provided.
In addition, it is possible to realize a highly reliable planar speaker by forming the three-dimensional polygonal voice coil into an integral structure having no connection portion inside. Furthermore, by arranging the three-dimensional polygonal voice coil symmetrically on the diaphragm, an effect that the distortion of sound can be reduced can be obtained.

A configuration of a three-dimensional polygonal voice coil, a diaphragm, and a flat speaker in a preferred embodiment of the present invention will be described in detail with reference to the drawings. In addition, about each structural part which has the same function, the same code | symbol is attached | subjected and shown for simplification of illustration and description.
In order to increase the sound pressure of a flat speaker, it is necessary to arrange a voice coil at a position where the magnetic force generated by the permanent magnet is strong, like a cone speaker. In a flat speaker, a plurality of permanent magnets are arranged in a plane while alternately reversing the magnetic poles, and the position where the magnetic force is the strongest in the magnetic circuit formed in this way is located between the side surfaces of the adjacent permanent magnets. is doing.

  Therefore, the three-dimensional polygonal voice coil of the present invention is arranged between the side surfaces of the adjacent permanent magnets. FIG. 1 shows a three-dimensional polygonal voice coil, a diaphragm, and a flat speaker according to the first embodiment of the present invention. 1A is a cross-sectional view showing a diaphragm 12 and a flat speaker 10 using the three-dimensional polygonal voice coil 11 of the present embodiment, and FIG. 1B is a cross-sectional view of the diaphragm 12 and the diaphragm 12. It is a top view which shows arrangement | positioning of the solid polygonal voice coil 11 which is.

  The three-dimensional polygonal voice coil 11 is formed by being stacked in a substantially vertical direction with respect to the diaphragm 12, and is disposed between the side surfaces of the adjacent permanent magnets 13. Thus, by arranging the three-dimensional polygonal voice coil 11 at a position where the magnetic force generated by the permanent magnet 13 is the strongest, the driving force is most efficiently generated in the diaphragm 12 fixing the three-dimensional polygonal voice coil 11. As a result, the sound pressure can be increased.

  FIG. 1B shows an example in which the three-dimensional polygonal voice coil 11 is arranged on the diaphragm 12. In the figure, the three-dimensional polygonal voice coil 11 forms a substantially square ring so as to surround one of the permanent magnets 13. In this embodiment, the ring is arranged only on the permanent magnet 13 having the same polarity. Yes. The direction of the current flowing in each ring is preferably determined so that the direction of the driving force is the same in all of the rings, thereby obtaining the effect that the driving force can be generated more efficiently.

  As a method for forming the three-dimensional polygonal voice coil 11 as shown in FIG. 1, for example, there is a method as shown in FIG. In the figure, a coil 17 is arranged in a plane at a predetermined position on a planar plate member 16, and the center of the position where a plurality of coils 15 are arranged closely is pushed out to form a groove 18. Thus, the three-dimensional polygonal voice coil 11 and the diaphragm 12 are formed.

  FIG. 3 shows a three-dimensional polygonal voice coil, a diaphragm, and a flat speaker according to the second embodiment of the present invention. In the figure, (a) is a cross-sectional view showing a diaphragm 22 and a flat speaker 20 using the three-dimensional polygonal voice coil 21 of the present embodiment, and (b) is routed to the diaphragm 22 and the diaphragm 22. FIG. 4C is a perspective view illustrating the arrangement of the three-dimensional polygonal voice coil 21, and FIG. 3C is a perspective view illustrating the relationship between the direction of the magnetic force generated in the permanent magnet 13 and the winding direction and driving force of the three-dimensional polygonal voice coil 21.

  In the present embodiment, the three-dimensional polygonal voice coil 21 is configured by forming the ring so as to surround all the permanent magnets 13 including those having different polarities. Each side of the ring is arranged at a position where the magnetic force 23 generated by the permanent magnet 13 is the strongest.

  As shown in FIG. 3 (c), in this embodiment, the permanent magnets 13 at positions where the directions of the currents flowing in the rings are opposed so that the directions of the driving forces 24 generated in the rings are the same. It changes depending on the polarity. That is, the winding direction 25 of each ring is reversed by the polarity (magnetic force direction 23). Thereby, all the directions of the driving force 24 acting on the three-dimensional polygonal voice coil 21 can be made constant.

  FIG. 4 shows a three-dimensional polygonal voice coil and a diaphragm according to the third embodiment of the present invention. In the same figure, (a) is a perspective view showing a diaphragm 32 using the three-dimensional polygonal voice coil 31 of the present embodiment, (b) is a plan view for explaining the wiring direction of the three-dimensional polygonal voice coil 31, and (c). It is a top view explaining another wiring direction.

  In this embodiment, the three-dimensional polygonal voice coil 31 is formed by one continuous linear conductor, and the same wiring pattern is overlapped a predetermined number of times to form a three-dimensional shape. That is, the three-dimensional polygonal voice coil 31 of the present embodiment is formed by a so-called one-stroke method using one continuous linear conductor.

  When the three-dimensional polygonal voice coil 31 is formed with the wiring pattern shown in FIG. 4A, the linear conductors are sequentially routed in the direction as shown in FIG. The three-dimensional polygonal voice coil 31 thus formed is line symmetric with respect to the symmetry axes 33 and 34. As described above, when the wiring pattern of the three-dimensional polygonal voice coil 31 has symmetry, the driving force can be generated in the diaphragm 32 in a well-balanced manner, and the sound distortion can be reduced. can get.

  As a wiring pattern for routing the linear conductor by a one-stroke method, not only the wiring pattern of the three-dimensional polygonal voice coil 31 of this embodiment shown in FIGS. Another wiring pattern in which the three-dimensional polygonal voice coil is arranged at every interval formed by the magnet 13 can also be used. The wiring direction of the linear conductor in this case is shown in FIG. In the case of the wiring pattern shown in the figure, the symmetry as shown in FIG. 4B cannot be obtained.

As shown in FIG. 4, when the solid polygonal voice coil 31 is formed by a one-stroke method using one continuous linear conductor, a connection is formed in the middle of the solid polygonal voice coil 31. Therefore, it is possible to provide a highly reliable voice coil.
On the other hand, when the linear conductors are stacked a predetermined number of times with a predetermined wiring pattern to form a three-dimensional polygonal voice coil 31, the stacked linear conductors are not bonded to each other. It was difficult to stack and form a solid body.
Therefore, an embodiment in which the three-dimensional polygonal voice coil 31 is formed using the self-bonding line will be described with reference to FIG.

  FIG. 5 shows a jig for forming the three-dimensional polygonal voice coil 31 by stacking the linear conductors a predetermined number of times in a predetermined wiring pattern. A jig 41 shown in FIG. 5A has the same arrangement as the permanent magnet 13 arranged at a position facing the three-dimensional polygonal voice coil 31, and a cube 42 is arranged. The three-dimensional polygonal voice coil 31 can be formed by arranging the self-bonding lines 43 along the side surfaces of the cube 42 for the predetermined number of times and then fixing the adjacent self-bonding lines 43 with a predetermined solvent. .

FIG. 5B is a perspective view showing another jig for forming the three-dimensional polygonal voice coil 31. In the jig 44 shown in the figure, pins 45 are arranged at a constant pitch of a predetermined interval, and the self-bonding wire 43 is wound around the pin 45, and then the adjacent self-bonding wires 43 are bonded with a predetermined solvent. The solid polygonal voice coil 31 can be formed by fixing.
Since the three-dimensional polygonal voice coil 31 formed using the jig 41 or 44 does not form a connection part in the middle of the coil, there is no possibility of problems such as poor connection or disconnection, and a highly reliable three-dimensional voice coil 31 is provided. A coil 31 can be provided. Moreover, workability | operativity is also improved significantly by using the jig | tool 41 or 44. FIG.

As another method for forming the three-dimensional polygonal voice coil 31, the three-dimensional polygonal voice coil 31 may be formed by stacking a predetermined number of FPCs (Flexible Printed Circuits) in which the linear conductors are arranged in a predetermined wiring pattern. Is possible.
Alternatively, the three-dimensional polygonal voice coil 31 may be formed by arranging FPC (Flexible Printed Circuit) in which a predetermined number of the linear conductors are arranged in a predetermined wiring pattern in a vertical direction between the plurality of magnets 13. Is possible.

  In addition, the description in this Embodiment shows an example of the solid polygonal voice coil which concerns on this invention, a diaphragm, and a plane speaker, It is not limited to this. The detailed configuration and detailed operation of the three-dimensional polygonal voice coil, the diaphragm, and the flat speaker in the present embodiment can be appropriately changed without departing from the gist of the present invention.

FIG. 1 is a diagram showing a three-dimensional polygonal voice coil, a diaphragm, and a flat speaker according to the first embodiment of the present invention. FIG. 1A is a cross-sectional view of a three-dimensional polygonal voice coil, a diaphragm, and a planar speaker, and FIG. 1B is a plan view showing an arrangement of the diaphragm and the three-dimensional polygonal voice coil. FIG. 2 is a sectional view showing a method of forming the three-dimensional polygonal voice coil shown in FIG. FIG. 3 is a diagram showing a three-dimensional polygonal voice coil, a diaphragm, and a flat speaker according to the second embodiment of the present invention. 3A is a cross-sectional view of the three-dimensional polygonal voice coil, the diaphragm, and the flat speaker, FIG. 3B is a perspective view showing the arrangement of the diaphragm and the three-dimensional polygonal voice coil, and FIG. 3C is a magnetic force generated in the permanent magnet. It is a perspective view explaining the relationship between a direction, the winding direction of a three-dimensional polygonal voice coil, and driving force. FIG. 4 is a diagram showing a three-dimensional polygonal voice coil and a diaphragm according to the third embodiment of the present invention. 4A is a perspective view showing a three-dimensional polygonal voice coil and a diaphragm, FIG. 4B is a plan view explaining the wiring direction of the three-dimensional polygonal voice coil, and FIG. 4C is a plan view explaining another wiring direction. . FIG. 5 is a perspective view showing a jig for forming a three-dimensional polygonal voice coil and a plan view showing the winding direction of the coil. FIG. 5A is a view showing a jig formed from a plurality of cubes, and FIG. 5B is a view showing a jig formed from a plurality of pins. FIG. 6 is a schematic structural diagram showing a conventional cone speaker. FIG. 6A is a sectional view of a cone speaker, and FIG. 6B is a perspective view of a voice coil built in the cone speaker. FIG. 7 is a schematic structural diagram of a conventional flat speaker. FIG. 7A is a cross-sectional view of a planar speaker, and FIG. 7B is a plan view of a voice coil built-in planar diaphragm incorporated in the planar speaker.

Explanation of symbols

10, 20, 30 Flat speaker 11, 21, 31 Solid polygonal voice coil 12, 22, 32 Diaphragm 13, 113 Permanent magnet 14 Edge 15 Yoke 16 Plate material 17 Coil 18 Groove 23 Magnetic direction 24 Driving direction 25 Winding direction 33, 34 Symmetrical axes 41 and 44 Jig 42 Cube 43 Self-bonding wire 45 Pin 100 Cone speaker 101 Cylinder 102 Voice coil 103 Cone type yoke 104 Edge 105 Cone type diaphragm 106 Magnetic force 107 Driving force 108 Permanent magnet 110 Flat speaker 111 Built-in voice coil Planar diaphragm 112 Voice coil 114 Leakage magnetic field 115 Planar yoke 116 Linear conductor

Claims (11)

A voice coil formed by arranging a linear conductor on a predetermined diaphragm,
A three-dimensional polygonal voice coil characterized by being formed by stacking the linear conductors in a direction perpendicular to the diaphragm. Arranged between a plurality of magnets arranged with alternating polarity,
2. The three-dimensional polygonal voice coil according to claim 1, wherein a direction of wiring of the linear conductors is determined so that driving forces received from the magnets are in the same direction. The linear conductor is a single continuous conductor,
3. The three-dimensional polygonal voice coil according to claim 1, wherein the three-dimensional polygonal voice coil is formed by stacking the linear conductors a predetermined number of times while arranging them in a predetermined wiring pattern. The linear conductor is routed so as to surround the magnet to form a loop, and a plurality of the loops are stacked to form the loop. 3D polygonal voice coil. 5. The device according to claim 1, wherein a predetermined number of FPCs (Flexible Printed Circuits) in which the linear conductors are arranged in a predetermined wiring pattern are stacked. The three-dimensional polygonal voice coil described in 1. The FPC (Flexible Printed Circuit) in which a predetermined number of the linear conductors are arranged in a predetermined wiring pattern is arranged between the plurality of magnets in a vertical direction. The three-dimensional polygonal voice coil according to claim 4. The solid polygonal voice coil according to any one of claims 1 to 6 is formed by being placed on a predetermined plate material, or is formed by being included inside the plate material. A diaphragm. A plurality of magnets are arranged at positions facing a magnetic circuit arranged with alternating polarities,
The diaphragm according to claim 7, wherein the three-dimensional polygonal voice coil is disposed so as to be positioned between the adjacent magnets. The diaphragm according to claim 7 or 8, wherein the three-dimensional polygonal voice coil according to claim 4 is disposed at a position surrounding the magnet on the plate member. 10. The three-dimensional polygonal voice coil is disposed so as to be line symmetric with respect to the central axis of the magnetic circuit or point-symmetric with respect to the center of the magnetic circuit. The diaphragm as described in. A flat speaker comprising the diaphragm according to any one of claims 7 to 10.

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