WO2010106683A1

WO2010106683A1 - Speaker device

Info

Publication number: WO2010106683A1
Application number: PCT/JP2009/055524
Authority: WO
Inventors: 靖昭小笠原
Original assignee: パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2009-03-19
Filing date: 2009-03-19
Publication date: 2010-09-23
Also published as: JP5037723B2; JPWO2010106683A1

Abstract

Provided is a thin speaker device capable of high-quality bass reproduction by means of a large-area diaphragm. The speaker device is characterized by being provided with a diaphragm (10), a stationary section (100) for vibratably supporting the outer periphery of the diaphragm (10) along the vibration direction thereof, and plural driving units (14) for supporting the back side of the diaphragm (10) at plural different positions and imparting vibration to the diaphragm (10) in response to an audio signal, and in that the driving unit (14) is provided with a magnetic circuit (20) in which a magnetic gap (20G) is formed along a direction different from the vibration direction of the diaphragm (10), a voice coil (30) vibratably disposed along a uniaxial direction in the magnetic gap (20G), and a rigid vibration direction change section (50) for changing the direction of the vibration of the voice coil (30) and transmitting the vibration changed in direction to the diaphragm (10), the vibration direction change section (50) is equipped with a link portion (51) disposed obliquely with respect to the vibration direction of the voice coil (30) with joints (52) respectively formed on the diaphragm (10) side and the voice coil (30) side, and each of the joints (52) is formed closer to the center of the diaphragm (10) than the location of the magnetic circuit (20).

Description

Speaker device

The present invention relates to a speaker device.

As a general speaker device, a dynamic speaker device is known (see, for example, Patent Document 1). As shown in FIG. 1, for example, the dynamic speaker device is joined to a frame 3J, a cone-shaped diaphragm 21J, an edge 4J that supports the diaphragm 21J on the frame 3J, and an inner peripheral portion of the diaphragm 21J. The voice coil bobbin 610J, the damper 7J that supports the voice coil bobbin 610J on the frame 3J, the voice coil 611J wound around the voice coil bobbin 610J, the yoke 51J, the magnet 52J, and the plate 53J, and the voice coil 611J are arranged. And a magnetic circuit in which a magnetic gap is formed. In this speaker device, when a voice signal is input to the voice coil 611J, the voice coil bobbin 610J vibrates due to the Lorentz force generated in the voice coil 611J in the magnetic gap, and the diaphragm 21J is driven by the vibration.

JP-A-8-149596 (FIG. 1)

For example, as shown in FIG. 1, the general dynamic speaker device described above has a voice coil 611J disposed on the side opposite to the acoustic radiation side of the diaphragm 21J, and vibration directions of the voice coil 611J and the voice coil bobbin 610J. And the vibration direction of the diaphragm 21J is the same. In such a speaker device, the region for vibrating the diaphragm 21J, the region for vibrating the voice coil bobbin 610J, the region where the magnetic circuit is disposed, and the like are in the vibration direction (acoustic radiation direction) of the diaphragm 21J. Therefore, the overall height of the speaker device must be relatively large.

Specifically, as shown in FIG. 1, the size of the diaphragm 21J of the speaker device along the vibration direction is the same as the size of the cone-shaped diaphragm 21J along the vibration direction and the diaphragm 21J is supported by the frame 3J. The height of the edge 4J (a), the voice coil bobbin height (b) from the junction of the diaphragm 21J and the voice coil bobbin 610J to the upper end of the voice coil 611J, the voice coil height (c), and the main magnet of the magnetic circuit It consists of the height (d) and the thickness (e) of the yoke 51J mainly of the magnetic circuit. In such a speaker device, in order to ensure a sufficient vibration stroke of the diaphragm 21J, it is necessary to sufficiently secure the heights a, b, c, d described above, and a sufficient driving force is provided. In order to obtain it, it is necessary to sufficiently secure the heights of c, d, and e described above, and therefore, especially in a loudspeaker type speaker device, the overall height of the speaker device must be large.

Thus, in the conventional speaker device, since the vibration direction of the voice coil bobbin 610J and the vibration direction of the diaphragm 21J are the same direction, if the amplitude of the diaphragm 21J is increased to obtain a large volume, In order to ensure the vibration stroke of the voice coil bobbin 610J, the overall height of the speaker device becomes large, and it is difficult to achieve thinning of the device. That is, there is a problem that it is difficult to achieve both a reduction in device thickness and an increase in volume.

However, in order to efficiently transmit the vibration of the voice coil 611J to the diaphragm 21J, the vibration of the voice coil 611J is directly transmitted to the diaphragm 21J, that is, the vibration direction of the voice coil 611J and the vibration direction of the diaphragm 21J. Are preferably matched. When the vibration direction of the voice coil 611J and the vibration direction of the diaphragm 21J are different, the vibration of the voice coil 611J may not be reliably transmitted to the diaphragm 21J, which causes a problem that the reproduction efficiency of the speaker device is deteriorated. Arise. In particular, in order to obtain good reproduction characteristics in the high sound range, it is necessary to reliably transmit the vibration of the voice coil 611J to the diaphragm.

On the other hand, in a general dynamic type speaker device, the voice coil bobbin 610J is joined to the inner periphery of the cone-shaped diaphragm 21J, and the driving force is transmitted from the voice coil bobbin 610J to the inner periphery of the diaphragm 21J. It is relatively difficult to drive the entire diaphragm at substantially the same phase. Therefore, a speaker device that can drive the entire diaphragm with substantially the same phase is desired.

Also, a large-diameter (large-area) diaphragm is required to perform low-volume sound reproduction. At this time, in the case where the voice coil bobbin 610J is connected only near the center of the diaphragm as in the prior art, the driving force generated by the voice coil 611J must be increased to some extent, and in order to increase the driving force, the magnetic force As the circuit size needs to be increased, there is a problem that the speaker device cannot be thinned. Furthermore, in a large-area diaphragm, although it is possible to increase the rigidity of the diaphragm by making the diaphragm shape into a cone shape, when driven by a single voice coil bobbin 611J, split vibration tends to occur, High-quality playback sound cannot be obtained over a wide band. There is also a problem that the bass reproduction limit cannot be lowered.

Incidentally, for example, a capacitor type speaker device is known as a thin speaker device. This capacitor type speaker device has a structure in which a diaphragm (movable electrode) and a fixed electrode are arranged facing each other. In this speaker device, the diaphragm is displaced by applying a DC voltage between the electrodes, and when a signal on which an audio signal is superimposed is input to the electrodes, the diaphragm vibrates according to the signal. However, in this capacitor-type speaker device, when a relatively large amplitude audio signal is input, the driving force may change significantly in a non-linear manner, and the sound quality of the reproduced sound may be relatively low.

The present invention is an example of a problem to deal with such a problem. That is, to provide a thin speaker device that can radiate a large volume of reproduced sound with a relatively simple structure, to reliably transmit the vibration of the voice coil to the diaphragm, and to obtain a speaker device with high reproduction efficiency, Provided is a thin speaker device capable of emitting high-quality reproduced sound with a relatively simple structure, and also provides a thin speaker device in which a diaphragm vibrates in substantially the same phase with a relatively simple configuration. In addition, an object of the present invention is to provide a thin speaker device while enabling high-quality and high-volume sound reproduction with a large-area diaphragm.

In order to achieve such an object, the speaker device according to the present invention includes at least the configuration according to the following independent claims.
[Claim 1] A diaphragm, a stationary part that supports the outer periphery of the diaphragm so as to freely vibrate along a vibration direction, and a back surface of the diaphragm are supported at a plurality of different locations, and an audio signal is applied to the diaphragm. A plurality of drive units for applying vibration, wherein the drive unit is capable of vibrating along a uniaxial direction in the magnetic gap and a magnetic circuit that forms a magnetic gap along a direction different from the vibration direction of the diaphragm. And a rigid vibration direction conversion unit that changes the direction of vibration of the voice coil and transmits the vibration to the diaphragm, and the vibration direction conversion unit is provided on the diaphragm side and the voice coil side. Each of the joint portions is formed obliquely with respect to the vibration direction of the voice coil, and each joint portion is formed near the center of the diaphragm with respect to the arrangement of the magnetic circuit. It is characterized by that Over mosquito devices.

It is explanatory drawing of a prior art. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an overall configuration of a speaker device according to an embodiment of the present invention (FIG. 1 (a) is a cross-sectional view taken along the line AA, and FIG. 2 (b) is a plan view with a diaphragm removed). It is explanatory drawing explaining the magnetic circuit and voice coil of the speaker apparatus which concern on embodiment of this invention. It is explanatory drawing explaining the magnetic circuit and voice coil of the speaker apparatus which concern on embodiment of this invention. It is explanatory drawing explaining the magnetic circuit and voice coil of the speaker apparatus which concern on embodiment of this invention. It is explanatory drawing explaining the magnetic circuit and voice coil of the speaker apparatus which concern on embodiment of this invention. It is explanatory drawing explaining the structural example and operation | movement of a vibration direction conversion part in the speaker apparatus which concern on embodiment of this invention. It is explanatory drawing explaining the structural example and operation | movement of a vibration direction conversion part in the speaker apparatus which concern on embodiment of this invention. It is explanatory drawing (one-sided sectional drawing with respect to the central axis O) which showed the structural example of the speaker apparatus provided with the vibration direction conversion part shown in FIG. It is explanatory drawing which shows the example of formation of the vibration direction conversion part in the speaker apparatus which concerns on embodiment of this invention (the figure (a) is a side view, the figure (b) is a perspective view, and the figure (c) is the figure. (B) A section enlarged view). It is explanatory drawing which shows the example of formation of the vibration direction conversion part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the specific example of the holding mechanism of the voice coil support part by a holding | maintenance part. It is explanatory drawing which showed the speaker apparatus which concerns on other embodiment of this invention. It is explanatory drawing which showed the speaker apparatus which concerns on other embodiment of this invention. It is explanatory drawing which showed the speaker apparatus which concerns on other embodiment of this invention. It is explanatory drawing which showed the speaker apparatus which concerns on other embodiment of this invention. It is explanatory drawing which showed the speaker apparatus which concerns on other 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.

[Overall configuration of speaker device; FIG. 2]
2A and 2B are explanatory views showing the overall configuration of the speaker device according to the embodiment of the present invention (FIG. 2A is a cross-sectional view taken along the line AA, and FIG. 2B is a plan view in a state where a diaphragm is removed. Figure). The speaker device 1 supports a diaphragm 10, a stationary part 100 that supports the outer periphery of the diaphragm 10 so as to freely vibrate along a vibration direction, and supports the back surface of the diaphragm 10 at a plurality of different locations, and generates a diaphragm by means of an audio signal. And a plurality of driving units 14 that apply vibration to the magnetic circuit 20. The driving unit 14 includes a magnetic circuit 20 that forms a magnetic gap 20 G along a direction different from the vibration direction of the diaphragm 10, and a uniaxial direction within the magnetic gap 20 G. The voice coil 30 is arranged so as to freely vibrate along a vibration direction, and a rigid vibration direction conversion unit 50 that changes the direction of the vibration of the voice coil 30 and transmits the vibration to the vibration plate 10. The joint portion 52 is formed on each of the side of the voice coil 30 and the link portion 51 is obliquely arranged with respect to the vibration direction of the voice coil 30. It is formed near the center of the diaphragm 10.

In the example shown in FIG. 2, the diaphragm 10 has a circular shape in plan view, but may have an elliptical shape, a rectangular shape in plan view as described later, or other shapes. In the illustrated example, the cross-sectional shape of the diaphragm 10 is a plane.

The stationary part 100 is a general term for parts that support vibrations such as the diaphragm 10 and the drive part 14. Here, the stationary part 100 is formed integrally with the frame 12 and the frame 12, or an attachment part 12 C attached to the frame 12. It corresponds to the stationary part 100. The stationary part 100 is not intended to be completely stationary per se, but is entirely oscillated under the influence of the vibration of the driving part 14 or other force. Also good. The outer peripheral portion of the diaphragm 10 is supported by a frame 12 that is a stationary portion 100 via an edge 11.

The drive unit 14 includes a magnetic circuit 20, a voice coil 30, and a vibration direction conversion unit 50. The voice coil 30 vibrates in a uniaxial direction along the magnetic gap 20G of the magnetic circuit 20, and the vibration is converted into a vibration direction conversion unit. 50 changes its direction and transmits it to the diaphragm 10. In the illustrated example, the voice coil 30 vibrates along the X-axis direction, and the diaphragm 10 is arranged so as to vibrate in the Z-axis direction perpendicular to the X-axis direction. The vibration in the direction is converted into a change in its oblique angle, and the diaphragm 10 is vibrated in the Z-axis direction.

The voice coil 30 is formed by winding a conducting wire to which an audio signal is input, and is itself oscillated on the stationary part 100 or can be oscillated on the stationary part 100 via the voice coil support part 40. Be placed. The voice coil support portion 40 can be formed of, for example, a flat insulating member, and the voice coil 30 is supported on the surface or inside thereof.

The voice coil 30 is held by the holding portion 15 on the attachment portion 12C that becomes the stationary portion 100. The holding unit 15 is configured to hold the voice coil 30 or the voice coil support unit 40 on the stationary unit 100 so as to be able to vibrate along the vibration direction (for example, the X-axis direction) and to prevent the voice coil 30 or the voice coil support unit 40 from moving in other directions. Have For example, the holding portion 15 can be deformed along the vibration direction (for example, the X-axis direction) of the voice coil 30, and can be formed by a curved plate member having rigidity in a direction crossing the vibration direction.

In such a speaker device 1, the same voice signal is input to the voice coils 30 of the plurality of drive units 14, so that each voice coil 30 vibrates along the same plane direction (for example, the X-axis direction or the Y-axis direction in the drawing). To do. As a result, the diaphragm 10 vibrates in a direction different from the vibration direction of the voice coil 30 (for example, the Z-axis direction in the drawing) via the vibration direction conversion unit 50 of each drive unit 14. The vibration direction is the acoustic radiation direction SD.

According to such a speaker device 1, since the plurality of drive units 14 that support the back surface of the diaphragm 10 at a plurality of different locations and apply vibrations by audio signals are provided, even the diaphragm 10 having a relatively large area is provided. The diaphragm 10 can be vibrated integrally. As a result, it is possible to suppress the generation of the divided vibration of the diaphragm 10 and realize high-quality reproduction. In addition, by increasing the area of the diaphragm 10, it is possible to obtain a high sound pressure during low sound reproduction with a small amplitude, and high-quality low sound reproduction becomes possible.

In addition, since the vibration direction of the voice coil 30 and the vibration direction of the diaphragm 10 are made different from each other by the vibration direction conversion unit 50, compared with the case where the voice coil 30 is vibrated along the vibration direction of the diaphragm 10. The back side of the diaphragm 10 can be reduced in thickness. As a result, a thin speaker device capable of reproducing the low sound range with high sound pressure can be obtained.

Further, since the vibration of the voice coil 30 is redirected by the vibration direction converter 50 and transmitted to the diaphragm 10, the speaker device 1 can be increased even if the amplitude of the diaphragm 10 is increased by increasing the amplitude of the voice coil 30. The thickness in the acoustic radiation direction (the overall height of the speaker device) does not increase. This makes it possible to obtain a thin speaker device that can emit a large volume of reproduced sound.

[Magnetic circuit / voice coil; FIGS. 3 to 6]
3 to 6 are explanatory views for explaining the magnetic circuit and the voice coil.

The magnetic circuit 20 for vibrating the voice coil 30 not only forms a magnetic gap 20G along the vibration direction of the voice coil 30, but also causes a current (voice current accompanying voice vibration) to flow through the voice coil 30. Thus, in order to apply the Lorentz force to the voice coil 30, the magnetic gap 20G forms a pair of magnetic fields in opposite directions. Thus, when an audio current flows through the voice coil 30, the voice coil 30 can vibrate along the arrangement direction of the magnetic gap 20G in which a pair of magnetic fields are formed.

The magnetic circuit 20 is formed by a magnet 21 and a yoke portion 22, and is formed by arranging a pair of magnetic gaps 20G that form magnetic fields opposite to each other in the Z-axis direction at predetermined intervals in the X-axis direction. The voice coil 30 is wound so that the currents flowing in the Y-axis direction are opposite to each other in the Y-axis direction, so that the Lorentz force along the X-axis direction acts on the voice coil 30. The magnetic circuit 20 having the same function as described above can be formed by arranging the magnet 21 and the yoke portion 22 in several different forms.

In the example shown in FIGS. 3 and 4, the magnetic circuit 20 includes a plurality of magnets 21 (21A to 21D). In the magnetic circuit 20, the magnets 21 are provided on both sides along the direction of the magnetic field of the magnetic gap 20G. In the illustrated example, the yoke portion 22 includes a lower yoke portion 22A, an upper yoke portion 22B, and a column portion 22C. The

yoke portions

22A and 22B are disposed substantially parallel to each other with a specified interval, and the column portion 22C is formed at the center portion so as to extend in a direction substantially orthogonal to the

yoke portions

22A and 22B. .

Magnets 21A to 21D are arranged in the

yoke portions

22A and 22B, and one magnetic gap 20G2 is formed by the magnet 21A and the magnet 21C, and another magnetic gap 20G1 is formed by the magnet 21B and the magnet 21D. The pair of magnetic gaps 20G1 and 20G2 are formed side by side in a plane, and magnetic fields in opposite directions are formed.

On the other hand, the voice coil 30 is formed in a substantially rectangular planar shape, and includes

linear portions

30A and 30C formed along the Y-axis direction and

linear portions

30B and 30D formed along the X-axis direction. It is configured. The

straight portions

30A and 30C of the voice coil 30 are arranged in each magnetic gap 20G of the magnetic circuit 20, and the direction of the magnetic field is defined so as to be along the Z-axis direction. It is preferable not to apply a magnetic field to the

straight portions

30B and 30D of the voice coil 30. Further, even when a magnetic field is applied to the

straight portions

30B and 30D, the Lorentz forces generated in the

straight portions

30B and 30D are configured to cancel each other. By making the number of turns of the voice coil 30 relatively large, a part of the voice coil 30 disposed in the magnetic gap 20G can be made relatively large, and a relatively large driving force can be obtained when the speaker is driven. it can.

In the illustrated example, an example is shown in which the voice coil 30 is supported by a voice coil support portion 40 made of an insulating flat plate 41, and an example in which an opening 41b is formed in the insulating flat plate 41 is shown. However, it is also possible to give the voice coil 30 rigidity and form the whole in a plate shape. When the voice coil 30 has rigidity, the voice coil support part 40 may not be used.

In the example shown in FIG. 4, the magnetic circuit 20 includes a plurality of magnets 21A to 21D such that the direction of the magnetic field applied to the straight part 30A of the voice coil 30 is opposite to the direction of the magnetic field related to the straight part 30C. On the other hand, the magnet 21A and the magnet 21C are magnetized in the same direction, and the magnet 21B and the magnet 21D are magnetized in the opposite direction. Magnetization of the magnet 21 can be performed after the magnet 21 and the yoke portion 22 are assembled, but in the example shown in FIGS. 3 and 4, it is necessary to perform the magnetizing process at that time twice.

On the other hand, in the example shown in FIGS. 5 and 6, the magnetic gap 20G2 is formed by

magnets

21A and 21C magnetized in the same direction, and the magnetic gap 20G1 is a yoke protrusion formed on each of the

yoke portions

22A and 22B. It is formed between the

portions

22a and 22b. According to this, the magnetizing process performed after assembling the magnet 21 and the yoke part 22 can be completed once, and the process can be simplified.

In the illustrated example,

positioning support portions

22A ₁ and 22B ₁ for positioning the yoke portion 22 on a stationary portion such as the attachment portion 12C are formed on the yoke portion 22 itself. According to this, the post portion 22C described above can be omitted, and the interval of the magnetic gap 20G is defined by the positioning of the yoke portion 22 with respect to the stationary portion such as the attachment portion 12C.
[Vibration direction conversion unit; FIGS. 7 to 11]
7 and 8 are explanatory diagrams for explaining a configuration example and operation of the vibration direction converter 50. The rigid vibration direction conversion unit 50 that changes the direction of the vibration of the voice coil 30 and transmits the vibration to the diaphragm 10 is formed with joints 52 on the diaphragm 10 side and the voice coil 30 side, respectively. It has the link part 51 inclined with respect to it. Here, the joint part 52 is a part that rotatably joins two rigid members, or a part that refracts or bends two integrated rigid parts. The joint portion 52 is a rigid portion formed at the end. Here, the rigidity means that it does not easily deform, and does not mean that it does not deform at all. The link portion 51 can be formed in a plate shape or a rod shape.

In the embodiment shown in FIG. 7, one link portion 51 is provided, joint portions 52 (52A, 52B) are formed at both ends thereof, and one joint portion 52A is an end portion of the voice coil 30 or the voice coil support portion 40. The other joint 52B is formed on the diaphragm 10 side. The joint part 52B may be connected to the diaphragm 10 or may be connected to the diaphragm 10 via another member.

FIG. 7A shows a case where the link portion 51 is at an intermediate position of vibration. The link portion 51 is obliquely provided at an angle θ ₀ between the voice coil 30 (or the voice coil support portion 40) and the diaphragm 10. At this time, the joint portion 52B on the diaphragm 10 side is disposed at a position Z ₀ away from the voice coil 30 along the vibration direction of the diaphragm 10 by a distance H ₀ . The vibration direction of the voice coil 30 (or the voice coil support portion 40) is regulated so as to vibrate in one axial direction (for example, the X-axis direction), and the diaphragm 10 has a direction different from the vibration direction of the voice coil 30 ( For example, the vibration direction is regulated so as to vibrate in the Z-axis direction).

As shown in FIG. (B), when moved to the formed at the end portion of the voice coil 30 joint portion 52A is the vibration direction from the initial position X ₀ (X axis direction) by [Delta] X ₁ reaches the position X ₁ The inclination angle of the link portion 51 is converted to θ ₁ (θ ₀ > θ ₁ ), and the position of the joint portion 52B on the diaphragm 10 side is moved by ΔZ _{1 in} the vibration direction (Z-axis direction) of the diaphragm 10. Thus, the position Z ₁ is reached. That is, the diaphragm 10 is pushed up along the vibration direction by ΔZ ₁ .

As shown in FIG. (C), the position X ₂ to move is formed on the end portion of the voice coil 30 joint portion 52A from the initial position X ₀ to the vibration direction (-X axis direction) by [Delta] X ₂ reaches Then, the inclination angle of the link portion 51 is converted to θ ₂ (θ ₀ <θ ₂ ), and the position of the joint portion 52B on the diaphragm 10 side is ΔZ _{2 in} the vibration direction (−Z axis direction) of the diaphragm 10. move and will reach the position Z _2. That is, the diaphragm 10 is pushed down along the vibration direction by ΔZ ₂ .

As described above, the function of the vibration direction conversion unit 50 including the link portion 51 and the joint portion 52 (52A, 52B) converts the vibration of the voice coil 30 into an angle change of the link portion 51 and transmits the change to the vibration plate 10, thereby transmitting the vibration plate. 10 is caused to vibrate in a direction different from the vibration direction of the voice coil 30.

FIG. 8 is an explanatory diagram for explaining another configuration example of the vibration direction conversion unit 50 and its operation. More specifically, FIG. 5B shows the state of the vibration direction converter 50 with the diaphragm 10 positioned at the reference position, and FIG. 6A shows the state where the diaphragm 10 is displaced toward the acoustic radiation side with respect to the reference position. FIG. 6C shows the state of the vibration direction conversion unit 50 in a state where the vibration plate 10 is displaced in the opposite direction with respect to the acoustic radiation side with respect to the reference position. (The diaphragm 10 is not shown).

The vibration direction conversion section 50 has a function of converting the angle by receiving a reaction force from the stationary section 100 where the link portion 51 is located on the opposite side to the diaphragm side. Specifically, the vibration direction conversion unit 50 includes a first link portion 51A having one end as a joint portion 52A on the voice coil 30 side and the other end as a joint portion 52B on the diaphragm 10 side, and one end serving as a first link portion. 51 has a second link part 51B having a joint part 52C with the intermediate part 51 and a joint part 52D with the stationary part 100 at the other end, and the first link part 51A and the second link part 51B are voiced. The coils 30 are inclined in different directions with respect to the vibration direction of the coil 30. More specifically, the vibration direction conversion unit 50 includes a first link portion 51A having one end as a first joint 52A on the voice coil 30 side and the other end as a second joint 52B on the diaphragm 10 side, A second link portion 51B having one end as a third joint portion 52C with the intermediate portion of the first link portion 51A and the other end as a fourth joint portion 52D with the stationary portion 100; The joint portion 52A, the second joint portion 52B, and the fourth joint portion 52D are on a circumference having a diameter substantially equal to the length of the first link portion 51A centered on the third joint portion 52C. It is in.

In the vibration direction conversion unit 50, the joint 52D is the only joint that does not change in position, and is supported by the stationary unit 100 (or the frame 12), and applies a reaction force from the stationary unit 100 to the link portion 51. ing. If a result, the voice coil 30 (or the voice coil support part 40) is moved from the reference position X ₀ to X-axis direction by [Delta] X _1, as shown in FIG. 8 (a), the inclined arranged in different directions 1 The link portion 51A and the second link portion 51B rise substantially at the same angle, and the joint portion 52B receives the reaction force from the stationary portion 100 at the joint portion 52D, and the joint portion 52B reliably moves the diaphragm 10 to the reference position Z _0. Is pushed up by ΔZ _{1 in the} Z-axis direction. When the voice coil 30 moves from the reference position X ₀ by ΔX _{2 in the} direction opposite to the X axis, as shown in FIG. 8C, the angle between the first link portion 51A and the second link portion 51B is almost equal. will be lowered the same angle, the joint portion 52B is reliably diaphragm 10 receives a reaction force from the stationary portion 100 by the joint portion 52D from the reference position Z ₀ and Z axis depressing the opposite direction by [Delta] Z _2.

Here, the length a of the link part from the joint part 52A to the joint part 52C, the length b of the link part from the joint part 52C to the joint part 52B, and the length c of the link part from the joint part 52C to the joint part 52D Are substantially equal, and the joint portion 52A and the joint portion 52D are preferably disposed substantially parallel to the moving direction of the voice coil 30. Such a link mechanism is known as a Scott Russell mechanism, and the

joint portions

52A, 52B, and 52D are located on the circumference of the length of the first link portion 51A (a + b = 2a) around the joint portion 52C. It is in. That is, the angle formed by the straight line passing through the joint part 52A and the joint part 52D and the straight line passing through the joint part 52B and the joint part 52D is always a right angle. As a result, when the voice coil 30 is moved in the X-axis direction, the joint portion 52B between the first link portion 51A and the diaphragm 10 always moves along the Z-axis perpendicular to the X-axis. 30 vibration directions can be converted to a direction perpendicular to the vibration direction and transmitted to the diaphragm 10.

FIG. 9 is an explanatory diagram showing a configuration example of the speaker device 1 including the vibration direction conversion unit 50 shown in FIG. In the example shown in FIG. 4A, the stationary part 100 is a part of the frame 12 that supports the diaphragm 10 and the driving part 14. The frame 12 has a flat bottom surface 12A, the diaphragm 10 is supported to face the bottom surface 12A of the frame 12, the magnetic gap 20G is formed along the bottom surface 12A of the frame 12, and the vibration direction changing unit 50 is a frame. The diaphragm 10 is vibrated in a direction intersecting the bottom surface 12A by a reaction force from the bottom surface 12A. In the example shown in FIG. 5B, the magnetic circuit 20 includes at least a magnet 21 (21A, 21C) and a yoke portion 22 (22A, 22B), and the stationary portion 100 is formed by the yoke portion 22 (22B). Yes. As shown in FIG. 4B, the stationary part 100 is formed by the yoke part 22, and by making the yoke part 22 a part of the support member, the speaker device 1 can be further reduced in thickness.

10 and 11 are explanatory views showing examples of forming the vibration direction changing portion 50 (FIG. 10A is a side view, FIG. 10B is a perspective view, and FIG. 10C is an enlarged view of the A portion. ). As described above, the vibration direction converter 50 includes the link portion 51 and joint portions 52 (52A, 52B) formed at both ends thereof. In the illustrated example, connection portions 53 (a first connection portion 53A and a second connection portion 53B) are formed on both ends of the link portion 51 via joint portions 52. Here, the first connecting portion 53A is a portion that is connected to the voice coil 30 or the voice coil support portion 40 and vibrates integrally with the voice coil 30, and the second connecting portion 53B is connected to the diaphragm 10 to vibrate. It is a portion that vibrates integrally with the plate 10.

In the vibration direction conversion unit 50, a link portion 51,

joint portions

52A and 52B, and first and

second connection portions

53A and 53B are integrally formed, and the

joint portions

52A and 52B include the

joint portions

52A and 52B. It is formed of a continuous member that can be refracted continuously at both sides across the board. Here, the continuous member may be a member that forms the entirety of the link portion 51 and the first and

second connection portions

53A and 53B, or the link portion 51 and the first and

second connection portions

53A and 53B. The member which forms a part of may be sufficient.

When the vibration direction conversion part 50 is formed of a plate-like member, the joint part 52 is formed in a linear shape extending in the width direction as shown in FIG. Further, since the link portion 51 is required to be rigid and the joint portion 52 is required to be refractable, the thickness t2 of the joint portion 52 with respect to the thickness t1 of the link portion 51 or the connecting portion 53. Is formed in a thin shape, so that different properties are given to the integral member.

Further, the change in thickness between the joint portion 52 and the link portion 51 is formed in an inclined surface shape, and

inclined surfaces

51t and 53t whose surfaces face each other at the end portions on both sides of the joint portion 52 are formed. Thereby, when the angle of the link part 51 is changed, it is possible to prevent the thickness of the link part 51 from interfering with the angle change.

In the example shown in FIG. 11, a rigid member is integrated with a refractive continuous member to form a link portion 51 or a connecting portion 53, and the joint portion 52 is a portion only of the continuous member. In the example shown in FIG. 5A, a rigid member 50Q is attached to the surface of a continuous member 50P, which is a bendable sheet-like member, to form a link portion 51 or a connecting portion 53. According to this, the continuous member 50P is continuously extended in the part of the both sides straddling the joint part 52, and the joint part 52 is formed by this continuous member 50P so that bending is possible. On the other hand, the link portion 51 or the connecting portion 53 in which the rigid member 50Q is attached to the continuous member 50P is formed in a portion having rigidity.

In the example shown in FIG. 5B, the link member 51 or the connecting member 53 is formed by attaching the rigid member 50Q so as to sandwich the continuous member 50P. Again, the portion where the rigid member 50Q is not attached becomes the joint portion 52. In the example shown in FIG. 5C, the rigid member forming the link portion 51 is formed by laminating multilayer rigid members 50Q1 and 50Q2. In addition, in the same figure (c), you may make the multilayer rigid member 50Q1 into the structure substantially the same as the multilayer rigid member 50Q2. In this way, by partially attaching the rigid member 50Q to the refracting continuous member 50P, the refracting joint portion 52, the rigid link portion 51, and the connecting portion 53 can be integrally formed.

The continuous member 50P preferably has a strength and durability sufficient to withstand the refraction of the joint portion 52 that is repeated when the speaker device is driven, and has a flexibility that does not emit sound when the refraction operation is repeated. As a specific example, the continuous member 50P can be formed of a woven or non-woven fabric of high-strength fibers. Examples of woven fabrics include plain weaves of uniform materials, plain weaves with different warp and weft yarns, plain weaves with alternate yarn materials, plain weaves with twisted yarns, and plain weaves of assortment. Can be triaxial, tetraaxial weave, triaxial, tetraaxial fabric, knitted, unidirectionally aligned fibers, and the like.

When using high-strength fibers in whole or in part, by arranging the high-strength fibers along the vibration direction of the voice coil 30, sufficient strength against vibration of the voice coil 30 can be obtained. When warp and weft are both high-strength fibers, both the warp and wefts are evenly tensioned and the durability is improved by tilting the fiber direction by about 45 ° with respect to the vibration direction of the voice coil 30. Can do. As the high-strength fiber, an aramid fiber, a carbon fiber, a glass fiber, or the like can be used. Further, in order to adjust physical properties such as bending stress and rigidity of the continuous member, a dumping agent (damping agent, braking material) may be applied (applied).

The rigid member 50Q is preferably lightweight, easy to mold and rigid after curing, and thermoplastic resin, thermosetting resin, metal, paper, etc. can be used. After the rigid member 50Q is formed into a plate shape, the vibration direction changing portion 50 can be formed by adhering to the surface of the portion of the continuous member 50P excluding the joint portion 52 with an adhesive. When a thermosetting resin is used as the rigid member 50Q, the vibration direction changing portion 50 is formed by partially impregnating the resin in the link portion 51 and the connecting portion 53 of the fibrous continuous member 50P and then curing the resin. can do. When resin or metal is used as the rigid member 50Q, the continuous member 50P and the rigid member 50Q can be integrated in the link portion 51 and the connecting portion 53 by insert molding.

[Holding part (damper); FIG. 12]
The holding unit 15 holds the voice coil 30 or the voice coil support unit 40 at a predetermined position in the magnetic gap 20G so that the voice coil 30 does not contact the magnetic circuit 20, and holds the voice coil 30 or the voice coil support unit 40. It is supported so as to vibrate linearly along the vibration direction (X-axis direction). The holding unit 15 restricts the voice coil support unit 40 from moving in a direction different from the vibration direction of the voice coil support unit 40, for example, in the Z-axis direction or the Y-axis direction. The holding portion 15 can be deformed along the vibration direction of the voice coil 30 and can be formed by a curved plate member having rigidity in a direction crossing the vibration direction.

FIG. 12 is an explanatory view showing a specific example of a holding mechanism of the voice coil support unit 40 by the holding unit 15. Although the voice coil support portion 40 is held here, the voice coil 30 can also be held directly. The holding portion 15 is formed of, for example, a conductive metal, and is electrically connected to the end of the voice coil 30 or the voice coil lead wire 43 from the end at the end on the voice coil support portion 40 side. Is electrically connected to the audio signal input terminal. As described above, the holding portion 15 itself may be a vibration wiring made of a conductive metal, or the holding portion 15 may be a wiring board (for example, a linear wiring is formed on the substrate). . As described above, the voice coil 30 has a substantially rectangular planar shape, and

linear portions

30A and 30C formed along the Y-axis direction and linear portions 30B formed along the X-axis direction. , 30D. The

straight portions

30A and 30C of the voice coil 30 are arranged in the magnetic gap 20G of the magnetic circuit 20, and are defined so that the direction of the magnetic field is along the Z-axis direction.

In the illustrated example, the holding portion 15 is a curved plate-like member that allows deformation in one direction along the vibration direction of the voice coil support portion 40 and restricts deformation in the other direction. Is held approximately symmetrically. In the illustrated example, one end of each end of the holding portion 15 is attached to the voice coil support portion 40 side by the connection portion 15X, and the other end is attached to the frame side by the connection portion 15Y. The

connection portions

15X and 15Y are made of an insulator such as resin, and the voice coil lead wire 43 drawn from the voice coil 30 is electrically connected to the holding portion 15 using solder or the like. 15 is electrically connected to the audio signal input terminal.

Further, the

connection portions

15X and 15Y may form an electrical connection terminal, and the connection portion 15X is connected to the end portion of the voice coil 30 or the voice coil lead wire 43 drawn from the end portion. The unit 15Y may be electrically connected to the audio signal input terminal.

A lead wire used in a conventional speaker device vibrates when the speaker device is driven. Therefore, in order to prevent the lead wire from contacting a member constituting the speaker device, such as a frame, in a predetermined space. It is necessary to route the lead wire, which is one factor that hinders the thinning of the speaker device. However, since the voice coil lead wire 43 is formed on the voice coil support portion 40 as in the example of FIG. 12, it is not necessary to provide a predetermined space for routing the voice coil lead wire 43. It is possible to reduce the thickness.

The other end of the holding portion 15 is attached to the connecting portion 15Y, and the connecting portion 15Y supports the holding portion 15 on the frame so that the voice coil support portion 40 basically vibrates in the X-axis direction. Further, since the voice coil lead wire 43 extends to the conductive holding portion 15 and is electrically connected, the voice coil lead wire 43 and the holding portion 15 can be prevented from being disconnected, and the reliability of the speaker device can be reduced. Can be improved.

The holding portion 51 made of a conductive metal that is a curved plate-like member allows the movement of the voice coil support portion 6 in the direction along the X axis due to the deformation of the holding portion 15, and the curved plate in the direction along the Z axis. The movement is restricted by the high rigidity of the member. Therefore, the voice coil support portion 40 is always maintained at a predetermined height with respect to the frame in the Z-axis direction. Further, by providing the holding portion 5 substantially symmetrically, the movement of the voice coil support portion 40 in the Y direction is in a balanced state due to the elastic force of the holding portion 15, which is also held at a predetermined position with respect to the frame. Has been.

[Driver arrangement]
In the speaker device 1 according to the embodiment of the present invention, each joint portion 52 in the vibration direction conversion unit 50 described above is formed near the center of the diaphragm 10 with respect to the arrangement of the magnetic circuit 20. Further, as shown in FIG. 2, the plurality of driving units 14 are disposed to face each other along an axis of symmetry when the diaphragm 10 is viewed in plan. In addition, the plurality of driving units 14 are arranged at substantially equal positions from the center of the diaphragm 10. In addition, the magnetic circuit 20 is supported on the stationary part 100 (frame 12) near the outer periphery of the diaphragm 10.

With such an arrangement, even if the area of the diaphragm 10 is large, it can be vibrated integrally, and the divided vibration of the diaphragm 10 is suppressed, and the reproduction band is expanded. Can expand the bass reproduction limit (lower range). Since the outer peripheral portion of the diaphragm 10 supported by the stationary portion 100 (frame 12) via the edge 11 is a drive support portion, the diaphragm 10 is slightly located near the center during driving. It will vibrate while being bent in a concavo-convex shape, and the direction of sound radiation can be expanded to the surroundings.

[Other forms of speaker device]
FIGS. 13 to 17 are explanatory views showing speaker devices according to other embodiments of the present invention (FIGS. 13 to 15 and FIG. 16A are plan views in a state where a diaphragm is removed, and FIG. (b), (c), and FIG. 17 are sectional views). The parts common to the above-described embodiment are given the same reference numerals, and the description given above is used.

The speaker device 1 (1A to 1F) shown in FIG. 13 to FIG. 15 is a modified example related to the arrangement of the plurality of driving units 14. In the example shown in FIG. 13A, the central axis S of the voice coil 30 in the drive unit 14 is shifted by a predetermined dimension with respect to the symmetry axes L 1 and L 2 of the diaphragm 10. The illustrated e1, e2, e3, and e4 are the shift amounts. Each shift amount e1, e2, e3, e4 may be the same or different values, and may be zero (no shift). In the example shown in FIG. 13A, the vibration direction of the voice coil 30 is parallel or perpendicular to the symmetry axis L1 or L2.

In the example shown in FIG. 13B, the central axis S of the voice coil 30 in the drive unit 14 is shifted by a predetermined angle with respect to the symmetry axes L1 and L2 of the diaphragm 10. The illustrated θ1, θ2, θ3, and θ4 are the shift amounts. The shift amounts θ1, θ2, θ3, and θ4 may be the same or different values, and may be zero (not shifted). Further, in combination with the example shown in FIG. 13A, the center axis S of the voice coil 30 is shifted by the predetermined dimensions e1, e2, e3, e4 with respect to the symmetry axes L1, L2 of the diaphragm 10, and further The angle may be shifted by e1, e2, e3, e4.

In the example shown in FIG. 14A, the drive unit 14 is arranged at a point-symmetrical position with respect to the center O of the diaphragm 10. In the illustrated example, three drive units 14 arranged on the back surface of the diaphragm 10 are provided. However, the number is not limited to this, and may be five, six,. In the example shown in FIG. 14B, one or more of the drive units 14 in the example shown in FIG. 14A are shifted from the point symmetry position by a predetermined dimension or a predetermined angle.

The example shown in FIG. 15 is an example in which the diaphragm 10 is rectangular. In the example shown in FIG. 10A, the drive unit 14 is disposed oppositely along the symmetry axes L1 and L2 when the diaphragm 10 is viewed in plan, and the example shown in FIG. The vibration direction of the voice coil 30 is shifted by a predetermined angle with respect to the example shown in a). Not limited to this, in combination with the example shown in FIG. 13A, the center axis S of the voice coil 30 is shifted by the predetermined dimensions e1, e2, e3, e4 with respect to the symmetry axes L1, L2 of the diaphragm 10. May be.

In this way, by changing the position of the drive unit 14 disposed on the back side of the diaphragm 10 and changing the support position of the diaphragm 10 to an arbitrary position, the vibration direction of the diaphragm 10 is set to a specific direction. It is possible to shift, and the divided vibration of the diaphragm 10 can be suppressed.

In the speaker device 1 (1G to 1I) shown in FIG. 16, an opening 10P is formed at a substantially central portion of the diaphragm 10. In the speaker device 1 according to the embodiment of the present invention, since the drive unit 14 can be installed on the peripheral side of the diaphragm 10, a space below the substantially central portion of the diaphragm 10 can be made, and an opening 10 P is formed in this space. This can be used as an installation space for various components.

In the example shown in FIG. 5B, a high-pitched sound reproduction speaker 200 is provided in the opening 10P. When the diaphragm 10 has a large area, the speaker device 1 includes a plurality of driving units 14 having the vibration direction conversion unit 50, so that a thin and high-quality bass reproduction speaker can be obtained. On the other hand, by disposing the high-pitched sound reproduction speaker 200 substantially at the center of the diaphragm 10, a speaker system having a wide reproduction band can be constructed with high space efficiency.

In the example shown in FIG. 5C, an attachment member 201 for attaching the speaker device to the opening 10P is provided. By providing such an attachment member 201, the speaker device 1 can be firmly attached to the non-attached portion. For example, when the speaker device 1 is embedded in a wall surface or is a wall-mounted type, the attachment member 201 can be used to make a strong attachment.

Speaker device 1 (1K, 1L) shown in FIG. 17 comprises a plurality of diaphragm 10 to sound emission direction is different (10 _1, 10 _2), the drive unit 14, the diaphragm 10 (10 _1, 10 ₂ ) A plurality of each is provided. In the example shown in FIG. 2A, the back space of the diaphragm 10 (10 ₁ , 10 ₂ ) communicates within the frame 12. In the example shown in FIG. 5B, the high-frequency sound reproduction speaker 200 is provided in the opening 10P formed in each of the diaphragms 10 (10 ₁ , 10 ₂ ).

[Advantages and application examples of speaker devices]
Since the speaker device 1 according to the embodiment of the present invention changes the direction of the vibration of the voice coil 30 by the vibration direction conversion unit 50 and transmits it to the diaphragm 10, the amplitude of the voice coil 30 is increased to increase the vibration of the diaphragm 10. Even if the amplitude is increased, the thickness of the speaker device 1 in the acoustic radiation direction (the total height of the speaker device) does not increase. This makes it possible to obtain a thin speaker device that can emit a large volume of reproduced sound.

Further, since the vibration direction converter 50 reliably transmits the vibration of the voice coil 30 to the diaphragm 10 by a mechanical link mechanism having a relatively simple structure, a speaker device with high reproduction efficiency can be obtained while realizing a reduction in thickness. Therefore, it is possible to emit a high-quality reproduced sound with a relatively simple structure.

In addition, since the back surface of the diaphragm 10 is supported by a plurality of drive units 14 at different positions, the diaphragm 10 can be vibrated integrally even if the diaphragm 10 is large in area. High-quality reproduced sound can be radiated while suppressing the divided vibration of. In particular, it is effective when low-frequency sound reproduction is performed by increasing the area of the diaphragm 10, and high-quality low-frequency sound reproduction is possible while lowering the speaker device thickness, and the low-frequency sound reproduction limit is further lowered. The playback band can be expanded.

As described above, the speaker device 1 according to the embodiment of the present invention can be reduced in thickness and can be increased in volume. Such a speaker device 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. The electronic device 2 such as a mobile phone or a portable information terminal shown in FIG. 1A or the electronic device 3 such as a flat panel display shown in FIG. Since the space can be reduced, the entire electronic device can be made thinner. In addition, sufficient audio output can be obtained even in a thin electronic device. FIG. 19 is an explanatory view showing an automobile provided with a speaker according to an embodiment of the present invention. In the automobile 4 shown in the figure, the space in the vehicle can be expanded by making the speaker device 1 thinner. In particular, in the case where the speaker device 1 according to the embodiment of the present invention is installed on the door panel, the protrusion of the door panel is eliminated and the operation space of the driver can be expanded. Also, since sufficient audio output can be obtained, music and radio broadcasting can be enjoyed comfortably in the car 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, each of the above-described embodiments can divert each other's technology as long as there is no particular contradiction or problem in its purpose and configuration.
Further, the technology in each of the above-described embodiments can be applied to a dynamic speaker device that uses a flat voice coil as necessary (eg, a riffel speaker device, a ribbon speaker device, a sound emitting side of a flat voice coil). In addition, the present invention can be applied to a speaker device in which a magnetic pole portion is disposed on the side opposite to the acoustic radiation side, and the speaker device can be thinned.
PCT / JP2008 / 051197 filed internationally on January 28, 2008, PCT / JP2008 / 68580 filed internationally on October 14, 2008, PCT / JP2009 / 050764 filed internationally on January 20, 2009, All the contents described in PCT / JP2008 / 069480 filed internationally on October 27, 2008 are incorporated in this application.

Claims

A diaphragm,
A stationary portion that supports the outer periphery of the diaphragm so as to vibrate freely along the vibration direction;
A plurality of drive units for supporting the back surface of the diaphragm at a plurality of different locations and applying vibration to the diaphragm by an audio signal;
The drive unit is
A magnetic circuit that forms a magnetic gap along a direction different from a vibration direction of the diaphragm;
A voice coil disposed in the magnetic gap so as to vibrate along a uniaxial direction;
A rigid vibration direction conversion unit that converts the direction of vibration of the voice coil and transmits the vibration to the diaphragm,
The vibration direction conversion unit has a link portion that is inclined with respect to the vibration direction of the voice coil by forming joints on the diaphragm side and the voice coil side, respectively.
The speaker device, wherein each joint portion is formed closer to the center of the diaphragm with respect to the arrangement of the magnetic circuit.
The speaker device according to claim 1, wherein the plurality of driving units are arranged to face each other along an axis of symmetry in plan view of the diaphragm.
The speaker device according to claim 2, wherein the plurality of driving units are arranged at substantially equal positions from the center of the diaphragm.
The speaker device according to claim 1, wherein the plurality of driving units are arranged at point-symmetrical positions with respect to a center of the diaphragm.
The speaker device according to claim 1, wherein the diaphragm has a substantially circular or elliptical planar shape.
The speaker device according to claim 1, wherein the diaphragm has a substantially rectangular planar shape.
The speaker device according to claim 1, wherein a cross-sectional shape of the diaphragm is substantially flat.
The speaker device according to claim 1, wherein an opening is formed in a substantially central portion of the diaphragm.
The speaker device according to claim 8, wherein the opening is provided with a speaker for high-pitched sound reproduction.
The speaker device according to claim 8, wherein the opening is provided with a mounting member for attaching the speaker device.
The diaphragm includes a plurality of diaphragms having different acoustic radiation directions,
The speaker device according to claim 1, wherein a plurality of the drive units are installed on each of the diaphragms.
2. The speaker device according to claim 1, wherein the link portion receives the reaction force from the stationary portion located on the opposite side to the diaphragm side and converts the angle.
The speaker device according to claim 12, wherein the stationary part is a part of a frame that supports the diaphragm and the driving part.
The frame has a flat bottom surface, the diaphragm is supported to face the bottom surface of the frame, the magnetic gap is formed along the bottom surface of the frame, and the vibration direction changing portion is a bottom surface of the frame. The speaker device according to claim 13, wherein the diaphragm is vibrated in a direction intersecting with the bottom surface by a reaction force from.
The speaker device according to claim 14, wherein an outer peripheral portion of the diaphragm is supported by the frame via an edge.
13. The speaker device according to claim 12, wherein the magnetic circuit includes at least a magnet and a yoke portion, and the stationary portion is formed by the yoke portion.
The magnetic circuit arranges a pair of magnetic gaps in which magnetic fields in opposite directions are formed along the vibration direction of the voice coil,
The speaker device according to claim 1, wherein the voice coil is formed in a planar shape and is formed in an annular shape so that a current flows in the opposite direction through the pair of magnetic gaps.
The speaker device according to claim 17, wherein the voice coil has a linear portion that is disposed in each of the pair of magnetic gaps and intersects a vibration direction of the voice coil.
The speaker device according to claim 1, wherein the magnetic circuit is supported by the stationary part in the vicinity of the outer periphery of the diaphragm.
The speaker device according to claim 1, further comprising: a holding portion that holds the voice coil in the stationary portion so as to freely vibrate along a vibration direction and restricts the voice coil from moving in other directions.
The speaker device according to claim 20, wherein the holding portion is deformable along a vibration direction of the voice coil, and is formed of a curved plate member having rigidity in a direction intersecting the vibration direction.
2. The speaker device according to claim 1, wherein the vibration direction changing portion is formed by a plate-like member having a linear refracting portion, and the refracting portion is the joint portion.
The speaker device according to claim 22, wherein an inclined surface is formed at one end of the link portion.
The vibration direction converter is
A first link portion having one end as a joint on the voice coil side and the other end as a joint on the diaphragm side;
A second link portion having one end as a joint with the intermediate portion of the first link portion and the other end as a joint with the stationary portion;
The speaker device according to claim 1, wherein the first link portion and the second link portion are arranged to be inclined in different directions with respect to a vibration direction of the voice coil.
The vibration direction conversion unit includes a first link portion having one end as a first joint portion on the voice coil side and the other end as a second joint portion on the diaphragm side;
A second link portion having one end as a third joint portion with the intermediate portion of the first link portion and the other end as a fourth joint portion with the stationary portion;
The first joint, the second joint, and the fourth joint are
The speaker device according to claim 1, wherein the speaker device is on a circumference having a diameter substantially equal to a length of the first link portion centered on the third joint portion.
An automobile comprising the speaker device according to claim 1.
An electronic apparatus comprising the speaker device according to claim 1.
A building comprising the speaker device according to claim 1.