JP2003274467A - Multi-function type acoustic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-function type acoustic apparatus wherein the quality of sound and music is not deteriorated even when a low frequency signal and a high frequency signal are simultaneously excited. <P>SOLUTION: The multi-function type acoustic apparatus is characterized in that a rotary vibrator 200 is formed by mounting a rotary vibrator permanent magnet 201 of a disk shape subjected to multi-pole magnetization on an outer circumferential part of a cylindrical side face yoke 109 and placed opposite to a stator 300 in nearly the same plane via a vibration spring 114 enabling rotational vibration, and mounts a weight 202 eccentric to the rotary shaft so as to greatly generate a vibration acceleration force by a centrifugal force caused on the rotary vibrator 200 on the basis of half-turn vibration. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a speaker and a rotary vibrator which form a multifunctional acoustic device used in a portable device, and is particularly excellent in that the speaker and the rotary vibrator can be simultaneously driven. It is related to the overall structure that can be expected to have excellent acoustic characteristics.

[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. 2 is a sectional view of a conventional example corresponding to an explanatory view of an electromagnetic induction type converter described in Japanese Patent Laid-Open No. 5-85192 (Reference A). FIG. 3 is a half sectional view of a conventional example of a multifunctional device. FIG. 4 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 B). FIG. 5 is a cross-sectional view corresponding to the explanatory view described in the already filed application / Japanese Patent Application No. 2000-286414 by the applicant (Document C). In FIG. 2, 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, and the voice coil 508
The diaphragm 506 and the spring body 511 are vertically opposed to each other at a position where the magnet 510 is inserted, and one end of the magnet 510 has a voice coil 50.
8 is arranged so as to be located in the central portion and is housed in the case 512. By applying a low frequency signal or a high frequency signal to the voice coil 508, the spring body 511 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 FIG. 3, the conventional multifunctional acoustic device is a so-called external magnet type (structure in which a permanent magnet is disposed 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 and a peripheral yoke 60 of a cylindrical top yoke 601 having a semispherical upper surface.
The inner peripheral portion 606a of 6 forms a void 611 that magnetically engages with the voice coil 604. The permanent magnet 602, which is a hollow disk and is magnetized to have a single magnetic pole in the thickness direction, includes the top yoke 6
01, the lower yoke 605, and the outer peripheral portion yoke 606 form a magnetic circuit, and at the same time, the outer peripheral portions of the lower yoke 605 and the outer peripheral portion yoke 606 are formed by the parallel springs 607 and 608.
A permanent magnet body 610 that is fixedly supported by 9 and can vibrate in the vibration direction of the speaker diaphragm 603 is configured.

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 φ20m
In an acoustic device having a size of about m × 5 mm, the permanent magnet body 6 is used.
The resonance frequency of 10 is about 110 to 150 Hz, and the primary resonance frequency of the speaker diaphragm 603 is about 700 to 900.
Hz, the secondary resonance frequency is often 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 6 are used.
Since 10 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 6 are connected.
Coupled vibration occurs at 10. As a result, there is a problem that distortion occurs during reproduction of voice, music, etc., and the quality thereof deteriorates. In addition, since the low frequency vibration is superimposed on the magnetic coupling between the voice coil 604 and the permanent magnet 610, the simultaneous driving of the low frequency vibration and the reproduction of the voice / music, etc. is more significant during the reproduction of the voice / music. It was distorted and virtually impossible.

Document B shown in FIG. 4 is a so-called outer magnet type (structure in which a permanent magnet is arranged outside the voice coil). The same reference numerals as those in FIG. 3 will be used. A voice having a concentric cylindrical shape 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 formed 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 top yoke 601 and the inner peripheral portion 606a of the side yoke 606, each of which has a semi-spherical upper surface and a cylindrical shape, are formed on the voice coil 60.
A first air gap 701 that magnetically engages with 4. The hollow disk-shaped permanent magnet 702 forms a magnetic circuit having the second gap 705 with the top yoke 601, the outer peripheral portion 703a of the lower yoke 703, and the inner peripheral portion 606a of the side yoke 606, and at the same time, the parallel springs 707 and 708 are formed. The lower yoke 703 and the outer peripheral portion 606b of the outer peripheral yoke 606 are fixedly supported by the frame 609 to form a permanent magnet body 610 that can vibrate in the vibration direction of the speaker diaphragm 603. In the second space 705, a concentric cylindrical drive coil 706 fixed to the frame 609 and having input terminals 704a and 704b is arranged. Although the voice coil 604 and the permanent magnet body 610 in the first gap 701 can move relative to each other, the relationship between the drive coil 706 and the permanent magnet body 610 in the second gap 705 is relatively large. Only the permanent magnet body 610, not the motion, is moved to the speaker diaphragm 60.
It can move in the same axial direction as 3.

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 φ20m
In an acoustic device having a size of about m × 5 mm, the permanent magnet body 6 is used.
The resonance frequency of 10 is about 110 to 150 Hz, and the primary resonance frequency of the speaker diaphragm 603 is about 700 to 900.
Hz and the secondary resonance frequency are often 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, the document B is superior to the document A, but the input terminal 61
2a, 612b to the high frequency signal, input terminals 704a, 7
When a low-frequency signal is applied to 04b at the same time, the permanent magnet body 610 vibrates at a low frequency, so the first air gap 701
The voice coil 604 at will move relative to
Coupling vibration occurs in the speaker diaphragm 603 and the permanent magnet body 610, and distortion occurs in the reproduction of voice, music, and the like.

The multifunctional acoustic device of Document C shown in FIG.
It is a so-called inner magnet type (structure in which a permanent magnet is arranged inside a voice coil), and is composed of a sounding body 800, a rotor 820, and a stator 830. A concentric cylindrical voice coil 804 is fixed to the central portion of a speaker diaphragm 803 having a corrugated outer peripheral portion 803a and made of a synthetic resin whose central portion is formed into a dome shape. The outer peripheral portion 803a of the speaker diaphragm 803 is fixed to the frame 809 with an adhesive or the like. Hollow cylindrical speaker magnet 8
On top of 05, the top yoke 8 has a semispherical upper surface and a cylindrical shape.
01 is assigned to the outer peripheral portion 801a of the top yoke 801.
And the inner peripheral portion 807a of the side yoke 807 is the voice coil 8
A speaker gap 701 that magnetically engages with 04. An acoustic cover 810 having a plurality of sound output holes is provided on the upper surface of the speaker diaphragm 803. The hollow disk-shaped permanent magnet 802 is fixed to the side yoke 807 arranged on the outer peripheral portion of the lower yoke 808, and has a stator 830 having a stator side portion 830a accommodated in the bottom surface of the frame 809.
And a motor gap 835. The rotor shaft 806 having the enlarged diameter portion 806a fixed to the center of the bottom surface of the frame 809 is the rotor 8 on which the weight 822 is mounted.
The washer 807 supports the axial direction of 20 and the rotational direction. Then, the stator input terminals 805a, 8
Stator 8 around which stator winding 836 with 05b is wound
In the embodiment of the present invention, reference numeral 30 denotes an upper stator yoke 831, an upper shading plate 832, a lower stator yoke 833, a lower shading plate 83.
4 and the magnetic poles of the stator upper yoke 831 and the stator lower yoke 8
Although it is formed of 33 magnetic poles, the detailed description is omitted because it is a normal configuration.

An input terminal 812 of a lead wire of a voice coil 804 drawn so as to crawl on a speaker diaphragm 803.
When an AC voltage is applied to a and 812b, a current flows through the voice coil 804 and the speaker diaphragm 803 vibrates in the Y direction to generate sound pressure. At this time, standard φ20m
In an acoustic device having a size of about m × 5 mm, the primary resonance frequency of the speaker diaphragm 803 is approximately 700 to 900 Hz,
The secondary resonance frequency is often set to 5 kHz. The reproduction of voice and music is performed in the band of 700 to 5 kHz, but since the vibration of the speaker diaphragm 803 and the rotating direction of the rotor 820 are different by 90 degrees, there is no vibration that couples with each other and the sounding body 800 and the rotor 820 are simultaneously generated. Can be driven. Although Document C is superior to Document A, a switching circuit is required for driving the motor, and there are problems in its arrangement and cost.

Further, Japanese Laid-Open Patent Publication No. 5-305270 (Document D) is known as a known technique for detecting vibration by half-rotation vibration (reciprocating vibration of a rotation angle) of a rotary oscillator. However, Document D does not propose a configuration related to a multifunctional audio device with a speaker.

[0012]

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. Furthermore, there is a demand for a multifunctional acoustic device that can further reduce the cost, and the present invention seeks to meet this.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to realize a multifunctional acoustic device with a simple structure. In particular, low-frequency vibration is composed of a rotary vibrator. It is characterized by this. 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 an audio device, a rotary oscillator provided with a multi-pole permanent magnet on an outer peripheral portion of a magnetic circuit formed by a yoke and a permanent magnet that is magnetically engaged with the voice coil is provided with a spring that enables rotational vibration. And a weight is mounted on the rotary oscillator so as to generate a large vibration excitation force by a centrifugal force generated by half-rotational vibration. To do.

A second aspect of the multifunctional acoustic device of the present invention made to solve the problem is to provide a concentric cylindrical voice coil fixed to a speaker diaphragm and a magnetic field which magnetically engages with the voice coil. In a sound device including a circuit, a cylindrical speaker magnet magnetized into a single magnetic pole in a thickness direction that magnetically engages with the voice coil at a central portion of a frame, and an outer peripheral portion of the voice coil on the speaker magnet. An outer peripheral portion of the cup-shaped yoke supported by a bearing is fixed to a central portion of a cup-shaped speaker yoke made of a magnetic material, and a cylindrical top yoke made of a magnetic material that forms a space that engages with the inner peripheral portion. In addition, a rotary oscillator provided with a multi-pole permanent magnet is provided to face the stator provided on the inner peripheral portion of the frame via a spring capable of rotational vibration, and the rotary oscillator is provided on the rotary oscillator. By half rotation vibration It is characterized in that the vibrating pressure Shinryoku by Jill centrifugal force is disposed so as to Katatsumu by decentering a weight to generate large.

A multifunctional acoustic device according to a third aspect of the present invention, which has been made in order to solve the above-mentioned problems, has a rotary oscillator having a cylindrical rotor yoke and a cylindrical permanent magnet having a multi-pole magnetized outer periphery. It is characterized in that it is mounted and formed, and half-rotation vibration is possible with respect to the stator with the speaker yoke as a rotation axis.

According to a fourth aspect of the multifunctional acoustic device of the present invention made to solve the problem, a rotary oscillator according to the fourth aspect is configured such that a member having a large specific gravity is rotated on either the upper or lower surface of the rotor permanent magnet. 4. The eccentric arrangement with respect to the axis of the rotary oscillator so as to form a single weight in which a vibrating vibration force is largely generated by a centrifugal force generated by the vibration. The multifunctional audio device described.

The multifunctional acoustic device of the present invention made to solve the problems is characterized in that the number of pole pairs of the rotary vibrator is at least 1 or more.

According to a sixth aspect of the multifunctional acoustic device of the present invention made to solve the problem, the rotary oscillator has a spring having one end fixed to the frame and the other end connected to the rotary oscillator. It is characterized by that.

According to a seventh aspect of the multifunctional acoustic device of the present invention made to solve the problems, a stator is made of a magnetic material having a hollow disk shape, and the inner peripheral portion is bent in a sawtooth shape to have a plurality of poles. The stator upper yoke having the stator magnetic poles formed therein, and the stator lower yoke having a plurality of stator magnetic poles formed by bending the inner peripheral portion of the hollow disk-shaped magnetic material into a sawtooth shape, are wound a plurality of times. A multi-pole stator in which a hollow disk-shaped stator winding made of magnet wire is arranged and sandwiched so that the magnetic pole formed by the upper yoke of the stator and the magnetic pole formed by the lower yoke of the stator are adjacent to each other. It is characterized by that.

In the stator according to claim 8 of the multifunctional acoustic device of the present invention made to solve the problem, the number of upper and lower pole teeth of a pair of stators is set to be twice the number of rotor poles. It is characterized by.

In the stator according to claim 9 of the multifunctional acoustic device of the present invention made to solve the problems, a pair of stator magnetic poles is inserted into a pair of disc-shaped shading plates made of a conductive material. It is characterized by using a multi-pole stator.

According to a tenth aspect of the present invention, there is provided a multifunctional acoustic device of the present invention, wherein the driving circuit of the rotary vibrator according to the tenth aspect is driven by a bipolar driving circuit upon receiving an excitation signal of 100 Hz or more. It is what

A driving circuit for a rotary vibrator according to claim 11 of a multifunctional acoustic device of the present invention made to solve the problems is characterized in that it is driven unipolarly by receiving an excitation signal of 100 Hz or more. Is.

According to a twelfth aspect of the present invention, there is provided a driving circuit for a multifunctional audio apparatus according to the present invention, wherein the speaker diaphragm is excited by a wideband signal and a bipolar driving circuit receives an excitation signal of 100 Hz or more. Alternatively, it is characterized in that the rotor is simultaneously driven by a unipolar drive circuit.

[0025]

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

Referring to FIG. 1, a multifunctional acoustic device of the present invention comprises a sounding body 100, a rotary oscillator 200, and a stator 300.
Composed of and. A cup-shaped speaker yoke composed of a lower yoke 108 and a side yoke 109 made of a magnetic material is formed in the center of a cup-shaped frame 111 made of resin or the like, and a disk-shaped top yoke is formed in the center of the speaker yoke. The sounding body 100 in which the speaker magnet 105 having the 104 mounted thereon is fixed to form the cylindrical speaker gap 103 is
A speaker diaphragm having a concentric cylindrical voice coil 102 having voice coil input terminals 112a and 112b, which can be operated in a speaker space 103 described later, is fixed to a speaker diaphragm 101 having a dome 101a formed in the central portion and made of synthetic resin. The outer peripheral portion 101b is fixed to the frame 111 with an adhesive or the like. An outer circumference of an acoustic cover 110 having a plurality of sound output holes is fixed to an outer end of a frame 111 on the upper surface of the speaker diaphragm 101. The speaker air gap 103 magnetically engaged with the voice coil 102 includes a rotor upper yoke inner peripheral portion 112 formed on the top yoke outer peripheral portion 104 a of the top yoke 104 and the side yoke 109.
It is formed by and.

The rotary oscillator 200 is constructed by mounting a multi-pole magnetized cylindrical rotary oscillator permanent magnet 201 on the outer periphery of a cylindrical side yoke 109 made of a magnetic material.
The enlarged diameter portion 1 fixed to the center of the bottom surface of the frame 111
The rotor shaft 106 having 06a carries out axial support of the rotary oscillator 200 carrying the weight 202 by means of the washer 107, and at the same time supports in the rotational direction. Rotating oscillator 200
Has one end fixed to a pin-shaped spring retainer 113 fixed to the bottom of the frame 111, and the other end fixed to the rotary oscillator 200.
It is held by a spiral vibration spring 114 (a plurality of spiral spiral cross sections are shown in the figure) fixed to a spring ring 115 fixed to the. Therefore, the multifunctional acoustic device of the present invention has a natural frequency determined by the stiffness of the vibration spring 114 and the moment of inertia of the rotary vibrator 200. In the embodiment of the present invention, the stator 300 having the stator side portion 303a housed in the bottom of the frame 111 is the stator upper yoke 301, the upper shading plate 302,
The stator lower yoke 303, the lower rake plate 304, the magnetic poles of the stator upper yoke 301, and the magnetic poles of the stator lower yoke 303 have a normal configuration, and therefore detailed description thereof will be omitted. The number of poles of the rotary oscillator 200 and the stator input terminal 305
The number of spiders (the number of poles) of the stator 300 around which the stator winding 306 having a and 305b is wound may be appropriately set depending on the vibration angle and the vibration frequency of the rotary vibrator 200.

In the embodiment of the present invention, the speaker magnet 105 is used.
Is supplied to the speaker gap 103, and a necessary magnetic flux density is supplied by appropriate design. 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]).

Further, in the embodiment of the present invention, the magnetomotive force of the rotor permanent magnet 201 is supplied to the motor gap 203, and the necessary magnetic flux density is supplied by appropriate design. For example, bond ferrite magnet or bond NdFe
B system magnets are selected according to the required specifications.

Next, the operation of the multifunctional audio device of the present invention will be described. First, the voice coil input terminals 112a, 11
When a so-called high-frequency signal in a wide band is applied to 2b by itself, the voice coil 10 in the speaker gap 103
A force acts on Y 2 in the Y direction, the speaker diaphragm 101 of the sounding body 100 vibrates in the Y direction to generate sound pressure, and emits sound waves through the sound output holes of the acoustic cover 110.

Input terminals 305a, 3 of the stator winding 306
When a low frequency signal of about 100 to 300 Hz is input to 05b, an alternating current flows through the stator winding 306. As a result, the rotary oscillator 200 is drawn into the rotary oscillator 200 and generates rotary vibration determined by the drive frequency. At this time, the rotary oscillator 2
If the weight 202 of 00 is M, the angular amplitude is A, the angular frequency of the rotary oscillator 200 is ω [rad / sec], and the radius of gyration is R, the centrifugal force F is naturally expressed by the following equation, and therefore the centrifugal force F is naturally Is set to be as large as possible.

F = RAω ² M [N] ………… (1)

A so-called high-frequency signal having a wide band is applied to the input terminals 112a and 112b of the voice coil 102 of the multifunctional audio apparatus of the present invention, and the input terminals 305a and 305b of the stator winding 306 have a low frequency of about 100 Hz or more. When the signals are simultaneously applied to the rotary oscillator drive circuit, the magnetic flux density in the speaker gap 103 hardly changes even if the rotary oscillator 200 vibrates at the natural frequency, so that the sounding body 10 is generated.
The sound pressure generated by 0 is almost the same as when the rotary oscillator 200 is not vibrating, and the sound quality is not deteriorated.

Further, in the embodiment of the multifunctional acoustic device of the present invention, the low frequency drive circuit may be driven by a bipolar drive circuit, or the stator winding 306 may be driven by a unipolar drive circuit as a double winding with a center tap. It is clear that you can do it.

Further, in the embodiment of the multifunctional acoustic device of the present invention, it is possible that the permanent magnets on the rotary oscillator are arranged slightly eccentrically outside the eccentric weight to enhance the vibration exciting force. it is obvious.

[0036]

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 apparatus of the present invention, it is possible to reliably obtain low-frequency vibration having a large sensational vibration force due to a low-frequency signal with a simple structure.

Further, according to the multifunctional audio apparatus of the present invention, it is possible to drive a high frequency signal and a low frequency signal at the same time, and to realize a sounding body excellent in cost and performance without deterioration of sound quality. You can

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, a certain thickness of the device is required. However, according to the multifunctional acoustic device of the present invention, the low-frequency vibration is low. Is generated in the rotation direction, the magnetic circuit of the speaker magnet and the rotor can be arranged almost in the same plane for the purpose of reducing the thickness of the multifunctional acoustic device, which contributes to downsizing and thinning of portable devices. .

[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 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. 3 is a half sectional view of a conventional example of a multifunctional device.

FIG. 4 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.

FIG. 5 is a cross-sectional view corresponding to the explanatory view described in the already filed application / Japanese Patent Application No. 2000-286414 by the applicant of the present application.

[Explanation of symbols]

100 pronunciation bodies 101 speaker diaphragm 101a dome 101b Speaker diaphragm outer peripheral part 102 voice coil 103 speaker void 104 Top York 104a outer periphery of top yoke 105 speaker magnet 106a, 106b Ceramic ball 108 Lower yoke 110 acoustic cover 111 frames 112a Voice coil input terminal 112b Voice coil input terminal 113 Spring restraint 114 Vibration spring 115 spring ring 200 rotation oscillator 201 Rotating oscillator Permanent magnet 202 weight 203 Motor gap 300 stator 301 Upper stator yoke 302 Upper Kuma plate 303 Lower stator yoke 303a Stator side part 304 Lower Kuma Plate 305a Stator input terminal 305b Stator input terminal 306 Stator winding

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04R 9/02 H04R 9/02 102Z 9/04 105 9/04 105A 9/06 9/06 A 9/10 9/10 F term (reference) 5D012 BB03 BB04 CA03 DA04 GA04 5D017 AA11 5D107 AA08 AA13 AA16 BB08 CC09 DD03 DD09 DE01 FF03 FF07 5H633 BB02 BB03 GG03 GG06 HH02 HH03 JA02 JB09

Claims (12)

[Claims] 1. An audio device comprising a concentric cylindrical voice coil fixed to a speaker diaphragm and a magnetic circuit magnetically engaging with the voice coil, wherein the audio device is provided so as to magnetically engage with the voice coil. A rotary oscillator, in which a multi-pole permanent magnet is provided on the outer peripheral portion of the magnetic circuit formed by the yoke and the permanent magnet, is arranged to face the stator in substantially the same plane through a spring that enables rotational vibration. A multifunctional acoustic device, in which a weight is mounted on the rotary oscillator so that a large vibration vibration force is generated by a centrifugal force generated by the rotational vibration. 2. An audio device comprising a concentric cylindrical voice coil fixed to a speaker diaphragm and a magnetic circuit magnetically engaged with the voice coil, wherein the voice coil is magnetically connected to the center of the frame. A cylindrical speaker magnet magnetized with a single magnetic pole in the thickness direction, and a cylindrical top yoke made of a magnetic material forming an air gap on the speaker magnet whose outer peripheral portion engages with the inner peripheral portion of the voice coil. Is fixed to the central portion of a cup-shaped speaker yoke made of a magnetic material, and a rotary oscillator in which a multi-pole permanent magnet is arranged on the outer peripheral portion of the cup-shaped yoke supported by a bearing is capable of rotational vibration. Is placed so as to face the stator provided on the inner peripheral portion of the frame via the rotor, and the weight is eccentric so that a large vibration vibration force is generated by the centrifugal force generated by the rotational vibration on the rotary vibrator. Piece Multifunction acoustic device according to claim 1, characterized in that arranged so that. 3. The rotary vibrator of the multifunctional acoustic device comprises:
A cylindrical rotary oscillator is formed by mounting a cylindrical permanent magnet that is magnetized in multiple poles on the outer circumference of the yoke, and is capable of rotational vibration with respect to the stator with the speaker yoke as a rotor shaft. The multifunctional acoustic device according to claim 1 or 2, which is configured. 4. The rotor of the multifunctional acoustic device is configured such that a member having a large specific gravity is provided on one of the upper and lower surfaces of the rotary oscillator permanent magnet, and a large vibration vibration force is generated by a centrifugal force generated by rotational vibration. The multifunctional acoustic device according to any one of claims 1 to 3, wherein the multifunctional acoustic device is arranged eccentrically with respect to the rotary oscillator axis so as to form a single weight. 5. The multifunctional acoustic device according to claim 1, wherein the number of pole pairs of the rotary vibrator of the multifunctional acoustic device is at least one or more. 6. The rotary vibrator of the multifunctional acoustic device comprises:
The multifunctional acoustic device according to claim 1, wherein one end is fixed to the frame, and the other end has a spring connected to a rotary oscillator. 7. The stator of the multifunctional acoustic device comprises a stator upper yoke formed of a magnetic material in the shape of a hollow disk, the inner peripheral portion of which is bent in a sawtooth shape to form a plurality of stator magnetic poles, and a hollow. Hollow disk-shaped stator winding consisting of a plurality of wound magnet wires with a stator lower yoke that is made of a disk-shaped magnetic material and is bent into a sawtooth shape on the inner circumference to form a plurality of stator magnetic poles. 4. The multipole stator is characterized in that the magnetic poles formed by the upper yoke of the stator and the magnetic poles formed by the lower yoke of the stator are arranged so as to be adjacent to each other and sandwiched therebetween to form a multipole stator. 6. The multifunctional acoustic device according to any one of 6. 8. The stator of the multi-function audio apparatus according to claim 1, wherein the number of upper and lower pole teeth of the pair of stators is twice the number of rotor poles. A multifunctional acoustic device according to claim 2. 9. The stator of the multifunctional audio device is a multi-pole stator in which a pair of stator magnetic poles are inserted into a pair of disc-shaped shading plates made of a conductive material. The multifunctional acoustic device according to any one of claims 1 to 8. 10. The driving circuit for a rotary vibrator of the multifunctional audio device is driven by a bipolar driving circuit in response to an excitation signal of 100 Hz or higher. The multifunctional audio device described. 11. The driving circuit for a rotary vibrator of the multifunctional audio device is unipolarly driven by receiving an excitation signal having an excitation frequency of 100 Hz or higher. The multifunctional audio device described. 12. The drive circuit of the multifunctional audio device comprises:
Excitation of the speaker diaphragm by a wideband signal,
12. The multifunctional acoustic device according to claim 1, wherein the rotary oscillator is simultaneously driven by a bipolar drive circuit or a unipolar drive circuit in response to an excitation signal of Hz or higher.