WO2010106687A1

WO2010106687A1 - Speaker device

Info

Publication number: WO2010106687A1
Application number: PCT/JP2009/055528
Authority: WO
Inventors: 靖昭小笠原; 孝治前川
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

Abstract

A speaker device with a wide reproduction band can be installed even in a place where a sufficiently wide installation space cannot be saved. A speaker device (1) is provided with a first diaphragm (10₁) and a second diaphragm (10₂), a stationary section (100) for vibratably supporting the outer peripheries of the first diaphragm (10₁) and the second diaphragm (10₂) along the vibration directions thereof, and a driving unit (14) for simultaneously vibrating the first diaphragm (10₁) and the second diaphragm (10₂) in response to an audio signal. 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 first diaphragm (10₁), a voice coil (30) vibratably disposed along a uniaxial direction in the magnetic gap (20G) and imparting vibration along the uniaxial direction to the second diaphragm (10₂), 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 first diaphragm (10₁).

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.

Also, if the bass reproduction limit is lowered by increasing the diaphragm area, the treble reproduction limit is generally lowered and the reproduction efficiency in the high range is lowered. In order to solve this problem, a speaker system in which a speaker device (tweeter) for high-pitched sound reproduction is separately provided has been constructed, but this requires a large installation space for the speaker device. There is a problem that a sufficient installation space cannot be secured if the vehicle is installed in a vehicle with limited space or installed in a relatively small room. Therefore, there is a problem that the reproduction band of the speaker device cannot be widened where the installation space as described above cannot be secured.

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, it is possible to provide a low-profile speaker device while enabling high-quality and high-volume sound reproduction with a large-area diaphragm, and a speaker device with a wide reproduction band can be installed even when a sufficiently large installation space cannot be secured. Is the object of the present invention.

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 first diaphragm and a second diaphragm, a stationary part that supports the outer peripheries of the first diaphragm and the second diaphragm in a freely vibrating manner along a vibration direction, and an audio signal A drive unit configured to vibrate the first diaphragm and the second diaphragm simultaneously, and the drive unit forms a magnetic gap along a direction different from a vibration direction of the first diaphragm. A circuit, a voice coil disposed in the magnetic gap so as to freely vibrate along a uniaxial direction, and applying a vibration along the uniaxial direction to the second diaphragm; A speaker device comprising: a rigid vibration direction conversion unit that transmits to the first diaphragm.

It is explanatory drawing of a prior art. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which showed the whole structure of the speaker apparatus based on embodiment of this invention (the figure (a) is AA sectional drawing, the figure (b) is a top view). BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which showed the whole structure of the speaker apparatus based on embodiment of this invention (the figure (a) is AA sectional drawing, the figure (b) is a top view). BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which showed the whole structure of the speaker apparatus based on embodiment of this invention (the figure (a) is AA sectional drawing, the figure (b) is a top view, The figure (c) is a diaphragm. Illustration). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing the overall configuration of a speaker device according to an embodiment of the present invention (the same (a) to (c) are different types of speaker devices). 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 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 (the figure (a) is AA sectional drawing, the figure (b) is a top view). It is explanatory drawing which showed the speaker apparatus which concerns on other embodiment of this invention (the figure (a) is AA sectional drawing, the figure (b) is a top view). It is explanatory drawing which showed the speaker apparatus which concerns on other embodiment of this invention (the figure (a) is AA sectional drawing, the figure (b) is a top view). It is explanatory drawing which showed the speaker apparatus which concerns on other embodiment of this invention (the figure (a), (b) is explanatory drawing which showed the example of a different form). It is explanatory drawing which showed the speaker apparatus which concerns on other embodiment of this invention (the figure (a), (b), (c) is explanatory drawing which showed the example of a different form)). It is explanatory drawing which showed the speaker apparatus which concerns on other embodiment of this invention (the figure (a), (b) is explanatory drawing which showed the example of a different form). 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; FIGS. 2 to 5]
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). The speaker device 1 supports the first diaphragm 10 ₁ and the second diaphragm 10 _2, and the outer peripheries of the first diaphragm 10 ₁ and the second diaphragm 10 _{2 so} as to freely vibrate along the vibration direction. The stationary unit 100 and a driving unit 14 that simultaneously vibrates the first diaphragm 10 ₁ and the second diaphragm 10 ₂ by an audio signal. The driving unit 14 has a vibration direction of the _first diaphragm 10 _1. the magnetic circuit 20 to form a magnetic gap 20G along different directions, to vibrate freely arranged along the axial direction in the magnetic gap 20G, giving a vibration along the axial direction on the second diaphragm 10 ₂ It includes a voice coil 30, and a vibration direction conversion portion 50 of the rigid tell diaphragm 10 ₁ first by redirecting the vibration of the voice coil 30.

The first diaphragm 10 _1, in the example shown in FIG. 2, although a plan view is rectangular, substantially circular or substantially elliptical shape, or may be of other shapes. Further, the illustrated example, the first diaphragm 10 _first cross-sectional shape is flat, may have a cross-sectional shape of the V-shape or U-shape. The first diaphragm 10 ₁ is supported by the frame 12 is a stationary unit through an edge 11. The first diaphragm 10 _1, is used having a rigidity, for example, bass reproduction is possible as a relatively large diameter (large area). The second diaphragm 10 _2, for example, as capable of reproducing high-frequency sound, is used a relatively small diameter (small area). In the illustrated example, the first diaphragm 10 _first oscillation direction and a second vibration direction of the diaphragm 10 ₂ a are substantially perpendicular, the first diaphragm 10 ₁ and second diaphragm 10 ₂ stationary portion It is supported on 100 substantially orthogonal support surfaces so as to vibrate freely. More specifically, the first diaphragm 10 ₁ is supported on the upper surface 12U of the frame 12, a second diaphragm 10 ₂ is supported on the side surface 12S of the frame 12.

The stationary part 100 is a general term for parts that support vibrations such as the first and

second diaphragms

10 ₁ , 10 ₂ and the drive part 14, and is here formed integrally with the frame 12 and the frame 12? Alternatively, the attachment portion 12 </ b> C attached to the frame 12 corresponds to the stationary portion 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 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 conveys to the first diaphragm 10 ₁ by redirecting. In the illustrated example, the voice coil 30 vibrates along the X-axis direction and at the same in the Z-axis direction orthogonal first diaphragm 10 ₁ are arranged so as to be vibration, the vibration direction conversion unit 50, a voice coil It converts the vibration in the X-axis direction of 30 to a change in its oblique angle at which, and the first diaphragm 10 ₁ is vibrated in the Z-axis direction. Further, the vibration of the voice coil 30 in the X-axis direction is transmitted to the _second diaphragm 102 as it is.

Vibration direction conversion unit 50 is obliquely set link portion with respect to the vibration direction of the first diaphragm 10 ₁ side and the joint portions 52 to each of the voice coil 30 side (52A, 52B) the voice coil 30 to form a 51. One end side of the link part 51 is rotatably connected to the voice coil 30 or the voice coil support part 40 directly or via another member via the joint part 52A, and the other end side of the link part 51 is connected via the joint part 52B. Are connected to the _first diaphragm 101 directly or through another member.

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. Here, an example using the voice coil support unit 40 is shown. The voice coil support part 40 can be omitted, and the voice coil 30 itself can have rigidity. In the illustrated example, the vibration direction end portion of the voice coil support portion 40 is directly connected to the _second diaphragm 102.

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, a voice signal is input to the voice coil 30 of the drive unit 14, so that the voice coil 30 vibrates along one axis direction (for example, the X axis direction in the drawing). This first diaphragm 10 ₁ via a vibration direction conversion unit 50 of the driving unit 14 vibrates in different directions (e.g., the Z-axis direction) and the vibration direction of the voice coil 30. The vibration direction is the acoustic radiation direction SD ₁ of the first diaphragm 10 ₁ . The second diaphragm 10 ₂ is vibrated along a vibration direction of the voice coil 30. The vibration direction is the acoustic radiation direction SD ₂ of the second diaphragm 10 ₂ .

According to such a speaker device 1, the first diaphragm 10 ₁ and the second diaphragm 10 ₂ can be vibrated simultaneously by the single drive unit 14. As a result, the plurality of

diaphragms

10 ₁ , 10 ₂ can be vibrated while suppressing the space required for installing the drive unit 14 to expand the reproduction band and the acoustic radiation direction. The first diaphragm 10 ₁ to the diaphragm for bass reproduction, for example, large diameter (large area), by a diaphragm for high-frequency band reproduction of the second diaphragm 10 _2, for example, small diameter (small area) Thus, it is possible to obtain a speaker device for wide-band reproduction ranging from high to low while reducing the installation space.

Further, the vibration direction conversion unit 50, since the vibration direction and a first vibrating direction of the vibrating plate 10 ₁ of the voice coil 30 are in different directions, the voice coil 30 along a first vibrating direction of the vibrating plate 10 ₁ as compared with the case to vibrate and become the first rear side of the diaphragm 10 ₁ can be thinned. Since the vibration direction converter 50 is formed by a mechanical link mechanism, the vibration of the voice coil 30 can be reliably transmitted to the _first diaphragm 101 and high sound pressure can be reproduced. Thus, when the first diaphragm 10 ₁ for bass reproduction can be obtained a thin speaker device capable of reproducing the bass at high sound pressure.

Further, since the first transmitted to the diaphragm 10 ₁ by redirecting the vibration of the voice coil 30 by the vibration direction conversion unit 50, by increasing the amplitude of the voice coil 30, a first amplitude of the vibration plate 10 ₁ be increased, the thickness of the sound emission direction SD ₁ of the first diaphragm 10 ₁ does not become thick. Thus, a thin speaker device that can radiate a loud reproduction sound can be obtained with respect to the acoustic radiation direction SD ₁ of the first diaphragm 10 ₁ .

The second diaphragm 10 _2, since it is vibrated along a vibration direction of the voice coil 30, the vibration of the voice coil 30 is transmitted directly, it is possible to reproduce the high band. Since the voice coil 30 or the voice coil support portion 40 extends along the X-axis direction, the speaker device 1 needs a space in the X-axis direction to vibrate the voice coil 30, but the thickness direction intersects with the space. Space in the (Z-axis direction) can be reduced.

FIG. 3 is an explanatory view showing the overall configuration of a speaker device according to another embodiment of the present invention (FIG. 3A is a cross-sectional view taken along the line AA, and FIG. 3B is a plan view). The same parts as those of the speaker device 1 described above are denoted by the same reference numerals, and redundant description is omitted. The speaker apparatus 1 (1A), the first diaphragm 10 _first oscillation direction and a second direction of vibration applied to the diaphragm 10 ₂ is substantially vertical, the first diaphragm 10 ₁ and the second oscillation The plate 10 ₂ is supported on a substantially orthogonal support surface of the stationary part 100 (frame 12) so as to freely vibrate. The acoustic radiation direction SD ₁ of the _first diaphragm 10 _{1 and} the acoustic radiation of the second diaphragm 10 ₂ are supported. as direction SD ₂ substantially coincide, there is provided a sound reflecting plate 70 on the front surface of the second diaphragm 10 _2. According to this, in addition to the characteristics of the speaker device 1 described above, the sound radiated from the second diaphragm 10 ₂ can be effectively heard on the front surface of the _first diaphragm 101.

4A and 4B are explanatory views showing an overall configuration of a speaker device according to another embodiment of the present invention (FIG. 4A is a cross-sectional view taken along the line AA, FIG. 4B is a plan view, and FIG. c) is an explanatory diagram of the diaphragm). The same parts as those of the speaker device 1 described above are denoted by the same reference numerals, and redundant description is omitted. The speaker device 1 (1B), the first diaphragm 10 _first oscillation direction and a second direction of vibration applied to the diaphragm 10 ₂ a are substantially perpendicular, the second diaphragm 10 _2, the one end attached to the vibrating direction end portion of the voice coil support part 40 for supporting the voice coil 30 or the voice coil 30, the other end is attached to the stationary portion 100 (frame 12) through the edge 11 _2. In this example, the second diaphragm 10 _2, 4 that can be formed in a curved plate shape as shown in (c), one side the voice coil 30 or the voice coil support part of the two opposite sides 40 is connected to one end, the other side is connected to the frame 12 via an edge 11 _2. Also in this way, in addition to the characteristics of the speaker device 1 described above, the sound radiated from the second diaphragm 10 ₂ can be effectively heard on the front surface of the _first diaphragm 101.

FIG. 5 is an explanatory view showing the overall configuration of the speaker device according to the embodiment of the present invention (the same (a) to (c) are different types of speaker devices). The same parts as those of the speaker device 1 described above are denoted by the same reference numerals, and redundant description is omitted. Example shown in FIG. (A) ~ (d) are each vibration direction conversion unit 50 for vibrating the first diaphragm 10 ₁ between the magnetic circuit 20 and the second diaphragm 10 ₂ Has been deployed.

The speaker device 1 shown in FIG. (A) (1C), the first diaphragm 10 _first oscillation direction and a second vibration direction of the diaphragm 10 ₂ is substantially vertical, the first diaphragm 10 ₁ When the second diaphragm 10 ₂ is supported freely vibrating the support surface substantially perpendicular to the stationary portion 100. More specifically, the first diaphragm 10 ₁ is supported on the upper surface 12U of the frame 12, a second diaphragm 10 ₂ is supported on the side surface 12S of the frame 12. The speaker device 1 (1D) shown in FIG. 10B is the same as the speaker device 1C shown in FIG. 10A, in which the voice coil 30 or the voice coil support portion 40 is held in the Z-axis direction by a holding portion (damper) 72. It is what I supported.

The speaker device 1 shown in FIG. (C) (1E), the first diaphragm 10 _first oscillation direction and a second direction of vibration applied to the diaphragm 10 ₂ is substantially perpendicular, the second diaphragm 10 ₂ has one end attached to the voice coil 30 or the vibration direction end of the voice coil support 40 that supports the voice coil 30, and the other end attached to the stationary part 100 (frame 12) via the edge 11 _2. ing.
The speaker device 1 (1F) shown in FIG. 6D is the same as the speaker device 1E shown in FIG. 4C, but the voice coil 30 or the voice coil support portion 40 is held in the Z-axis direction by the holding portion (damper) 72. It is what I supported.

[Magnetic circuit / voice coil; FIGS. 6 to 9]
6 to 9 are explanatory diagrams for explaining the magnetic circuit and the voice coil.
The magnetic circuit 20 for vibrating the voice coil 30 not only forms the magnetic gap 20G along the vibration direction of the voice coil 30, but also causes a current (voice current accompanying the voice signal) 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. 6 and 7, 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. 6, the magnetic circuit 20 includes a plurality of magnets 21A to 21D so that the direction of the magnetic field applied to the linear portion 30A of the voice coil 30 is opposite to the direction of the magnetic field related to the linear portion 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. 6 and 7, it is necessary to perform the magnetizing process at that time twice.

On the other hand, in the example shown in FIGS. 8 and 9, 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. 10 to 13]
10 and 11 are explanatory diagrams for explaining a configuration example and operation of the vibration direction converter 50. Rigid vibration direction conversion unit 50 of the tell first diaphragm 10 ₁ by redirecting the vibration of the voice coil 30, the joint portion 52 is formed in each of the first diaphragm 10 ₁ side and the voice coil 30 side The link portion 51 is provided obliquely with respect to the vibration direction of the voice coil 30. 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. 10, 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. are formed on, the other joint portion 52B is formed on the first diaphragm 10 ₁ side. Joint 52B may be is connected to the first diaphragm 10 _1, the first diaphragm 10 ₁ may be connected via other members.

FIG. 10A shows a case where the link portion 51 is at an intermediate position of vibration. Link portion 51 is obliquely disposed at an angle theta ₀ between the voice coil 30 (or the voice coil support portion 40) and the first diaphragm 10 _1. At this time, the first diaphragm 10 ₁ side of the joint portion 52B is disposed at a position Z ₀ at a distance H ₀ from the voice coil 30 along a first vibrating direction of the vibrating plate 10 _1. Voice coil 30 (or the voice coil support part 40), a uniaxial direction (e.g., X-axis direction) vibration direction is restricted to oscillate in the first diaphragm 10 ₁ and the vibration direction of the voice coil 30 The vibration direction is regulated so as to vibrate in different directions (for example, 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 is converted inclination angle of the link portion 51 to _{_{_{θ 1 (θ 0> θ 1}}} ), the position of the first diaphragm 10 ₁ side of the joint portion 52B is first diaphragm 10 ₁ oscillation direction (Z-axis It will reach the position Z ₁ moves in the direction) by [Delta] Z _1. That is, the first diaphragm 10 ₁ 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 _first diaphragm 101 side is the vibration direction (−Z axis direction) of the diaphragm 10. Is moved by ΔZ ₂ to reach position Z ₂ . That is, the first diaphragm 10 ₁ is pushed down along the vibration direction by ΔZ ₂ .

Thus the linkage part 51 and the joint portion 52 (52A, 52B) functions in the vibration direction conversion unit 50 consisting of the the diaphragm 10 ₁ first is converted into an angle change of the link portion 51 to the vibration of the voice coil 30 reportedly, the vibration direction of the first diaphragm 10 _the voice coil 30 is to vibrate in different directions.

FIG. 11 is an explanatory diagram for explaining another configuration example of the vibration direction conversion unit 50 and its operation. In particular, FIG. (B) The state of the vibration direction conversion unit 50 in a state in which the first diaphragm 10 ₁ is positioned at the reference position, and FIG. (A) the first diaphragm 10 ₁ a reference position displaced in the opposite direction with respect to the acoustic radiation side to the acoustic radiation displaced by the state to which the vibration direction conversion unit 50 to the side state, FIG. (c) the first diaphragm 10 ₁ a reference position for shows the state of the vibration direction conversion unit 50 of the state are (first diaphragm 10 ₁ are not shown).

The vibration direction conversion unit 50 has a function of converting the angle by receiving a reaction force from the stationary unit 100 where the link portion 51 is located on the side opposite 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 has a first link 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 _first diaphragm 101 side. A portion 51A and 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 are provided. The diameter of the first joint portion 52A, the second joint portion 52B, and the fourth joint portion 52D is approximately equal to the length of the first link portion 51A centered on the third joint portion 52C. On the circumference.

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. As a result, when the voice coil 30 (or the voice coil support portion 40) is moved by ΔX _{1 in the} X-axis direction from the reference position X ₀ , as shown in FIG. link portions 51A and results in the angle of the second link portion 51B rises substantially the same angle, the diaphragm 10 _first joint portion 52B is surely first receives a reaction force from the stationary portion 100 by the joint portion 52D Push up by ΔZ ₁ from the reference position Z _{0 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. 11C, the angles of the first link portion 51A and the second link portion 51B are almost equal. It will be lowered same angle, in the direction opposite to the Z axis of the diaphragm 10 _first joint portion 52B is surely first receives a reaction force from the stationary portion 100 by the joint portion 52D from the reference position Z ₀ by [Delta] Z ₂ Press down.

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. Thus, when moving the voice coil 30 in the X-axis direction, to the first link portion 51A includes a joint portion 52B of the first diaphragm 10 ₁ always moves along the X-axis and a Z axis perpendicular becomes, the vibration direction of the voice coil 30 can be transmitted to the first diaphragm 10 ₁ converts the vertical direction therewith.

12 and 13 are explanatory views showing examples of formation of the vibration direction conversion section 50 (FIG. 12 (a) is a side view, FIG. 12 (b) is a perspective view, and FIG. 12 (c) is an enlarged view of the A section). ). 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 connection portion 53A is a portion that is connected to the voice coil 30 or the voice coil support portion 40 directly or via another member and vibrates integrally with the voice coil 30, and the second connection portion 53B is is a portion that vibrates the first diaphragm 10 ₁ integrally coupled directly or through another member to the first diaphragm 10 _1.

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. Such is provided a second connecting portion 53B, by the link portion 51 so as to support the diaphragm 10 _first extensive and Fudai 1, the first diaphragm 10 ₁ to vibrate in the same phase Can do.

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. 13, a rigid member is integrated with a refractive continuous member to form a link part 51 or a connecting part 53, and the joint part 52 is a part of only 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. 14]
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. 14 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. 14, there is no need to provide a predetermined space for routing the voice coil lead wire 43, and the speaker device can be 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.

[Other forms of speaker device]
15 to 20 are explanatory views showing a speaker device according to another embodiment of the present invention. The parts common to the above-described embodiment are given the same reference numerals, and the description given above is used. The embodiment shown in FIGS. 15 to 20, the drive unit 14 is provided with a plurality, the plurality of given vibration to the first diaphragm 10 _first one by the drive unit 14, by each of the plurality of driving portions 10 ₂ It is characterized in that given a vibration in a separate second diaphragm 10 _2.

According to such a speaker device 1 (1G to 1P), the back surface of the _first diaphragm 101 is supported at a plurality of different locations, and a plurality of drive units 14 that provide vibration by an audio signal are provided. It is the first diaphragm 10 ₁ area, comprising a first diaphragm 10 ₁ can be vibrated integrally. This suppresses the occurrence of the first divided vibration of the vibration plate 10 _1, it is possible to realize reproduction of high sound quality. By increasing the first area of the diaphragm 10 _first becomes a high sound pressure at the low-frequency sound reproduction can be obtained with a small amplitude, it is possible to bass reproduction of high quality.

The speaker device 1 (1G to 1H) shown in FIGS. 15 to 17 (FIG. 15A is a cross-sectional view taken along the line AA, and FIG. 15B is a plan view) has a plurality of drive units 14 arranged to face each other. , each joint portion 52 of the one driving portion 14 is formed on the first diaphragm 10 _first inboard with respect to the arrangement of the magnetic circuit 20. According to this, since the magnetic circuit 20 can be arranged separately in the frame 12, the heat generated from the plurality of driving units 14 does not affect the both, and the heat loss of the voice coil 30 or the heat of the magnetic circuit 20 occurs. Problems such as demagnetization can be eliminated. In addition, since the magnetic circuit 20 can be disposed near the side wall of the frame 12, heat generated from the voice coil 30 in the magnetic circuit 20 can be quickly radiated through the side wall of the frame 12.

Figure 15 speaker apparatus shown in 1 (1G), the first diaphragm 10 _first oscillation direction and a second vibration direction of the diaphragm 10 ₂ is substantially vertical, the first diaphragm 10 ₁ and the second diaphragm 10 ₂ of the support surface (upper surface 12U, side 12S) substantially perpendicular to the stationary portion 100 (frame 12) is oscillating freely supported. In the illustrated example, the first diaphragm 10 ₁ has a rectangular shape in plan view, and the second diaphragm 10 ₂ is disposed on opposite side surfaces of the box-shaped frame 12.

Speaker device 1 (IH) shown in FIG. 16, the first diaphragm 10 _first oscillation direction and a second direction of vibration applied to the diaphragm 10 ₂ a are substantially perpendicular, the first diaphragm 10 ₁ The second diaphragm 10 ₂ is supported on a substantially orthogonal support surface (upper surface 12U, side surface 12S) of the stationary part 100 (frame 12) so as to vibrate freely, and the acoustic radiation direction of the _first diaphragm 101 and the second direction. The acoustic reflector 70 is provided on the front surface of the _second diaphragm 102 so that the acoustic radiation directions of the _second diaphragm 102 are substantially coincident. Acoustic emission opening 71 for emitting the second sound from the vibration plate 10 ₂ to the first sides of the diaphragm 10 ₁ rectangular is provided.

Speaker device 1 (1I) of FIG. 17, the first diaphragm 10 _first oscillation direction and a second direction of vibration applied to the diaphragm 10 ₂ is substantially perpendicular, the second diaphragm 10 ₂ one end is attached to the vibrating direction end portion of the voice coil support part 40 for supporting the voice coil 30 or the voice coil 30, the other end is attached to the stationary portion 100 (frame 12) through the edge 11 _2. Acoustic emission opening 71 for emitting the second sound from the vibration plate 10 ₂ to the first sides of the diaphragm 10 ₁ rectangular is provided.

The speaker device (1J, 1K) illustrated in FIG. 18 is an explanatory diagram illustrating a configuration example of the speaker device including the vibration direction conversion unit 50 illustrated in FIG. In the example shown in FIG. 6 (a), the stationary unit 100 is a part of the frame 12 for supporting the first diaphragm 10 ₁ and the drive unit 14. Frame 12 has a flat bottom surface 12A, the first diaphragm 10 ₁ 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, the vibration direction converter part 50 has a first diaphragm 10 ₁ in a direction transverse to the bottom surface 12A is vibrated by a reaction force from the bottom surface 12A of the frame 12. 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.

In the speaker device 1 (1L to 1N) illustrated in FIG. 19, a plurality of driving units 14 are arranged to face each other, and the magnetic circuit 20 in one driving unit 14 is first with respect to each joint unit 52 of the driving unit 14. It is disposed closer to the center of the diaphragm 10 _first. To obtain such an arrangement of the magnetic circuit 20, the speaker device 1L ~ 1N is vibration direction conversion unit 50 between the magnetic circuit 20 and the second diaphragm 10 ₂ is disposed. With this arrangement of the drive unit 14, the magnetic circuits 20 of the plurality of drive units 14 can be collected near the center of the frame 12, so that the drawer is drawn from the voice coil 30 arranged in the magnetic circuit 20. The wires can be intensively connected to the terminals, and the handling of the lead wires can be simplified.

The speaker device 1 shown in FIG. (A) (1L), the first diaphragm 10 _first oscillation direction and a second vibration direction of the diaphragm 10 ₂ is substantially vertical, the first diaphragm 10 ₁ When the second diaphragm 10 ₂ supporting surface (upper surface 12U, side 12S) substantially perpendicular to the stationary portion 100 (frame 12) is oscillating freely supported. The speaker device 1 shown in FIG. (B) (1M), the first diaphragm 10 _first oscillation direction and a second direction of vibration applied to the diaphragm 10 ₂ is substantially vertical, the first diaphragm 10 ₁ and the second diaphragm 10 ₂ are supported on a support surface (upper surface 12U, side surface 12S) substantially orthogonal to the stationary part 100 (frame 12) so as to vibrate freely, and the acoustic radiation of the _first diaphragm 101 is obtained. as direction and the second sound emission direction of the diaphragm 10 ₂ almost coincide, it is provided with a sound reflecting plate 70 on the front surface of the second diaphragm 10 _2. The speaker device 1 shown in FIG. (C) (1N), the first diaphragm 10 _first oscillation direction and a second direction of vibration applied to the diaphragm 10 ₂ is substantially perpendicular, the second diaphragm 10 ₂ has one end attached to the voice coil 30 or the vibration direction end of the voice coil support 40 that supports the voice coil 30, and the other end attached to the stationary part 100 (frame 12) via the edge 11 _2. ing.

Example shown in FIG. 20 (the speaker device 1O, 1P), the planar shape of the first diaphragm 10 ₁ and the frame 12 is an example is substantially circular. Similar to the figure, the planar shape may be substantially elliptical. In this example, the plurality of driving units 14 are arranged at substantially equal positions from the center of the first diaphragm. This is the first diaphragm 10 ₁ well-balanced support. Example shown in FIG. (A) is arranged a magnetic circuit 20 on the periphery side of the first diaphragm 101, are arranged vibration direction conversion unit 50 to the first diaphragm 10 _first inboard. Example shown in FIG. (B) is arranged a magnetic circuit 20 closer to the center of the first diaphragm 101, are arranged vibration direction conversion unit 50 to the first diaphragm 10 ₁ near close. The second diaphragm 10 ₂ is more arranged at predetermined intervals in the first periphery of the diaphragm 10 _1, depending on the arrangement of the drive unit 14.

[Advantages and application examples of speaker devices]
The first diaphragm 10 ₁ and the second diaphragm 10 ₂ can be vibrated simultaneously by one drive unit 14. As a result, the plurality of

diaphragms

10 ₁ , 10 ₂ can be vibrated while suppressing the space required for installing the drive unit 14 to expand the reproduction band and the acoustic radiation direction. The first diaphragm 10 ₁ to the diaphragm for bass reproduction, for example large diameter (large area), by a diaphragm for high-frequency band reproduction of the second diaphragm 10 _2, for example, small diameter (small area) Thus, it is possible to obtain a speaker device that reproduces a wide band from high to low while reducing the installation space.

Speaker apparatus 1 according to an embodiment of the present invention, since the first transmitted to the diaphragm 10 ₁ by redirecting the vibration of the voice coil 30 by the vibration direction conversion unit 50, by increasing the amplitude of the voice coil 30, even by increasing the first amplitude of the vibration plate 10 _1, the thickness of the first diaphragm 10 _first sound emission direction is not thick. This makes it possible to obtain a thin speaker device that can emit a large volume of reproduced sound.

Further, the vibration direction converter 50 reliably transmits the vibration of the voice coil 30 to the first diaphragm 10 ₁ and the second diaphragm 10 ₂ by a mechanical link mechanism having a relatively simple structure. Thus, a speaker device with high reproduction efficiency can be obtained, and high-quality reproduced sound can be emitted with a relatively simple structure.

In the case where a plurality of driving units 14 are arranged, the back surface of the first diaphragm 10 ₁ is supported by the plurality of driving units 14 at different positions, so that the first diaphragm 10 ₁ has a large area. can also becomes possible to vibrate integrally with the first diaphragm 10 _1, it emits a high-quality reproduced sound which suppresses divided vibration of the first diaphragm 10 _1. In particular, by increasing the first area of the diaphragm 10 ₁ is effective in performing bass reproduction while achieving thinning of the speaker device, as well as a possible high-quality bass reproduction, larger reproduction band It becomes possible to do.

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. 21 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. 22 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 first diaphragm and a second diaphragm;
A stationary portion that supports the outer peripheries of the first diaphragm and the second diaphragm so as to freely vibrate along a vibration direction;
A drive unit that vibrates the first diaphragm and the second diaphragm simultaneously with 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 first diaphragm;
A voice coil disposed in the magnetic gap so as to freely vibrate along a uniaxial direction, and applying a vibration along the uniaxial direction to the second diaphragm;
A loudspeaker apparatus comprising: a rigid vibration direction conversion unit that changes a direction of vibration of the voice coil and transmits the vibration to the first diaphragm.
The vibration direction conversion unit includes a link portion formed obliquely with respect to the vibration direction of the voice coil by forming a joint portion on each of the first diaphragm side and the voice coil side. The speaker device according to claim 1.
The speaker device according to claim 1, wherein a vibration direction of the first diaphragm and a vibration direction applied to the second diaphragm are substantially perpendicular.
4. The speaker device according to claim 3, wherein the first diaphragm and the second diaphragm are supported on a substantially orthogonal support surface of the stationary portion so as to freely vibrate.
The acoustic reflector is provided on the front surface of the second diaphragm so that the acoustic radiation direction of the first diaphragm and the acoustic radiation direction of the second diaphragm substantially coincide with each other. 4. The speaker device according to 4.
One end of the second diaphragm is attached to the vibration direction end of the voice coil or a voice coil support part that supports the voice coil, and the other end is attached to the stationary part via an edge. The speaker device according to claim 3.
A plurality of the drive units are provided,
Vibration is applied to one of the first diaphragms by the plurality of driving units,
The speaker device according to claim 2, wherein each of the plurality of driving units applies vibration to the individual second diaphragm.
The plurality of driving units are arranged to face each other.
The speaker device according to claim 7, wherein each joint portion of the one driving portion is formed closer to the center of the first diaphragm with respect to the arrangement of the magnetic circuit.
The plurality of driving units are arranged to face each other.
The speaker device according to claim 7, wherein the magnetic circuit in one of the driving units is disposed closer to the center of the first diaphragm with respect to each joint of the driving unit.
The speaker device according to claim 7, wherein the plurality of driving units are arranged at substantially equal positions from the center of the first diaphragm.
The speaker device according to claim 1, wherein the first diaphragm has a substantially circular or elliptical planar shape.
The speaker device according to claim 1, wherein the first diaphragm has a substantially rectangular planar shape.
3. The speaker device according to claim 2, wherein the link portion receives the reaction force from the stationary portion located on the opposite side to the first diaphragm side and converts the angle.
14. The speaker device according to claim 13, wherein the stationary part is a part of a frame that supports the first diaphragm and the driving part.
The frame has a flat bottom surface, the first 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 unit is The speaker device according to claim 14, wherein the diaphragm is vibrated in a direction intersecting the bottom surface by a reaction force from the bottom surface of the frame.
14. The speaker device according to claim 13, 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, 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.
20. The speaker device according to claim 19, wherein the holding portion is deformable along a vibration direction of the voice coil, and is formed by a curved plate member having rigidity in a direction intersecting the vibration direction.
3. The speaker device according to claim 2, wherein the vibration direction converter 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 21, 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 2, wherein the first link portion and the second link portion are inclined in different directions with respect to the 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 first 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
3. The speaker device according to claim 2, wherein the speaker device is located on a circumference having a diameter substantially equal to a length of the first link portion centered on the third joint portion.
The speaker device according to claim 1, wherein the first diaphragm is a diaphragm for low-pitched sound reproduction, and the second diaphragm is a diaphragm for high-pitched sound reproduction.
The vibration direction converter has one end connected to the voice coil directly or via another member so that the angle can be changed, and the other end can be directly changed or changed to the diaphragm by the angle. Connected,
The speaker device according to claim 1, wherein the speaker device is disposed obliquely with respect to each of a vibration direction of the diaphragm and a moving direction of the driving unit.
The speaker device according to claim 1, wherein the vibration direction conversion section includes a link mechanism that changes an angle of a link portion formed between the voice coil and the diaphragm.
28. The speaker device according to claim 27, wherein the link mechanism performs angle conversion in response to a reaction force from a stationary portion where the link portion is located on the side opposite to the diaphragm.
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.