JP2003125474A - Multi-functional acoustic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a multi-functional acoustic apparatus in which a vibration motor and a speaker are arranged in a substantially equal plane to provide the good space efficiency of a portable equipment. SOLUTION: The multi-functional acoustic apparatus comprises a rotor 201 of a DC motor arranged in a motor magnet 207 on the inner periphery of a cap-like yoke 103 of a magnetic circuit having an external permanent magnet 109 provided to be magnetically locked to a voice coil 102 fixed to the elliptical diaphragm 101 of an outer shape made of a resin, and a weight 209 deviated to generate a large vibration exciting force by a centrifugal force generated by the rotation and carried on the rotor 201.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of a speaker and a vibration motor that form a multifunctional audio device used in a portable device, and particularly, it is possible to drive the speaker and the vibration motor at the same time. The present invention relates to an overall configuration that can expect characteristics and improve space efficiency.

[0002]

2. Description of the Related Art Conventionally, portable devices such as PHS and mobile phones are received by the vibration of a vibration motor, not by the sound of the received sound, so as not to disturb the quiet environment at the reception of concert halls, hospitals, etc. In many cases, a vibration motor is installed that makes a user of the mobile device sense. On the other hand, not only the reception of the received sound is required, but also a speaker having excellent acoustic characteristics is required. For this reason, conventionally, two vibration motors and speakers are often mounted on a mobile device, space efficiency is deteriorated, and it is difficult to reduce the size and weight of the mobile device and reduce the cost. In order to improve this, recently, in addition to the vibration of the diaphragm of the speaker, a permanent magnet body that magnetically engages with a voice coil on the diaphragm of the speaker is fixed to the frame by a spring, and the vibration is reduced to 100 to 150.
A so-called multifunction device has been announced that can be driven independently at a low frequency of Hz and can vibrate in the same direction as the speaker diaphragm. Hereinafter, typical examples of so-called multifunction devices will be listed and described in detail.

FIG. 6 is a sectional view of a conventional example corresponding to an explanatory view of an electromagnetic induction converter described in Japanese Patent Laid-Open No. 5-85192 (Reference A). FIG. 7 is a half sectional view of a conventional example of a multifunctional device (reference B). FIG. 8 is a cross-sectional view corresponding to the explanatory view described in the already filed application / Japanese Patent Application No. 2000-121852 by the applicant (Document C). In FIG. 6, the electromagnetic induction converter is a so-called inner magnet type (structure in which a permanent magnet is arranged inside the voice coil), and a voice coil 508 is fixed to the center of a diaphragm 506 having a central portion 507. The magnet 510 is fixed to the center of the spring body 511, the diaphragm 506 and the spring body 511 are vertically opposed to each other at a position where the magnet 510 is inserted into the voice coil 508, and one end face of the magnet 510 is a voice coil. 508 is arranged so as to be located in the central portion and housed in a case 512. By applying a low frequency signal or a high frequency signal to the voice coil 508, the spring body 51
1 is vibrated in the pole direction of the magnet 510.

In Document A, the diaphragm 506 and the spring body 511 are composed of a voice coil 508 and a magnet 51.
Since they are configured to move relative to each other through magnetic coupling with 0, when a low frequency signal or a high frequency signal is applied to the voice coil 508, a coupled vibration is generated in the diaphragm 506 and the spring body 511. As a result, there is a problem that distortion occurs during reproduction of voice, music, etc., and the quality thereof deteriorates. In addition, the reproduction of voice and music and the driving of low frequency vibration at the same time are performed by the voice coil 508 and the magnet 5.
Because the low frequency vibration will be superposed on the magnetic coupling with 10,
It was practically impossible because it caused more distortion when playing voice and music.

In Document B, the conventional multifunctional audio device is a so-called external magnet type (structure in which a permanent magnet is arranged outside the voice coil). A concentric cylindrical voice coil 604 is fixed to the center of a speaker diaphragm 603 having a corrugated outer peripheral portion 603a and made of synthetic resin having a dome-shaped center. The outer peripheral portion 603a of the speaker diaphragm 603 is fixed to the frame 609 with an adhesive or the like. An outer peripheral portion 601a of the cylindrical top yoke 601 having an upper surface of a hemispherical shape and an outer peripheral portion yoke 6
The inner peripheral portion 606 a of 06 forms a void 611 that magnetically engages with the voice coil 604. The permanent magnet 602 having a hollow disk shape and magnetized to a single magnetic pole in the thickness direction forms a magnetic circuit with the top yoke 601, the lower yoke 605, and the outer peripheral yoke 606, and at the same time, the parallel springs 607 and 608 form the lower yoke 605 and the outer periphery. The outer portion of the yoke 606 is the frame 6
The permanent magnet body 610, which is fixedly supported by 09, can vibrate in the vibration direction of the speaker diaphragm 603.

An input terminal 612 of a lead wire of a voice coil 604 drawn so as to crawl on a speaker diaphragm 603.
When an AC voltage is applied to a and 612b, a current flows through the voice coil 604 and the speaker diaphragm 603 vibrates in the Y direction to generate sound pressure. At this time, standard 20mmφ
In an acoustic device having a size of about × 5 mm, the permanent magnet body 610 is used.
The resonance frequency of the speaker diaphragm 603 is approximately 110 to 150 Hz, and the primary resonance frequency of the speaker diaphragm 603 is approximately 700 to 900 H.
In many cases, the secondary resonance frequency is set to around 5 kHz. The reproduction of voice and music is performed in the band of 700 to 5 kHz, but the speaker diaphragm 603 and the permanent magnet body 61 are used.
Since 0 is configured to move relative to each other through magnetic coupling between the voice coil 604 and the permanent magnet body 610,
When a low frequency signal or a high frequency signal is applied to the voice coil 604, the speaker diaphragm 603 and the permanent magnet body 610
A coupled vibration occurs in the. As a result, there is a problem that distortion occurs during reproduction of voice, music, etc., and the quality thereof deteriorates.
Further, if the reproduction of voice and music and the low frequency vibration are driven at the same time, the low frequency vibration is superposed on the magnetic coupling between the voice coil 604 and the permanent magnet 610.
It was practically impossible because it caused great distortion when playing back music.

Document C shown in FIG. 8 is a so-called external magnet type (structure in which a permanent magnet is arranged outside the voice coil). To explain using the same reference numerals as in FIG. 7, a concentric cylindrical voice is provided at the center of a speaker diaphragm 603 made of synthetic resin having a corrugated outer peripheral portion 603a and a central portion molded in a dome shape. The coil 604 is fixed. The outer peripheral portion 603a of the speaker diaphragm 603 is fixed to the frame 609 with an adhesive or the like. The outer peripheral portion 601a of the cylindrical top yoke 601 and the inner peripheral portion 606a of the outer peripheral yoke 606, each of which has a semi-spherical upper surface and a cylindrical shape, are formed by the voice coil
04 to define a first air gap 701 that magnetically engages 04.
The hollow disk-shaped permanent magnet 702 includes a top yoke 601,
Outer peripheral portion 703a of lower yoke 703, outer peripheral yoke 606
A magnetic circuit having a second air gap 705 is formed with the inner peripheral portion 606a of the inner peripheral portion 606a, and at the same time, the lower yoke 703 and the outer peripheral portion 606b of the outer peripheral yoke 606 are fixedly supported by the frame 609 by the parallel springs 707 and 708. A permanent magnet body 610 that can vibrate in the vibration direction of 603 is configured. A concentric cylindrical drive coil 706, which is fixed to the frame 609 and has input terminals 704a and 704b, is disposed in the second gap 705. First void 701
The voice coil 604 and the permanent magnet body 610 in FIG.
In the relationship between the drive coil 706 and the permanent magnet body 610 in FIG. 5, only the permanent magnet body 610 can move in the same axial direction as the speaker diaphragm 603, not the relative movement.

An input terminal 612 of a lead wire of a voice coil 604 drawn so as to crawl on a speaker diaphragm 603.
When an AC voltage is applied to a and 612b, a current flows through the voice coil 604 and the speaker diaphragm 603 vibrates in the Y direction to generate sound pressure. At this time, standard 20mmφ
In an acoustic device having a size of about × 5 mm, the permanent magnet body 610 is used.
The resonance frequency of the speaker diaphragm 603 is approximately 110 to 150 Hz, and the primary resonance frequency of the speaker diaphragm 603 is approximately 700 to 900 H.
In many cases, the secondary resonance frequency is set to 5 kHz. The reproduction of voice and music is performed in the band of 700 to 5 kHz, but the speaker diaphragm 603 and the permanent magnet body 610 are used.
Are configured to move relative to each other through the magnetic coupling between the voice coil 604 and the permanent magnet body 610. Therefore, when a low frequency signal or a high frequency signal is applied to the voice coil 604, the speaker diaphragm 603 and the permanent magnet body 610 are applied. Produces a coupled vibration. When a high-frequency signal such as voice or music is applied to the input terminals 612a and 612b, only the speaker diaphragm 603 is excited, and when reproducing voice or music, the speaker diaphragm 603 and the permanent magnet body 610 are interposed. Since there is no coupled vibration, no distortion occurs. When a low frequency signal of 100 to 150 Hz is applied to the input terminals 704a and 704b, only the permanent magnet body 610 is excited and the speaker diaphragm 603 does not operate. In this respect, Document C is superior to Document A and Document B of the conventional example, but when a high frequency signal is applied to input terminals 612a and 612b and a low frequency signal is applied to input terminals 704a and 704b at the same time, a permanent magnet body is used. Since 610 is vibrating at a low frequency, the voice coil 604 in the first gap 701 is relatively moved, and the speaker diaphragm 603 and the permanent magnet body 6 are moved.
Coupling vibration occurs in 10 and distortion occurs in the reproduction of voice, music and the like.

In recent mobile devices, the display area of the liquid crystal panel and the organic EL has become large, making it bright and easy to see. On the other hand, the storage area of the input / output device of the audio device, that is, the speaker or the microphone tends to be reduced. In order to cope with such a tendency, the method of simply reducing the diameter of the circular speaker according to the prior art cannot reduce the sound pressure, and the object cannot be achieved. None of the documents A, B, and C described above disclose the technology to meet such expectations.

[0010]

As is apparent from the above description, in any of the conventional examples, when a low frequency signal and a high frequency signal are simultaneously excited, coupling occurs and the quality of voice, music, etc. deteriorates. It was virtually impossible to prevent. This is because both low frequency vibration and high frequency vibration are configured to vibrate in the same direction as the speaker diaphragm. Further, miniaturization and thinning have not been sufficiently achieved.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to realize a multifunctional acoustic device which has a simple structure, can be made compact and thin, and has a sufficient acoustic output. ,
In particular, it is characterized in that low frequency vibration is realized by the rotational movement of the rotor. Claim 1 of the multifunctional audio device of the present invention made to solve the problem comprises a concentric cylindrical voice coil fixed to a speaker diaphragm and a magnetic circuit magnetically engaging with the voice coil. In the audio device, a cylindrical permanent magnet is provided on the inner peripheral portion of a cap-shaped yoke of a magnetic circuit made of an outer magnet type permanent magnet provided so as to be magnetically engaged with the voice coil. It is characterized in that a rotor of a DC motor is provided to face each other through a gap, and a weight is mounted on the rotor so that a vibrating vibrational force is largely generated by a centrifugal force generated by the rotation.

According to a second aspect of the multifunctional audio device of the present invention made to solve the problem, an audio device comprising a magnetic circuit which magnetically engages with the voice coil is provided. Is fixed to a flat portion of a hollow cap-shaped yoke, and a flat plate made of a magnetic material is provided on a speaker magnet magnetized to a single magnetic pole in the thickness direction having a circular or elliptical axial section on the flat portion. An outer peripheral yoke is disposed, and an inner peripheral surface of the outer peripheral yoke and an outer peripheral surface of the cap-shaped yoke are provided so as to face each other with a gap so as to magnetically engage with the voice coil. A cylindrical magnet magnetized in the diametrical direction is provided on the peripheral side surface, and a rotor shaft for supporting the rotor is fixed to the center of the frame through a gap with the motor magnet, and the rotor shaft is fixed on the rotor. Centrifugation caused by rotation Is characterized in that it arranged so that Katatsumu by decentering the weight so that the vibration pressurized Shinryoku occurs largely by.

The multifunctional acoustic device of the present invention made to solve the problems is characterized in that the outer shape of the diaphragm is circular or elliptical.

The multifunctional acoustic device of the present invention made to solve the problems is characterized in that the outer shape of the speaker magnet is circular or elliptical.

According to a fifth aspect of the multifunctional acoustic device of the present invention made to solve the problems, a rotor of a motor is made of a laminated magnetic material having a plurality of slots and has an eccentric weight on the upper surface. Is mounted, and a flat plate-like commutator is arranged on the lower surface so as to be rotatable.

In a rotor of a motor according to claim 6 of a multifunctional acoustic device of the present invention made to solve the problems, a member having a large specific gravity is provided on either the upper or lower surface of the rotor permanent magnet. It is characterized in that it is arranged eccentrically with respect to the rotor shaft so as to form a single weight so that a large vibration vibration force is generated by the centrifugal force generated by the rotation.

A brush of a multifunctional acoustic device of the present invention made to solve the problem is fixed to a pair of bottom portions of the frame, and a tip end portion of the brush elastically moves an upper surface of the commutator of the rotor. It is characterized by being configured to press.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part of an embodiment of a multifunctional acoustic device of the present invention. FIG. 2 is an exploded perspective view of the motor of the multifunctional audio device of the present invention. Figure 3
(A) is a top view of another embodiment of the present invention. Figure 3
FIG. 3B is a sectional view taken along line XX of FIG. Figure 4 (A) shows
It is a top view from the cover of FIG. FIG. 4B is a sectional view taken along the line YY of FIG. FIG. 5 is a perspective view of the speaker magnet of the multifunctional audio device of the present invention.

In FIG. 1, a multifunctional acoustic device 300 of the present invention comprises a speaker 100 and a motor 200, and the outer shape viewed from the top may be circular, rectangular or elliptical, and its cross section including the major axis is shown. Has been done. The rotor shaft 202 supporting the rotor 201 is fixed to the central bottom portion with a stopper 204, and the cup-shaped frame 108 made of resin or the like.
A cap-shaped yoke 1 made of a magnetic material is provided on the outer peripheral bottom of the
The flat part 105 of 03 is fixed. In the flat portion 105,
A disk-shaped speaker magnet 10 magnetized in a single magnetic pole in the axial direction
9 is fixed, and a voice coil 10 fixed on a diaphragm 101 made of resin or the like is mounted on the speaker magnet 109.
An outer peripheral yoke 106 made of a magnetic material is fixed so that the outer peripheral yoke 106 can be magnetically engaged with 2. The inner peripheral side surface 106a of the outer peripheral yoke 106 and the outer peripheral side surface 10 of the cap-shaped yoke 103.
3a forms a voice coil void 110. The outer periphery of an acoustic cover 107 having a plurality of acoustic holes is fixed to the outer end of the frame 108 on the upper surface of the speaker diaphragm 101.

In FIG. 1 and FIG. 2, the inner peripheral side surface 105 of the hollow cap-shaped yoke 103 whose central portion is hollowed out in a circular shape.
A cylindrical motor yoke 208 is provided with a diametrically magnetized motor magnet 207 whose outer circumference is covered. The motor yoke 208 may be omitted if the cap-shaped yoke 103 is not magnetically saturated. Rotor 2 having a cylindrical bearing 203 having a pair of bearings (not shown)
01 is rotatable with respect to the rotor shaft 202, and the upward expansion of the rotor 201 due to vibration impact is prevented by the enlarged diameter portion 202a of the rotor shaft 202. The rotor 201 has slots 211 formed by stacking magnetic materials.
a, 211b and 211c, and coils 212a, 212
Spiders 210a, 21 wound with b and 212c respectively
0b and 210c and segments 213a, 213b and 2
And a commutator 214 having 13c. A weight 20 mounted on and fixed to the rotor 201 at an eccentric position.
9, a segment of the commutator 214 mounted coaxially with the rotor shaft 202 of the rotor 201, 21
Terminals (not shown) of windings of the coils 212a, 212b and 212c are connected to 3a 213b and 213c in the same manner as a normal DC motor. The rotor 201 is the motor magnet 20.
7 is disposed on the inner circumference of the motor 7 via a motor gap 215, and the tips of the pair of brushes 205, 206 elastically press the surfaces of the segments 213a, 213b, 213c of the commutator 214 to make electrical connection, etc. The ends are connected to a pair of motor input terminals 301 and 302 and connected to an external DC power supply.

In FIGS. 3A, 3B, 4A, and 4B, the elliptical multifunctional acoustic device 400 has an outer shape as viewed from above, and the XX line section is vertically long. , YY line cross section is formed laterally short. Acoustic holes 112a, 112b, 112
The cover 107 having c, 112d, 112e, and 112f is arranged on the upper surface of FIG. The details are shown in Figure 1.
Since it has been described with reference to FIG. 2, detailed description will be omitted.

In FIG. 5, the outer shape of the speaker magnet 109 has a major axis 4 having major axis widths 413 having different radial lengths.
10 has a short shaft 411 having a short shaft width 414, and the inner diameter forms a circular diameter 412. This speaker magnet 103
The shape is because the volume is increased to improve the magnetic flux density of the voice coil void 110 and to increase the force coefficient capable of increasing the acoustic output of the speaker 100. Further, the outer shape of the speaker magnet 103 is not limited to an ellipse, and may be a rectangular shape. If a permanent magnet having a large energy product, such as BH) m of 50 [MGOe] or more, is used, the speaker magnet 103 has a larger shape. The outer shape may be circular. In this case, the outer shape of the diaphragm is formed into an ellipse or a rectangle.

In the embodiment of the present invention, the speaker magnet 103 is used.
Is supplied to the speaker gap 110, and a necessary magnetic flux density is supplied by appropriately designing. In particular,
The energy product is 360-400 [J / m
³ ] (45-50 [MGOe]) NdFeB system sintered magnet can supply a magnetic flux density of 0.4-0.6 [T] (4-6 [kG]).

In the embodiment of the present invention, the motor magnet 2 is used.
The magnetomotive force of 07 is supplied to the motor gap 215, and the required magnetic flux density is supplied by appropriate design. For example, a bond ferrite magnet or a bond NdFeB magnet is selected according to the required specifications.

Next, the operation of the multifunctional acoustic device of the present invention will be described. First, the voice coil input terminals 112 and 113
When a so-called high-frequency signal of a wide band is applied to the voice coil 10 in the voice coil gap 110,
A force acts on Z 2 in the Z direction, the speaker diaphragm 101 of the speaker 100 vibrates in the Y direction to generate sound pressure, and emits sound waves through the acoustic holes 112 a to 112 f of the acoustic cover 107.

When a DC voltage of 3 to 3.6 V is applied to the motor input terminals 301 and 302, the brushes 205 and 206,
Coil 2 of rotor 201 via commutator 214
12a to 212C are energized and activated, and the number of revolutions determined by design specifications, for example, reaches 8,000 rpm. At this time, the mass of the weight 209 of the rotor 201 is M, and the rotor shaft 20 is
The distance from the center of 2 to the center of gravity of the weight 209 is R, and the rotor 2
01 is the friction coefficient with the rotor shaft 202,
Is ω [rad / sec], and the radius of the rotor shaft 202 is r
Then, the load torque TL is expressed by the following equation. TL = μrRω ² M [N · m] (1) Since the rotor 201 has only to bear the load of the load torque TL according to the equation (1), a large motor output is not required. Therefore, it can be expected that the power consumption will be minimal.

A so-called high-frequency signal having a wide band is applied to the input terminals 112 and 113 of the voice coil 102 of the multifunctional audio apparatus of the embodiment of the present invention, so that the motor input terminal 30.
When a direct current voltage of about 3.0 to 3.6 V is simultaneously applied to the first and the second 302, even if the rotor 201 is rotating at a predetermined speed, the magnetic flux density of the voice coil gap 110 hardly changes, so that the speaker 100 is The generated sound pressure is almost the same as when the rotor 201 is not rotating, and the sound quality is not deteriorated.

[0028]

According to the present invention, it is possible to easily realize an elliptic multifunctional audio device which can make a display area of a portable device bright and large and has no dead space in arrangement like a circular speaker and which is space efficient. Is possible.

Further, according to the multifunctional audio apparatus of the present invention, it is possible to faithfully reproduce the broadband signal of the sounding body with a simple structure.

Further, according to the multifunctional acoustic device of the present invention, it is possible to reliably obtain the low-frequency vibration having a large body-excited vibration force by the DC motor with a simple structure.

Further, according to the multifunctional audio device of the present invention, it is possible to drive the speaker by the wide band signal and the vibration by the DC motor at the same time, and the speaker with excellent cost / performance without deterioration of sound quality is provided. Can be realized.

Further, in the conventional example, since the low-frequency vibration having a large amplitude is in the same direction as the vibration of the speaker diaphragm, the thickness of the device is required to some extent. However, according to the multifunctional acoustic device of the present invention, Since the low-frequency vibration is generated in the rotation direction, the magnetic circuit of the speaker magnet and the motor can be arranged in substantially the same plane so as to reduce the thickness of the multifunctional acoustic device, so that the portable device can be downsized. Contributes to thinner products.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of main parts of an embodiment of a multifunctional acoustic device of the present invention.

FIG. 2 is an exploded perspective view of a motor of the multifunctional audio device of the present invention.

FIG. 3A is a top view of another embodiment of the present invention. (B) is a sectional view taken along line XX of (A).

FIG. 4A is a top view from the cover of FIG. 3A. FIG. 3B is a sectional view taken along the line YY of FIG.

FIG. 5 is a perspective view of a speaker magnet of the multifunctional audio device of the present invention.

FIG. 6 is a cross-sectional view of a conventional example corresponding to an explanatory view of an electromagnetic induction type converter described in JP-A-5-85192.

FIG. 7 is a half sectional view of a conventional example of a multi-function device.

FIG. 8 is a cross-sectional view corresponding to an explanatory view described in an already filed application / Japanese Patent Application No. 2000-121852 by the applicant of the present application.

[Explanation of symbols]

100 speaker 101 speaker diaphragm 102 voice coil 103 cap-shaped yoke 103a outer peripheral side surface 104 first flat portion 105 inner peripheral side surface 106 outer peripheral yoke 106a inner peripheral side surface 107 cover 108 frame 109 speaker magnet 110 voice coil void 112, 113 voice coil input terminal 111a, 111b, 111c, 111d, 111e, 11
1f acoustic hole 200 motor 201 rotor 202 rotor shaft 202a diameter expansion parts 205, 206 brush 207 motor magnet 208 motor yoke 209 weights 210a, 210b, 210c spiders 211a, 211b, 211c slots 212a, 212b, 212c coils 213a, 213b, 213c segment 214 commutator 215 motor gap 300 multifunctional acoustic devices 301, 302 motor input terminal 400 elliptical multifunctional acoustic device 410 major axis 411 minor axis 413 major axis width 414 minor axis width

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) H04R 9/02 102 H04R 9/02 102D F Term (Reference) 5D012 BB05 BB08 CA02 CA14 FA02 FA10 GA01 5D016 AA05 5D017 AA16 5D107 AA02 AA03 AA05 AA13 BB08 CC09 CC10 DD12 FF10

Claims (7)

[Claims] 1. An audio device comprising a magnetic circuit magnetically engaging with a concentric cylindrical voice coil fixed to a speaker diaphragm, wherein an external magnet is provided so as to magnetically engage with the voice coil. Type permanent magnet, a cylindrical permanent magnet is arranged on the inner peripheral portion of the cap-shaped yoke of the magnetic circuit, and the rotor of the DC motor is provided opposite to the permanent magnet with a gap, and the rotor is rotated on the rotor. A multifunctional acoustic device equipped with a weight so that a large vibration vibration force is generated by the centrifugal force generated by. 2. An audio device comprising a magnetic circuit magnetically engaged with the voice coil, wherein a flat portion of a hollow cap-shaped yoke made of a magnetic material is fixed to a bottom surface of a frame, and the flat portion is axially arranged on the flat portion. A spin magnetized with a single magnetic pole in the thickness direction with a circular or elliptical cross section.
A plate-shaped outer yoke made of a magnetic material is arranged on the magnet, and an inner peripheral surface of the outer yoke and an outer peripheral surface of the cap-shaped yoke are separated by a gap so as to magnetically engage with the voice coil. A cylindrical motor magnet, which is provided so as to face each other and is magnetized in the diametrical direction on the inner peripheral side surface of the cap-shaped yoke, and which supports the rotor at the center of the frame through a gap with the motor magnet. The spindle is fixed, and the weight is eccentrically arranged so that a large centrifugal vibration force is generated on the rotor due to the rotation, so that the spindle is arranged as a single spindle. The multifunctional acoustic device according to 1. 3. The outer shape of the diaphragm of the multifunctional acoustic device is circular or elliptical.
Alternatively, the multifunctional audio device described in 2. 4. The multifunctional acoustic device according to claim 1, wherein the speaker magnet of the multifunctional acoustic device has a circular or elliptical outer shape. 5. The rotor of the motor of the multifunctional audio device is made of laminated magnetic material having a plurality of slots, has an eccentric weight mounted on the upper surface, and a flat commutator on the lower surface. The multifunctional acoustic device according to claim 1 or 4, wherein the multifunctional acoustic device is installed and configured to be rotatable. 6. The rotor of the motor of the multi-function audio apparatus is provided with a member having a large specific gravity on one of the upper and lower surfaces of the rotor so that a large vibration vibration force is generated by the centrifugal force generated by the rotation. The multifunctional acoustic device according to any one of claims 1 to 5, wherein the multifunctional acoustic device is eccentrically arranged with respect to the rotor shaft so as to form a single weight. 7. The brush of the multifunctional audio device is fixed to the bottom of the frame as a pair, and the tip of the brush is configured to elastically press the upper surface of the commutator of the rotor. The multifunctional acoustic device according to any one of claims 1 to 6, which is characterized by the above-mentioned.