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DESCRIPTION JP2002165290

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DESCRIPTION JP2002165290
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
construction of a speaker and a vibration motor which form a multi-functional acoustic device
used in portable equipment, and in particular, an excellent sound capable of simultaneously
driving the speaker and the vibration motor It relates to the overall configuration where
characteristics can be expected.
[0002]
2. Description of the Related Art Conventionally, portable devices such as PHSs and mobile
phones are received by the vibration of a vibration motor, not by the sound produced by the
received sound, so as not to disturb the quiet environment at the reception of a concert hall or
hospital In many cases, a vibration motor is installed to make it possible for the user of the
portable device to sense. On the other hand, not only the reception of the received sound is
required, but also a speaker having better acoustic characteristics is required. For this reason,
conventionally, two vibration motors and two speakers are often attached to a portable device,
space efficiency is deteriorated, and it is difficult to reduce the size, weight and cost of the
portable device. In order to improve this, recently, in addition to the vibration of the diaphragm
of the speaker, a permanent magnet, which is magnetically engaged with the voice coil on the
diaphragm of the speaker, is spring-fixed to the frame. The so-called multi-function device has
been announced that can be driven independently at low frequencies and vibrate in the same
direction as the speaker diaphragm. Hereinafter, representative conventional examples of socalled multifunction devices will be listed and described in detail.
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[0003]
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 (Document A). FIG. 7
is a cross-sectional view of a conventional example of a multifunctional device. FIG. 8 is a crosssectional view corresponding to the explanatory view described in the Patent Application
Publication No. 2000-121852 filed by the applicant of the present application (Document B). In
FIG. 6, the electromagnetic induction transducer is a so-called internal magnet type (a structure
in which a permanent magnet is disposed inside a 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 diaphragm 506 and the spring body 511 are vertically opposed
to a position where the magnet 510 is inserted into the voice coil 508, and the end face of one
pole of the magnet 510 is a voice coil It arrange | positions so that it may be located in 508
center part, and it accommodates in case 512, and is comprised. The spring body 511 is vibrated
in the pole direction of the magnet 510 by applying a low frequency signal or a high frequency
signal to the voice coil 508.
[0004]
In Document A, the diaphragm 506 and the spring body 511 are configured to move relative to
each other through the magnetic coupling between the voice coil 508 and the magnet 510.
Therefore, when a low frequency signal or a high frequency signal is applied to the voice coil
508, the diaphragm 506 is The coupled vibration occurs in the spring body 511. As a result,
there is a problem that distortion occurs at the time of reproduction of voice, music, etc. and the
quality thereof is deteriorated. In addition, simultaneously driving the reproduction of voice and
music and low frequency vibration causes low frequency vibration to be superimposed on the
magnetic coupling between the voice coil 508 and the magnet 510, so that large distortion is
caused at the time of voice and music reproduction. Was virtually impossible.
[0005]
In FIG. 7, the multifunctional acoustic device of the conventional example is a so-called external
magnet type (a structure in which a permanent magnet is disposed outside a voice coil). A
concentric cylindrical voice coil 604 is fixed to a central portion of a speaker diaphragm 603
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having an outer peripheral portion 603a with corrugation and a central portion formed of a
synthetic resin dome-shaped. The outer peripheral portion 603 a of the speaker diaphragm 603
is fixed to the frame 609 with an adhesive or the like. The outer peripheral portion 601 a of the
cylindrical top yoke 601 and the inner peripheral portion 606 a of the outer peripheral portion
yoke 606 of the hemispherical top surface form an air gap 611 magnetically engaged with the
voice coil 604. The permanent magnet 602 which is hollow disk-shaped and magnetized to a
single magnetic pole in the thickness direction forms a magnetic circuit by the top yoke 601, the
lower yoke 605 and the outer peripheral yoke 606, and at the same time, the lower spring 605
by the parallel springs 607, 608 An outer peripheral portion of the part yoke 606 is fixed to and
supported by the frame 609 to constitute a permanent magnet 610 capable of vibrating in the
vibration direction of the speaker diaphragm 603.
[0006]
When an AC voltage is applied to the input terminals 612a and 612b of the lead wires of the
voice coil 604 drawn out so as to cover the speaker diaphragm 603, a current flows through the
voice coil 604 and the speaker diaphragm 603 vibrates in the Y direction. Sound pressure is
generated. At this time, the resonance frequency of the permanent magnet body 610 is
approximately 110 to 150 Hz, and the primary resonance frequency of the speaker diaphragm
603 is approximately 700 to 900 Hz, and the secondary resonance in a standard acoustic device
of about 20 mmφ × 5 mm. The frequency is often set around 5 kHz. Although reproduction of
voice and music is performed in a band of 700 to 5 kHz, the speaker diaphragm 603 and the
permanent magnet 610 are configured to move relative to each other through the magnetic
coupling between the voice coil 604 and the permanent magnet 610. When a low frequency
signal or a high frequency signal is applied to the voice coil 604, coupled vibration occurs in the
speaker diaphragm 603 and the permanent magnet 610. As a result, there is a problem that
distortion occurs at the time of reproduction of voice, music, etc. and the quality thereof is
deteriorated. In addition, simultaneously driving the reproduction of voice and music and low
frequency vibration causes low frequency vibration to be superimposed on the magnetic
coupling between the voice coil 604 and the permanent magnet 610. It was distorted and
virtually impossible.
[0007]
Document B shown in FIG. 8 is a so-called external magnet type (a structure in which a
permanent magnet is disposed on the outside of a voice coil). Describing in common using FIG. 7
and the same reference numerals, a concentric cylindrical voice is provided at the center of a
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speaker diaphragm 603 made of a synthetic resin having an outer peripheral part 603 a with
corrugation and the center formed in a dome shape. The coil 604 is fixed. The outer peripheral
portion 603 a 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 outer peripheral portion yoke 606 having a hemispherical upper surface and a
cylindrical upper yoke form a first air gap 701 magnetically engaged with the voice coil 604. The
hollow disk-shaped permanent magnet 702 forms a magnetic circuit having a second air 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 outer peripheral yoke 606, and at the same time a parallel spring
707; At 708, the lower yoke 703 and the outer peripheral portion 606b of the outer peripheral
portion yoke 606 are fixedly supported on the frame 609, and constitute a permanent magnet
610 capable of vibrating in the vibration direction of the speaker diaphragm 603. The second air
gap 705 is provided with a concentric cylindrical drive coil 706 fixed to the frame 609 and
having input terminals 704 a and 704 b. The voice coil 604 and the permanent magnet 610 in
the first air gap 701 are capable of relative movement, but the relationship between the drive coil
706 and the permanent magnet 610 in the second air gap 705 is relative. Only the permanent
magnet 610 can move in the same axial direction as the speaker diaphragm 603, not the
movement.
[0008]
When an AC voltage is applied to the input terminals 612a and 612b of the lead wires of the
voice coil 604 drawn out so as to cover the speaker diaphragm 603, a current flows through the
voice coil 604 and the speaker diaphragm 603 vibrates in the Y direction. Sound pressure is
generated. At this time, the resonance frequency of the permanent magnet body 610 is
approximately 110 to 150 Hz, and the primary resonance frequency of the speaker diaphragm
603 is approximately 700 to 900 Hz, and the secondary resonance in a standard acoustic device
of about 20 mmφ × 5 mm. The frequency is often set to 5 kHz. Although reproduction of voice
and music is performed in a band of 700 to 5 kHz, the speaker diaphragm 603 and the
permanent magnet 610 are configured to move relative to each other through the magnetic
coupling between the voice coil 604 and the permanent magnet 610. When a low frequency
signal or a high frequency signal is applied to the voice coil 604, coupled vibration occurs in the
speaker diaphragm 603 and the permanent magnet 610. 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 between the speaker diaphragm 603 and the permanent magnet 610 for
reproduction of voice and music, etc. Since no coupled vibration occurs, 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 610 is excited and the speaker diaphragm 603 does not operate at
all. In this respect, although the document B is superior to the document A and FIG. 7 of the
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conventional example, when a high frequency signal is simultaneously applied to the input
terminals 612a and 612b and a low frequency signal is simultaneously applied to the input
terminals 704a and 704b, permanent magnets Since the voice coil 604 in the first air gap 701 is
moved relative to the low frequency vibration of 610, coupled vibration occurs in the speaker
diaphragm 603 and the permanent magnet 610, thereby reproducing the voice / music etc.
Distortion occurs in the
[0009]
As is apparent from the above description, in the case of simultaneously exciting a low frequency
signal and a high frequency signal in any prior art, coupling occurs and the quality of speech,
music, etc. is degraded. It was virtually impossible to prevent. This is because both the low
frequency vibration and the high frequency vibration are configured to vibrate in the same
direction as the speaker diaphragm.
[0010]
SUMMARY OF THE INVENTION An object of the present invention is to realize a multifunctional
acoustic device with a simple configuration by removing defects on the boat, and in particular, a
permanent system in which low frequency vibration is constituted by a rotor. It is characterized
in that it is realized by the rotational movement of the magnet body. Claim 1 of the
multifunctional acoustic device according to the present invention made to solve the problem
comprises a concentric cylindrical voice coil fixed to a speaker diaphragm and a magnetic circuit
magnetically engaged with the voice coil. In an acoustic device, a cylindrical air gap on a rotor
guided by a permanent magnet provided so as to magnetically engage with the voice coil and a
rotor permanent magnet provided on the inner periphery of the cylindrical air gap A rotor having
a rotor mounted on a rotor bearing provided at the center of the frame so as to generate a large
vibrational oscillating force by a centrifugal force generated as the rotor rotates. is there.
[0011]
In addition, claim 2 of the multifunctional acoustic device of the present invention made to solve
the problem is a concentric cylindrical voice coil fixed to a speaker diaphragm and a magnetic
circuit magnetically engaged with the voice coil. In the acoustic device, a stator is provided at the
center of a frame provided with a rotor bearing at the center, and a magnetic circuit consisting of
at least one or more permanent magnets, wherein the concentric cylindrical shape magnetically
engages with the voice coil And a permanent magnet in which the outer peripheral side is
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magnetically magnetized in a multi-polar manner in a concentric cylindrical shape inside the air
gap, and a disk-shaped rotation at the outer edge of the air gap. The rotor is composed of a child
permanent magnet, and the weight is eccentrically disposed on the rotor so as to generate a large
vibrational vibration force due to the centrifugal force generated by the rotation, and arranged so
as to become a single weight. It is
[0012]
The rotor according to claim 3 of the multifunctional acoustic device of the present invention
made to solve the problem is provided on a flat portion of the outer edge portion of the rotor
yoke mechanically engaged with the rotor shaft. A disk-shaped upper yoke made of a magnetic
material which is hollow disk-shaped and mounted on a permanent magnet magnetized to a
single magnetic pole in the thickness direction and whose inner peripheral portion constitutes an
outer peripheral portion of a gap engaged with the voice coil. Is opposed to and fixed to the side
surface of the rotor yoke made of a magnetic material to form a cylindrical air gap, and the
cylindrical inner peripheral side is magnetized in multiple poles on the inner peripheral surface
of the side surface of the rotor yoke. The present invention is characterized in that the rotor
permanent magnet is provided to be opposed to the outer peripheral portion of the stator
through the motor gap.
[0013]
Further, the rotor according to claim 4 of the multifunctional acoustic device of the present
invention made to solve the problem is a disk-shaped permanent magnet in which the side
surface portion of the rotor yoke is magnetized into a single magnetic pole in the thickness
direction. And the outer peripheral side surface is disposed so as to be a common yoke with a
rotor permanent magnet magnetized in multiple poles.
[0014]
Further, the rotor according to claim 5 of the multifunctional acoustic device of the present
invention made to solve the problem is the hollow disk shaped permanent magnet magnetized in
a single magnetic pole in the thickness direction or a multipolar outer peripheral side surface.
Eccentrically with respect to the rotor shaft such that one of the hollow cylindrical rotor
permanent magnets that are magnetized in one side is a single weight so that the vibrational
vibration force is generated largely by the centrifugal force generated by the rotation It is
characterized in that it is disposed.
[0015]
The rotor according to claim 6 of the multifunctional acoustic device of the present invention,
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which was made to solve the problems, has the hollow disk-shaped permanent member so that a
large vibrational vibrational force is generated by the centrifugal force generated by the rotation.
Preferably, a weight having a large specific gravity is disposed eccentrically with respect to the
rotor shaft so as to form a single weight on the outer peripheral portion of the magnet.
[0016]
The pole pair number of the rotor according to claim 7 of the multifunctional acoustic device of
the present invention made to solve the problem is characterized by at least one or more.
[0017]
The stator according to claim 8 of the multifunctional acoustic device of the present invention
made to solve the problem is a disc-shaped magnetic material, and the inner peripheral portion is
bent in a sawtooth shape to provide stator poles of a plurality of poles. A hollow disc-like
structure in which a plurality of windings are formed by a stator upper yoke forming the above
and a stator lower yoke made of a disc-shaped magnetic material and having a plurality of stator
poles formed by bending the inner peripheral portion into a sawtooth shape. The multi-pole
stator is formed by arranging and sandwiching the stator winding composed of the magnet wire
of the magnetic pole formed by the stator upper yoke and the magnetic pole formed by the stator
lower yoke next to each other. It is a feature.
[0018]
The stator according to claim 9 of the multifunctional acoustic device of the present invention
made to solve the problem is characterized in that the number of upper and lower magnetic
poles of the pair of stators is twice the number of rotor poles. It is
[0019]
Further, the stator according to claim 10 of the multifunctional acoustic device of the present
invention made to solve the problem is a half of the number of upper and lower magnetic poles
of the pair of stators on a trimming plate made of a pair of disc-shaped conductive materials. Is
inserted to make a multipole stator.
[0020]
Further, the drive circuit of the rotor according to claim 11 of the multifunctional acoustic device
of the present invention made to solve the problem is characterized in that it is driven by a
bipolar drive circuit in response to an excitation signal of 100 Hz or more. It is.
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[0021]
In addition, the drive circuit of the rotor according to claim 12 of the multifunctional acoustic
device of the present invention made to solve the problem continuously or intermittently
increases the excitation frequency and drives with an excitation signal of 100 Hz or more. It is
characterized by
[0022]
Furthermore, the drive circuit of the rotor according to claim 13 of the multifunctional acoustic
device of the present invention made to solve the problem receives excitation by the broadband
signal of the speaker diaphragm and an excitation signal of 100 Hz or more. The present
invention is characterized in that the rotor is simultaneously driven by a bipolar drive circuit.
[0023]
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 an essential part of an embodiment of a multifunctional
acoustic device according to the present invention.
FIG. 2 is a cross-sectional view taken along line XX of FIG.
FIG. 3 is an exploded perspective view of a rotor of the multifunctional acoustic device according
to the present invention.
FIG. 4 is an exploded perspective view of a stator of the multifunctional acoustic device of the
present invention.
[0024]
In FIGS. 1, 2, 3 and 4, the multifunctional acoustic device of the present invention is composed of
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a sound generator 100, a rotor 200 and a stator 300.
Supported on a bearing boss 307 having an impregnated material impregnated with a lubricant
that sandwiches a pair of upper and lower bearings 308, 309 disposed at the central part of a
cup-shaped frame 111 formed of resin etc. The sounding body 100 to which the rotor shaft 106
to which the ring 104 is press-fitted is fixed is a concentric cylindrical shape that can operate
within the speaker gap 103 described later on the speaker diaphragm 101 having a dome 101a
at the center part made of synthetic resin. The voice coil 102 is fixed, and the speaker diaphragm
outer peripheral portion 101 b is configured to be fixed to the frame 111 with an adhesive or the
like.
The outer periphery of an acoustic cover 110 having a plurality of sound output holes is fixed to
the outer end of the frame 111 on the upper surface of the speaker diaphragm 101.
The rotor 200 mechanically engaged with the rotor shaft 106 and rotatable via the washer 107
has a cup-like flat portion 202a of the rotor yoke 202 having a flat portion at the outer edge, the
upper and lower surfaces in the thickness direction The inner peripheral portion of the diskshaped upper yoke 108 mounted on the disk-shaped speaker magnet 105 in which the single
magnetic pole is magnetized forms the inner peripheral portion of the speaker gap 103 engaged
with the voice coil 102. A rotor which is disposed to face the outer peripheral side surface of a
rotor yoke 202 made of a magnetic material to constitute a speaker air gap 103, and the inner
peripheral side surface of the rotor yoke 202 is magnetized with multiple poles on the inner
peripheral side surface. The permanent magnet 201 is disposed to face the stator 300 via the
cylindrical motor gap 203.
[0025]
The permanent magnet mounted on the rotor 200 is the speaker magnet 105 and the rotor
permanent magnet 201, and there are two circuits of magnetic circuits, one of which is the
speaker magnet 105, the inner peripheral portion 108a of the upper yoke 108, the speaker gap
And 103, the rotor yoke outer peripheral portion 201a of the rotor yoke 202.
In another magnetic circuit, the magnetic flux produced by the multipole-magnetized magnetic
pole on the outer peripheral surface of the rotor permanent magnet 201 is formed via a motor
gap 203 between the rotor yoke 202 and a stator magnetic pole described later. Be done.
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The material of the rotor permanent magnet 201 may be selected in accordance with required
specifications such as bond ferrite and bond NdFeB.
Further, although the number of poles is eight in the embodiment, the number of poles is 2 or
more, and the width of the yoke and the magnetic pole may be an appropriate value in design.
A weight formed of a resin filled with a material having a large specific gravity in a semicircular
shape, for example, tungsten fine powder, on the upper surface of the outer periphery of the
speaker magnet 105 in order to increase vibrational vibration due to centrifugal force generated
when the rotor 200 rotates. Secure 204.
Further, the speaker magnet 105 and the rotor permanent magnet 201 may be slightly
eccentrically fixed.
[0026]
The stator 300 facing the rotor 200 through the yoke gap 203 includes a plurality of stator
windings 306 wound concentrically in a cylindrical shape, a pair of upper stator yokes 301, a
lower stator yoke 303, and a pair of stator windings. It is constituted so that it may be
surrounded by the upper cover plate 302 and the lower cover plate 304. The disk upper stator
yoke 301 made of a magnetic material has four main magnetic poles 301a1, 301b1, 301c1,
301d1 and four auxiliary magnetic poles 301a2, 301b2 which are bent in a sawtooth shape with
respect to the inner peripheral portion of the stator. 301c2 and 301d2 in total including eight
magnetic poles and made of a magnetic material and having a disc-like stator lower yoke 303 has
four main magnetic poles 303a1 and 303b1 which are bent in a sawtooth shape with respect to
the inner peripheral portion of the stator. , 303c1 and 303d1 and four supplementary magnetic
poles 303a2, 303b2, 303c2 and 303d2 in total: eight poles in total, vertically adjacent to each
other (main magnetic pole 301a1, complementary magnetic pole 301a2), (main magnetic pole
303a1, auxiliary magnetic pole 303a2), (main magnetic pole 301b1, auxiliary magnetic pole
301b2), (main magnetic pole 303b1, auxiliary magnetic pole 303b2), (main magnetic pole
301c1) Auxiliary magnetic pole 301c2), (main magnetic pole 303c1, auxiliary magnetic pole
303c2), (main magnetic pole 301d1, auxiliary magnetic pole 301d2), (main magnetic pole
303d1, auxiliary magnetic pole 303d2) has one magnetic pole pitch, that is, 90 ° in mechanical
angle (360 ° in electrical angle) ) Spaced apart. The total of the main pole width and the
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complementary pole width is within 45 ° in mechanical angle, and the main pole width is
formed wider than the complementary pole width.
[0027]
In FIG. 4, the stator supplementary magnetic poles 301 a 2, 301 b 2, 301 c 2 and 301 d 2 of the
stator upper yoke 301 are inserted into the upper ridge removal ring holes 302 a, 302 b, 302 c
and 302 d of the upper ridge removal plate 302, respectively. Disposed on a stator winding 306
having 305b. The stator supplementary magnetic poles 303a2, 303b2, 303c2 and 303d2 of the
stator lower yoke 303 having the stator side portion 303e are respectively inserted into the
lower shielding ring holes 304a, 304b, 304c and 304d of the lower shielding plate 304, and the
stator winding A line 306 is between the stator side portion 303e and the main magnetic pole
row (303a1, auxiliary pole row 303a2), (303b1, auxiliary pole row 303b2), (303c1, auxiliary
pole row 303c2), (303d1, auxiliary pole row 303d2) It is arranged.
[0028]
In the embodiment of the present invention, the magnetomotive force of the speaker magnet 105
is supplied to the speaker gap 103, and the necessary magnetic flux density is supplied by
designing appropriately. In particular, in a sintered NdFeB-based magnet having an energy
product of 360 to 400 [J / m 3] (45 to 50 [MGOe]) as in recent years, 0.4 to 0.6 [T] (4 to 6 [kG ]
Can be supplied.
[0029]
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 designing appropriately. For example, a bonded ferrite magnet or a bonded
NdFeB magnet is selected according to the required specifications.
[0030]
The rotor 200 and the stator 300 according to the embodiment of the present invention, as
apparent from the description, constitute a synchronous motor having a permanent magnet
multipole rotor, and can also be used as a stepping motor.
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[0031]
Referring to FIG. 5, a rotor drive circuit 400 showing a bipolar drive circuit is configured to have
a pair of NPN transistors 401, 403 and PNP transistors 402, 404 in a state of anonymity.
A stator winding 306 is connected between the emitters of the transistors 401 and 402 and the
emitters of the transistors 403 and 404. An inverter 407 is interposed between the bases of the
transistors 401 and 402 and the bases of the transistors 403 and 404. Connected to form an
input connection point 409 and to constitute an input terminal 408. The power supply voltage
405 is connected to the collectors of the transistors 401 and 403, and the ground 406 is
connected to the collectors of the transistors 402 and 404. A low frequency excitation signal 410
of 100 to 300 Hz is applied to the input terminal 408. The operation will be described later.
[0032]
Next, the operation of the multifunctional acoustic device of the present invention will be
described. First, when a wide band so-called high frequency signal alone is applied to the voice
coil input terminals 112a and 112b, a force acts on the voice coil 102 in the speaker gap 103 in
the Y direction, and the speaker diaphragm 101 of the sounding body 100 Vibrates in the Y
direction to generate sound pressure, and emits a sound wave through the sound emission hole
of the sound cover 110.
[0033]
When a low frequency signal of about 100 Hz or more is applied to the stator input terminals
305a and 305b via the terminal holes 109 provided at the bottom of the frame 111, an
alternating current flows in the stator winding 306. As a result, the main magnetic pole row
(301a1, auxiliary magnetic pole row 301a2), (303b1, auxiliary magnetic pole row 303b2),
(301c1, auxiliary magnetic pole row 301c2), (303d1, auxiliary magnetic pole row 303d2) of the
stator 300 is energized, At that time, the magnetic flux generated in the four supplementary
magnetic poles 301a2, 301b2, 301c2 and 301d2 and the four supplementary magnetic poles
303a2, 303b2, 303c2 and 303d2 is lower than the upper shielding ring holes 302a, 302b, 302c
and 302d on the upper shielding plate 302. A phase delay is caused by the eddy current flowing
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back through the lower cover ring holes 304a, 304b, 304c, 304d of the cover plate 304, and an
elliptical magnetic field is generated to generate a rotational force in a predetermined direction.
The rotor 200 is pulled into it and rotates at a rotation speed determined by the drive frequency.
When the pole-pair number of the rotor 200 is P and the drive frequency is f, the rotational
speed N of the rotor 200 is
[0034]
N=60f/P [rpm]………… (1)
[0035]
At this time, the mass of the weight 204 of the rotor 200 is M, the distance from the center of the
rotor shaft 106 to the center of gravity of the weight 204 is R, the radius of the rotor shaft 106 is
r, and the bearings of the rotor shaft 106 and the rotor 200 Assuming that the friction coefficient
between 308 and 309 is μ and the rotation speed of the rotor 200 is ω [rad / sec], the load
torque TL is expressed by the following equation.
[0036]
TL = μrRω2 M [N · m] (2) The rotor 200 only needs to bear the load of the load torque TL
according to the equation (2), so a large motor output is not required.
Therefore, it can be expected that the power consumption will be minimal.
[0037]
Also, in order to make the rotor 200 follow the required drive frequency, the required drive
frequency, for example, starts from the lowest frequency signal at the beginning of the start, for
example 50 Hz, continuously or intermittently. It can be increased to 300 Hz to provide a
vibrational vibration force in the diametrical direction of the rotor 200.
[0038]
A so-called high frequency signal of a wide band is applied to the input terminals 112a and 112b
of the voice coil 102 of the multifunctional acoustic device according to the embodiment of the
present invention, and a low frequency of about 100 Hz or more is applied to the input terminals
305a and 305b of the stator winding 306 When a signal is simultaneously applied, the magnetic
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flux density of the speaker gap 103 hardly changes even if the rotor 200 is rotating at a
synchronous speed, so that the sound pressure generated by the sounding body 100 is not
rotating the rotor 200 The sound quality does not deteriorate with almost no change from time
to time.
[0039]
In the embodiment of the multifunctional acoustic device according to the present invention, the
motor constituted by the rotor 200 and the stator 300 is the synchronous motor, but it is
obvious that other brushed DC motor or brushless motor may be used.
Further, for simplicity, the pole pair number P of the rotor permanent magnet 201 has been
described as P = 4. However, the present invention is not limited to this, and P ≧ 1 can be used.
Further, in the embodiment of the multifunctional acoustic device of the present invention, the
stator 300 is disposed on the outer peripheral portion of the frame 111, but the rotor is on the
outer peripheral portion and the stator is on the rotor shaft 106. It is also possible to use a
synchronous motor to be arranged.
[0040]
Further, in the embodiment of the multifunctional acoustic device according to the present
invention, it is apparent that the permanent magnet on the rotor may be arranged slightly
eccentrically in addition to the eccentric weight to enhance the vibrational vibration force.
[0041]
Further, according to the multifunctional acoustic device of the present invention, it is possible to
faithfully reproduce the broadband signal of the sounding body with a simple configuration.
[0042]
Furthermore, according to the multifunctional acoustic device of the present invention, it is
possible to reliably obtain a low frequency vibration with a high sensitivity to a low-frequency
signal with a simple configuration.
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[0043]
Furthermore, according to the multifunctional acoustic device of the present invention, it is
possible to simultaneously drive high frequency signals and low frequency signals and to realize
a sound generator with excellent cost / performance with no deterioration in sound quality.
[0044]
In the conventional example, the low frequency vibration with large amplitude is in the same
direction as the vibration of the speaker diaphragm, so the thickness of the device is required to
some extent, but according to the multifunctional acoustic device of the present invention, the
low frequency vibration is rotated As a result, the thickness of the multifunctional acoustic device
can be reduced, and the sensational impact is large over a wide range, contributing to the
downsizing and thinning of portable devices.
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