WO2010097952A1

WO2010097952A1 - Speaker voice coil and speaker device

Info

Publication number: WO2010097952A1
Application number: PCT/JP2009/053754
Authority: WO
Inventors: 晋太郎新寺; 宣章高橋; 晶彦古頭
Original assignee: パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2009-02-27
Filing date: 2009-02-27
Publication date: 2010-09-02
Also published as: JPWO2010097952A1

Abstract

Provided is a speaker device having an acoustic radiation performance near to indirectivity. The speaker device uses a voice coil which can be expanded and contracted in a direction along which an inputted audio signal flows.

Description

Voice coil for speaker and speaker device

The present invention relates to a voice coil for a speaker and a speaker device.

A voice coil for a speaker is generally formed by winding a conducting wire along a cylindrical voice coil bobbin, and the conducting wire is wound at least along a cylindrical shape to a predetermined length to form a cylindrical voice coil. Yes. And by arranging a voice coil in a magnetic gap having a width along the cylindrical axis of the voice coil and having a magnetic flux along the radial direction of the voice coil, and passing a current through the voice coil in the magnetic gap, A uniaxial driving force (Lorentz force) along the cylindrical axis direction is generated in the voice coil.

Further, in

Patent Documents

1 and 2 below, a diaphragm driving device is arranged at a position substantially along the surface direction of the diaphragm at the end portion of the diaphragm whose vibration surface is curved, and the diaphragm driving device is arranged through this diaphragm driving device. A speaker device is described in which the end of the diaphragm is driven in a direction substantially perpendicular to the vibration direction of the diaphragm.

JP-A-62-278900 Japanese Patent Laid-Open No. 01-54899

A conventional voice coil generates vibration only because a single voice coil generates a driving force along one axial direction, regardless of whether the voice coil is wound in a cylindrical shape or planarly in the radial direction. Although it is possible to make the sound radiation direction spread depending on the shape of the plate, the vibration direction of the diaphragm is specified by the driving force in one axial direction of the voice coil, and the direction in which the diaphragm vibrates is the main sound radiation direction. Become. Therefore, when such a voice coil is used, it is not possible to obtain an omnidirectional speaker that radiates sound equally in all directions on the acoustic radiation side. In particular, since sufficient sound pressure cannot be generated in the direction perpendicular to the front direction of the diaphragm, there is a large difference in sound pressure between the front and side of one speaker device, and it is generated from one sound source. There is a problem that the sound to be played cannot be viewed equally in all directions on the acoustic radiation side.

Also, in a speaker system that obtains the entire band with a high-frequency speaker unit and a low-frequency speaker unit, sound propagation becomes more straight-forward as the sound goes higher, so let's use the sound radiation range of the low-frequency speaker unit effectively. Then, it is necessary to use an acoustic lens for the loudspeaker unit or use a plurality of units having different radiation directions. For this reason, in order to widen the sound radiation range, an installation space for expanding the sound radiation direction of the speaker unit for high sound is required, and the small speaker unit for high sound corresponds to the low sound speaker unit. What has a broadening of sound is required.

The present invention is an example of a problem to deal with such a problem. That is, to obtain a speaker device that can equally listen to the sound generated from one sound source in all directions on the sound radiation side, and in a high-frequency speaker unit used in a speaker system, one unit matches the low-frequency speaker. It is an object of the present invention to obtain a wide range of sound.

In order to achieve such an object, the speaker voice coil and the speaker device according to the present invention include at least the configurations according to the following independent claims.

[Claim 1] A voice coil for a speaker, wherein the voice coil can be expanded and contracted along a direction in which an input audio signal flows.

[Claim 8] A stationary part and a vibrating part that is directly or indirectly supported by the stationary part and can vibrate, wherein the stationary part has a magnetic circuit forming a magnetic gap, and the vibrating part is A diaphragm having at least an outer peripheral portion supported, and an annular voice coil that is directly or indirectly supported by the diaphragm and is arranged in the magnetic gap to vibrate the diaphragm. A speaker device, wherein a coil includes an expansion / contraction portion that can expand and contract along a direction in which an input audio signal flows, and the coil vibrates and expands by the audio signal.

It is explanatory drawing explaining the voice coil for speakers which concerns on embodiment of this invention. It is explanatory drawing explaining the voice coil for speakers which concerns on embodiment of this invention. It is explanatory drawing explaining the voice coil for speakers which concerns on embodiment of this invention. It is explanatory drawing of the speaker apparatus which concerns on one Embodiment of this invention (the figure (a) is sectional drawing which shows the whole structure, the figure (b) is principal part sectional drawing of the magnetic gap vicinity). It is explanatory drawing explaining the acoustic radiation direction of the speaker apparatus which concerns on embodiment of this invention, and the speaker apparatus which concerns on embodiment of this invention (the figure (a)) is replaced with the conventional dome shape speaker (the figure (b)). It is the figure compared with. It is explanatory drawing explaining the diaphragm of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the diaphragm of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the support structure of the diaphragm in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the support structure of the diaphragm in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the support structure of the diaphragm in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the drawer | drawing-out form of the leader wiring in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the drawer | drawing-out form of the leader wiring in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the drawer | drawing-out form of the leader wiring in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the drawer | drawing-out form of the leader wiring in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the form of the reinforcement part of the diaphragm in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the form of the reinforcement part of the diaphragm in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of formation of the magnetic circuit which can be employ | adopted as embodiment of this invention. It is explanatory drawing which showed the electronic device provided with the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the motor vehicle provided with the speaker which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment of the present invention includes the contents shown in the drawings, but is not limited thereto. In the following description of each drawing, parts that are common to the parts that have already been described are assigned the same reference numerals, and duplicate descriptions are partially omitted.

[Voice coil for speakers]
1 to 3 are explanatory diagrams for explaining a voice coil of the speaker device according to the embodiment of the present invention. The voice coil 10 used in the speaker device according to the embodiment of the present invention needs to be deformed so as to expand or contract the diameter in order to expand and contract in the radial direction. For example, the voice coil 10 is preferably formed in a flat plate shape by winding the conductive wire 10a in a radial direction. As a result, the width 10W of the voice coil 10 in the radial direction can be joined to the outer peripheral portion 11A of the diaphragm 11, and the driving force of the voice coil 10 can be effectively transmitted to the outer peripheral portion 11A. In this case, the

lead wires

30 and 31 are drawn from the inner end and the outer end of the conducting wire 10a, respectively. The voice coil 10 can be expanded or contracted entirely or partially along the direction in which the input audio signal flows, and includes an expansion / contraction part 10P in the illustrated example.

In addition, in order to maintain the state of the wound conductive wire 10a, the conductive material 10a is applied to the voice coil 10 using an adhesive such as polyamide resin, epoxy resin, polyimide resin, rubber, or acrylic resin. Alternatively, a resin film or the like may be attached to the conductive wire 10a as a protective film for the conductive wire 10a.

In addition to the metal material, the conductive wire 10a may be made of an elastic material having conductivity that can be stretched and deformed. For example, the elastic material may be a resin material and an elastic material formed by adding or mixing carbon nanotubes or graphite to the resin material. Further, if necessary, an ionic liquid may be mixed to improve conductivity. Examples of the resin material include fluorinated resins, and examples of the ionic liquid include BMITFSI (1-butyl-3-methylimidazolium bis (trifuluoromethanesulfonyl) imide).

2 and 3 are explanatory views showing an example of forming the expansion / contraction part 10P. The expansion / contraction part 10P is formed by bending or bending a conducting wire 10a through which an audio signal flows so that the bent shape can be deformed. In the example shown in FIG. 2, a plurality of expansion / contraction portions 10 P are arranged at predetermined locations along the circumferential direction, and are formed by a bent portion or a refracting portion of the conducting wire 10 a that forms the voice coil 10. In the drawing, the substantially V-shaped refracting portion is formed downward, but the present invention is not limited to this, and may be changed as long as a bonding force with a diaphragm described later can be secured. As shown in FIG. 2 (b), the expansion / contraction part 10P composed of the refracting part or the bending part can change the refraction angle or the bending state to enlarge or reduce the diameter of the voice coil 10. Further, the voice coil 10 is wound in a flat shape, and an expansion / contraction portion 10P is formed in a concave shape (or a convex shape) with respect to the wound flat surface.

FIG. 3 shows a modification of the expansion / contraction part 10 P formed in the voice coil 10. In the example shown in FIG. 5A, the stretchable part 10P (10P1) is formed by a rectangular refracting part or a bent part. In the example shown in FIG. 5B, the stretchable portion 10P (10P2) is formed by a U-shaped refracting portion or a bent portion. In the example shown in FIG. 5C, the stretchable portion 10P (10P3) is formed by a plurality of W-shaped refracting portions or bent portions. In the example shown in FIG. 6D, a convex refracting portion or a bent portion is formed on the vibration direction of the diaphragm 11, that is, on the outer side in the radial direction of the voice coil 10, thereby forming a stretchable portion 10P (10P4). ing. In the example shown in FIG. 5E, a convex refracting portion or a bent portion is formed in the vibration direction of the diaphragm 11, that is, in the radial direction of the voice coil 10, thereby forming an expansion / contraction portion 10P (10P5). ing.

By forming such a stretchable part 10P in the voice coil 10, the voice coil 10 can be expanded and contracted with a relatively small driving force. Although it is possible to expand and contract the voice coil only by expanding and contracting the conductive wire 10a without forming the expansion / contraction part 10P, a large amplitude cannot be obtained and the sound pressure level cannot be expanded in the low sound range. By forming the flexible stretchable part 10P, the output sound pressure of the speaker can be improved and f0 can be lowered.

[Overall configuration of speaker device]
4A and 4B are explanatory views of the speaker device according to the embodiment of the present invention (FIG. 4A is a cross-sectional view showing the overall configuration, and FIG. 4B is a cross-sectional view of the main part near the magnetic gap). As shown in FIG. 1A, the speaker device 1 includes a stationary part 2 and a vibrating part 3. The stationary part 2 is a part that does not vibrate directly due to the vibration of the voice coil 10, has a magnetic circuit 20 that forms a magnetic gap 20G, and a support part 21 (magnetic or non-magnetic substance) that supports the diaphragm 11. ) And a frame (non-magnetic material such as aluminum) not shown. The vibration part 3 is a part that can be vibrated by being directly or indirectly supported by the stationary part 2 and vibrates positively by the vibration of the voice coil 10. The voice coil 10 itself, the diaphragm 11, a holding part for holding the diaphragm 11 (not shown), etc. form the vibration part 3.

In addition, when the vibration part 3 is directly supported, for example, when the vibration plate 11 is directly joined to the stationary part or joined with an adhesive, or the vibration plate 11 and the holding part are formed integrally. May be directly bonded to the stationary part or bonded with an adhesive. On the other hand, when the vibration part 3 is indirectly supported by the stationary part, for example, the diaphragm 11 is directly joined to the stationary part or bonded with an adhesive via a holding part formed of a separate member with respect to the diaphragm 11. The case where it joins, the case where the diaphragm 11 and the holding part 12 are joined to a stationary part directly or with an adhesive agent through the member formed with a material different from the diaphragm 11 and the holding part 12, etc. are mentioned. It is done.

The diaphragm 11 has at least the outer peripheral portion 11A supported by the support portion 21 of the stationary portion 2, and the voice coil 10 disposed in the magnetic gap 20G is supported by the outer peripheral portion 11A. A voice coil 10 is formed in a ring shape along the outer peripheral portion 11A, and the outer peripheral portion 11A of the diaphragm 11 is vibrated when the voice coil 10 vibrates in the magnetic gap 20G.

Further, as shown in FIG. 4B, the speaker device 1 according to the embodiment of the present invention is such that the direction a of the magnetic flux in the magnetic gap 20G always intersects the radial direction of the voice coil 10 wound in an annular shape. A magnetic gap 20 G having a width w along the radial direction extends in the circumferential direction of the voice coil 10. On the other hand, when a voice current is passed through the voice coil 10, a Lorentz force in the radial direction c acts on the current in the circumferential direction b. That is, in the speaker device 1 according to the embodiment of the present invention, when a voice current is passed through the voice coil 10, a force toward the radially inner side or a force toward the radially outer side acts on the voice coil 10. By passing an alternating current through the coil 10, a force directed radially inward and a force directed radially outward act alternately on the voice coil 10. That is, the speaker device 1 can cause the annular voice coil 10 to expand and contract in the radial direction by passing an alternating current through the voice coil.

When the voice coil 10 expands / contracts, the outer peripheral portion 11A of the diaphragm 11 that supports the voice coil 10 vibrates in the radial direction in accordance with the expansion / contraction vibration. Therefore, the diaphragm 11 is vibrated in all directions. It becomes possible, and it becomes possible to generate the sound close to non-directionality from one diaphragm 11.

In the embodiment shown in FIG. 4, the diaphragm 11 of the speaker device 1 has a dome-shaped curved portion 11B having a convex center, and the body portion of the diaphragm 11 is formed by the curved portion 11B. . An outer peripheral portion 11A is formed in a flat plate shape along the radial direction on the outer periphery of the body portion.

FIG. 5 is an explanatory diagram for explaining the sound radiation direction of the speaker device according to the embodiment of the present invention. The speaker device according to the embodiment of the present invention (FIG. (B)). In the prior art shown in FIG. 5B, the voice coil 10J is vibrated in one axial direction (vibration direction v0) along the central axis O of the dome-shaped diaphragm 11J, so that the sound radiated from the diaphragm 11J is emitted. The acoustic radiation direction s0 has directivity along the central axis O, and it is difficult to obtain a relatively large sound pressure in the direction orthogonal to the central axis O.

On the other hand, in the embodiment of the present invention, the voice coil 10 is subjected to expansion / contraction vibration (vibration direction v) in the radial direction orthogonal to the central axis O as shown in FIG. The sound radiation direction s of the sound is expanded along the radial direction, and a predetermined sound pressure can be obtained in almost all directions on the sound radiation side of the diaphragm 11.

[Shape of diaphragm]
6 (a) is a perspective view as seen from the acoustic radiation side, FIG. 6 (b) is a plan view, FIG. 6 (c) is a cross-sectional view of the diaphragm expansion / contraction part 11C, and FIG. It is explanatory drawing explaining the diaphragm of the speaker apparatus which concerns on a form. In the example shown in FIG. 6, as described above, the diaphragm 11 has a flat plate-shaped outer peripheral portion 11 A along the radial direction and a dome-shaped curved portion 11 B whose center is convex toward the acoustic radiation side. In addition, the diaphragm 11 needs to vibrate efficiently by the expansion / contraction vibration in the radial direction of the voice coil 10.

The diaphragm 11 shown in FIG. 6 has a diaphragm expansion / contraction portion 11C that expands and contracts along the circumferential direction in order to obtain omnidirectional vibration by the vibration of the voice coil 10. The diaphragm expansion / contraction part 11 C is formed by a partially bent part or refracting part on the surface of the diaphragm, and in the illustrated example, formed by a linear bent part or refracting part extending from the center of the diaphragm 11 in the outer peripheral direction. The diaphragm expansion / contraction part 11C extends linearly in the meridian direction on the surface of the dome-shaped diaphragm. In addition, the bent portion or the bent portion is formed in the parallel direction perpendicular to the meridian direction. According to this, it is possible to apply vibrations directed radially from the center of the diaphragm to the curved portion 11C of the diaphragm 11, and it is possible to radiate sound in all directions from the dome-shaped curved portion 11B.

In the illustrated example, a plurality of diaphragm expansion / contraction portions 11C are formed on the surface of the curved portion 11B so that the intervals (θ1, θ2,...) Of the diaphragm expansion / contraction portions 11C are different. The diaphragm expansion / contraction part 11 C is a reinforcing rib formed on the surface of the diaphragm 11, and has a reinforcing function for maintaining the curved shape of the diaphragm surface. By reinforcing the diaphragm 11 in this way, the rigidity of the diaphragm 11 is ensured and the high frequency reproduction limit is extended. By changing the interval (θ1, θ2,...) Of the diaphragm expansion / contraction portion 11C having the reinforcing function, the resonance frequency is dispersed, and the sound pressure characteristic can be flattened (sound pressure characteristic). No peak dips). If necessary, the interval between the diaphragm expansion / contraction portions 11C may be substantially the same.

As shown in FIG. 6B, the diaphragm 11 has a diaphragm expansion / contraction part 11C that expands and contracts along its circumferential direction, and extends from the vicinity of the position where the expansion / contraction part 10P is disposed to the center of the diaphragm 11. A diaphragm expansion / contraction part 11C is formed. According to this, since the diaphragm expansion / contraction part 11C can be efficiently deformed according to the expansion / contraction of the expansion / contraction part 10P, the expansion / contraction vibration of the voice coil 10 can be efficiently replaced with the omnidirectional vibration of the diaphragm 11.

Further, FIG. 6C shows a cross-sectional view taken along the line AA of the diaphragm expansion / contraction portion 11C. The cross-sectional shape of diaphragm expansion-contraction part 11C has a linear wall part on the boundary between a top part and a top part in the figure. The diaphragm expansion / contraction part 11 C enables expansion / contraction by moving the two wall parts in opposite directions with respect to the top part. The cross-sectional shape of the diaphragm expansion / contraction portion 11C is not limited to this, and the wall portion may be formed in a curved shape, or the shape may be changed as long as it can be expanded and contracted.

FIG. 7 shows another example of forming the diaphragm 11. Although the diaphragm 11 has the dome-shaped curved portion 11B, the form of the diaphragm 11 is not limited to this. As shown in FIG. 7A, a conical diaphragm 11 (11-1) having an R surface in the ridge line direction, or a conical vibration in which the ridge line direction is a straight line as shown in FIG. 7B. It is also possible to use a plate 11 (11-2) or the like.

The curved portion 11B shown in FIG. 6 (a) is a body portion of the diaphragm 11, and the body portion of the diaphragm 11 shown in FIG. 7 (a) is concave and curved in cross section with respect to the acoustic radiation direction. The body portion of the diaphragm 11 shown in FIG. 7B has a linear cross-sectional shape.

The material for forming the diaphragm 11 may be a resin film (PET, PI, PEI, etc.), metal (aluminum, titanium, magnesium, etc.), or a rubber-based material that can be elastically deformed.

[Supporting form of holding part (edge part) and diaphragm]
8 to 10 are explanatory diagrams for explaining the support structure of the diaphragm in the speaker device according to the embodiment of the present invention. In the embodiment shown in FIG. 1 described above, the diaphragm 11 includes an outer peripheral portion 11A and a curved portion 11B that are integrally formed. The outer peripheral portion 11A includes an edge portion 11D, and the support portion 21 is interposed via the edge portion 11D. It is supported by. On the other hand, in the example shown in FIG. 8, the holding portion 12 is formed of a separate member, the edge portion 11 D is formed on the holding portion 12, and the vibration plate 11 is supported through the holding portion 12 as a stationary portion. Supported by the portion 21.

The holding unit 12 is a part of the vibration unit 3 described above, and an inner peripheral end thereof is connected to an outer peripheral end of the diaphragm 11, and an outer peripheral end thereof is disposed outside the outer periphery of the diaphragm 11. 21 (stationary part). And the support part 21 (stationary part) with which the outer peripheral end of the holding | maintenance part 12 is connected is formed in the inside or the exterior of the magnetic circuit 20, or can be formed in a part of the magnetic circuit 20. In the illustrated example, the holding portion 12 includes a convex edge portion 11D facing the acoustic radiation side, but conversely, a convex edge portion 11D may be formed on the acoustic radiation side. The voice coil 10 may be directly joined to the diaphragm 11 or may be supported on the diaphragm 11 via the voice coil support portion 13 as shown in FIG. In this case, the outer end of the voice coil support portion 13 is connected to the inner peripheral end of the holding portion 12 as shown in the figure. Note that the voice coil support portion 13 may be rigid in that the vibration of the voice coil 10 is transmitted to the diaphragm 11.

FIG. 9 shows another form of the holding unit 12. In the example shown in FIG. 9A, the holding portion 12 (12-1) includes one or a plurality of curved portions. In the example shown in FIG. 5B, the end of the holding portion 12 (12-2) is supported by a part (inner surface portion) of the magnetic circuit 20. In the example shown in FIG. 2C, the end of the holding portion 12 (12-3) is supported by the support portion 21 outside the magnetic circuit 20. The holding portion 12 may be supported by a frame (not shown) or may be supported by a bottom surface portion 22B of a support column 22 shown in FIG. Further, the end of the holding portion 12 may be supported by a member constituting a magnetic circuit, for example, a plate.

When the diaphragm 11 is required to have high rigidity, it is effective to form the holding portion 12 as a separate member from the diaphragm 11. The holding part 12 supports the vibration plate 11 on the support part 21 (stationary part) so as to freely vibrate, and is required to have a function of returning the vibration plate 11 to an appropriate position when not driven. For this purpose, a material and shape having a high shape restoring force are required. Further, when the holding portion 12 is made of a material having a high internal loss such as a resin material such as rubber or cloth or a metal material such as phosphor bronze, it is possible to reduce the reproduction distortion. Further, by forming the holding portion 12 by combining a resin material having a relatively large internal loss and a metal material (for example, phosphor bronze) having a relatively small internal loss, reproduction distortion can be reduced. Further, if necessary, the holding portion 12 may be formed with a rib that is convex or concave with respect to the direction of acoustic radiation, and the rib may have a shape that extends from the inner peripheral portion of the holding portion 12 toward the outer peripheral portion. For example, the planar shape may be linear or curved. Examples of such an edge include a fixed edge, a free edge, and a tangential edge.

FIG. 10 is an explanatory diagram (overall sectional view) showing a specific support form of the diaphragm in the speaker device according to the embodiment of the present invention. In this embodiment, the stationary part 2 includes a column 22 that supports the central part of the diaphragm 11 from the side opposite to the acoustic radiation side. In the illustrated example, the support column 22 includes a column portion 22 A that supports the central portion of the diaphragm 11 and a bottom surface portion 22 B that supports the magnetic circuit 20. Further, the connection terminal 40 is provided on the support 22, the connection terminal 40 is drawn out from the inside to the outside of the magnetic circuit 20, and the lead-out wiring 30 drawn from the voice coil 10 is drawn out along the support 22. The end is connected to the connection terminal 40.

By providing such a support 22, the sound pressure in the direction along the central axis of the diaphragm 11 is reduced. However, by supporting the diaphragm 11 at both the center and the outer periphery, the side It is possible to increase the sound pressure toward the focus.

[Drawer wiring lead form]
FIG. 11 to FIG. 14 are explanatory diagrams for explaining the lead wire lead-out form in the speaker device according to the embodiment of the present invention. The lead wire 30 is drawn from the voice coil 10, and the lead end of the lead wire 30 is connected to a terminal portion (not shown) provided in the stationary portion 2.

11 and 12 are examples in which the voice coil 10 is supported on the surface opposite to the acoustic radiation side of the diaphragm 11. In the example of FIG. 11A, the lead-out wiring 30 is drawn out on the side opposite to the acoustic radiation side, and is drawn out of the magnetic circuit 20 directly through the center hole 20P of the magnetic circuit. In the example of FIG. 11B, the lead-out wiring 30 is drawn out to the side opposite to the acoustic radiation side, and in detail, a part of the lead-out wiring 30 is drawn out along the curved portion 11 B of the diaphragm 11. It is pulled out of the magnetic circuit 20 through the hole 20P.

In the example of FIG. 12A, the lead-out wiring 30 is drawn out to the acoustic radiation side, the lead-out wiring 30 passes through the diaphragm 11 and is drawn out to the acoustic radiation side, and the tip is the surface on the acoustic radiation side of the magnetic circuit 20. Is pulled out along. In the example of FIG. 12B, the lead-out wiring 30 is drawn out to the acoustic radiation side, the lead-out wiring 30 passes through the diaphragm 11 and is drawn out to the acoustic radiation side, and a part is along the curved portion 11 B of the diaphragm 11. The tip of the magnetic circuit 20 is drawn out along the surface on the acoustic radiation side. In addition, when the lead-out wiring 30 penetrates the diaphragm 11, it is preferable that the through-hole formed in the diaphragm 11 is formed. Further, after the lead-out wiring 30 is passed through the through-hole, it is sealed with an adhesive or the like so as to prevent air from passing through the through-hole, or in order to reduce the addition of sound (air resistance) to the diaphragm 11, The through holes may be left formed so that air can pass through without being blocked with an adhesive or the like.

13 and 14 are examples in which the voice coil 10 is supported on the surface of the diaphragm 11 on the acoustic radiation side. In the example of FIG. 13A, the lead wiring 30 is drawn out to the acoustic radiation side, and the lead wiring 30 is drawn along the acoustic radiation side surface of the magnetic circuit 20. In the example of FIG. 13B, the lead wire 30 is drawn to the acoustic radiation side, a part of the lead wire 30 is drawn along the curved portion 11 B of the diaphragm 11, and the tip of the lead wire 30 is the acoustic radiation of the magnetic circuit 20. It is pulled out along the side surface. In the example of FIG. 13C, the lead wire 30 is drawn to the opposite side to the acoustic radiation side, the lead wire 30 is drawn through the diaphragm 11, passes through the center hole 20 P of the magnetic circuit 20, and Has been pulled out. In addition, when the lead-out wiring 30 penetrates the diaphragm 11, it is preferable that the through-hole formed in the diaphragm 11 is formed, and after the lead-out wiring 30 is passed through the through-hole, the through-hole is bonded to an adhesive or the like. It is preferable to close with.

In the example shown in FIG. 14 (FIG. 14 (a) is a cross-sectional view, and FIG. 14 (b) is a plan view), the lead-out wiring 30 is drawn out over the holding portion 12 (edge portion 11D), and the lead-out wiring 30 is magnetic. It is drawn out of the magnetic circuit 20 through a drawing passage 20A1 provided in the circuit 20. The lead-out passage 20A1 is a groove (20A1) formed on the surface opposite to the acoustic radiation side of the acoustic radiation-side magnetic pole member 20A (plate) forming the magnetic circuit 20. Note that the inside of the extraction passage 20A1 may be closed with an adhesive or the like after the extraction wiring 30 is passed through the extraction passage 20A1. Further, in the vicinity of the inside of the lead-out passage 20A1, in order to prevent disconnection due to stress acting on the lead-out wiring 30, the width of the lead-out passage 30 is increased from the outside to the inside, or the inside of the lead-out passage 30 An elastic resin material may be selected from a group of resin materials such as an adhesive that closes the surface.

[Reinforcement configuration]
FIGS. 15 and 16 (FIG. 15A is a plan view, and FIG. 15B is a cross-sectional view of the reinforcing portion 13) explain the form of the reinforcing portion of the diaphragm in the speaker device according to the embodiment of the present invention. It is explanatory drawing to do. The vibration plate 11 is preferably provided with a reinforcing portion 13 that reinforces the vibration plate 11 along the outer peripheral portion 11A. The reinforcing portion 13 can be obtained by applying an adhesive having elasticity or attaching a material having high rigidity (high Young's modulus material). Examples of the material having high rigidity include metal materials such as aluminum and magnesium, and resin materials such as PSU (polyphenylsulfone resin) and PET (polyester terephthalate). The purpose of the reinforcing portion 13 is to efficiently convert the expansion / contraction vibration of the voice coil 10 to the vibration of the diaphragm 11, and in particular, the flat outer peripheral portion 11A on the curved portion 11B that bends and rises from the flat outer peripheral portion 11A. In order to efficiently transmit the vibration of the voice coil 10 supported on the outer periphery, it is effective to enhance the rigidity of the boundary portion from the outer peripheral portion 11A to the curved portion 11B. Specifically, as shown in FIG. 15, the reinforcing portion 13 can be formed by sticking a reinforcing member 13A across the outer peripheral portion 11A from the curved portion 11B to the boundary portion between the curved portion 11B and the outer peripheral portion 11A. it can.

Further, as shown in FIG. 16A, the reinforcing portion 13 can be formed by forming a partial convex portion or concave portion 13B from the curved portion 11B to the outer peripheral portion 11A of the diaphragm 11. The convex portion or the concave portion 13B functions as a reinforcing rib, and the reinforcing rib is provided at a bent portion extending from the outer peripheral portion 11A to the curved portion 11B, thereby reinforcing the rigidity of the portion.
Further, in order to obtain omnidirectional vibration by vibration of the voice coil 10, it may function as a diaphragm expansion / contraction part that expands and contracts along the circumferential direction.
FIG. 16B shows a cross-sectional view taken along line AA of the reinforcing rib 13B. In the drawing, the cross-sectional shape of the reinforcing rib 13B has a linear wall portion with the top portion as a boundary. The reinforcing rib 13B can be expanded and contracted by moving the two wall portions in directions opposite to each other with the top as a boundary. The cross-sectional shape of the reinforcing rib 13B is not limited to this, and the wall portion may be formed in a curved shape, or the shape may be changed as long as it can be expanded and contracted.

[Form of magnetic circuit]
The magnetic circuit 20 in the speaker device 1 according to the embodiment of the present invention can employ, for example, the configuration shown in FIG. The magnetic circuit 20 employed here has a configuration for extending along the voice coil 10 a magnetic gap 20 G having a magnetic flux direction that intersects the radial direction of the voice coil 10. That is, the magnetic gap 20G is formed between the first magnetic pole member 20A and the second magnetic pole member 20B, and the magnet 20C is disposed in the magnetic path from the first magnetic pole member 20A to the second magnetic pole member 20B. ing. The first magnetic pole member 20 A is disposed on the acoustic radiation side from the voice coil 10 and is disposed so as to cover the outer peripheral portion of the diaphragm 11. The second magnetic pole member 20 B is disposed on the acoustic radiation side from the voice coil 10. Are arranged on the opposite side. In the illustrated example, the first magnetic pole member 20A is a plate (20A) having a cross-sectional plate shape, and the second magnetic pole member 20B is joined to the plate (20A) via the magnet 20C and rises up to face the plate (20A). A yoke (20B) having a portion 20B1. The plate 20A and the yoke 20B are made of a magnetic material such as iron.

FIG. 17 is an explanatory diagram showing an example of forming the magnetic circuit 20 that can be employed as an embodiment of the present invention. The example shown in FIG. 1A shows an internal magnet type magnetic circuit 20 in which a magnet 20 c is arranged inside an annular voice coil 10. A magnetic gap 20G is formed between the first magnetic pole member 20a and the second magnetic pole member 20b disposed on both sides of the magnet 20c. According to this, the magnet 20c can be reduced in size and material, and the entire apparatus can be reduced in weight and cost. In the example shown in FIG. 2A, the voice coil 10 is supported by the inner peripheral portion of the diaphragm 11, and the outer peripheral portion of the diaphragm 11 is supported by the support portion 21 via the holding portion 12. ing.

The example shown in FIG. 5B is an example in which magnets 20c1 and 20c2 are arranged on both the inside and outside of the annular voice coil 10, and the first magnetic pole member 20a1 is placed on the inside and outside of the diaphragm 11. , 20a2 are arranged so as to be joined to the magnets 20c1 and 20c2, and the second magnetic pole member 20b1 is arranged so as to join the magnets 20c1 and 20c2. According to this, since the magnets 20c1 and 20c2 are disposed inside and outside the voice coil 10, high sensitivity and downsizing are possible.

In the example shown in FIG. 5C, as in FIG. 1, an outer magnetic type magnetic circuit is formed by the first magnetic pole member 20a3, the magnet 20c3, and the second magnetic pole member 20b2, and the magnet 20c3 is formed on the magnet 20c3. A repulsive magnet (a magnet having two magnetic poles on the opposite surface) is arranged via the first magnetic pole member 20a3. According to this, the magnetic flux density from the first magnetic pole member 20a3 toward the magnetic gap 20G is increased by the two repulsive magnets 20c3 and 20c4 (the magnetic poles of the two opposing magnets are the same) to achieve high sensitivity and downsizing. It becomes possible.

In the example shown in FIG. 4D, the magnet 20c5 is disposed so as to face the magnetic gap 20G, and the first magnetic pole member 20a4 and the second magnetic pole member 20b3 are joined. This also makes it possible to reduce the size and weight of the entire apparatus by reducing the size of the magnet 20c5.

In the example shown in FIG. 4E, of the first magnetic pole member 20a5, the magnet 20c6, and the second magnetic pole member 20b4 forming the magnetic circuit 20, the first magnetic pole member 20a5 is placed outside the diaphragm 11. It is formed so as to have an inclined surface or a curved surface that rises toward the acoustic radiation side as the surface on the acoustic radiation side is located outward. That is, the first magnetic pole member 20a5 is formed thicker as it goes outward. According to this, the surface on the acoustic radiation side of the first magnetic pole member 20a5 has a horn effect, which makes it possible to improve the efficiency of the speaker device.

In addition, although the magnet described above is magnetized along the direction of the central axis of the speaker device, the present invention is not limited to this, and the direction intersecting the central axis of the speaker device (an oblique direction, a vertical direction). You may use the magnet magnetized by. Further, the magnetic gap 20G provided in the above-described magnetic circuit is formed between the magnet and the plate, or between the plate and the plate, but the magnetic gap 20G may be formed by two different magnets. For example, the magnetic gap 20G may be formed by disposing a magnet at the inner end of the first magnetic pole member 20a4.
Further, in order to increase the magnetic flux density in the magnetic gap 20G, a magnet may be arranged in the middle of the magnetic path formed by the lines of magnetic force passing through the magnetic gap 20G. If FIG. A new magnet may be inserted between both ends of the magnetic pole member 20b1.

As described above, according to the speaker device according to the embodiment of the present invention, a speaker with sound radiation performance close to omni-directionality that allows sound generated from one sound source to be equally viewed in all directions on the sound radiation side. A device can be obtained. Moreover, in the high-pitched speaker unit (tweeter) used in the speaker system, it is possible to obtain a sound spread corresponding to the low-pitched speaker (woofer or subwoofer) with one unit. Therefore, when obtaining a speaker system with a wide acoustic emission range, by adopting the omnidirectional speaker device according to the embodiment of the present invention, it is possible to reduce the size and space-saving of the high-frequency speaker unit, and to produce a wide-band sound. A speaker with a wide acoustic emission range can be obtained.

At that time, by providing the voice coil 10 with a flexible expansion / contraction part 10P to facilitate the expansion / contraction vibration, the output sound pressure of the speaker device can be increased and the sound pressure frequency characteristic is lowered to a low sound range. It becomes possible to enlarge. Since the form of the expansion / contraction part 10P affects f0 of the speaker device, an appropriate setting is made according to the target value.

The speaker device according to the embodiments or examples of the present invention can be effectively used for various electronic devices and in-vehicle use. FIG. 18 is an explanatory view showing an electronic apparatus including the speaker device according to the embodiment of the present invention. For example, the electronic device 100 such as the illustrated large-screen flat panel display can reduce the space required for installing the speaker device 1, and thus the entire electronic device can be downsized. Further, even with a miniaturized electronic device, sufficient sound output and acoustic radiation performance close to non-directionality can be obtained, so that sound can be equally transmitted to a plurality of viewers. FIG. 19 is an explanatory view showing an automobile provided with a speaker according to an embodiment of the present invention. In the automobile 101 shown in the figure, the space in the vehicle can be expanded by downsizing the speaker device 1. In particular, since the sound can be radiated to the entire interior of the vehicle regardless of where the speaker device 1 is installed, each occupant can view the sound at the same sound pressure level even when a large number of people are in the vehicle. In addition, since sufficient sound output can be obtained for each passenger, music and radio broadcasting can be enjoyed comfortably in the vehicle even during high-speed driving with a lot of noise.

In addition, as a building equipped with the speaker device 1, a hotel, inn or training that can accommodate a large number of people, such as a house (building) intended for the residence of people, a meeting, a lecture, a party, etc. When the speaker device 1 is installed in a facility or the like (building), the thickness space necessary for the installation of the speaker device 1 can be reduced, so that unnecessary space can be deleted and the space can be used effectively. In recent years, with the widespread use of projectors and large-screen TVs, etc., there have been examples of providing living rooms with audio / video equipment, while living rooms without audio / video equipment have been provided. In some cases, etc. are used as theater rooms. Even in such a case, by using the speaker device 1, it is possible to easily convert a living room or the like into a theater room and to effectively use the space in the living room. Note that the speaker device 1 may be arranged at, for example, a ceiling or a wall in a living room.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. In addition, the above-described embodiments can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose and configuration.

Claims

A speaker voice coil, wherein the speaker voice coil can be expanded and contracted along a direction in which an input voice signal flows.
The speaker voice coil according to claim 1, further comprising an expansion / contraction section that can expand and contract along a direction in which an input audio signal flows.
3. The voice coil for a speaker according to claim 2, wherein the expansion / contraction part is formed by bending or bending a conducting wire through which a voice current flows so that the bent shape can be deformed.
4. The speaker voice coil according to claim 3, wherein the speaker voice coil is wound in a flat shape, and the expansion / contraction portion is formed in a concave shape or a convex shape with respect to the wound flat surface.
4. The voice coil for a speaker according to claim 3, wherein the expansion / contraction portion is formed by being refracted or bent convexly outward or inward in the radial direction.
4. The voice coil for a speaker according to claim 3, wherein the expansion / contraction portion is formed at a plurality of locations at predetermined intervals along the circumferential direction.
The speaker voice coil according to claim 1, wherein the conducting wire through which the audio signal flows is formed of a resin material.
A stationary part, and a vibrating part that is directly or indirectly supported by the stationary part and can vibrate,
The stationary part has a magnetic circuit forming a magnetic gap,
The vibrating part includes a diaphragm having at least an outer peripheral part supported, and an annular voice coil that is directly or indirectly supported by the diaphragm and is arranged in the magnetic gap to vibrate the diaphragm. And
The speaker device, wherein the voice coil includes an expansion / contraction section that can expand and contract along a direction in which an input audio signal flows, and the speaker coil vibrates and expands by the audio signal.
9. The speaker device according to claim 8, wherein the expansion / contraction part is formed by bending or bending a conducting wire through which an audio current flows so that the bent shape can be deformed.
10. The speaker device according to claim 9, wherein the voice coil is wound in a flat shape, and the expansion / contraction portion is formed in a concave shape or a convex shape with respect to the wound flat surface.
10. The speaker device according to claim 9, wherein the expansion / contraction portion is formed by refracting the voice coil in a convex shape outward or inward in the radial direction.
The speaker device according to claim 9, wherein the expansion / contraction portion is formed at a plurality of locations at predetermined intervals along the circumferential direction.
The voice coil is wound in a flat shape, and the stretchable portion is formed in a concave shape with respect to the wound flat surface,
The voice coil is directly or indirectly supported by the diaphragm in the circumferential direction other than the stretchable part,
The speaker device according to claim 12, wherein the diaphragm and the extension / contraction part are separated from each other.
The telescopic part is formed by refracting the voice coil in a radially outward or inward shape, and the voice coil is directly or indirectly supported by the diaphragm in the circumferential direction. The speaker device according to claim 9.
The magnetic circuit is characterized in that the direction of magnetic flux in the magnetic gap intersects in the radial direction of the voice coil, and the magnetic gap having a width along the radial direction extends in the circumferential direction of the voice coil. The speaker device according to claim 12.
The speaker device according to claim 15, wherein the diaphragm has a diaphragm expansion / contraction portion that expands and contracts along a circumferential direction thereof.
The speaker device according to claim 16, wherein the diaphragm expansion / contraction part is formed by a partial bent part or a refracting part of the diaphragm surface.
The speaker device according to claim 16, wherein the diaphragm expansion / contraction part is formed by a linear bent part or a refracting part extending from the center of the diaphragm in the outer peripheral direction of the diaphragm.
The diaphragm has a body part and an outer peripheral part formed around the body part,
The speaker device according to claim 16, wherein the diaphragm expansion / contraction portion is formed at a boundary portion between the body portion and the outer peripheral portion from the body portion to the outer peripheral portion.
20. The speaker device according to claim 19, wherein the diaphragm expansion / contraction part is a convex or concave part.
17. The speaker device according to claim 16, wherein the diaphragm is formed with the diaphragm expansion / contraction part from the vicinity of the position where the expansion / contraction part of the voice coil is disposed toward the center of the diaphragm. .
The speaker device according to claim 21, wherein a plurality of the diaphragm expansion / contraction portions are provided such that the interval between adjacent expansion / contraction portions for the diaphragm is different.
23. The speaker device according to claim 22, wherein the diaphragm has a curved portion in which a cross-sectional shape of a body portion thereof is formed in a dome shape convex toward the acoustic radiation side.
The diaphragm includes a body portion and a flat plate-shaped outer peripheral portion formed around the body portion, the voice coil is supported by the outer peripheral portion, and the body portion at a boundary portion between the body portion and the outer peripheral portion. The speaker device according to claim 23, wherein a reinforcing portion is provided from a portion to the outer peripheral portion.
The speaker device according to claim 24, wherein the reinforcing portion is made of a material having rigidity with respect to a material constituting the diaphragm.
26. The speaker device according to claim 25, wherein the reinforcing portion is a partial convex or concave portion formed from the body portion to the outer peripheral portion.
The speaker device according to claim 8, wherein an outer peripheral portion of the diaphragm is supported by the stationary portion via an edge portion.
The speaker device according to claim 8, wherein an outer peripheral portion of the diaphragm is supported in or on the magnetic circuit.
In the magnetic circuit, the magnetic gap is formed between a first magnetic pole member and a second magnetic pole member, and a magnet is disposed in a magnetic path from the first magnetic pole member to the second magnetic pole member. The speaker device according to claim 8, wherein
The first magnetic pole member is disposed on the acoustic radiation side from the voice coil, and is disposed so as to cover the outer peripheral portion of the diaphragm. The second magnetic pole member is disposed on the acoustic radiation side from the voice coil. 30. The speaker device according to claim 29, wherein the speaker device is disposed on the opposite side.
The first magnetic pole member is a plate having a cross-sectional plate shape, and the second magnetic pole member is a yoke having a rising portion that is joined to the plate via a magnet and faces the plate. 29. The speaker device according to 29.
9. The speaker device according to claim 8, wherein a lead wire is drawn from the voice coil, and a lead end of the lead wire is connected to a terminal portion provided in the stationary portion.
33. The speaker device according to claim 32, wherein the voice coil is supported on a surface on the acoustic radiation side of the diaphragm, and the lead-out wiring is led out to the acoustic radiation side.
The speaker according to claim 32, wherein the voice coil is supported on a surface of the diaphragm opposite to the acoustic radiation side, and the lead-out wiring penetrates the diaphragm and is led out to the acoustic radiation side. apparatus.
The speaker device according to claim 8, wherein the stationary portion includes a support column that supports a central portion of the diaphragm from a side opposite to the acoustic radiation side.
An automobile comprising the speaker device according to claim 8.
An electronic apparatus comprising the speaker device according to claim 8.
A building comprising the speaker device according to claim 8.