close

Вход

Забыли?

вход по аккаунту

?

JP2003125474

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2003125474
[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. 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 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 time of reception such as 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.
11-05-2019
1
[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 Japanese Patent Laid-Open No. 585192 (Document A). FIG. 7 is a half sectional view of a conventional example of a
multifunctional device (Document B). FIG. 8 is a cross-sectional view corresponding to the
explanatory view described in the previously filed application and patent application No. 2000121852 by the applicant of the present application (Reference C). 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 the 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 Document B, the conventional multifunctional acoustic device is a so-called external magnet
type (a structure in which a permanent magnet is disposed outside a voice coil). A concentric
11-05-2019
2
cylindrical voice coil 604 is fixed to a central portion of a speaker diaphragm 603 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 C shown in FIG. 8 is a so-called external magnet type (a structure in which a
permanent magnet is disposed outside the voice coil). Describing in common using FIG. 7 and the
11-05-2019
3
same reference numerals, a concentric cylindrical voice is provided at the center of a 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 C is superior to the document A and the document B
11-05-2019
4
of the 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]
In recent portable devices, the display area of the liquid crystal panel and the organic EL has
become large and it is easy to look bright, but the storage area of the input / output device of the
acoustic device, that is, the speaker and the microphone tends to be reduced. In order to cope
with such a tendency, in the method of simply reducing the diameter of the circular speaker
according to the prior art, the sound pressure is reduced and the purpose can not be achieved.
None of the above-mentioned documents A, B, and C disclose technical disclosure for meeting
such expectation.
[0010]
As is apparent from the above description, in the case of simultaneously exciting a low frequency
signal and a high frequency signal in any of the prior art, coupling occurs and the quality of
speech and music 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. In addition, downsizing and thinning have not been
sufficiently achieved.
[0011]
SUMMARY OF THE INVENTION An object of the present invention is to realize a multifunctional
acoustic device capable of downsizing and thinning with a simple configuration without a defect
in a boat and having 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 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 the acoustic device, a cylindrical permanent magnet
11-05-2019
5
is disposed on an inner peripheral portion of a cap-like yoke of a magnetic circuit comprising an
external permanent magnet provided so as to magnetically engage with the voice coil, and the
permanent magnet A rotor of a direct current motor is provided opposite to each other with a
gap, and a weight is mounted on the rotor so that a vibrational vibration force is generated
largely by a centrifugal force generated by rotation.
[0012]
According to a second aspect of the present invention, there is provided an acoustic device
comprising a magnetic circuit magnetically engaged with the voice coil, wherein a hollow made
of a magnetic material is formed on a bottom surface of a frame. A plate-shaped outer peripheral
yoke made of a magnetic material is fixed on a speaker magnet fixed to a flat portion of a cap-like
yoke and on the flat portion magnetized in a single magnetic pole in a thickness direction of a
circular or elliptical cross section. The inner circumferential surface of the outer circumferential
yoke and the outer circumferential surface of the cap-like yoke are disposed opposite to each
other with a gap so as to magnetically engage the voice coil, and the inner circumferential side
surface of the cap-like yoke is disposed A cylindrical motor magnet, which is magnetized in a
diametrical direction, is provided, and a rotor shaft for supporting the rotor is fixed to a central
portion of the frame via the motor magnet and an air gap, and is rotated on the rotor Vibration
caused by centrifugal force KaShinryoku is characterized in that arranged so that a Katatsumu by
decentering a weight to generate large.
[0013]
The external shape of the diaphragm shown in claim 3 of the multifunctional acoustic device of
the present invention made to solve the problem is characterized by being circular or elliptical.
[0014]
The external shape of the speaker magnet shown in claim 4 of the multifunctional acoustic
device of the present invention made for the purpose of solving the problem is characterized by
being circular or elliptical.
[0015]
The rotor of a motor according to claim 5 of the multifunctional acoustic device of the present
invention made to solve the problem is made of laminated magnetic materials having a plurality
of slots, and an eccentric weight is mounted on the upper surface A flat plate-like commutator is
disposed on the lower surface, and is configured to be rotatable.
11-05-2019
6
[0016]
The rotor of a motor according to claim 6 of the multifunctional acoustic device of the present
invention made to solve the problem is produced by rotating a member having a large specific
gravity on any of the upper and lower surfaces of the rotor permanent magnet. It is characterized
in that it is disposed eccentrically with respect to the rotor shaft so as to be a single weight so
that a vibrational vibration force is generated largely by a centrifugal force.
[0017]
A pair of brushes of the multifunctional acoustic device according to the present invention made
for solving the problem is fixed to the bottom of the frame, and the tips of the brushes elastically
press the upper surface of the commutator of the rotor. It is characterized in that
[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 cross-sectional view of an essential part of an embodiment of a multifunctional
acoustic device according to the present invention.
FIG. 2 is an exploded perspective view of a motor of the multifunctional acoustic device of the
present invention.
FIG. 3A is a top view of another embodiment of the present invention.
FIG. 3 (B) is a cross-sectional view taken along line XX of FIG. 3 (A).
FIG. 4 (A) is a top view from the cover of FIG. 3 (A).
FIG. 4B is a cross-sectional view taken along line YY of FIG. FIG. 5 is a perspective view of a
speaker magnet of the multifunctional acoustic device of the present invention.
11-05-2019
7
[0019]
In FIG. 1, a multifunctional acoustic device 300 according to 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 a cross section including the major axis is shown. . The rotor shaft
202 for supporting the rotor 201 is fixed to the center bottom portion by the clamp 204, and the
flat portion 105 of the cap-like yoke 103 made of a magnetic material is formed on the outer
peripheral bottom of the cup-shaped frame 108 made of resin. It is fixed. A speaker magnet 109
magnetized in a disk shape and having a single magnetic pole in the axial direction is fixed to the
flat portion 105, and a voice coil 102 fixed to the diaphragm 101 molded of resin or the like on
the speaker magnet 109. An outer peripheral yoke 106 made of a magnetic material is fixed so
as to be able to magnetically engage with it. An inner peripheral side surface 106 a of the outer
peripheral yoke 106 and an outer peripheral side surface 103 a of the cap-like yoke 103 form a
voice coil gap 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 top surface of the speaker diaphragm
101.
[0020]
In FIGS. 1 and 2, a diametrically magnetized motor magnet 207 whose outer periphery is covered
by a cylindrical motor yoke 208 on an inner peripheral side surface 105 of a hollow cap-like
yoke 103 whose central portion is circularly penetrated. It is arranged. If the cap-like yoke 103 is
not magnetically saturated, the motor yoke 208 may be omitted. The rotor 201 having a
cylindrical bearing 203 incorporating a pair of bearings (not shown) is rotatable with respect to
the rotor shaft 202, and the upward impact of the rotor 201 due to vibrational impact is the
rotor shaft. It is prevented by the diameter enlarged part 202 a 202. The rotor 201 is a
commutator having spiders 210a, 210b and 210c and segments 213a, 213b and 213c, in which
magnetic materials are stacked to have slots 211a, 211b and 211c and coils 212a, 212b and
212c are wound respectively. And 214. The rotor 201 is provided with a weight 209 mounted
and fixed at an eccentric position, and a segment of the commutator 214 coaxially attached to
the rotor shaft 202 of the rotor 201, coils 212a, 212b and 212c for 213a 213b, 213c. The
terminals of the winding (not shown) are connected in the same manner as a normal DC motor.
The rotor 201 is disposed on the inner periphery of the motor magnet 207 via the 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 perform electrical The other end is connected to a
pair of motor input terminals 301 and 302 to be connected to an external DC power supply.
11-05-2019
8
[0021]
In FIGS. 3A, 3B, 4A, and 4B, the elliptical multi-function acoustic device 400 determines the outer
shape viewed from the top, and the cross section of the XX line is vertically long and the YY line
The cross section is formed short laterally. A cover 107 having acoustic holes 112a, 112b, 112c,
112d, 112e and 112f is disposed on the upper surface of FIG. 3 (A). The detailed configuration is
described in FIG. 1 and FIG. 2, so the detailed description will be omitted.
[0022]
In FIG. 5, the outer shape of the speaker magnet 109 has a major axis 410 having a major axis
width 413 different in radial length and a minor axis 411 having a minor axis width 414, and the
inner diameter forms a circular diameter 412 . The shape of the speaker magnet 103 is intended
to increase the volume so that the magnetic flux density of the voice coil gap 110 can be
improved and the acoustic coefficient of the speaker 100 can be increased. The external shape of
the speaker magnet 103 is not limited to an ellipse, and may be a rectangular shape, and if the
permanent magnet having a large energy product, for example, BH) m of 50 [MGOe] or more is
used, The outer shape may be circular. In this case, the outer shape of the diaphragm is formed
in an ellipse or a rectangle.
[0023]
In the embodiment of the present invention, the magnetomotive force of the speaker magnet 103
is supplied to the speaker gap 110, 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.
[0024]
Further, in the embodiment of the present invention, the magnetomotive force of the motor
magnet 207 is supplied to the motor gap 215, and the necessary magnetic flux density is
supplied by designing appropriately. For example, a bonded ferrite magnet or a bonded NdFeB
11-05-2019
9
magnet is selected according to the required specifications.
[0025]
Next, the operation of the multifunctional acoustic device of the present invention will be
described. First, when a so-called high frequency signal of a wide band is independently applied
to the voice coil input terminals 112 and 113, a force acts on the voice coil 102 in the voice coil
gap 110 in the Z direction, and 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.
[0026]
When a DC voltage of 3 to 3.6 V is applied to the motor input terminals 301 and 302, the coils
212a to 212C of the rotor 201 are energized and activated via the brushes 205 and 206 and the
commutator 214, and are determined by the design specifications The rotation speed reaches, for
example, 8,000 rpm. At this time, the mass of the weight 209 of the rotor 201 is M, the distance
from the center of the rotor shaft 202 to the center of gravity of the weight 209 is R, the
coefficient of friction with the rotor shaft 202 of the rotor 201 is μ, and Assuming that the
rotational speed is ω [rad / sec] and the radius of the rotor shaft 202 is r, the load torque TL is
expressed by the following equation. TL = μrRω2 M [N · m] (1) The rotor 201 only needs to
bear the load of the load torque TL according to the equation (1), so a large motor output is not
required. Therefore, it can be expected that the power consumption will be minimal.
[0027]
A wide band so-called high frequency signal is applied to the input terminals 112 and 113 of the
voice coil 102 of the multifunctional acoustic device according to the embodiment of the present
invention, and a DC voltage of about 3.0 to 3.6 V is applied to the motor input terminals 301 and
302. When applied simultaneously, since the magnetic flux density of the voice coil gap 110
hardly changes even if the rotor 201 is rotating at a predetermined speed, the sound pressure
generated by the speaker 100 is the same as when the rotor 201 is not rotating. There is almost
no change in the sound quality.
[0028]
According to the present invention, it is possible to easily realize a space-efficient, oval-type
11-05-2019
10
multifunctional acoustic device capable of enlarging the display area of the portable device and
having no dead space on the arrangement like a circular speaker. It is possible to
[0029]
Furthermore, according to the multifunctional acoustic device of the present invention, the
broadband signal of the sounding body can be faithfully reproduced with a simple configuration.
[0030]
Furthermore, according to the multifunctional acoustic device of the present invention, it is
possible to reliably obtain a large low frequency vibration of a body shocking vibration due to a
direct current motor with a simple configuration.
[0031]
Furthermore, according to the multifunctional acoustic device of the present invention, it is
possible to simultaneously drive a speaker drive by a wide band signal and a vibration by a DC
motor, and realize a speaker excellent in cost / performance without deterioration of sound
quality. Can.
[0032]
Furthermore, in the prior art, since the low frequency vibration with large amplitude is in the
same direction as the vibration of the speaker diaphragm, 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 Since the magnetic circuit of the speaker magnet and the
configuration of the motor can be arranged almost on the same plane so as to make the thickness
of the multifunctional acoustic device thinner, the portable device becomes smaller and thinner.
Contribute to
[0033]
Brief description of the drawings
[0034]
1 is a cross-sectional view of the main part of the embodiment of the multifunctional acoustic
device of the present invention.
11-05-2019
11
[0035]
2 is an exploded perspective view of a motor of the multifunctional acoustic device of the present
invention.
[0036]
FIG. 3A is a top view of another embodiment of the present invention.
(B) is a cross-sectional view taken along line XX of (A).
[0037]
FIG. 4 (A) is a top view from the cover of FIG. 3 (A).
FIG. 3B is a cross-sectional view taken along line YY of FIG.
[0038]
5 is a perspective view of the speaker magnet of the multifunctional acoustic device of the
present invention.
[0039]
6 is a cross-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.
[0040]
7 is a half sectional view of a conventional example of the multifunctional device.
[0041]
FIG. 8 is a cross-sectional view corresponding to the explanatory view described in the previously
filed patent application and Japanese Patent Application No. 2000-121852 by the present
applicant.
11-05-2019
12
[0042]
Explanation of sign
[0043]
Reference Signs List 100 speaker 101 speaker diaphragm 102 voice coil 103 cap-shaped yoke
103 a outer peripheral side 104 first flat portion 105 inner peripheral side 106 outer peripheral
yoke 106 a inner peripheral side 107 cover 108 frame 109 speaker magnet 110 voice coil air
gap 112, 113 voice coil input terminal 111a, 111b, 111c, 111d, 111f Acoustic hole 200 Motor
201 Rotor 202 Rotor shaft 202a Diameter expansion portion 205, 206 Brush 207 Motor magnet
208 Motor yoke 209 Weight 210a, 210b, 210c Spider 211a, 211b, 211c Slot 212a, 212b, 212c
Coils 213a, 213b, 213c Segments 214 Commutator 215 Motor gap 300 Multifunctional acoustic
device 301, 302 Motor input terminal 400 Elliptical type Ability acoustic device 410 long axis
411 minor axis 413 Nagajikuhaba 414 the width of the short axis
11-05-2019
13
Документ
Категория
Без категории
Просмотров
0
Размер файла
25 Кб
Теги
jp2003125474
1/--страниц
Пожаловаться на содержимое документа