JP2012080577A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve both of thinning and large volume of a speaker device.SOLUTION: A speaker device includes a diaphragm 2, a frame 3, and a drive part 4. The drive part 4 includes a magnetic circuit 40 having a magnetic gap 40G in the direction different from the vibration direction of the diaphragm 2, a voice coil that vibrates along the magnetic gap 40G, and a vibration direction converter 7 that performs direction conversion of the vibration of the voice coil to transmit it to the diaphragm 2. The vibration direction converter 7 includes a first link part 70 whose one end is connected to the diaphragm 2 and the other end is connected to the voice coil via a joint part 70A, and a second link part 71 whose one end is connected to the intermediate part of the first link part 70 and the other end is connected to a stationary part 34 oppositely positioned to the diaphragm 2 via a joint part 71B. The joint part 70A connecting the first link part and the voice coil extends almost parallel with the joint part 71B connecting the second link part 71 and stationary part 34.

Description

  The present invention relates to a speaker device.

  A dynamic speaker device is known as a general speaker device (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.

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

  This invention makes it an example of a subject to cope 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, In particular, it is possible to obtain a speaker device suitable for reproduction in a high sound range, to provide a thin speaker device capable of emitting high-quality reproduction sound with a relatively simple structure, and to provide a diaphragm with a relatively simple configuration. It is an object of the present invention to provide a thin speaker device that vibrates in substantially the same phase.

In order to achieve such an object, the speaker device according to the present invention comprises at least the configurations according to the following independent claims.
A diaphragm, a frame, and a drive unit, wherein the drive unit includes a magnetic circuit having a magnetic gap in a direction different from a vibration direction of the diaphragm, a boil coil that vibrates along the magnetic gap, and the voice coil A vibration direction converter that changes the direction of vibration and transmits the vibration to the diaphragm, and one end of the vibration direction converter is connected to the diaphragm and the other end is connected to the voice coil via a joint. A first link portion having a first end connected to an intermediate portion of the first link portion and a second end connected to a stationary portion located on the opposite side of the diaphragm via a joint portion. A joint portion that connects the first link portion and the voice coil extends substantially parallel to the joint portion that connects the second link portion and the stationary portion. Speaker device.

It is explanatory drawing of a prior art. It is explanatory drawing which showed the basic composition of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the basic composition (drive part) of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the basic composition (drive part) of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the basic composition (drive part) of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the basic composition (operation | movement of a vibration direction conversion part) of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing of the speaker apparatus which concerns on embodiment other than this invention. It is explanatory drawing of the speaker apparatus which concerns on embodiment other than this invention. It is explanatory drawing which shows a part (vibration direction conversion part) of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows a part (link mechanism of a vibration direction conversion part) of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows a part (link mechanism of a vibration direction conversion part) of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing (perspective view) explaining the Example of this invention. It is explanatory drawing (sectional perspective view) explaining the Example of this invention. It is explanatory drawing (top perspective view) explaining the Example of this invention. It is explanatory drawing (top view) explaining the Example of this invention. It is explanatory drawing (perspective view) explaining the other Example 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 apparatus which concerns on embodiment of this invention.

  A speaker device according to an embodiment of the present invention includes a diaphragm, a frame that supports the diaphragm so as to freely vibrate along a vibration direction, and a drive unit that is provided on the frame and that vibrates the diaphragm with an audio signal. The drive unit includes a magnetic circuit that forms a magnetic gap along a direction different from the vibration direction of the diaphragm, a voice coil support unit that has a voice coil and vibrates along the magnetic gap, and A vibration direction conversion unit that changes the direction of vibration of the voice coil support unit and transmits the vibration to the diaphragm, and the vibration direction conversion unit is a link portion formed between the voice coil support unit and the diaphragm. It is characterized by comprising a link mechanism for converting the angle of the.

  In addition, the link mechanism is characterized in that the link portion receives a reaction force from a stationary part located on the opposite side to the diaphragm side, and converts the angle, more specifically, the stationary part It is a part of the frame.

  The frame has a flat bottom surface, the diaphragm is supported in a plane along the bottom surface of the frame, the magnetic gap is formed along the bottom surface of the frame, The diaphragm is vibrated in a direction crossing the bottom surface by a reaction force from the bottom surface of the frame.

  Further, the magnetic circuit has a pair of magnetic gaps in which magnetic fields in opposite directions are formed, and the voice coil support portion is formed in a planar shape, and current flows in different directions through the pair of magnetic gaps. Thus, it has a voice coil formed in an annular shape.

  In the speaker device having such a feature, when an audio signal is input to the voice coil of the driving unit, a Lorentz force is generated in the voice coil arranged in the magnetic gap of the magnetic circuit, and the voice coil support unit is It vibrates along a direction different from the vibration direction, preferably along a direction orthogonal to the vibration direction of the diaphragm. On the other hand, the vibration direction conversion unit functions to change the direction of the vibration of the voice coil support unit and transmit it to the diaphragm. The diaphragm vibrates along a vibration direction different from the voice coil support part (for example, orthogonal to the voice coil support part) by the driving force transmitted through the vibration direction conversion part.

  In a general speaker device, for example, a voice coil bobbin is disposed on the back side of the diaphragm, and the vibration direction of the diaphragm and the vibration direction of the voice coil bobbin are configured in the same direction. Since the diaphragm and the voice coil bobbin require a region for vibration, the width (overall height) along the acoustic radiation direction of the speaker device is relatively large.

  On the other hand, in the speaker device according to the embodiment of the present invention, a magnetic circuit having a magnetic gap formed in a direction different from the vibration direction of the diaphragm, preferably in a direction orthogonal to the vibration direction of the diaphragm, and Since it has a voice coil support part that vibrates along the magnetic circuit, and further has a vibration direction conversion part that changes the direction of vibration of the voice coil support part and transmits it to the diaphragm, compared with the general speaker device described above, The width along the acoustic radiation direction is relatively small. That is, a thin speaker device can be provided. In addition, since the vibration stroke of the voice coil support part can be set in a direction that does not affect the overall height of the speaker device, the speaker device can be thinned even when the vibration stroke of the voice coil support part, that is, the amplitude of the diaphragm is increased. It's easy to do. This makes it possible to achieve both a reduction in the thickness of the speaker device and an increase in volume.

  In addition, since the vibration direction conversion part is formed by a link mechanism that changes the angle of the link part formed between the voice coil support part and the diaphragm, the vibration of the voice coil support part is vibrated reliably and mechanically. You can tell the board. The link mechanism is configured so that the angle is changed by receiving a reaction force from the stationary part where the link part is located on the opposite side of the diaphragm side, so that the vibration of the voice coil support part is counteracted by the stationary part. Therefore, even if the vibration direction of the voice coil and the vibration direction of the diaphragm are different, good vibration transmission efficiency can be obtained. Good reproduction efficiency can be obtained. In particular, it is possible to obtain good reproduction characteristics in the high sound range by reliably transmitting the vibration of the voice coil to the diaphragm.

  Further, in the speaker device according to the embodiment of the present invention, the driving force generated in the voice coil is mechanically converted into an angle through a vibration direction converter having a link mechanism and transmitted to the diaphragm. The principle itself is the same as a dynamic speaker. Therefore, it is possible to radiate a relatively high-quality reproduced sound when a large volume is generated as compared with the capacitor type speaker described above.

  In addition, for example, there is a speaker device that transmits the driving force using the bending of the flexible member when transmitting the driving force from the voice coil to the diaphragm. In particular, there is a problem that a low frequency is likely to occur. Compared with the speaker device that transmits the driving force using the bending of the flexible member, the speaker device according to the embodiment of the present invention transmits the driving force from the voice coil to the diaphragm by the rigid link mechanism. Therefore, for example, there is no decrease in response due to distortion of the flexible member, and the diaphragm can be vibrated with relatively high sensitivity.

  Further, as a specific arrangement configuration, the frame has a flat bottom surface, the diaphragm is planarly supported along the bottom surface of the frame, the magnetic gap is formed along the bottom surface of the frame, and the vibration direction change Since the vibration part vibrates the diaphragm in a direction intersecting with the bottom surface by the reaction force from the bottom surface of the frame that becomes the stationary part described above, the entire speaker device can be planarly formed along the bottom surface of the frame. Therefore, the overall apparatus can be thinned.

  Further, as a specific structure of the drive unit, the magnetic circuit has a pair of magnetic gaps in which magnetic fields in opposite directions are formed, and the voice coil support unit is formed in a planar shape, and the pair of magnetic gaps Since the voice coil is formed in an annular shape so that current flows in different directions, the planar voice coil support can be planarly vibrated with a high driving force using a pair of magnetic gaps. By increasing the planar rigidity of the coil support portion, linear vibration without fluctuations becomes possible. In particular, in the case of having the above-described planar frame bottom surface, a thin space on the frame bottom surface can be used as a vibration space of the voice coil support portion, and the space efficiency in the thickness direction can be improved.

  The speaker device according to the present invention can be employed in various devices such as a mobile phone, a vehicle-mounted speaker, a personal computer speaker, and a television broadcast receiver speaker.

  Hereinafter, a speaker device according to an embodiment of the present invention will be described with reference to the drawings.

  2-6 is explanatory drawing which showed the basic composition of the speaker apparatus based on embodiment of this invention. 2A is a plan view (the diaphragm is shown in phantom lines and shows a state where the diaphragm is removed), and FIG. 2B is a cross-sectional view taken along the line AA in FIG. 3 to 5 are explanatory views showing the drive unit (FIG. 3 is an assembled perspective view, FIG. 4 is an exploded perspective view, and FIG. 5 is a sectional view), and FIG. 6 shows the operation of the vibration direction changing unit. It is explanatory drawing. In the following description, the acoustic radiation direction (SD) is defined as the Z-axis direction, the longitudinal direction of the speaker device is the X-axis direction orthogonal to the Z-axis direction, and the direction orthogonal to the Z-axis direction and the X-axis direction is the Y-axis. The direction is specified.

  The speaker device 1 according to the embodiment of the present invention includes a diaphragm 2, a frame 3, and a drive unit 4 as main components. The outer edge of the diaphragm 2 is supported by the outer peripheral edge 3 </ b> A of the frame 3 through the edge 5. The vibration direction of the diaphragm 2 is basically restricted only in the Z-axis direction by the function of the edge 5. When the audio signal is applied to the drive unit 4, the drive unit 4 is driven, and vibration generated by the drive is given to the diaphragm 2.

  The drive unit 4 includes a magnetic circuit 40, a voice coil support unit 6, and a vibration direction conversion unit 7. The magnetic circuit 40 forms a magnetic gap 40G along a direction (for example, the X-axis direction) different from the vibration direction (for example, the Z-axis direction) of the diaphragm 2. In the example shown in the figure, the magnetic gap 40G is formed along the direction orthogonal to the vibration direction of the diaphragm 2. However, the present invention is not particularly limited thereto. The voice coil support 6 has a voice coil 60 and vibrates along the magnetic gap 40G. The movement is restricted by the damper 8 and movement only in the direction along the magnetic gap 40G is allowed. When an audio signal is input to the voice coil 60, Lorentz force acts on the voice coil 60 in the magnetic gap 40G. Thus, the voice coil support 6 integrated with the voice coil 60 vibrates.

  The vibration direction conversion unit 7 changes the direction of the vibration of the voice coil support unit 6 and transmits it to the diaphragm 2. The vibration direction conversion unit 7 includes a link mechanism as will be described later, and converts the angle of a link portion (first link portion) 70 formed between the voice coil support portion 6 and the diaphragm 2. Therefore, the direction of the vibration of the voice coil support 6 is changed and transmitted to the diaphragm.

  According to such an embodiment of the present invention, for example, an audio signal is sent from the audio signal generation source 50 to the terminal 52 provided in the frame 3 via the signal line 51, and further from the terminal 52 to the voice coil via the signal line 53. When an audio signal is input to the voice coil 60 of the support unit 6, the voice coil support unit 6 vibrates along a magnetic gap 40 </ b> G formed along a direction different from the allowable vibration direction of the diaphragm 2. Thus, the vibration is changed in direction by the vibration direction converter 7 and transmitted to the diaphragm 2, and the diaphragm 2 is vibrated to emit a sound corresponding to the sound signal in the acoustic radiation direction SD. .

  At this time, since the direction of the magnetic gap 40G intersects the vibration direction of the diaphragm 2 and the thickness direction of the speaker device 1, the driving force of the magnetic circuit 40 or the vibration stroke of the voice coil support 6 can be increased. It does not directly affect the size of the speaker device 1 in the thickness direction (Z-axis direction). Therefore, it is possible to reduce the thickness of the speaker device 1 while increasing the volume. Further, structurally, it is possible to make the thickness of the speaker device 1 thinner than the vibration stroke (displacement) of the voice coil support portion 6, so that the thickness can be easily reduced.

  Moreover, since the vibration direction conversion part 7 converts the vibration direction of the voice coil support part 6 by the mechanical link mechanism and transmits it to the diaphragm 2, the vibration transmission efficiency is high. Furthermore, since the angle conversion of the link portion 70 is performed in response to the reaction force from the frame 3 that is a stationary portion with respect to the vibration of the voice coil support portion 6, the vibration from the voice coil support portion 6 can be more reliably performed. Can be transmitted to the diaphragm. As a result, it is possible to obtain good reproduction efficiency of the speaker device 1, and in particular, it is possible to obtain good reproduction characteristics in the high sound range by reliably transmitting the vibration of the voice coil 60 to the diaphragm.

  Hereinafter, each component of the speaker device 1 according to the present embodiment will be described in detail.

[Frame 3] The frame 3 supports the vibration plate 2 so as to vibrate freely along the vibration direction and also supports the drive unit 4 therein. In addition, the frame 3 supports a part of the link mechanism of the vibration direction conversion unit 7 and applies a reaction force from the frame 3 to the operation of the link mechanism. Such a frame 3 desirably has a planar bottom surface 31A.
The frame 3 is also a stationary part that is disposed in a state of being stationary with respect to the voice coil support part 6. The stationary portion is not intended to be completely stationary. For example, the stationary portion may be stationary so that the diaphragm 2 can be supported, and vibration generated when the speaker device 1 is driven propagates. Vibrations may occur throughout the stationary part. In addition to the frame 3, the stationary part here corresponds to a part of the magnetic circuit 40, a place where the speaker device 1 is attached, and the like.

  Further, the stationary part only needs to be mechanically integrated with the magnetic circuit 40 to be described later, and it can be said that the frame 3 is supported by the magnetic circuit 40. In this respect, the frame 3 becomes the stationary part. . Furthermore, members constituting the magnetic circuit 40 and other members supported by the magnetic circuit 40 can also be stationary parts.

  When viewed from the sound radiation direction (SD), the frame 3 shown in FIG. 2 has a planar shape formed in a rectangular shape and a cross-sectional shape formed in a concave shape. As shown in the drawing, the frame 3 includes a bottom plate portion 31 having a rectangular planar shape, and a rectangular tubular portion standing from the outer periphery of the bottom plate portion 31 toward the acoustic radiation direction (SD). 32, and an opening 30 is formed in the upper part. The magnetic circuit 40 is disposed on the bottom plate portion 31, the outer peripheral portion of the edge 5 is joined to the upper end portion of the cylindrical portion 32 with an adhesive or the like, and the opening portion 30 is supported via the edge 5. A diaphragm 2 is disposed. In the illustrated example, a flat outer peripheral edge 3A extending inward is formed at the upper end of the cylindrical portion 32, and an edge 5 is joined to the outer peripheral edge 3A. As a material for forming the frame 3, for example, a known material such as resin or metal can be used. Further, in the illustrated example, the frame 3 is formed by a member different from the magnetic circuit 40, but the lower end flat portion 41A of the yoke 41 constituting the magnetic circuit described later is further enlarged so that the frame 3 The cylindrical portion 32 may be provided and the edge 5 may be supported, and the upper flat portion 41B may be further enlarged instead of the lower flat portion 41A.

  Moreover, as shown in FIG.2 (b), the hole 3 is formed in the flame | frame 3 at the side part and bottom face part, for example. The hole 33 functions as a vent hole, for example. For example, when the vent hole is not provided, when the speaker is driven, the air in the space surrounded by the diaphragm 2 and the frame 3 becomes springy with the vibration of the diaphragm 2, and the vibration of the diaphragm 2 may be reduced. is there. On the other hand, in the illustrated example, since the hole 33 is provided, such vibration reduction of the diaphragm 2 can be suppressed. The hole 33 functions to radiate heat from the magnetic circuit 40 and the voice coil 60. The hole 33 is a signal line that electrically connects the voice coil 60 and an audio signal generation source 50 such as an amplifier, equalizer, tuner, broadcast receiver, and television provided outside the speaker device, for example. It may be used as a hole through.

  [Vibration plate 2] As shown in FIG. 2B, the vibration plate 2 is supported by the frame 3 so as to vibrate along the vibration direction (Z-axis direction). The diaphragm 2 emits sound waves in the acoustic radiation direction (SD) when the speaker is driven. The diaphragm 2 is supported by the frame 3 via the edge 5, and movement along the direction other than the vibration direction, specifically, along the X-axis direction and the Y-axis direction is restricted by the edge 5. The edge 5 and the diaphragm 2 may be integrally formed.

  As a material for forming the diaphragm 2, for example, a resin material, a metal material, a paper material, a ceramic material, a composite material, or the like can be employed. The diaphragm 2 preferably has rigidity, for example. The diaphragm 2 can be formed in a defined shape such as a flat plate shape, a dome shape, or a cone shape. In the illustrated example, the diaphragm 2 is formed in a flat plate shape, and is supported along the planar bottom surface 31 </ b> A of the frame 3. As an embodiment of the present invention that aims to achieve a reduction in thickness, a flat diaphragm 2 is particularly preferable. Moreover, the diaphragm 2 can be formed in a specified shape such as a rectangular shape, an elliptical shape, a circular shape, or a polygonal shape (planar shape) viewed from the acoustic radiation direction (SD). In the example shown in the drawing, the diaphragm 2 has a rectangular planar shape.

  Moreover, you may form a projection part in the surface (surface on the acoustic radiation side) or back surface (surface on the opposite side to the acoustic radiation side) of the diaphragm 2 as needed. The protrusion has a function of increasing the rigidity of the diaphragm 2. The protrusions may be formed in a linear shape, an annular shape, or a lattice shape with respect to the surface of the diaphragm 2. For example, a plurality of linear protrusions may be formed on the surface of the diaphragm.

  The diaphragm 2 is supported by the frame 3 so as to freely vibrate, and a space surrounded by the diaphragm 2 and the frame 3 on the back side of the diaphragm 2 (the side opposite to the acoustic radiation direction) is relative to the acoustic radiation direction. Since it is interrupted | blocked, it can suppress that the sound wave emitted from the back side of the diaphragm 2 is radiated | emitted toward an acoustic radiation direction.

  [Edge 5] The edge 5 is disposed between the diaphragm 2 and the frame 3, and the inner peripheral portion supports the outer peripheral portion of the diaphragm 2, and the outer peripheral portion is joined to the frame 3, whereby the diaphragm 2 Is held in place. Specifically, the edge 5 supports the diaphragm 2 so as to vibrate along the vibration direction (Z-axis direction) and brakes in a direction orthogonal to the vibration direction. The illustrated edge 5 is formed in a ring shape (annular shape) when viewed from the acoustic radiation direction. As shown in FIG. 2B, the edge 5 has a cross-sectional shape that is a prescribed shape, such as a convex shape, a concave shape, or a corrugated shape. In the present embodiment, the edge 5 is formed in a concave shape in the acoustic radiation direction. Not limited to this, it may be formed in a convex shape in the acoustic radiation direction. The edge 5 can employ, for example, leather, cloth, rubber, resin, those obtained by applying a sealing process thereto, a member formed by molding rubber or resin, etc. into a prescribed shape, or the like.

  [Magnetic Circuit 40] The magnetic circuit 40 is disposed in the frame 3. 2B, the illustrated magnetic circuit 40 is accommodated in the frame 3, and a magnetic gap 40G is formed along the planar bottom surface 31A of the frame 3. As shown in FIG. As the magnetic circuit 40, for example, an inner magnet type magnetic circuit, an outer magnet type magnetic circuit, or the like can be adopted.

  The specific structure of the magnetic circuit 40 includes a yoke 41 and a magnet 42 as shown in FIGS. The illustrated magnetic circuit 40 includes a plurality of magnets 42A to 42D. In this magnetic circuit 40, the magnets 42 are provided on both sides along the direction of the magnetic field of the magnetic gap 40G. For example, the magnetic gap 40G is formed along the X-axis direction so that the voice coil 60 can move within a specified range along the X-axis direction.

  The yoke 41 has a lower flat portion 41A, an upper flat portion 41B, and a support column portion 41C. The lower flat portion 41A and the upper flat portion 41B are arranged substantially parallel to each other at a specified interval, and the column portion 41C is substantially perpendicular to the lower flat portion 41A and the upper flat portion 41B at the center. It is formed to extend to.

  When an audio signal (current) flows through the voice coil 60 in the magnetic field of the magnetic gap 40G, Lorentz force is generated along the direction perpendicular to the direction of the magnetic field and the direction of the current according to the Fleming left-hand rule. The speaker device 1 according to the present embodiment is along a specified direction different from the vibration direction of the diaphragm 2, specifically, a direction (X-axis direction) orthogonal to the vibration direction (Z-axis direction) of the diaphragm 2. The voice coil 60 and the magnetic circuit 40 are configured such that a Lorentz force is generated in the voice coil 60 and the voice coil 60 vibrates along the X-axis direction. Magnets 42A to 42D are arranged on the flat portions 41A and 41B, and one magnetic gap 40G1 is formed by the magnet 42A and the magnet 42C, and another magnetic gap 40G2 is formed by the magnet 42B and the magnet 42D. The pair of magnetic gaps 40G1 and 40G2 are formed side by side in a plane, and magnetic fields in opposite directions are formed.

  On the other hand, when the ring-shaped voice coil 60 according to the present embodiment is viewed from the acoustic radiation direction (SD), the planar shape is formed in a substantially rectangular shape, and the linear portion 60A formed along the Y-axis direction. , 60C and linear portions 60B, 60D formed along the X-axis direction. The linear portions 60A and 60C of the voice coil 60 are disposed in the magnetic gap 40G of the magnetic circuit 40, 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 60B and 60D of the voice coil 60. Further, even when a magnetic field is applied to the straight portions 60B and 60D, the Lorentz forces generated in the straight portions 60B and 60D are configured to cancel each other.

  In addition, the voice coil 60 according to the present embodiment is formed in a thin flat plate shape, and by relatively increasing the number of turns, the portion in the magnetic gap 40G can be relatively large, and the speaker is driven. A relatively large driving force can be obtained.

  Then, in the magnetic circuit 40 according to the present embodiment, as shown in FIG. 5, the direction of the magnetic field applied to the linear part 60A of the voice coil 60 is opposite to the direction of the magnetic field related to the linear part 60C. A plurality of magnets 42A to 42D are magnetized. In addition, the voice coil 60 is formed in an annular shape so that a voice signal flows through each of the linear portion 60A and the linear portion 60C of the voice coil 60 in the opposite directions.

  In such a speaker device 1, when an audio signal is input to the voice coil 60, the Lorentz force generated in the straight portion 60 </ b> A and the Lorentz force generated in the straight portion 60 </ b> C are in the same direction, for example, one of the straight portions 60 </ b> A and 60 </ b> C. Compared with a configuration in which a magnetic field is applied only to one side, the driving force is doubled. Therefore, the magnetic circuit 40 and the voice coil 60 having such a configuration can be configured to be relatively thin, and a relatively large driving force can be obtained.

  [Voice Coil Support Unit 6] The voice coil support unit 6 includes the above-described voice coil 60, and is formed to be movable along different directions with respect to the vibration direction of the diaphragm 2. In the illustrated example, the frame 3 is disposed so as to be capable of vibrating along a magnetic gap 40G formed along the planar bottom surface 31A of the frame 3. More specifically, the voice coil support portion 6 according to the present embodiment is formed to be movable only along the X-axis direction, and movement is restricted in other directions. The restriction of the movement range of the voice coil support part 6 is provided with the damper 8 as a restriction part in the present embodiment, but is not limited to this form. For example, a restricting means such as a rail, a guide member, or a groove portion can be provided.

  The voice coil support portion 6 has a planar insulation having a shape in which the voice coil 60 is disposed in the magnetic gap 40G of the magnetic circuit 40 and extends from the voice coil 60 to the outside of the magnetic gap 40G along the moving direction. A member 61 is provided. The voice coil support portion 6 has an opening 62, and a voice coil 60 is provided along the outer periphery of the opening 62. Since the voice coil support portion 6 having such a structure can have a structure in which the voice coil 60 is embedded in the insulating member 61, the strength of the voice coil 60 can be reinforced thereby. Distortion can be reduced.

  In the example shown in the drawing, the opening 62 is loosely fitted to the support column 41C of the magnetic circuit 40, and the movement range of the voice coil support 6 is restricted in this state. Specifically, the opening 62 is formed in a rectangular shape, and the interval between both sides along the moving direction of the voice coil support portion 6 is formed to be approximately the same as or larger than the width of the support column portion 41C. The interval between both sides in the direction orthogonal to the direction is formed to be relatively large corresponding to the movement range of the voice coil support 6.

  [Vibration direction conversion section 7] The vibration direction conversion section 7 is a link portion (first portion) formed between the voice coil support section 6 and the diaphragm 2 by the vibration of the voice coil support section 6 and the reaction force received from the frame 3. A link mechanism for converting the angle of the link portion 70). Specifically, in the example shown in FIGS. 2 and 3, the first link portion 70 having one end as a joint portion 70 </ b> A with the voice coil support portion 6 and the other end as a joint portion 70 </ b> B with the diaphragm 2; The second link portion 71 has one end as a joint portion 71A with the intermediate portion of the first link portion 70 and the other end as a joint portion 71B with the frame 3, and the first link portion 70 and the first link portion 70 The two link portions 71 are inclined in different directions with respect to the vibration direction (for example, the X-axis direction) of the voice coil support portion 6.

  A link part here is a part for forming a link mechanism, Comprising: It is a part which does not deform | transform fundamentally (it has rigidity), and has a joint part in the both ends. The joint can be formed by joining two members in a rotatable manner, or can be formed as a refracted portion where one member can be refracted at an arbitrary angle. In the example shown in FIG. 2B, the joint portion 71 </ b> B is formed on a support portion 34 (stationary portion) formed to protrude on the bottom surface 31 </ b> A of the frame 3.

  In the example shown in FIGS. 2 and 3, a link mechanism is formed by the first link portion 70, the second link portion 71, and the joint portions 70A, 70B, 71A, 71B. In this example, the joint portion 71B between the second link portion 71 and the frame 3 is a joint portion where the position is not displaced, and the other joint portions 70A, 70B, 71A are joint portions whose positions are displaced. Thus, the entire link mechanism is structured to receive a reaction force from the frame 3 at the joint portion 71B. In this link mechanism, when the joint portion 70A moves in the X-axis direction due to the vibration of the voice coil support portion 6, the joint portion 70B moves along the Z-axis direction, and the direction of the vibration of the voice coil support portion 6 is changed. To the diaphragm 2.

  The vibration direction converter 7 according to the embodiment of the present invention can be formed by a plate-like member having a linear refracting portion, and this refracting portion can be used as the joint portion of the link mechanism described above. That is, in the illustrated example, the first link portion 70 and the second link portion 71 are formed by plate-like members, and the joint portions 70A, 70B, 71A, 71B of the link mechanism are formed by linear refracting portions. Can do. According to this, since the joint portion with the diaphragm 2 can be joined linearly, the planar diaphragm 2 can be uniformly vibrated along the width direction, and the entire diaphragm is substantially omitted. It is possible to vibrate with the same phase. That is, it is possible to reproduce the high-frequency region particularly by suppressing the occurrence of divided vibration. In addition, since each link portion has rigidity, vibrations in the natural vibration mode are less likely to occur, and the flexural vibration of the link portion is prevented from adversely affecting the vibration of the diaphragm 2, and acoustic characteristics are reduced. Can be suppressed.

  Although the vibration direction conversion unit 7 according to the present embodiment is not illustrated, for example, a ventilation hole may be formed. The vent hole can reduce local fluctuations in the air pressure in the space surrounded by the diaphragm 2 and the frame 3 when the speaker vibrates, and suppresses the braking of the vibration direction conversion unit 7 due to the air pressure. Further, for example, a hollow portion is formed in the link portion by the vent hole, and the link portion can be reduced in weight, thereby enabling high-frequency reproduction. Further, the weight reduction of the vibration direction converter is particularly effective for widening the reproduction characteristics and increasing the amplitude and sound pressure level of the sound wave for a predetermined audio current.

  Moreover, you may make it the vibration direction conversion part 7 consist of an integral component connected with the refractive part. In this case, the vibration direction changing part 7 forming the complicated link mechanism can be immediately joined to the voice coil support part 6 and the diaphragm 2, and the assembly of the apparatus is improved. Moreover, the vibration direction conversion part 7 can also be formed integrally with the voice coil support part 6 and the diaphragm 2, for example.

  [Damper 8] The damper 8 holds the voice coil support 6 at a specified position in the magnetic gap 40G so that the voice coil support 6 does not contact the magnetic circuit 40, and also moves the voice coil support 6 in the vibration direction ( It is supported so as to be movable along the X axis direction). The damper 8 restricts the voice coil support 6 from moving in a direction different from the vibration direction of the voice coil support 6, for example, in the Z-axis direction or the Y-axis direction.

  The damper 8 according to the present embodiment is formed in, for example, a plate shape and has flexibility. The damper 8 has a shape in which a cross-sectional shape in the Y-axis direction is formed in a curved shape and can be bent. Further, the damper 8 has a predetermined thickness in the Z-axis direction (larger than the thickness in the X-axis direction), and is particularly formed in a shape having rigidity in the Z-axis direction. The damper 8 may be formed in various shapes such as a uniform, non-uniform thickness such as a convex shape, a concave shape, and a corrugated shape. The damper 8 has one end joined to the voice coil support 6 and the other end joined to the frame 3. The damper 8 is not limited to this configuration. For example, the damper 8 may have a configuration in which one end is joined to the voice coil support 6 and the other end is joined to the magnetic circuit 40.

  In addition, the movement restriction or support of the voice coil support 6 may be provided on the frame 3 with, for example, a rail, a groove, a step, a guide member, or the like, instead of the damper 8 described above. That is, the speaker device 1 can also have a structure in which the voice coil support portion 6 slides in a state where the end portion of the voice coil support portion 6 is fitted to a rail, a groove portion, a step portion, or the like.

  [Operation] FIG. 6 is an explanatory diagram for explaining the operation of the speaker device 1 according to the embodiment of the present invention. Specifically, FIG. 6B shows the state of the vibration direction converter 7 with the diaphragm 2 positioned at the reference position, and FIG. 6A shows the state where the diaphragm 2 is displaced toward the acoustic radiation side with respect to the reference position. FIG. 6C shows the state of the vibration direction conversion unit 7 in a state where the vibration plate 2 is displaced in the opposite direction with respect to the acoustic radiation side with respect to the reference position. Show.

  As described above, the joint portion 71B is the only joint portion whose position does not change, and is supported by the frame 3, and applies a reaction force from the frame 3 to the link mechanism. As a result, when the voice coil support portion 6 moves from the reference position X0 by X1 in the X-axis direction, as shown in FIG. 6A, the first link portion 70 and the second link portion 70 inclined in different directions are arranged. The angle of the link portion 71 rises at substantially the same angle, and the joint portion 70B reliably pushes up the diaphragm 2 from the reference position Z0 in the Z-axis direction by Z1 in response to the reaction force from the frame 3 at the joint portion 71B. When the voice coil support portion 6 moves from the reference position X0 by X2 in the direction opposite to the X axis, as shown in FIG. 6C, the angle between the first link portion 70 and the second link portion 71 is almost equal. The joint portion 70B receives the reaction force from the frame 3 at the joint portion 71B, and the joint portion 70B reliably pushes down the diaphragm 2 from the reference position Z0 in the opposite direction to the Z axis by Z2.

  Here, the length a of the link part from the joint part 70A to the joint part 71A, the length b of the link part from the joint part 71A to the joint part 70B, and the length c of the link part from the joint part 71A to the joint part 71B It is preferable that the joint portion 70A and the joint portion 71B are arranged on a straight line in the moving direction of the voice coil support portion 6 with the same. Such a link mechanism is known as a Scott Russell mechanism, and the joint portions 70A, 70B, 71B are on the circumference of the length of the first link portion 70 (a + b = 2a) around the joint portion 71A. It is in. That is, the angle formed by the straight line passing through the joint part 70A and the joint part 71B and the straight line passing through the joint part 70B and the joint part 71B is always a right angle. Thus, when the voice coil support portion 6 is moved in the X-axis direction, the joint portion 70B between the first link portion 70 and the diaphragm 2 always moves along the Z-axis that is perpendicular to the X-axis. The vibration direction of the voice coil support 6 can be converted to a direction perpendicular to the vibration direction and transmitted to the diaphragm 2.

  As described above, the speaker device 1 forms the magnetic gap 40G of the magnetic circuit 40 along a direction different from the vibration direction of the diaphragm 2, and passes along the magnetic gap 40G via the vibration direction conversion unit 7. The vibration of the vibrating voice coil support 6 is transmitted to the diaphragm 2. At this time, it is preferable that the vibration direction of the voice coil support 6 and the vibration direction of the diaphragm 2 are orthogonal to each other. According to this, since the width of each component of the speaker device can be overlapped in a direction different from the width direction of the speaker device (vibration direction of the diaphragm), it is in line with the sound radiation direction compared to a general speaker device. The width of the speaker device (the overall height of the speaker device) can be made relatively small, and the speaker device 1 can be thinned.

  Further, for example, when transmitting the driving force from the voice coil 60 to the diaphragm 2, the speaker device 1 has a mechanical link as compared with a method in which the driving force is transmitted using the bending of the flexible member. Since the driving force is transmitted from the voice coil support 6 to the diaphragm 2 via the mechanism, for example, there is no decrease in response due to distortion of the flexible member, and the diaphragm 2 can be vibrated with relatively high sensitivity. it can. Further, there is no flexible member that is likely to generate resonance (particularly at a low frequency), and the driving force of the driving unit 4 can be efficiently transmitted to the diaphragm 2.

  Further, since the speaker device 1 transmits the driving force generated in the voice coil 60 of the driving unit 4 to the diaphragm 2 through a mechanical link mechanism, the loudspeaker device 1 outputs a large volume. There is no degradation in playback sound quality. Therefore, it is possible to radiate a reproduced sound with a large volume and a high sound quality as compared with the capacitor type speaker device.

  Further, the speaker device 1 has a flat bottom surface 31A, supports the diaphragm 2 along the bottom surface 31A of the frame 3, and can form the magnetic gap 40G along the bottom surface 31A. The whole 1 can be formed flat and thin. Further, the vibration direction converting portion 7 vibrates the diaphragm 2 in a direction intersecting (preferably orthogonal) to the bottom surface 31A by a reaction force from the bottom surface 31A of the frame 3, so that the voice coil support portion along the magnetic gap 40G. The vibration direction of 6 does not directly affect the thickness direction of the speaker device. As a result, it is possible to reduce the overall height of the speaker device 1 while increasing the vibration of the voice coil support portion 6 and increasing the driving force, and it is possible to achieve both high output volume and thin speaker device. It becomes possible. In addition, the voice coil 60 is formed in a thin flat plate shape, and a portion in the magnetic gap 40G can be enlarged by relatively increasing the number of windings. Obtainable.

  7 and 8 are explanatory views of a speaker device according to an embodiment of the present invention. Portions common to the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted. Each of the embodiments shown in FIGS. 7A, 7 </ b> B, and 8 has two features, one of which is that vibration direction conversion sections 7 are provided at both ends of the voice coil support section 6 in the vibration direction. In addition, a parallel link is formed by the link portions of the vibration direction conversion units 7 provided at both ends, and another feature is that a pair of drive units 4 are provided and the vibration direction conversion units 7 are arranged symmetrically opposite each other. It is that.

  Each of the speaker devices 100 and 101 shown in FIGS. 7A and 7B includes a pair of left and right drive units 4 (R) and 4 (L) with respect to one diaphragm 2. 4 (R) and 4 (L) are provided symmetrically. That is, the drive unit 4 (R) is provided with the magnetic circuit 40 (R) and the voice coil support unit 6 (R), and the end of the voice coil support unit 6 (R) on the center side of the diaphragm 2 is the first. One link portion 70 (R) and a second link portion 71 (R) are provided, and one end is a joint with the voice coil support portion 6 (R) at the outer end portion of the voice coil support portion 6 (R). An outer link portion 72 (R) having a portion 72A (R) and the other end of the joint 72B (R) with the diaphragm 2 is provided. Similarly, the drive unit 4 (L) is provided with a magnetic circuit 40 (L) and a voice coil support 6 (L), and at the end of the voice coil support 6 (L) on the center side of the diaphragm 2. A first link portion 70 (L) and a second link portion 71 (L) are provided, and one end of the voice coil support portion 6 (L) is connected to the voice coil support portion 6 (L). An outer link portion 72 (L) having a joint portion 72A (L) and a joint portion 72B (L) with the diaphragm 2 at the other end is provided.

  And the speaker apparatus 100 shown to Fig.7 (a) is a 1st link part in the vibration direction conversion part provided in the diaphragm 2 center side edge part of the voice coil support parts 6 (R) and 6 (L). The joint portion 70B with the diaphragm 2 of 70 (R) and 70 (L) is a common portion, and the joint portion 71B with the frame 3 of the second link portions 71 (R) and 71 (L) is common. It is a part. Accordingly, a rhombus-shaped link mechanism is formed by the joint portions 70B, 71A (R), 71A (L), 71B, and the voice coil support portions 6 (R), 6 (L) are close to each other along the X-axis direction. The direction of the separated vibration is changed to give the vibration in the Z-axis direction (acoustic radiation direction) to the diaphragm 2. Also in this case, since the joint portion 71B is supported by the frame 3, the first link portion 70 (R) against the proximity / separation vibration of the voice coil support portions 6 (R) and 6 (L). , 70 (L) and the second link portions 71 (R), 71 (L) receive a reaction force from the frame 3, and the reaction force reliably vibrates the diaphragm 2 in the Z-axis direction. ing.

  Further, the first link portion 70 (R) and the outer link portion 72 (R) provided on both sides in the vibration direction of one voice coil support portion 6 (R), or both sides in the vibration direction of the voice coil support portion 6 (L). The first link portion 70 (L) and the outer link portion 72 (L) provided in the above form a parallel link, and the voice coil support portions 6 (R) and 6 (L) move in the X direction. The first link portion 70 (R) and the outer link portion 72 (R) that are substantially parallel to each other, or the first link portion 70 (L) and the outer link portion 72 (L) are angle-converted at substantially the same angle. Become. As a result, the three joint portions 70B, 72B (R), 72B (L) move up and down while maintaining the planar state of the diaphragm 2, and cause the planar diaphragm 2 to vibrate in substantially the same phase. Is possible. Thereby, it becomes possible to suppress the divided vibration of the diaphragm 2. At this time, the vibration of the pair of voice coil support portions 6 (R) and 6 (L) is required to vibrate in opposite directions with substantially the same phase and substantially the same amplitude.

  In the speaker device 101 shown in FIG. 7B, the joint portion 70B is separated into the joint portions 70B (R) and 70B (L) and spaced apart, and the joint portion 71B is connected to the joint portions 71B (R) and 71B ( The speaker device 100 is the same as the speaker device 100 shown in FIG. Therefore, the speaker equipment 101 shown in FIG. 7B has the same function as the speaker device 100 shown in FIG. 7A, but the speaker device 101 has four joint portions 70B (R) that move up and down simultaneously. , 70B (L), 72B (R), 72B (L), the diaphragm 2 moves up and down, so that the divided vibration of the diaphragm 2 can be further suppressed.

  The embodiment shown in FIG. 8 is the same as the embodiment shown in FIG. 7 except for the link mechanism of the outer link portion (the example shown in the figure shows a configuration example corresponding to FIG. Similarly, the configuration example corresponding to Fig. 7B can be implemented by changing only the outer link portion (the common portions with Fig. 7 are denoted by the same reference numerals and redundant description is omitted). FIG. 4A is an overall cross-sectional view, and FIGS. 2B and 2C are explanatory views showing the joint portion between the outer link portion and the frame. In the speaker device 102, the outer link portion includes first outer link portions 72 (R) and 72 (L) and second outer link portions 73 (R) and 73 (L). Here, a pair of drive units 4 (R) and 4 (L) that are substantially symmetrical is provided.

  Here, one end is a joint 72A (R) or 72A (L) with the outer portion of the voice coil support 6 (R) or 6 (L), and the other end is a joint 72B (R) with the diaphragm 2. Alternatively, the joint portion 73A (the first outer link portion 72 (R), 72 (L), which is 72B (L), and one end of the first outer link portion 72 (R) or 72 (L) is an intermediate portion. R) or 73A (L), and second outer link portions 73 (R) and 73 (L) having the other end as a joint portion 73B (R) or 73B (L) with the frame 3. In the illustrated example, the joint portions 73 </ b> B (R) and 73 </ b> B (L) are supported by the frame 3 via the support portion 35.

  The joint portions 73B (R) and 73B (L) between the second outer link portions 73 (R) and 73 (L) and the frame 3 will be described. As shown in FIG. (R) has an opening 63, and the end of the second outer link portion 73 (R) may be supported by the frame 3 via the support 35 via the opening 63, or As shown in FIG. 7C, the second outer link portion 73 (R) is formed in a gate shape at the end and straddles the voice coil support portion 6 (R), and the end portion is supported by the frame 3. (Only the example of the right side (R) is shown in the figure, but the left side is the same (substantially left-right symmetric)).

  According to such an embodiment, the link mechanism that receives the reaction force from the frame can be formed even at the link portion of the outer end portion of the voice coil support portions 6 (R) and 6 (L). Since the first outer link portions 72 (R) and 72 (L) are angle-converted using the reaction force from the frame 3 with respect to the movement of 6 (R) and 6 (L), the diaphragm is surely 2 can be moved up and down.

  In this embodiment, the link mechanism including the first link portions 70 (R) and 70 (L) and the second link portions 71 (R) and 71 (L) is used as the voice coil support portion 6 (R). , 6 (L) always receives a reaction force from the frame 3 when moving along the X-axis direction, so that the diaphragm 2 is moved when the diaphragm 2 is moved up and down (moved in the Z-axis direction). It is possible to prevent the voice coil support portions 6 (R) and 6 (L) from moving up and down due to the reaction force received from. As a result, the voice coil support portions 6 (R) and 6 (L) can be smoothly vibrated, and this vibration can be smoothly transmitted to the diaphragm 2.

  FIG. 9 is an explanatory view showing a part of the speaker device according to the embodiment of the present invention (FIG. 9A is a side view, and FIGS. 9B and 9C are plan views of the vibration direction conversion unit). . Here, another embodiment of a vibration direction changing portion that changes the direction of vibration of the voice coil support portion 6 and transmits the vibration to the diaphragm 2 is shown.

  This vibration direction changing part has a first link part 170 having one end as a joint part 170A with the voice coil support part 6 and the other end as a joint part 170B with the diaphragm 2, and one end as a first link part 170. A second link portion 171 having a joint portion 171A with the intermediate portion and a joint portion 171B with the other end of the frame 3, and a voice coil support portion 6 extending integrally therewith. A third link portion 172 consisting of a part of the second link part, a fourth link part 173 fixed along the diaphragm 2 or consisting of a part of the diaphragm 2, and one end of the third link part 172 as the end of the third link part 172 The first link portion 170, the fifth link portion 174, and the fifth link portion 174. The fifth link portion 174 has a joint portion 174A with the other portion and the other end has a joint portion 174B with the fourth link portion 173. 3 link portions 172 and 4 link portion 173 forms a parallel link, respectively.

  According to such a vibration direction conversion part, when the joint part 170A moves from the reference position X0 in the X-axis direction to X1 due to the vibration of the voice coil support part 6, the third link part forming a parallel link thereby. The angle change is performed so that the first link portion 170 and the fifth link portion 174 rise while maintaining the parallel state of the 172 and the fourth link portion 173. At that time, since the joint portion 171B is supported by the frame 3, the angle conversion between the first link portion 170 and the fifth link portion 174 is reliably performed in response to the reaction force from the frame 3, and the voice coil is supported. The displacement of the portion 6 from the position X0 to the position X1 is reliably converted into the displacement of the diaphragm 2 from the position Z0 to the position Z1.

  Similarly, when the joint portion 170A moves from the reference position X0 in the X-axis direction to X2, the third link portion 172 and the fourth link portion 173 forming a parallel link thereby maintain a parallel state, The angle is changed so that the first link portion 170 and the fifth link portion 174 fall down. At that time, since the joint portion 171B is supported by the frame 3, the angle conversion between the first link portion 170 and the fifth link portion 174 is reliably performed in response to the reaction force from the frame 3, and the voice coil is supported. The displacement of the part 6 from the position X0 to the position X2 is reliably converted into the displacement of the diaphragm 2 from the position Z0 to the position Z2.

  According to such an embodiment, the Z-axis at the two joint portions 170B and 174B and the fourth link portion 173 in which the vibration in the X-axis direction of one voice coil support portion 6 vibrates with substantially the same phase and substantially the same amplitude. It will be converted into vibration in the direction. As a result, the diaphragm 2 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 portion 6 with respect to the planar diaphragm 2 having a large area is provided. Can be transmitted in substantially the same phase.

  In the link mechanism of the vibration direction changing portion shown in FIG. 9A, each link portion can be formed by a plate-like member as shown in FIGS. Each joint portion may be one in which the link portions are joined so as to be rotatable, or the link portions may be connected or integrated in a refractive manner. The plate-like member is preferably a highly rigid and lightweight member, and a fiber reinforced plastic film or the like can be used.

  In the example of FIG. 9B, the third link portion 172, the fourth link portion 173, and the fifth link portion 174 are arranged in parallel with each other, and the first link portion 170 is formed in a bifurcated manner. A joint portion 171A with the second link portion 171 is formed in the middle portion of the lever, and the second link portion 171 includes a third link portion 172, a fourth link portion 173, and a third link portion 172 arranged in parallel with each other. Between the five link portions 174.

  In the example of FIG. 5C, the third link portion 172, the fourth link portion 173, and the fifth link portion 174 are arranged at the center, and the joint portion is located at the middle position on both sides of the first link portion 170. 171A is provided, and the second link portion 171 is formed on both sides of the first link portion 170 extending at the center.

  By forming the link portion with a single plate-like member in this way, the diaphragm 2 can be supported and vibrated on the surface, and hence the entire diaphragm 2 can be vibrated substantially in the same phase. It becomes possible to suppress vibration. Moreover, although a link part can also be formed with a some plate-shaped member, a manufacturing process can be simplified by forming with one plate-shaped member. When forming a link part with one plate-shaped member, you may cut out a link member from one plane-shaped plate-shaped member. In the embodiment shown in FIG. 9, as in the example shown in FIG. 7, a pair of drive units can be provided and the vibration direction conversion units can be arranged opposite to each other substantially symmetrically. In this case, vibrations having substantially the same phase can be applied by supporting the diaphragm 2 at more places, so that generation of divided vibration can be further suppressed.

  FIG. 10 is an explanatory view showing a part of the speaker device according to the embodiment of the present invention (FIG. 10 (a) is a side view, FIG. 10 (b) is a perspective view, and FIG. 10 (c) is an exploded perspective view). ). Here, another embodiment of the vibration direction changing unit that changes the direction of the vibration of the voice coil support unit 6 and transmits the vibration to the diaphragm 2 is shown. Here, an example is shown in which a pair of drive units are provided and the vibration direction conversion units are arranged so as to face each other substantially symmetrically, and the vibration direction conversion unit is formed as an integral part.

  In the vibration direction conversion unit according to this embodiment, one end is a joint part 270A (R), 270A (L) with the voice coil support part 6, and the other end is a joint part 270B (R), 270B ( L) and a pair of first link portions 270 (R) and 270 (L). One end is a joint part 271A (R), 271A (L) with an intermediate part of the first link parts 270 (R), 270 (L), and the other end is a frame 3 (a sixth link part 275 described later). ) And a pair of second link portions 271 (R) and 271 (L) as joint portions 271B (R) and 271B (L). Furthermore, a pair of third link portions 272 (R) and 272 (L) integrally extending from the voice coil support portion 6 and a fourth link portion 273 fixed along the diaphragm 2 are provided. Have. One end is a joint part 274A (R), 274A (L) with the end of the third link part 272 (R), 272 (L), and the other end is a joint part 274B with the fourth link part 273. A pair of fifth link portions 274 (R) and 274 (L) are provided as (R) and 274B (L). Then, joint portions 270B (R) and 270B (L) of the first link portion 270 and the diaphragm 2 (fourth link portion 273) are formed at both ends of the fourth link portion 273, and the second link The joint portions 271B (R) and 271 (L) of the portions 271 (R) and 271 (L) and the frame 3 (a sixth link portion 275 described later) have a length substantially equal to that of the fourth link portion 273. 6 link portions 275 are formed at both ends. Furthermore, the first link portion 270 (R) and the fifth link portion 274 (R) or the first link portion 270 (L) and the fifth link portion 274 (L) form a parallel link, The three link portions 272 (R), 272 (L) and the fourth link portion 273 each form a parallel link.

  Such a link mechanism of the vibration direction changing portion is substantially equivalent to the link mechanism of the embodiment shown in FIG. 9 which is disposed substantially symmetrically opposite to each other and the joint portions 174B are spaced apart. In this example, each link portion is formed by a plate-like member, each joint portion between the link portions is formed by a linear refracting portion, and the link portions are integrally formed via the refracting portion.

  In addition, an inclined surface is formed at the end of each link portion in the vicinity of each joint portion. In particular, the inclined surface is formed on the side surface opposite to the side surface of the link portion that approaches each other when the link portion is refracted at the joint, so that the link portion can be refracted efficiently at the joint. Yes. And the vibration direction conversion part which has such a link mechanism is an integral part as shown in FIG.10 (b), and the junction part 200 of the voice coil support part 6 is formed in the edge part.

  Moreover, the vibration direction conversion part of this embodiment refracts the whole one plate-shaped member which forms a link part to convex base shape, and makes 1st link part 270 (R), 270 (L) and 4th link. A portion 273 is formed, and the plate-like member is partially cut out and refracted into a concave shape to form second link portions 271 (R) and 271 (L) and a sixth link portion 275.

  Further, as shown in FIG. 10C, the vibration direction changing portion is formed by bonding two plate-like members 201 and 202, and the first link portion 270 (R ), 270 (L), the second link portion 271 (R), 271 (L), the fourth link portion 273, and the sixth link portion 275, and the other plate-like member 202 has a third Link portions 272 (R) and 272 (L) and fifth link portions 274 (R) and 274 (L) are formed. The third link portions 272 (R), 272 (L) and the fifth link portion 274 (R) along the first link portions 270 (R), 270 (L) and the fourth link portion 273. , 274 (L) and the opening 202 A corresponding to the second link portions 271 (R), 271 (L) and the sixth link portion 275 is formed in the plate member 202.

  In the example shown in FIG. 10C, the size of the opening 202A formed in the other plate-like member 202 corresponding to the second link portions 271 (R) and 271 (L) and the sixth link portion 275 is as follows. The other plate-like member 202 is formed so as to expand from one end to the inside. By doing so, the second link portions 271 (R), 271 (L) and the sixth link portion 275 do not come into contact with the other plate-like members 202, and the link mechanism moves smoothly. Can be made.

  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 coil support units 6, a speaker having a pair of drive units The assembly work can be easily performed even when the apparatus is formed. In addition, by providing the sixth link portion 275, the joint portion 271B is particularly effective against the opposing vibration of the voice coil support portion 6 (the plurality of voice coil support portions 6 vibrate in opposite directions). Even if (R) and 271B (L) are not attached to the frame 3, the positions of the joint portions 271B (R) and 271B (L) on the frame 3 are always kept constant. Incorporation of the vibration direction converter into the speaker device can be simplified.

  As the link mechanism, the right first link portion 270 (R) and the third link portion 274 (R), and the left first link portion 270 (L) and the third link portion 274 (L). Accordingly, the fourth link portion 273 fixed to the diaphragm 2 can be stably translated along the Z-axis direction with respect to the opposing vibration of the voice coil support portion 6. As a result, it is possible to apply stable vibration to the planar diaphragm 2.

  The embodiment shown in FIG. 11 is an improved example of the embodiment shown in FIG. In the example shown in FIG. 11A, the convex portion 210 is provided on the link portion where bending easily occurs due to the opposing vibration of the voice coil support portion 6 to increase the rigidity. In the illustrated example, the first link portions 270 (R), 270 (L), the second link portions 271 (R), 271 (L), the third link portions 272 (R), 272 (L), Protrusions 210 are provided on the sixth link portions 275, respectively. Further, in the example shown in FIG. 5B, an opening 220 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 220 is provided in the fourth link portion 273. 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.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 12 is a perspective view of the speaker device 100S according to the embodiment of the present invention. 13 is a cross-sectional perspective view of the speaker device 100S shown in FIG. FIG. 14 is a top view of a main part of the speaker device 100S shown in FIG. FIG. 15 is a top view of a main part of the speaker device 100S shown in FIG. Hereinafter, the parts described in the above-described embodiment are denoted by the same reference numerals, and a part of the description is omitted. In FIGS. 14 and 15, the diaphragm is omitted. In FIG. 13, a part of the magnetic circuit on the right side in the drawing is omitted.

  The speaker device 100 </ b> S includes the diaphragm 2, the frame 3, the edge 5, the magnetic circuit 40, the voice coil support unit 6, the vibration direction conversion unit 7, and the damper (regulation unit) 8 as described in the above-described embodiment. In this embodiment, the frame 3 has a rectangular outer periphery, and a planar diaphragm 2 having a rectangular outer periphery corresponding to the shape is disposed in the rectangular opening 30 of the frame 3. An edge 5 is provided on the outer peripheral edge of the diaphragm 2, and the entire periphery of the diaphragm 2 is supported by the outer peripheral edge of the frame 3 via the edge 5.

  The pair of voice coil support portions 6 driven by the pair of magnetic circuits 40 (R) and 40 (L) are provided with vibration direction conversion portions 7 at both ends along the vibration direction. In this embodiment, a pair of first link portions 70 (R) and 70 (L) and second link portions 71 (R) and 71 (L) are provided at the center, and the outside of each voice coil support portion 6. Are provided with outer link portions 72 (R) and 72 (L).

  The first link portions 70 (R) and 70 (L) are joined to the central portion (center of gravity position) of the diaphragm 2 in a refractive manner via a joint portion 70B. On the other hand, the outer link portions 72 (R) and 72 (L) are refracted via the joint portions 72B (R) and 72 (L) at a position closer to the outer peripheral portion than the center portion (center of gravity position) of the diaphragm 2. Joined freely.

  Also, a joint end 75 is formed near the upper ends of the first link portions 70 (R) and 70 (L) and the outer link portions 72 (R) and 72 (L). Is fitted in a groove 21 formed in the diaphragm 2. For example, the joint end 75 is fixed in a state of protruding from the front side surface of the diaphragm 2. This diaphragm 2 is supported by the vibration direction changing portion 7 in a linear manner at three locations, and the linear joint portion 75 becomes a reinforcing material and is embedded inside, so that the strength is relatively high. And the occurrence of deflection of the diaphragm can be suppressed. As a result, the entire diaphragm 2 can be vibrated at substantially the same phase.

  Further, since the first link portions 70 (R) and 70 (L) and the outer link portions 72 (R) and 72 (L) form two opposed parallel links, the voice coil support portion 6 is opposed to the first link portions 70 (R) and 70 (L). Due to the vibration (the plurality of voice coil support portions 6 vibrate so as to be opposite to each other), the three joint portions vibrate with substantially the same phase and substantially the same amplitude. Also by this, the whole diaphragm 2 vibrates with substantially the same phase, and generation of divided vibrations can be suppressed.

  The first link portions 70 (R) and 70 (L) and the outer link portions 72 (R) and 72 (L) are provided with vent holes 70P or 72P. By providing the vent holes 70P and 72P, each link portion of the plate-like member can be vibrated without receiving a large air resistance. Further, by providing the vent holes 70P and 72P, it is possible to reduce the weight of each link portion, and to widen the reproduction characteristics.

  The means for regulating the moving direction of the voice coil support portion 6 includes a damper 8 and a support portion 8A. 8 A of support parts are L-shaped members formed in the longitudinal direction along the both ends of the voice coil support part 6, for example, and support each voice coil support part 6 along a longitudinal direction. The end portion of the support portion 8A is supported on the frame 3 by the damper 8 so as to freely vibrate. In other words, the voice coil support portions 6 are formed so as to be movable only along the X-axis direction by such restriction means. The damper 8 is formed in a substantially symmetrical shape with respect to an axis parallel to the Y-axis direction that crosses between the two magnetic circuits 40 (R) and 40 (L). Specifically, the damper 8 is formed in a convex shape far from the axis.

  Further, in this embodiment, a vent hole 301 is formed in the side portion of the frame 3 to allow air to flow between the inside of the frame 3 and the outside of the frame 3. According to this, it is possible to suppress the braking due to the pressure in the frame 3 from being applied to the vibration of the diaphragm 2, and it is possible to reliably vibrate the diaphragm with a small driving force.

  FIG. 16 is a perspective view of a speaker device 100T according to another embodiment of the present invention. Note that the cross-sectional perspective view of the speaker device 100T shown in FIG. 16 and the top view of the main part of the speaker device 100T shown in FIG. 16 are substantially the same except that the frame in FIGS. 14 and 15 is a yoke. Omitted. Hereinafter, the parts described in the above-described embodiment are denoted by the same reference numerals, and a part of the description is omitted. In FIG. 16, a part of the magnetic circuit on the right side in the drawing is omitted.

  As described in the above-described embodiment, the speaker device 100T includes the diaphragm 2, the yoke 41A, the edge 5, the magnetic circuit 40, the voice coil support unit 6, the vibration direction conversion unit 7, and the damper (regulation unit) 8. In this embodiment, the yoke 43 has a rectangular outer periphery, and the planar diaphragm 2 having a rectangular outer periphery corresponding to the shape is disposed in the rectangular opening 30 of the yoke 43. An edge 5 is provided on the outer peripheral edge of the diaphragm 2, and the entire circumference of the diaphragm 2 is supported by the outer peripheral edge of the yoke 43 through the edge 5.

  The yoke 43 is also a stationary part arranged in a state of being stationary with respect to the voice coil support part. The yoke 43 constituting the drive unit 4 includes a bottom plate portion 44 disposed below the magnet 42 or the plate 46 and a cylindrical portion 45 formed so as to surround the bottom plate portion 44. The yoke 43 that is a stationary part is not intended to be completely stationary. For example, the yoke 43 only needs to be stationary enough to support the diaphragm 2 and is generated when the speaker device 100T is driven. Vibrations may propagate and vibrations may occur throughout the stationary part.

  The pair of voice coil support portions 6 driven by the pair of magnetic circuits 40 (R) and 40 (L) are provided with vibration direction conversion portions 7 at both ends along the vibration direction. In this embodiment, a pair of first link portions 70 (R) and 70 (L) and second link portions 71 (R) and 71 (L) are provided at the center, and the outside of each voice coil support portion 6. Are provided with outer link portions 72 (R) and 72 (L).

  The first link portions 70 (R) and 70 (L) are joined to the central portion (center of gravity position) of the diaphragm 2 in a refractive manner via a joint portion 70B. On the other hand, the outer link portions 72 (R) and 72 (L) are refracted through the joint portions 72B (R) and 72B (L) at a position closer to the outer peripheral portion than the center portion (center of gravity position) of the diaphragm 2. Joined freely.

  Also, a joint end 75 is formed near the upper ends of the first link portions 70 (R) and 70 (L) and the outer link portions 72 (R) and 72 (L). Is fitted in a groove 21 formed in the diaphragm 2. For example, the joint end 75 is fixed in a state of protruding from the front side surface of the diaphragm 2. This diaphragm 2 is supported by the vibration direction changing portion 7 in a linear manner at three locations, and the linear joint portion 75 becomes a reinforcing material and is embedded inside, so that the strength is relatively high. And the occurrence of deflection of the diaphragm can be suppressed. As a result, the entire diaphragm 2 can be vibrated at substantially the same phase.

  Further, since the first link portions 70 (R) and 70 (L) and the outer link portions 72 (R) and 72 (L) form two opposed parallel links, the voice coil support portion 6 is opposed to the first link portions 70 (R) and 70 (L). Due to the vibration (the plurality of boil coil support portions 6 vibrate so as to be opposite to each other), the three joint portions vibrate with substantially the same phase and substantially the same amplitude. Also by this, the whole diaphragm 2 vibrates with substantially the same phase, and generation of divided vibrations can be suppressed.

  The first link portions 70 (R) and 70 (L) and the outer link portions 72 (R) and 72 (L) are provided with vent holes 70P or 72P. By providing the vent holes 70P and 72P, each link portion of the plate-like member can be vibrated without receiving a large air resistance. Further, by providing the vent holes 70P and 72P, it is possible to reduce the weight of each link portion, and to widen the reproduction characteristics.

  The second link portions 71 (R) and 71 (L) have one end as a joint portion 71A with the intermediate portion of the first link portion 70 and the other end as a joint portion 71B with the yoke 44. The link portions 71 (R) and 71 (L) are inclined and arranged in different directions with respect to the vibration direction of the voice coil support portion 6 (for example, the X-axis direction).

  Further, the frame 3 in the example shown in FIG. 2B is replaced with a yoke 43, and the joint portion 71B is formed on a support portion 34 (stationary portion) formed to protrude on the bottom plate portion 44 of the yoke 43. It doesn't matter.

  As shown in FIG. 16, a link mechanism is formed by the first link portion 70, the second link portion 71, and the joint portions 70A, 70B, 71A, 71B. In this example, the joint portion 71B between the second link portion 71 and the yoke 43 is a joint portion where the position is not displaced, and the other joint portions 70A, 70B, 71A are joint portions whose positions are displaced. As a result, the entire link mechanism is structured to receive a reaction force from the yoke 43 at the joint portion 71B. In this link mechanism, when the joint portion 70A moves in the X-axis direction due to the vibration of the voice coil support portion 6, the joint portion 71A moves along the Z-axis direction, and the direction of the vibration of the voice coil support portion 6 is changed. To the diaphragm 2.

  The means for regulating the moving direction of the voice coil support portion 6 includes a damper 8 and a support portion 8A. 8 A of support parts are L-shaped members formed in the longitudinal direction along the both ends of the voice coil support part 6, for example, and support each voice coil support part 6 along a longitudinal direction. The end portion of the support portion 8A is supported on the yoke 43 by the damper 8 so as to freely vibrate. In other words, the voice coil support portions 6 are formed so as to be movable only along the X-axis direction by such restriction means. The damper 8 is formed in a substantially symmetrical shape with respect to an axis parallel to the Y-axis direction that crosses between the two magnetic circuits 40 (R) and 40 (L). Specifically, the damper 8 is formed in a convex shape far from the axis.

  Further, in this embodiment, a vent hole 301 is formed in the side portion of the yoke 43 to allow air to flow between the inside of the yoke 43 and the outside of the yoke 43. According to this, it is possible to suppress the braking due to the pressure in the yoke 43 from being applied to the vibration of the diaphragm 2, and the diaphragm can be reliably vibrated with a small driving force.

  As described above, the speaker device 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. 17 is an explanatory view showing an electronic apparatus including the speaker device according to the embodiment of the present invention. The electronic device 1000 such as a mobile phone or a portable information terminal shown in FIG. 5A or the electronic device 2000 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. 18 is an explanatory view showing an automobile provided with a speaker according to an embodiment of the present invention. In the automobile 3000 shown in the figure, the interior space 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 in the door panel, the protrusion of the door panel is eliminated and the operation space for the driver can be expanded. In addition, since sufficient sound 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.

Claims (9)

A diaphragm, a frame, and a drive unit;
The drive unit is
A magnetic circuit having a magnetic gap in a direction different from the vibration direction of the diaphragm, a voice coil that vibrates along the magnetic gap, and a vibration direction converter that changes the direction of vibration of the voice coil and transmits the vibration to the diaphragm. And
The vibration direction converter is
A first link portion having one end connected to the diaphragm and the other end connected to the voice coil via a joint;
A second link portion having one end connected to an intermediate portion of the first link portion and the other end connected to a stationary portion located on the opposite side of the diaphragm via a joint portion;
The speaker device, wherein a joint portion connecting the first link portion and the voice coil extends substantially parallel to a joint portion connecting the second link portion and the stationary portion.   2. The speaker device according to claim 1, wherein the first link portion is subjected to angle conversion in response to a reaction force from the stationary portion via the second link portion.   The speaker device according to claim 1, wherein the stationary portion is a part of the frame. The joint part connecting the second link part and the stationary part is:
The speaker device according to claim 1, wherein the speaker device extends in a direction different from a vibration direction of the diaphragm and a vibration direction of the voice coil. The first link portion is connected to the diaphragm via a joint;
The speaker device according to claim 1, wherein the joint portion, the second link portion, and the joint portion connecting the stationary portion extend substantially in parallel. The second link part is connected to an intermediate part of the first link part via a joint part,
The speaker device according to claim 1, wherein the joint portion, the second link portion, and the joint portion connecting the stationary portion extend substantially in parallel.   The speaker device according to claim 1, wherein the diaphragm is supported by the frame via an edge having a convex shape on the stationary part side.   An automobile comprising the speaker device according to claim 1.   An electronic apparatus comprising the speaker device according to claim 1.

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