WO2010106690A1

WO2010106690A1 - Magnetic circuit for speaker device and speaker device

Info

Publication number: WO2010106690A1
Application number: PCT/JP2009/055534
Authority: WO
Inventors: 博之小林; 泰久阿部
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: JPWO2010106690A1

Abstract

Provided is a magnetic circuit for a speaker device to achieve a reduction in the thickness of a diaphragm in the vibration direction thereof while the sufficient amplitude of the diaphragm is ensured. A magnetic circuit (20) is used in a speaker device (1) in which a voice coil (30) formed in a planar shape is vibratably supported in a uniaxial direction (X-axis direction) along a plane on which the voice coil (30) is formed, a diaphragm (10) is vibratably supported in a direction (Z-axis direction) intersecting with the uniaxial direction, the direction of vibration of the voice coil (30) is changed and the vibration changed in direction is transmitted to the diaphragm (10). In the magnetic circuit, a magnetic pole member (20A) is disposed on one side of a space partitioned by the voice coil (30), and the magnetic pole member is provided with a magnet (21) magnetized in the uniaxial direction.

Description

Magnetic circuit for speaker device and speaker device

The present invention relates to a magnetic circuit for a speaker device and 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, this 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 portion 51J, the magnet 52J, and the plate 53J, and the voice coil 611J are arranged. And a magnetic circuit having a magnetic gap formed thereon. 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 configured to be substantially the same direction. 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 joint between 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), the thickness (e) of the yoke portion 51J of the magnetic circuit, and the like. 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.

As a means to solve this problem, it is conceivable to change the direction of vibration of the voice coil to a direction different from that of the diaphragm, and mechanically change the direction of the vibration of the voice coil and transmit it to the diaphragm. If this is realized, even if the vibration stroke of the voice coil is increased, this does not directly affect the thickness of the speaker device, and a thin speaker device can be realized. In order to achieve this and obtain a thin speaker device, it becomes a problem how to flatten the drive system including the magnetic circuit. If the cylindrical voice coil bobbin as in the prior art is simply tilted in a direction different from the vibration direction of the diaphragm, the thickness of the magnetic circuit increases and it is difficult to reduce the thickness. There is a demand for a magnetic circuit in which the voice coil itself is planar, the voice coil is reciprocally oscillated in a planar manner, and the thickness thereof is reduced.

The present invention is an example of a problem to deal with such a problem. That is, it is possible to provide a thin speaker device that can emit a large volume of reproduction sound with a relatively simple structure, a flat voice coil that can achieve a thin speaker device, and a thin voice device that drives the voice coil It is an object of the present invention to obtain an improved magnetic circuit.

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

[Claim 1] A planar voice coil and the voice coil vibrate in a uniaxial direction along a plane on which the voice coil is formed, and the direction-converted vibration of the voice coil is transmitted to the uniaxial direction. A magnetic circuit used in a speaker device including a diaphragm that vibrates in a direction that intersects with a voice coil, wherein a magnetic pole member is disposed on one side of a space partitioned by the voice coil, and the magnetic pole member is magnetized in the uniaxial direction. A magnetic circuit for a speaker device comprising a magnet.

[Claim 14] A stationary part and a vibrating part supported by the stationary part so as to freely vibrate, wherein the stationary part includes a magnetic circuit, and the vibrating part has a voice coil formed in a planar shape, The voice coil is supported so as to be able to vibrate in a uniaxial direction along a plane on which the voice coil is formed, and a vibration plate is supported so as to be able to vibrate in a direction intersecting the uniaxial direction. The magnetic circuit has a magnetic pole member disposed on one side of a space partitioned by the voice coil, and the magnetic pole member is magnetized in the uniaxial direction. A speaker device comprising a magnet.

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, The figure (c) is operation explanatory drawing. ). 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). It is explanatory drawing explaining the magnetic circuit for speaker apparatuses concerning embodiment of this invention (the figure (a) is a perspective view, the figure (b) is sectional drawing). It is explanatory drawing (sectional drawing) which showed the structural example of the magnetic circuit for speaker apparatuses which concerns on embodiment of this invention. It is explanatory drawing (sectional drawing) which showed the structural example of the magnetic circuit for speaker apparatuses which concerns 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 shows the structural example of the vibration direction conversion part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the structural example of the vibration direction conversion part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the structural example of the vibration direction conversion part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the structural example 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 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 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 and 3]
2 and 3 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, FIG. 2B is a plan view, and FIG. (C) is an operation explanatory diagram). The speaker device 1 includes a stationary unit 100 and a vibrating unit 110 that is supported by the stationary unit 100 so as to freely vibrate. The stationary unit 100 includes a magnetic circuit 20, and the vibrating unit 110 has a planar shape. And a voice coil 30 supported so as to be able to vibrate in one axis direction (for example, the X-axis direction) along the plane, and supported so as to be able to vibrate in a direction crossing the one-axis direction (for example, the X-axis direction) (for example, the Z-axis direction) And a rigid vibration direction converter 50 that changes the direction of the vibration of the voice coil 30 and transmits the vibration to the diaphragm 10, and the magnetic circuit 20 is arranged on one side of a space partitioned by the plane of the voice coil 30. The magnetic pole member 20A is disposed on the magnetic pole member 20A, and the magnetic pole member 20A includes a magnet 21 magnetized in a uniaxial direction.
In addition, the magnetic pole member should just be provided with the magnet magnetized at least by the uniaxial direction, and may be provided with another magnetic body (for example, yoke part etc. mentioned later) as needed. Further, the uniaxial direction does not need to be in the plane on which the voice coil is formed, and may be slightly inclined with respect to the plane, such as the magnetizing direction of the magnet shown in FIG. I do not care.

In the magnetic circuit 20, the magnetic flux that exits from one magnetic pole of the magnet 21 and passes through the voice coil 30 traverses the first portion 30a that intersects one axial direction (for example, the X-axis direction) of the voice coil 30, and The magnetic flux that passes through and enters the other magnetic pole of the magnet 21 crosses the second portion 30b that intersects one axial direction (for example, the X-axis direction) of the voice coil 30. The speaker device 1 provided with such a magnetic circuit 20 vibrates the voice coil 30 in a uniaxial direction (for example, the X-axis direction) along the plane of the voice coil 30, changes the direction of the vibration, and vibrates the voice coil 30. In the speaker device that transmits to the vibration plate 10 that vibrates in a direction intersecting with (for example, the Z-axis direction), the magnetic circuit 20 is not bulky in the vibration direction of the vibration plate 10, and an extremely thin speaker device can be obtained.

In the example shown in FIG. 2, the diaphragm 10 is rectangular in plan view and has a flat cross section. The form of the diaphragm 10 is not limited to this, and is a form having a substantially V-shaped (cone-shaped) or substantially U-shaped (dome-shaped) cross section, or a substantially circular or substantially elliptical shape in plan view. Etc.

The stationary part 100 is a general term for parts that support vibrations such as the diaphragm 10 and the voice coil 30, and the frame 12 corresponds to the stationary part 100 here. Although the stationary part 100 includes the magnetic circuit 20, the magnetic circuit 20 itself can also be the stationary part 100. The stationary part 100 itself is not intended to be completely stationary, and the whole stationary part 100 vibrates due to the influence of vibration of the driving part 14 described later or other forces. There may be. The outer peripheral portion of the diaphragm 10 is supported by a frame 12 that is a stationary portion 100 via an edge 11. In the illustrated example, the stationary part 100 is disposed above and below the voice coil 30, the magnetic circuit 20 is disposed on the stationary part 100 on the upper side of the voice coil 30, and from the voice coil 30 to the stationary part 100 on the upper side of the voice coil 30. The distance is larger than the distance from the voice coil 30 to the stationary part 100 below the voice coil 30. An arrangement space for the magnetic circuit 20 is secured at a distance to the upper stationary portion 100.

As shown in FIG. 2C, the drive unit 14 includes a magnetic circuit 20, a voice coil 30, and a vibration direction conversion unit 50, and the vibration unit 110 includes the voice coil 30 (voice coil support unit). 40), the vibration direction changing part 50, the diaphragm 10, the holding part 15 to be described later, and the like. The voice coil 30 faces the magnetic circuit 20 and vibrates in one axial direction, and the vibration direction conversion unit 50 changes the direction and transmits the vibration to the diaphragm 10. In the illustrated example, the voice coil 30 vibrates along the X-axis direction, and the diaphragm 10 is supported so as to freely vibrate in the Z-axis direction orthogonal to the X-axis direction. The vibration in the direction is converted into a change in its oblique installation angle, and the diaphragm 10 is vibrated in the Z-axis direction.

The voice coil 30 is formed, for example, by winding a conducting wire to which an audio signal is input, or is formed of an annular conductive member, and is itself supported by the stationary portion 100 so as to be able to vibrate, or the voice coil It is supported by the stationary part 100 via the support part 40 so as to freely vibrate. 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 support portion 40 can be omitted by providing the voice coil 30 with rigidity so as to have a flat plate shape.

The voice coil 30 is held by the holding unit 15 so as to vibrate freely on the stationary unit 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 is formed of a curved plate-like member having rigidity in a direction crossing the vibration direction.

The magnetic circuit 20 includes a magnet 21 in which a magnetic pole member 20A is disposed on one side of a space partitioned by a plane of the voice coil 30, and the magnetic pole member 20A is magnetized in the vibration direction (for example, the X-axis direction) of the voice coil 30. . The magnetic pole member 20 A may be disposed on one side of the voice coil 30, and may be on the upper side of the voice coil 30 as illustrated or on the lower side of the voice coil 30. Regarding the arrangement of the magnets 21, various forms to be described later can be implemented. In FIG. 2, three magnets are arranged in the X-axis direction, and the magnetic pole portion 20 G 1 with the N poles facing each other The magnetic pole portion 20G2 that faces the first portion 30a that intersects with the S poles faces the second portion 30b that intersects the X-axis direction of the voice coil 30. A pair of magnetic fields whose directions are opposite to each other are formed under the magnetic pole portions 20G1 and 20G2, and the first portion 30a and the second portion 30b of the voice coil 30 are disposed in each of the magnetic fields.

The speaker device 1 (1A) shown in FIG. 3 is an example in which the above-described drive unit 14 is disposed so as to be opposed to each other on the left and right sides. . By providing a plurality of driving units 14 in this way, one diaphragm 10 can be driven with a relatively large driving force.

The speaker device 1 (1 A) inputs the same audio signal to the voice coils 30 of the plurality of drive units 14, so that the voice coils 30 are close to or separated from each other along one axis direction (for example, the X axis direction in the drawing). Vibrate. 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 speaker devices

1, 1 A, the vibration of the voice coil 30 is changed in direction by the vibration direction conversion unit 50 and transmitted to the diaphragm 10, so that the amplitude of the voice coil 30 is increased in order to increase the amplitude of the diaphragm 10. Even if is increased, it is possible to prevent the thickness of the speaker device 1 in the acoustic radiation direction (the overall height of the speaker device) from increasing. This makes it possible to obtain a thin speaker device that can emit a large volume of reproduced sound.

Further, since the magnetic pole member 20A of the magnetic circuit 20 is provided only on one side of the voice coil 30, the installation of the magnetic circuit 20 is space-saving compared to the case where the magnetic pole member is disposed on both sides of the voice coil to form a magnetic gap. Can be In particular, in the embodiment of the present invention, since the space along the vibration direction of the diaphragm 10 can be reduced, the overall height of the

speaker devices

1 and 1A can be further reduced.

As in the example shown in FIG. 3, in the case where a plurality of driving units 14 are provided, the diaphragm 10 can be supported at a plurality of locations and can be vibrated with a large driving force. The entire surface of the diaphragm 10 can be vibrated at substantially the same phase. If the area of the diaphragm 10 is increased, it is possible to obtain a high sound pressure during low sound reproduction with a smaller amplitude, so that high-quality low sound reproduction with relatively low distortion is possible, and the low sound reproduction band is low. It becomes possible to spread to the side.

[Magnetic circuit for speaker device (magnetic circuit / voice coil); FIGS. 4 to 6]
4 to 6 are explanatory diagrams for explaining the magnetic circuit for the speaker device (the magnetic circuit 20 and the voice coil 30).
The magnetic circuit 20 for oscillating the voice coil 30 has a portion that intersects with the vibration direction of the voice coil 30 (first phase) in order to give a Lorentz force in the same direction to the current (voice current) flowing through the voice coil 30. A pair of magnetic fields are formed in opposite directions with respect to the portion 30a and the second portion 30b). Thus, when an audio current flows through the voice coil 30, the voice coil 30 vibrates along the arrangement direction of the magnetic pole portions 20G1 and 20G2 in which a pair of magnetic fields are formed.

The magnetic circuit 20 is formed by a magnet 21 magnetized in the X-axis direction that is the vibration direction of the voice coil 30 and a magnetic body (yoke part) 22 arranged as necessary to form the magnetic pole parts 20G1 and 20G2. Has been. The magnetic circuit 20 is disposed above the magnetic pole portions 20G1 and 20G2 when the magnetic circuit 20 is disposed below the voice coil 30, and below when the magnetic circuit 20 is disposed above the voice coil 30. Magnetic fields in opposite directions along the Z-axis direction are formed. The voice coil 30 is arranged in a magnetic field opposite to each other, and the voice coil 30 is wound so that, for example, the currents flowing through the magnetic fields are opposite to each other in the Y-axis direction. Lorentz force is working. 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 FIG. 4, the magnetic pole member 20A forming the magnetic circuit 20 has a plurality of magnets 21 (21A to 21C), and the magnetic pole member 20A is attached to the stationary part 100 (FIG. 4A). Is a perspective view, and FIG. In the illustrated example, three magnets 21 (21A to 21C) arranged in a uniaxial direction are provided, and the magnetic pole portions 20G1 and 20G2 are provided between the magnets 21 (21A to 21C), but the invention is not particularly limited thereto. The magnets 21 (21A to 21C) are arranged such that one end thereof is an N pole and the other end is an S pole along the X-axis direction, and the same magnetic poles are opposed to each other with the magnetic pole portions 20G1 and 20G2 interposed therebetween. Further, the magnetic pole member 20 A has the magnetic pole portions 20 G 1 and 20 G 2 formed by the yoke portion 22 so as to protrude toward the voice coil 30.

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

linear portions

30A and 30C of the voice coil 30 are a first portion 30a and a second portion 30b that face the magnetic pole portions 20G1 and 20G2 of the magnetic circuit 20 and protrude from one magnetic pole (N pole) of the magnet 21. The magnetic flux G1 passing through the voice coil 30 traverses the first portion 30a, and the magnetic flux G2 entering the other magnetic pole (S pole) through the voice coil 30 traverses the second portion 30b. .

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. The voice coil 30 can have a relatively large portion in a pair of magnetic fields, for example, by relatively increasing the number of turns, and can obtain a relatively large driving force when the speaker is driven.

In the illustrated example, the voice coil 30 is supported by a voice coil support portion 40 made of an insulating flat plate 41 (a flat plate member formed of an insulating member). Although the example which formed the opening part 41b in 41 is shown, rigidity can be provided to the voice coil 30, and the whole can also be formed in plate shape. When the voice coil 30 has rigidity, the voice coil support part 40 may not be used.

The magnetic circuit 20 shown in FIG. 4 is provided with a plurality of magnets 21 (21A to 21C) so as to sandwich the magnetic pole portions 20G1 and 20G2, and the magnet 21 (21A to 21C) has a side surface facing the magnetic pole portions 20G1 and 20G2. It has the same magnetic pole. As a result, the

linear portions

30A and 30C arranged in the vibration direction (X-axis direction) of the voice coil 30 can be arranged in magnetic fields in opposite directions, and the voice coil 30 is vibrated in the X-axis direction by the voice current flowing through the voice coil 30. Can be made.

5 and 6 are explanatory views showing other examples of the configuration of the magnetic circuit for the speaker device according to the embodiment of the present invention (the reference numerals of the respective parts are referred to the description of FIG. 4). In the example shown in FIGS. 5A to 5D, the magnetic pole member 20A is arranged on the stationary part 100, and the flat magnetic body 23 arranged apart from the magnetic pole member 20A is formed by the magnetic pole member 20A and the voice coil. The magnetic path is formed between the end of the magnetic pole member 20 A and the end of the magnetic body 23. By providing such a magnetic body 23, the magnetic resistance in the magnetic path (the magnetic path indicated by the dotted line in the drawing) becomes relatively small, and the magnetic flux coming out of the magnetic pole part 20G1 or entering the magnetic pole part 20G2 is a voice coil. Thus, the first part 30a or the second part 30b of the thirty parts are intensively passed. Thereby, magnetic efficiency can be improved and the magnetic flux which passes the 1st part 30a or the 2nd part 30b of the voice coil 30 can be made comparatively large.

The example shown in FIG. 6A is an example in which the magnetic body 23 is extended so as to straddle both ends of the voice coil 30 in the X-axis direction. According to this, since the assembly of a single member is sufficient, the manufacturing process can be simplified. In the example shown in FIG. 5B, the magnetic body 23 is provided corresponding to each of the magnetic pole portions 20G1 and 20G2 so as to face the first portion 30a and the second portion 30b of the voice coil 30. According to this, the magnetic flux which passes the 1st part 30a of the voice coil 30, and the 2nd part 30b can be increased more efficiently.

In the example shown in FIG. 5C, the magnetic body 23 is a part of the stationary part 100. That is, the stationary part 100 itself is made of a magnetic material, and a part of the stationary part 100 is projected to form the magnetic material 23 facing the magnetic pole member 20A. According to this, the assembly work of the magnetic circuit 20 can be simplified. In the example shown in FIG. 4D, the magnetic body 23 is integrally formed with the stationary part 100. When the stationary part 100 is resin-molded, the magnetic body 23 can be integrated by insert molding. According to this, since the magnetic body 23 is integrated with the stationary part 100 in advance, the assembling work of the magnetic circuit 20 can be simplified.

The example shown in FIG. 6A is an example in which only a pair of magnets 21 (21A, 21B) is provided on the stationary part 100 on one side of the voice coil 30. In the example shown in FIG. The

magnets

21A and 21B are spaced apart so that the same magnetic poles magnetized in the X-axis direction face each other. In order to increase the magnetic efficiency, the magnetic body 23 may be provided with the voice coil 30 sandwiched so as to face the

magnets

21A and 21B as necessary. Also by this, the magnetic flux G1 coming out from one magnetic pole (N pole) of the magnet 21 and passing through the voice coil 30 crosses the first portion 30a and passes through the voice coil 30 to the other magnetic pole (S pole) of the magnet 21. The entering magnetic flux G2 crosses the second portion 30b.

In the example shown in FIG. 6B, a pair of magnets 21 (21A, 21B) arranged along a uniaxial direction is provided for each of the magnetic pole portions 20G1, 20G2. According to this, the magnetic flux generated from the pair of

magnets

21A and 21B can be concentrated on the first portion 30a and the second portion 30b of the voice coil 30. In this case, the magnets 21 A and 21 B are magnetized in an oblique direction as indicated by broken-line arrows, so that the magnetic efficiency can be further increased.

In the example shown in FIG. 6C, a pair of magnets 21 (21A, 21B) arranged along one axial direction is provided in one magnetic pole portion 20G2. Also by this, a pair of magnetic fields in opposite directions can be formed by the magnetic fluxes G1 and G2, and the first portion 30a and the second portion 30b of the voice coil 30 can be arranged in each magnetic field.

[Vibration direction conversion unit; FIGS. 7 to 14]
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. That is, the vibration direction conversion unit 50 has one end connected to the voice coil 30 directly or via another member so that the angle can be changed, and the other end is directly or other member connected to the diaphragm 10 so that the angle can be changed. And is arranged obliquely with respect to each of the vibration direction of the diaphragm 10 and 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. 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. To reach position Z ₁ . 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 reaches 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.

FIGS. 9 and 10 are explanatory views showing examples of forming the vibration direction converting portion 50 (FIG. 9A 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 or bent continuously at both sides straddling. 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 or bendable, the link portion 51 or the connecting portion 53 has a thickness t1 with respect to the thickness t1 of the joint portion 52. By forming the thickness t2 into a thin shape, the integral member has different properties.

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 portion 51 is changed, the thickness of the link portion 51 can be prevented from interfering with the angle change.

In the example shown in FIG. 10, a rigid member is integrated with a refracting continuous member to form a link portion 51 or a connecting portion 53, and the joint portion 52 is a portion including 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.

FIG. 11 is an explanatory diagram showing another example of the vibration direction conversion unit 50. Here, an embodiment of a vibration direction conversion unit 50 used in a speaker device 1A provided with a pair of drive units 14 is shown (FIG. (A) is a perspective view and FIG. (B) is the same figure (a)). The enlarged view of the A section in FIG. The vibration direction changing part 50 is formed by one integrated part, and as described above, the pair of first link parts 51A and the

joint parts

52A and 52B are formed at both ends thereof, and the pair of second links.

Joint portions

52C and 52D are formed at the portion 51B and at both ends thereof. Further, a first connecting portion 53A is formed on one end side of the pair of first link portions 51A via the joint portion 52A, and the joint portions 52B formed on the other end side of the pair of first link portions 51A. A second connection portion 53B is formed, and a stationary connection portion 53C is formed between the joint portions 52D formed on the other end side of the second link portion 51B. The

first link portions

51A and 51A and the second connection portion 53B are refracted in a convex shape, and the

second link portions

51B and 51B and the stationary connection portion 53C are refracted in a concave shape.

As shown in FIG. 11B, the joint portion 52A is formed to be refracted by the above-described continuous member 50P, and the above-described rigid member 50Q is attached to the first link portion 51A, so that the first connecting portion. The above-described rigid member 50Q is also attached to 53A. And all the joint parts mentioned above are formed in the same composition. In addition,

inclined surfaces

51t and 53t are formed facing each other at each joint.

12, 13, and 14 are explanatory diagrams illustrating another example of the vibration direction conversion unit 50 according to the embodiment of the present invention (FIG. 12A is a side view, FIG. 12B is a perspective view, FIG. 13 is an explanatory diagram of operation, and FIGS. 14A and 14B are explanatory diagrams of modified examples. This vibration direction conversion part 50 (link mechanism 50L) is a case where a pair of drive parts are provided and the vibration direction conversion parts 50 are arranged opposite to each other substantially symmetrically, and a parallel link is formed by a plurality of link portions. Yes.

The vibration direction conversion unit 50 according to this embodiment has one end as a joint portion 52A (R) and 52A (L) with the first connection portions 53A (R) and 53A (L), and the other end as a second connection. A pair of first link portions 51A (R) and 51A (L) are provided as joint portions 52B (R) and 52B (L) with the portion 53B. Also, one end is a joint part 52C (R), 52C (L) with an intermediate part of the first link parts 51A (R), 51A (L), and the other end is a joint part 52D ( R) and 52D (L) have a pair of second link portions 51B (R) and 51B (L). As described above, the first connecting portion 53A is connected to the voice coil support portion 40 directly or via the connecting portion 60, the second connecting portion 53B is connected to the diaphragm 10, and the stationary connecting portion 53C is stationary. It is connected to the bottom 12A of the frame 12 to be a part, the yoke part 22 forming the magnetic circuit 20, and the like.

Furthermore, joints 52E (R), (L) with a pair of connection portions 53D (R), 53D (L) whose one ends are integrally extended from the first connection portions 53A (R), 53A (L). And the other end has third link portions 51C (R) and (L) which are joint portions 52F (R) and 52F (L) with the second connecting portion 53B and the connecting portion 53E integrated. .

The first link portion 51A (R), the third link portion 51C (R), the first link portion 51A (L), the third link portion 51C (L), and the second link portion 51B (R ) And the third link portion 51C (L), and the second link portion 51B (L) and the third link portion 51C (R) form a parallel link.

The link mechanism 50L of the vibration direction conversion unit 50 has a function of combining the link mechanism and the parallel link mechanism of the embodiment shown in FIG. The rigid members 50Q are integrally formed with each other, and the joint portions between the link portions are formed in a linear shape by only the refracting continuous member 50P, and the link portions are integrally formed via the joint portions. ing.

The operation of this vibration direction converter 50 will be described with reference to FIG. In this example, the immovable connecting portion 53C supported by the frame 12 functions as a stationary portion. According to such a vibration direction conversion unit 50, when the joints 52A (R) and (L) move from the reference position X0 in the X-axis direction to X1 due to the vibration of the voice coil support unit 40, the second is performed by the parallel link mechanism. The first link portions 51A (R), (L) and the third link portions 51C (R) forming the parallel links are raised while maintaining the parallel connection portion 53B and the connection portion 53E integrated therewith in a parallel state. ), (L) is changed so that the angle rises. At this time, since the joint portions 52D (L) and (R) are supported at both ends of the stationary connection portion 53C that becomes the stationary portion, the first link portion 51A (R) receives the reaction force from the stationary portion. , (L) and the third link portions 51C (R), (L) are reliably changed, and the displacement of the joint portions 52A (R), (L) from the position X0 to the position X1 is determined by the diaphragm 10 Is reliably converted into a displacement from the position Z0 to the position Z1.

Similarly, when the joint portions 52A (R) and (L) move from the reference position X0 in the X-axis direction to X2, the second link portion 53B and the link portion 53E integrated therewith are maintained in a parallel state by the parallel link mechanism. The angle is changed so that the first link portions 51A (R), (L) and the third link portions 51C (R), (L) forming the parallel links fall down. At that time, since the joint portions 52D (R) and (L) are supported by the stationary portion, the first link portions 51A (R) and (L) and the third link receive the reaction force from the stationary portion. The angle of the portions 51C (R) and (L) is reliably changed, and the displacement of the joint portions 52A (R) and (L) from the position X0 to the position X2 is changed from the position Z0 to the position Z2 of the diaphragm 10. Surely convert to

According to such an embodiment, the joint portions 52B (R), (L), 52F (R), (L) in which the vibration in the X-axis direction of one voice coil support portion 40 vibrates with substantially the same phase and substantially the same amplitude. ) And the vibration in the Z-axis direction in the second connecting portion 53B. As a result, the diaphragm 10 is supported in a wide range and is provided with vibrations having substantially the same phase and substantially the same amplitude. Therefore, the vibration of the voice coil support unit 40 with respect to the planar diaphragm 10 having a large area is provided. Can be transmitted in substantially the same phase.

As shown in FIG. 12 (b), the vibration direction converter 50 has the connecting

portions

53B, 53D (R), (L), and the third link portions 51C (R), (L) parallel to a pair in the width direction. The first link portions 51A (R) and (L) are formed in a bifurcated manner, and the joint portions 52C (R) and the second link portions 51B (R) and (L) are formed in the middle portion thereof. (L) is formed, and the second link portions 51B (R), (L) and the connecting portion 53C are connected in parallel in a pair in the

width direction

53B, 53D (R), (L), third. Between the link portions 51C (R) and (L).

By forming the link portion with a single sheet-like (plate-like) component in this way, the diaphragm 10 can be supported and vibrated on the surface, so that the entire diaphragm 10 can be vibrated substantially in phase. It is possible to suppress divided vibration.

Also, as shown in FIG. 12 (b), the vibration direction converter 50 of this embodiment refracts the entire plate-shaped member forming the link portion into a convex trapezoidal shape so that the first link portion 51A (R ), (L) and the second connecting portion 53B are formed, and the plate-like member is partially cut out and refracted into a concave shape to be fixedly connected to the second link portions 51B (R), (L). A portion 53C is formed.

In such an embodiment, since the link mechanism of the vibration direction changing unit can be formed only by mounting one integral part to the two opposing voice coils 30, a speaker device including a pair of drive units is provided. Even in the case of forming, assembly work can be easily performed. Further, by providing the immovable connecting portion 53C, the joint portions 52D (R), (particularly with respect to the opposing vibration of the voice coil 30 (the plurality of voice coils 30 vibrate in opposite directions). Even if L) is not supported by the frame 12, the positions of the joints 52D (R) and (L) are held constant, and this also facilitates the incorporation of the vibration direction converter into the speaker device. Can be

In the embodiment shown in FIGS. 12 and 13, as the link mechanism, the right first link portion 51A (R), the third link portion 51C (R), and the left first link portion 51A (L ) And the third link portion 51C (L) form a parallel link, so that the second connecting portion 53B fixed to the diaphragm 10 with respect to the opposing vibration of the voice coil support portion 40 is placed in the Z-axis direction. It is possible to stably translate along. As a result, it is possible to apply stable vibration to the planar diaphragm 10.

The embodiment shown in FIG. 14 is an improved example of the embodiment shown in FIG. In the example shown in FIG. 5A, the convex portion 510 is provided on the link portion where bending is likely to occur due to the opposing vibration of the voice coil support portion 40 to increase the rigidity. In the illustrated example, the first link portions 51A (R), (L), the second link portions 51B (R), (L), the connecting portions 53D (R), (L), and the connecting portions 53C are convex. A portion 510 is provided. Further, in the example shown in FIG. 5B, an opening 520 is provided in a link portion that does not particularly require strength, thereby reducing the weight of the vibration direction changing portion. In the illustrated example, an opening 520 is provided in the connecting portion 53B. The weight reduction of the vibration direction converter is particularly effective in widening the reproduction characteristics and increasing the amplitude and sound pressure level of the sound wave for a predetermined audio current.

[Holding part (damper); FIG. 15]
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 part 15 can be deformed along the vibration direction of the voice coil 30 and can be formed of a curved plate member having rigidity in a direction intersecting the vibration direction.

FIG. 15 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 an end portion of the voice coil 30 or a lead wire 43 from the end portion 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). . Moreover, you may form the holding | maintenance part 15 with insulating members, such as resin. 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 connecting

portions

15X and 15Y are made of an insulator such as resin, and the lead wire 43 drawn from the voice coil 30 is electrically connected to the holding portion 15 using solder or the like. It 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 lead wire 43 drawn from the end portion, and the connection portion 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, as shown in the example of FIG. 15, the lead wire 43 is formed on the voice coil support portion 40, so that it is not necessary to provide a predetermined space for routing the lead wire 43, and the speaker device can be thinned. Is possible.

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. In addition, since the lead wire 43 extends to the conductive holding portion 15 and is electrically connected, the lead wire 43 and the holding portion 15 can be prevented from being disconnected, and the reliability of the speaker device is improved. Can do.

The holding part 51 made of a conductive metal of a curved plate-like member allows the movement of the voice coil support part 6 in the direction along the X axis by deformation of the holding part 15, and the curved plate shape in the direction along the Z axis. Movement is restricted by the high rigidity of the member. Therefore, the voice coil support portion 40 is held 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; FIGS. 16 to 18]
16 to 18 are explanatory views showing examples of speaker devices incorporating the above-described configuration of the magnetic circuit for the speaker device. The reference numerals in each figure are referred to the above description. Each figure shows a left sectional view of the axis of symmetry O. The speaker device 1 (1B to 1J) shown in FIGS. 16 to 18 includes, as the vibration direction converter 50, a first link portion 51 (51A) having joint portions 52 at both ends, and a second link portion 51 ( 51B), a link mechanism provided in the third link portion 51 (51C) is configured, and the first link portion 51 (51A) and the third link portion 51 (51C) form a parallel link. By constituting a link mechanism with the first link portion 51 (51A) and the third link portion 51 (51C) arranged at a predetermined interval, the diaphragm 10 can be vibrated integrally. Therefore, it is possible to radiate high-quality reproduced sound in which the divided vibration of the diaphragm 10 is suppressed. Further, the vibration of the voice coil 30 that vibrates in one axial direction can be transmitted to the diaphragm 10 without arranging a link portion on the magnetic circuit 20 side of the voice coil 30. Moreover, the space on the magnetic circuit 20 side of the voice coil 30 can be narrowed, and the speaker device 1 can be thinned.

The speaker device 1 (1B: FIG. 16A) includes the magnetic circuit 20 or the magnetic pole member 20A shown in FIG. The speaker device 1 (1C: FIG. 16B) includes the magnetic circuit 20 or the magnetic pole member 20A shown in FIG. 4, and the mounting height of the magnetic circuit 20 on the frame 12 and the mounting height of the diaphragm 10 are substantially matched. This is an example. By reducing the length of the link portion 51, the thickness can be further reduced. The speaker device 1 (1D: FIG. 16C) includes the magnetic circuit 20 or the magnetic pole member 20A shown in FIG. The speaker device 1 (1E: FIG. 16 (d)) includes the magnetic circuit 20 or the magnetic pole member 20A shown in FIG. 5 (b). The speaker device 1 (1F: FIG. 17A) includes the magnetic circuit 20 or the magnetic pole member 20A shown in FIG. The speaker device 1 (1G: FIG. 17B) includes the magnetic circuit 20 or the magnetic pole member 20A shown in FIG. 6B, and further attaches the magnetic body 23 to the stationary portion 100 on the opposite side across the voice coil 30. I have. The speaker device 1 (1H: FIG. 18A) is configured such that the magnetic circuit 20 or the magnetic pole member 20A shown in FIG. All the magnetic circuits for the speaker device according to the embodiment of the present invention may be provided on the upper side or the lower side with respect to the voice coil 30. The speaker device 1 (1I: FIG. 18B) is an example in which the magnetic circuit 20 or the magnetic pole member 20A shown in FIG. The speaker device 1 (1J: FIG. 18C) is an example including the magnetic circuit 20 or the magnetic pole member 20 shown in FIG.

[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.

In addition, 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. It is possible to radiate high-quality reproduced sound with a relatively simple structure.

Since the back surface of the diaphragm 10 can be supported by a plurality of driving units 14 at different positions, the diaphragm 10 can be vibrated integrally even if the diaphragm 10 has a large area. High-quality reproduced sound with suppressed divided vibration can be radiated. 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 achieving reduction in thickness of the speaker device, and the minimum resonance frequency is further reduced. The playback band can be expanded. In addition, since the diaphragm 10 can be supported in a plurality of locations and can be vibrated in parallel, the entire surface can be vibrated substantially in phase even with a relatively large diaphragm.

Since the magnetic circuit 20 is configured by arranging a magnetic pole member on one side of the space partitioned by the planar voice coil 30, the magnetic coil 30 is vibrated in a uniaxial direction along the plane of the voice coil 30, and the vibration is In the speaker device that changes the direction and transmits the vibration to the diaphragm 10 that vibrates in the direction intersecting with the vibration of the voice coil 30, the magnetic circuit 20 is not bulky in the vibration direction of the diaphragm 10, and an extremely thin speaker device can be obtained. .

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. 19 is an explanatory diagram 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. 20 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

The planar voice coil and the voice coil vibrate in a uniaxial direction along the plane on which the voice coil is formed, and the direction-converted vibration of the voice coil is transmitted in a direction crossing the uniaxial direction. A magnetic circuit used in a speaker device comprising a vibrating diaphragm,
A magnetic pole member is arranged on one side of the space partitioned by the voice coil,
The magnetic circuit for a speaker device, wherein the magnetic pole member includes a magnet magnetized in the uniaxial direction.
Magnetic flux exiting one magnetic pole of the magnet and passing through the voice coil crosses a first portion where the voice coil intersects the uniaxial direction, and magnetic flux entering the other magnetic pole of the magnet through the voice coil is The magnetic circuit for a speaker device according to claim 1, wherein the magnetic circuit crosses a second portion of the voice coil that intersects the uniaxial direction.
The magnetic pole member includes a magnetic pole part,
3. The magnetic circuit for a speaker device according to claim 2, wherein the plurality of magnets are arranged so that the same magnetic poles face each other with the magnetic pole portion interposed therebetween.
4. A magnetic circuit for a speaker device according to claim 3, wherein a pair of the magnetic pole portions are provided, and each magnetic pole portion faces the first portion and the second portion of the voice coil.
5. The magnetic circuit for a speaker device according to claim 4, wherein the magnetic pole member has a magnetic pole portion convex toward the voice coil.
The magnetic pole member includes at least three magnets arranged along the uniaxial direction,
The magnetic circuit for a speaker device according to claim 4, wherein the magnetic pole portion is provided between the magnets.
The magnetic circuit for a speaker device according to claim 4, wherein the magnetic pole member includes a pair of the magnets arranged along the uniaxial direction for each magnetic pole portion.
The magnetic circuit for a speaker device according to claim 1, wherein the magnet is magnetized in an oblique direction with respect to the uniaxial direction.
A flat plate-like magnetic body that is not magnetically coupled to the magnetic pole member is disposed facing the magnetic pole member and the voice coil,
The magnetic circuit for a speaker device according to claim 4, wherein a magnetic path is formed between an end portion of the magnetic pole member and an end portion of the magnetic body.
10. The magnetic circuit for a speaker device according to claim 9, wherein the magnetic body is supported by a stationary portion that supports the diaphragm and the voice coil so as to freely vibrate.
10. The magnetic circuit for a speaker device according to claim 9, wherein the magnetic body is a part of a stationary portion that supports the diaphragm and the voice coil so as to freely vibrate.
10. The magnetic circuit for a speaker device according to claim 9, wherein the magnetic body is formed integrally with a stationary portion that supports the diaphragm and the voice coil so as to freely vibrate.
The magnetic circuit for a speaker device according to claim 9, wherein the magnetic body is provided corresponding to each of the magnetic pole portions.
A stationary part, and a vibrating part supported by the stationary part so as to freely vibrate,
The stationary part includes a magnetic circuit;
The vibrating part is
A voice coil formed in a planar shape, and the voice coil is supported so as to freely vibrate in one axial direction along a plane on which the voice coil is formed,
A diaphragm supported so as to freely vibrate in a direction intersecting the 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 magnetic circuit is:
A magnetic pole member is arranged on one side of the space partitioned by the voice coil,
The speaker device, wherein the magnetic pole member includes a magnet magnetized in the uniaxial direction.
A magnetic flux emitted from one magnetic pole of the magnet crosses a first portion where the uniaxial direction of the voice coil intersects, and a magnetic flux entering the other magnetic pole of the magnet intersects the uniaxial direction of the voice coil. The speaker device according to claim 14, wherein the speaker device crosses the portion.
The stationary part is arranged above and below the voice coil, the magnetic circuit is arranged on the stationary part above the voice coil, and the distance from the voice coil to the stationary part above the voice coil is from the voice coil. The speaker device according to claim 15, wherein the speaker device is larger than a distance to a lower stationary portion of the voice coil.
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 connected to the diaphragm directly or via another member so that the angle can be changed. Connected,
The speaker device according to claim 16, wherein the speaker device is disposed obliquely with respect to each of a vibration direction of the diaphragm and a moving direction of the voice coil.
18. The vibration direction conversion section 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 diaphragm side and the voice coil side. The speaker device according to 1.
The speaker device according to claim 18, wherein the vibration direction conversion unit includes a link mechanism that converts an angle of the link portion.
The speaker device according to claim 19, wherein the link mechanism performs angle conversion in response to a reaction force from the stationary portion where the link portion is located on the opposite side to the diaphragm side.
The speaker device according to claim 20, wherein the stationary portion is a part of a frame.
The frame has a flat bottom surface, the diaphragm is supported to face the bottom surface of the frame, and the vibration direction changing portion vibrates in the direction intersecting the bottom surface by a reaction force from the bottom surface of the frame. The speaker device according to claim 21, wherein the speaker is vibrated.
The speaker device according to claim 14, wherein an outer peripheral portion of the diaphragm is supported by the frame via an edge.
15. The speaker device according to claim 14, wherein the magnetic circuit includes at least the magnet and a yoke portion, and the stationary portion is formed by the yoke portion.
25. The speaker device according to claim 24, wherein the voice coil has a pair of linear portions intersecting with the uniaxial direction.
26. The speaker device according to claim 25, wherein each of the first portion and the second portion of the voice coil includes the straight portion.
15. The speaker device according to claim 14, 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.
28. The speaker device according to claim 27, wherein the holding portion is formed of a curved plate member that is deformable along a vibration direction of the voice coil and has rigidity in a direction intersecting the vibration direction. .
15. The speaker device according to claim 14, wherein the vibration direction converter is formed by a plate-like member having a linear refracting part, and the refracting part is the joint part.
30. The speaker device according to claim 29, 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 14, wherein the first link portion and the second link portion are 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 14, wherein the speaker device is on a circumference having a diameter substantially equal to a length of the first link portion centering on the third joint portion.
The vibration direction conversion unit includes a plurality of link portions obliquely arranged with respect to the vibration direction of the voice coil,
Both ends of the one link part are connected to the end of the voice coil and the diaphragm directly or via other members,
18. The speaker device according to claim 17, wherein both ends of the other link portion are connected to a part of the voice coil and the diaphragm between the both ends directly or via other members.
The vibration direction conversion unit includes a plurality of link portions obliquely arranged with respect to the vibration direction of the voice coil,
The speaker device according to claim 17, wherein the plurality of link portions are arranged inside a position where the magnetic circuit is arranged at a predetermined interval.
An automobile comprising the speaker device according to claim 14.
An electronic apparatus comprising the speaker device according to claim 14.
A building comprising the speaker device according to claim 14.