JP2002346476A - Low-frequency vibratory equipment, furniture having low-frequency vibratory equipment builtin, and means of transportaion with low-frequency vibratory equipment builtin seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of generating a vibration with a sufficiently big amplitude and capable of reducing leakage flux by applying technology to a low-frequency vibratory equipment, furniture having the low-frequency vibratory equipment builtin and a means of transportation with the low-frequency vibratory equipment builtin a seat. SOLUTION: A coil bobbing 43 and a low-frequency vibratory section 26 are formed out of metals to constitute a radiation mechanism and a magnetic circuit 24 is constituted in an internal magnet type.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a low-frequency vibration device,
The present invention relates to furniture having a built-in low-frequency vibrating device and a transportation system having a built-in low-frequency vibrating device in a seat, and can be applied to, for example, a seat for listening to music. According to the present invention, the coil bobbin and the low-frequency vibrating portion are formed of metal to constitute the heat radiating mechanism, and the magnetic circuit is constituted by the inner magnet type, so that vibration can be generated with a sufficiently large amplitude, and The magnetic flux can be reduced.

[0002]

2. Description of the Related Art Conventionally, in an acoustic device, an acoustic sensation sheet for transmitting vibrations of a low frequency band, which is particularly low in an audible frequency band, to a body through a skin or a bone of a human body.
An acoustic sensation bed and the like have been proposed.

That is, such an acoustic sensation sheet has a built-in low-frequency vibrator, which is an electric signal-mechanical vibration converter, and generates vibration in a low-frequency band using the low-frequency vibrator. Such an acoustic sensation sheet is used for listening to music to provide a realistic sensation. In the field of welfare and medical care, it is used for rehabilitation, and in the field of amusement industry, a wide range of demands for various bodily sensation simulators are expected.

[0004] On the other hand, in the acoustic sensation bed,
For example, as disclosed in JP-A-2000-2333025,
A low-frequency vibration device is arranged on a bed mat together with a speaker, and peripheral nerves are stimulated through the skin by low-frequency band vibration generated by the low-frequency vibration device. With this, in the acoustic sensation bed, the human body is relaxed and the physical disorder due to stress etc. is eliminated,
Furthermore, it is made to promote a deep sleep.

As such a low-frequency vibration device, for example, Japanese Patent Laid-Open No. 5-292584 proposes a method of generating such a low-frequency vibration by the vibration of a frame having a fixed magnetic circuit. Has been made. That is, in the configuration of the present disclosure, a vibrating body incorporated in the magnetic circuit is held by the frame, and a voice coil is arranged on the magnetic circuit while being held by a predetermined holding member. It has been made to be.

[0006]

The problem to be solved by the present invention is disclosed in Japanese Patent Laid-Open No. 5-292.
In the low-frequency vibrating device disclosed in Japanese Patent No. 584, there is a problem in that heat storage of the voice coil cannot be avoided due to the structure in which the voice coil is hermetically sealed and held therein, whereby the rated input cannot be increased. As a result, this low-frequency vibration device has a problem that vibration cannot be generated with a sufficiently large amplitude.

In the low-frequency vibrating device disclosed in Japanese Patent Application Laid-Open No. 5-292584, a large amount of leakage magnetic flux is generated due to the use of an external magnetic circuit. Accordingly, when magnetic products such as a magnetic card and a floppy (registered trademark) disk are brought close to each other, there is a possibility that magnetic data recorded on these products may be destroyed.

The present invention has been made in view of the above points, and provides a low-frequency vibrating apparatus and a low-frequency vibrating apparatus capable of generating vibration with a sufficiently large amplitude and reducing leakage magnetic flux. It is intended to propose a transportation system in which seats have built-in furniture and a low-frequency vibration device.

[0009]

According to the first aspect of the present invention, a voice coil is formed by winding on a coil bobbin made of metal and applied to a low frequency vibration device. When the vibrating portion is formed of metal and the coil bobbin is connected, a heat radiating mechanism of the voice coil is formed by at least the coil bobbin and the low frequency vibrating portion, so that the magnetic circuit is an internal magnetic type magnetic circuit.

In the invention of claim 4 or claim 5, the invention is applied to furniture having a built-in low-frequency vibration device or a transportation system having a built-in low-frequency vibration device in a seat, and the low-frequency vibration device is made of metal. A voice coil is wound around the coil bobbin to form a voice coil, and a low-frequency oscillating portion is formed of metal and connected to the coil bobbin, so that at least the coil bobbin and the low-frequency oscillating portion form a heat radiating mechanism for the voice coil. The circuit is an internal magnet type magnetic circuit.

According to the first aspect of the present invention, a voice coil is formed by winding a coil bobbin made of metal.
The low-frequency vibrating part is formed of metal and the coil bobbin is connected, so that at least the coil bobbin and the low-frequency vibrating part form a heat radiating mechanism for the voice coil. Can be reduced, and since the magnetic circuit is an internal magnet type magnetic circuit, the leakage magnetic flux can be reduced. Thereby, vibration can be generated with a sufficiently large amplitude, and the leakage magnetic flux can be reduced.

According to the fourth or fifth aspect of the present invention, it is possible to generate a vibration with a sufficiently large amplitude and to reduce the leakage magnetic flux. It is possible to provide a transportation in which the frequency vibration device is built in the seat.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings as appropriate.

(1) First Embodiment (1-1) Configuration of First Embodiment FIG. 2 is a block diagram showing an acoustic system according to a first embodiment of the present invention. In this audio system 1, a digital-to-analog conversion circuit (D / A) 2 performs an analog-to-digital conversion process on a digital audio signal output from a sound source 3 by a compact disk player or the like, and outputs an audio signal based on the analog signal. The preamplifier 4 corrects the frequency characteristics of the audio signal based on the analog signal, and corrects and outputs the sound volume. Drive amplifier 6
Drives the whole-range reproduction speaker 7 with the sound signal output from the preamplifier 4, thereby reproducing the sound signal in the human audible frequency band.

The low-pass filter 8 extracts and outputs an audio signal in a low frequency band of a particularly low frequency in the human audible frequency band from the audio signal output from the preamplifier 4, and outputs the low-pass filter. The low frequency vibration device 10 is driven by the output signal of the filter 8. Thus, in the acoustic system 1, the low-frequency vibration device provides the user with vibration in a low-frequency band.

FIG. 3 is a perspective view showing the sensation sheet 11 on which the low-frequency vibration device 10 is arranged. The low-frequency vibration device 10 is formed in a substantially columnar shape, and is arranged near the pelvis of the seated user on the back and the seated portion of the sensation sheet 11. Thereby, this sensation sheet 11
In the human body, the user is allowed to experience the vibration of the low-frequency vibration device 10 through the pelvis, which is most sensitive to the acoustic sensation caused by bones, whereby the effect of the acoustic sensation is efficiently exhibited.

As shown in a partially enlarged sectional view of FIG. 4, the bodily sensation sheet 11 includes a frame 1 made of a metal plate.
A core material 14 made of, for example, urethane foam is arranged on the front surface side of 3. A through hole having a circular cross section corresponding to the outer shape of the low-frequency vibration device 10 is formed in the core material 14. In the bodily sensation sheet 11, the damping material 17 is disposed in the through hole, and the low-frequency vibration device 10 is disposed on the damping material 17. The bodily sensation sheet 11 is configured such that the upper end surface of the low-frequency vibration device 10 protrudes from the surface of the core material 14 by a predetermined height.

In the bodily sensation sheet 11, a vibration propagation sheet 15 of predetermined hardness made of, for example, urethane foam, and a cover 16 made of leather or the like are sequentially arranged on the surface of the core material 14.
Thereby, the bodily sensation sheet 11 transmits the vibration of the upper end surface of the low frequency vibration device 10 to the seated user's body via the vibration propagation sheet 15 and the cover 16.

FIG. 1 is a sectional view showing the structure of the low-frequency vibration device 10, and FIG. 5 is an exploded perspective view. The low-frequency vibration device 10 is divided into two independent upper and lower spaces by a diaphragm 21, and upper and lower enclosures 22 and 23 are formed above and below the diaphragm 21, respectively.

Here, the upper enclosure 22 holds a voice coil 25 disposed in a gap of a magnetic circuit 24 disposed on the diaphragm 21, and the diaphragm 21 and the voice coil 25 generated by driving the voice coil 25. Is a first enclosure that vibrates a predetermined low-frequency vibrating section 26 by the relative motion of the low-frequency vibrating device 10, thereby generating vibration in a low-frequency band. On the other hand, the lower enclosure 23 forms a closed space, and can secure desired high frequency limit frequency and low frequency limit frequency in the vibration by the low frequency vibration device 10, that is, the desired vibration characteristic. The volume of this closed space is ensured so that the space can be secured.

The low-frequency vibrating section 26 is constituted by sequentially arranging units and the like in a case 27. The case 27 is formed by pressing an iron plate into a predetermined shape and forming a cylindrical shape having a bottom surface at one end and a collar 27AA at the other end. In the low-frequency vibration device 10, the diaphragm unit 29 is disposed in the case 27 to form the lower enclosure 23.

Here, the diaphragm unit 29 is
It is adhered to the flange 27AA by an adhesive and held by the case 27, thereby forming a closed space by the lower enclosure 23. The diaphragm unit 29 includes the diaphragm 2
1 and the magnetic circuit 24 is arranged. That is, FIG.
As shown in FIG.
1 has a substantially disk shape as a whole, and an edge 32 is disposed around the periphery. Here, similarly to a normal speaker, the edge 32 is formed by a shape in which an intermediate portion protrudes toward the upper enclosure 22 by a ring shape so that the cross-sectional shape becomes an arc shape. The edge 32 has a larger stiffness than a normal speaker so that an appropriate low frequency limit frequency f0 can be secured even when the mass of the movable object on the diaphragm 21 is increased by disposing the magnetic circuit 24. It is formed of a material that can be secured. Specifically, in this embodiment, the edge 32 is made of hard rubber.

The diaphragm 21 has a circular shape at the center and projects toward the lower enclosure 23 side.
The magnetic circuit 24 is formed of an iron plate so that sufficient strength can be secured by disposing the magnetic circuit 24.

In the diaphragm unit 29, a magnetic circuit 24 is disposed by sequentially disposing a bottom yoke 33, a permanent magnet 34, a plate 35, and a pole piece 36 in a central concave portion of the diaphragm 21 with an adhesive. Here, the bottom yoke 33
The permanent magnet 3 is formed in a cylindrical shape having a bottom surface.
Numeral 4 is formed in a cylindrical shape by a neodymium magnet, and is arranged such that an end surface of the cylindrical shape, which is a magnetic pole at one end, is located substantially at the center of the bottom surface of the bottom yoke 33.
The plate 35 is formed in a ring shape so as to cover the tip of the bottom yoke 33 and extend inward, and the pole piece 36 is formed in a cylindrical shape. It is formed so as to be coaxially opposed to the inner wall surface of the unit 35 with a predetermined gap therebetween. As a result, the diaphragm unit 29
5 and the pole piece 36, a ring-shaped gap is formed, and the voice coil 25 is arranged in this gap.
The magnetic circuit 24 is formed by an inner magnetic type having a small leakage magnetic flux. The bottom yoke 33, the plate 35, and the pole piece 36 are made of the same material as the corresponding members in a normal speaker.

The low-frequency vibrating device 10 is placed above the diaphragm unit 29 (FIG. 1) arranged in the case 27 in this manner, the upper lid case 40 and the voice coil unit 41.
Are sequentially arranged to form the upper enclosure 22. Thus, the upper enclosure 22 is formed by a closed system that is a closed space.

Here, the upper lid case 40 is formed by pressing a thin iron plate so as to secure appropriate rigidity and elasticity. The upper lid case 40 is formed in a disk shape, and is held together with the diaphragm unit 29 by a peripheral flange on the flange 27AA of the case 27 by bonding.
The upper lid case 40 is formed so that a central circular portion protrudes upward from the peripheral flange in FIG. 1 and a circular through hole is formed in the center of the protruding portion by the circular shape. It has been made to be.

The voice coil unit 41 is positioned so as to close a through hole formed in the center of the upper lid case 40 and to fit the voice coil 25 in the gap of the magnetic circuit 24, and is disposed on the upper lid case 40 by bonding. Is done.
In the voice coil unit 41, as shown in FIG. 7, a voice coil 25 is formed by directly winding a magnet wire around a coil bobbin 43, and the coil bobbin 43 is formed by being connected to the low frequency vibrating section 26 by bonding.

The low-frequency vibrating portion 26 is formed of an iron plate having a thickness greater than that of the upper lid case 40, thereby securing a higher rigidity than the upper lid case 40.
5 can be efficiently propagated, and the heat generated by the voice coil 25 can be efficiently radiated. The low-frequency vibrating section 26 has a circular step formed in the center, and the coil bobbin 43 can be positioned by being guided by the step.

The coil bobbin 43 is formed by processing a brass plate into a cylindrical shape so that heat generated by the voice coil 25 can be conducted efficiently. In the low-frequency vibrating device 10, a lead wire (not shown) is connected to the voice coil, and a voice coil 25 is connected to the drive amplifier 9 via the lead wire.

The low-frequency vibrating apparatus 10 constructed as described above
In the case of, since the mass of the magnetic circuit 24 has a great influence on the low-frequency limit frequency, the material was carefully selected and set to an appropriate mass. Also, in the diaphragm 21, since the mass has a large effect on the low-frequency limit frequency, the material was carefully selected and set so as to have an appropriate mass.

Even when the magnetic circuit 24 is mounted on the diaphragm 21 and the equivalent mass of the diaphragm increases, a sufficient band is secured against the increase in the mass to vibrate the low-frequency vibrating section 26. Sufficient stiffness was ensured at the edge 32 so as to be able to perform. In particular, while a general loudspeaker holds a cone, which is a diaphragm, with a damper and an edge, the low-frequency vibrating apparatus 10 according to the present embodiment has a point in which the diaphragm 21 is supported only by the edge 32. Because of the support system, setting of the stiffness by the edge 32 is important in order to prevent vibration of the vibration shaft and to ensure durability.

(1-2) Operation of First Embodiment In the above configuration, in the acoustic system 1 according to this embodiment (FIG. 2), a digital audio signal obtained from the sound source 3 is used to output a human audio frequency. The audio signal in the band is reproduced by the whole-range reproduction speaker 7 and provided to the user. In addition, the low frequency vibration device 10 is driven by an acoustic signal in a low frequency band, which is particularly low in human audible frequencies, and the vibration of the low frequency vibration device 10 is provided to the user.

In the low-frequency vibration device 10 (FIG. 1), the vibration plate 21 holding the magnetic circuit 24
The internal space is partitioned into two independent upper and lower spaces, and the voice coil 25 is held in the upper enclosure 22 that forms the upper space.

In the low-frequency vibrating apparatus 10, when the voice coil 25 is driven by the input of the acoustic signal, the magnetic circuit 24
The vibration of the voice coil 25 generated by the reaction magnetic force with respect to is transmitted to the low-frequency vibration unit 26 via the coil bobbin 43, and to the user's human body via the low-frequency vibration unit 26,
Low frequency vibrations propagate.

In the low-frequency vibrating device 10, a magnet wire is wound directly on the coil bobbin 43 to form the voice coil 25, and the coil bobbin 43 is formed of an iron plate.
Is connected to the low-frequency vibrating section 26 made of metal, whereby the coil bobbin 43 and the low-frequency vibrating section 26 constitute a heat radiating mechanism for the voice coil 25.
5, the voice coil 25 is heated by the coil bobbin 43 even when the voice coil 25 generates a large amount of heat.
Heat can be quickly dissipated. Thus, the low-frequency vibrating apparatus 10 can reduce the temperature rise of the voice coil 25, and can secure sufficient reliability accordingly.

The upper enclosure 22 holding the low-frequency vibrating section 26 is also formed of a metal iron plate, so that heat conduction transmitted to the low-frequency vibrating section 26 via the coil bobbin 43 is further transmitted to the upper enclosure 22. The voice coil 25 can be diffused, and the heat radiation effect can be further enhanced, whereby the temperature rise of the voice coil 25 can be further reduced, and sufficient reliability can be ensured accordingly.

In the magnetic circuit 24, since the magnetic circuit 24 is of the internal magnet type with little leakage magnetic flux,
Since the entire structure is mainly composed of an iron plate, even when a user carries a magnetic product such as a magnetic card or a floppy disk, the effect of the leakage magnetic flux on these magnetic products can be effectively reduced even when the user is seated. Can be avoided
Destruction of magnetic data in such a magnetic product can be reliably prevented. By adopting an iron plate as a main component in this way, the case 2 can be formed with a small thickness.
7, etc., sufficient strength can be ensured, whereby the overall shape can be reduced in size. Thus, the low-frequency vibration device 10 can be easily arranged not only on the seat but also on furniture such as a sofa, a bed mat, a cushion, and various kinds of appliances.

(1-3) Effects of the First Embodiment According to the above-described configuration, the coil bobbin and the low-frequency vibrating portion are formed of metal to form a heat radiation mechanism, and the magnetic circuit is formed of an internal magnet type. By doing so, vibration can be generated with a sufficiently large amplitude, and leakage magnetic flux can be reduced.

Further, by forming the enclosure with metal, the effect of heat radiation can be enhanced, and the leakage magnetic flux can be further reduced.

(2) Second Embodiment FIGS. 8 and 9 are a sectional view and an exploded perspective view showing a low-frequency vibrating apparatus according to a second embodiment of the present invention. The low-frequency vibrating device 51 generates a sound pressure by a low frequency in addition to the low-frequency vibration. In the configuration shown in FIGS. 8 and 9, the same components as those of the low-frequency vibration device 10 according to the first embodiment described above are denoted by the corresponding reference numerals,
Duplicate description is omitted.

The low-frequency vibration device 51 is arranged on a sheet similarly to the low-frequency vibration device 10 according to the first embodiment, and is driven by a low-frequency acoustic signal. The low-frequency vibration device 51 is divided into two independent upper and lower spaces by the diaphragm 21, and an upper enclosure 22 and a lower enclosure 53 are formed above and below the diaphragm 21, respectively. Here the lower enclosure 53
Is a diaphragm 21 generated by driving the voice coil 25.
The vibration of the gas caused by the movement of the gas is resonated and emitted, whereby the low-frequency vibration device 51 efficiently generates the sound pressure in the low frequency band in addition to the low-frequency vibration.

The low-frequency vibrating device 51 is constituted by arranging units and the like in the upper enclosure 22 and the like in a case 57 sequentially. That is, the case 57 is formed by connecting the duct 57B to the case body 57A. Here, the case body 57A is formed by pressing an iron plate into a predetermined shape.
A bottom surface is formed at one end and a cylindrical shape is formed with a flange 57AA formed at the other end, and a circular through hole is formed substantially at the center of the bottom surface. Duct 5
7B is formed of an iron plate in a cylindrical shape having a flange at one end, and is disposed on the bottom surface of the case main body 57A so as to close a through hole of the case main body 57A through the flange.

The low-frequency vibrator 51 is provided in the case 57
After the intermediate case 58 is arranged, the diaphragm unit 2
9 are arranged to form a lower enclosure 53. Here, the intermediate case 58 is formed into a substantially ring shape by pressing an iron plate, and a collar 58AA is formed around the periphery so as to face the collar 57AA of the case 57. The intermediate case 58 is disposed on the case 57 by screwing the collar 58AA to the collar 57AA of the case 57. The intermediate case 58 is formed such that a section between the outer peripheral side where the collar 58AA is formed and the inner collar 58AB holding the diaphragm unit 29 protrudes toward the upper enclosure 22 in the cross-sectional shape. This effectively avoids an increase in the thickness of the low-frequency vibrating device 51 as a whole, and secures the volume of the internal space by the lower enclosure 53.

Thus, in this embodiment, in the low-frequency vibrating apparatus 51, the lower enclosure 53 as the second enclosure is connected to a resonance space chamber forming a resonance space having a predetermined volume, and to the resonance space. With the resonance duct 57B,
Further, a Helmholtz resonator is formed by the lower enclosure 53, and the vibration of the gas caused by the movement of the diaphragm 21 is resonated by the Helmholtz resonator, so that the duct 5
7B is radiated from the open end.

The low-frequency vibrating device 51 includes the intermediate case 5
After the diaphragm unit 29 and the upper lid case 40 are arranged on the brim formed inside the joint 8 by screwing together,
The voice coil unit 41 is arranged and created.

According to the configuration of FIGS. 8 and 9, even in the case of generating a low-frequency sound pressure and reproducing a low-frequency acoustic signal in addition to the low-frequency vibration, the same as in the first embodiment. The effect of can be obtained.

(3) Other Embodiments In the above-described embodiment, a case has been described in which a magnetic circuit is constituted by a permanent magnet using a neodymium magnet. However, the present invention is not limited to this.
The magnetic circuit may be constituted by a permanent magnet such as a plastic magnet or a samarium cobalt magnet.

Further, in the above-described embodiment, the case where the diaphragm is constituted by an iron plate has been described. However, the present invention is not limited to this, and paper, plastic, fiber, ceramics, metal, alloy, and a composite material thereof can be used. For example, various materials can be appropriately used.

Further, in the above-described embodiment, the case where the edge is made of hard rubber has been described. However, the present invention is not limited to this, and various types of materials such as cloth, resin, metal, alloy, and a composite material thereof can be used. Materials can be used as appropriate.

In the above-described embodiment, the case where the upper enclosure and the lower enclosure are made of an iron plate has been described. However, the present invention is not limited to this, and the point is that if the enclosure has appropriate rigidity and elasticity. Various metals, composite materials, and the like can be appropriately used.

In the above embodiment, the case where the coil bobbin is made of a brass plate has been described.
The present invention is not limited to this, and can be made of aluminum, copper, or an aluminum-magnesium alloy having good thermal conductivity to obtain the same effects as those of the above-described embodiment.

In the second embodiment described above,
Although the case where the duct is arranged in the center of the bottom surface of the lower enclosure has been described, the present invention is not limited to this, and the duct may be arranged at various places as necessary, such as when the duct is arranged to protrude from the side of the lower enclosure. Can be provided.

In the above-described second embodiment,
Although the case where a duct is simply formed by a cylindrical shape with a uniform inner diameter has been described, the present invention is not limited to this, and in a case where a duct is created by changing the inner diameter variously, the duct is configured so that Helmholtz resonance is possible. Thus, effects similar to those of the above-described embodiment can be obtained.

Further, in the above-described embodiment, the case where the present invention is applied to the sensation sheet has been described. However, the present invention is not limited to this. In addition, the present invention can be widely applied to furniture such as sofas and cushions, and further to various appliances, seats of various transportations such as cars, trains, ships, and airplanes. That is, FIG. 10 is a perspective view showing a configuration in which the present invention is applied to a bed mat. The low-frequency vibrating device 10 is built in a bed mat which is a mat to be placed on the bed, and driven by a drive amplifier.

In the above-described embodiment, the case where the sound source is constituted by the compact disk player has been described. However, the present invention is not limited to this. For example, the vibration of the engine is acquired by a pickup arranged in an engine room, and The present invention can be widely applied to the case of driving by various sound sources such as the case of driving a low-frequency vibrating device arranged on a seat by vibration.

[0056]

As described above, according to the present invention, the coil bobbin and the low-frequency vibrating portion are formed of metal to constitute the heat radiating mechanism, and the magnetic circuit is constituted by the internal magnet type, so that a sufficiently large amplitude is obtained. Thus, vibration can be generated, and leakage magnetic flux can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a low-frequency vibration device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating an acoustic system using the low-frequency vibration device of FIG. 1;

FIG. 3 is a perspective view showing a sensation sheet using the low-frequency vibration device of FIG. 1;

FIG. 4 is a cross-sectional view illustrating an arrangement of a low-frequency vibration device in the sensation sheet of FIG. 3;

FIG. 5 is an exploded perspective view of the low-frequency vibration device of FIG.

FIG. 6 is an exploded perspective view showing a diaphragm unit of the low-frequency vibration device of FIG.

FIG. 7 is an exploded perspective view showing a voice coil unit of the low-frequency vibration device of FIG.

FIG. 8 is a sectional view showing a low-frequency vibration device according to a second embodiment of the present invention.

FIG. 9 is an exploded perspective view of the low-frequency vibration device of FIG.

FIG. 10 is a perspective view showing a bed mat according to another embodiment.

[Explanation of symbols]

1 ... Acoustic system, 10, 51 ... Low frequency vibration device,
11 Sense sheet, 21 Vibration plate, 22 Upper enclosure, 23, 53 Lower enclosure, 24 Magnetic circuit, 25 Voice coil, 26
... low frequency vibrating part, 32 ... edge, 34 ... permanent magnet,
43 ... Coil bobbin, 57B ... Duct

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04R 9/02 102 H04R 9/02 102A 9/04 105 9/04 105A F-term (Reference) 3B084 JA03 JA06 JD07 5D012 BA06 BB02 CA04 CA13 5D017 AA13 5D107 AA00 AA02 BB08 CC08 CC09 CC10 CC12 CD05 DD12 5H633 BB08 BB09 BB10 GG03 GG05 GG09 GG17 HH02 HH03 HH14 JA02 JB01

Claims (5)

[Claims] 1. A diaphragm holding a magnetic circuit having a predetermined gap, and an enclosure holding a voice coil disposed in the gap on one side of the diaphragm, and driving the voice coil In a low-frequency vibrating device that vibrates a predetermined low-frequency vibrating part, the voice coil is formed by winding around a coil bobbin made of metal, and the low-frequency vibrating part is formed of metal and the coil bobbin is connected. Thus, a heat radiating mechanism for the voice coil is formed by at least the coil bobbin and the low frequency vibrating section, and the magnetic circuit is an internal magnet type magnetic circuit. 2. The low-frequency vibration device according to claim 1, wherein at least the metal of the coil bobbin is brass, aluminum, copper, or an aluminum magnesium alloy. 3. The low frequency vibration device according to claim 1, wherein said enclosure is formed of metal. 4. A diaphragm holding a magnetic circuit having a predetermined gap, and an enclosure holding a voice coil arranged in the gap on one side of the diaphragm, and driving the voice coil By vibrating a predetermined low-frequency vibrating part and winding it around a coil bobbin made of metal, the voice coil is created, and the low-frequency vibrating part is formed of metal and the coil bobbin is connected, so that at least the coil bobbin is formed. Furniture having a built-in low-frequency vibrating device, wherein the low-frequency vibrating portion forms a heat radiating mechanism for the voice coil, and the magnetic circuit has a built-in low-frequency vibrating device that is an internal magnet type magnetic circuit. 5. A diaphragm holding a magnetic circuit having a predetermined gap, and an enclosure for holding a voice coil disposed in the gap on one side of the diaphragm, and driving the voice coil. By vibrating a predetermined low-frequency vibrating part and winding it around a coil bobbin made of metal, the voice coil is created, and the low-frequency vibrating part is formed of metal and the coil bobbin is connected, so that at least the coil bobbin is formed. A heat radiation mechanism for the voice coil is formed by the low frequency vibration unit, and the magnetic circuit includes a low frequency vibration device, which is an internal magnet type magnetic circuit, built in the seat. Built-in transportation.