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JPH01258598

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DESCRIPTION JPH01258598
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic electroacoustic exchanger such as a speaker, a microphone, an earphone, a
telephone, a buzzer and the like, characterized in that it can be formed to be extremely thin,
compact and lightweight. The point is that the coil is fixed and the permanent magnet moves, and
the weight of the movable body can be lightened, as a result, the response speed is improved and
its vibration is converted into sound or current. The efficiency has been increased, low-pitched
sound can be easily generated, and long lead-life products can be expected without lead wires,
and the structure can be simplified to enable mass production at low cost. It is an efficient
electrodynamic electroacoustic exchanger. And, in particular, the feature of the present invention
is the generation of the leakage flux of the permanent magnet without requiring an extra
member for the stator yoke formed at the center of the frame to prevent the generation of the
leakage flux in the radial direction of the permanent magnet. The magnetic flux can be closed as
much as possible to prevent the magnetic flux as much as possible to improve the performance,
and a member that prevents dust from entering between the permanent magnet and the coil for
generating vibrational force Can be formed integrally with the stator yoke so that the dust cap
can be eliminated and the structure can be inexpensive. [Technical background and its problems]
Electrodynamic electroacoustic exchanger 1 For example, a speaker. When a voice coil is
movably disposed in a magnetic field and a voice current flows, the voice coil vibrates as the
current changes. In this case, a speaker that reproduces a sound wave by moving a vibrating
body by a coil is called a dynamic speaker, and a speaker that emits a sound wave by directly
connecting a coil to a cone-like paper is called a dynamic cone speaker, Move a small vibrator
with a voice coil. A microphone, such as a dynamic microphone, is called a dynamic horn
speaker, which emits a sound wave efficiently by attaching a horn on the front surface of the
horn. In the same structure as a dynamic speaker, when the vibration body is moved in response
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to the sound wave, a voice coil attached to it vibrates in a magnetic field to generate an electric
current. Since all of these electrodynamic electroacoustic exchangers have the same structure,
the loudspeaker will be described below. Many conventional dynamic cone speakers 1 are
configured as shown in FIG. That is, a permanent magnet 4 composed of a cylindrical ferrite
magnet on a yoke plate 3 provided with a center ball (central magnetic pole) 2.
Similarly, a cylindrical upper yoke plate 5 is disposed, and these are fixed by an adhesive or the
like to constitute the field portion 6 to constitute the fixed side. Although the field section 6
shown here is called an external magnet type, it may be a white magnet type using a yoke and
incorporating a columnar permanent magnet and a center ball at the center of the inside of the
yoke. . A cone-shaped frame 7 is connected to the field portion 6, and a peripheral portion of a
vibrating body 9 formed of a cone-shaped paper together with a gasket (arrowhead) 8 is made of
an adhesive at the peripheral portion of the frame 7. And so on. At a central portion of the
vibrating body 9, a coil bobbin 11 formed of paper, thin plastic or the like on which a cylindrical
voice coil 10 is wound at the lower portion is coupled. The middle portion of the coil bobbin 11
holds the voice coil 10 at the center between the magnetic poles and is supported by a damper
12 for damping the vibration appropriately, and the voice coil 10 is supported in the magnetic
gap 13 of the field section 6. It is supposed to be positioned correctly. Further, a dust cap 14
such as a dustproof cloth is attached to the upper surface of the central portion of the vibrating
body 9 so that dust in the air does not enter the annular magnetic gap 13. According to such a
conventional speaker 1, a cone-shaped flame-like frame 7 and a vibrating body 9 are formed on
the front surface portion on the sound generation side of the plate yoke 3 forming the magnetic
circuit (field portion 6). In addition, there is a drawback in that it is axially long by at least the
gap length between the frame 7 and the vibrator 9. Since the field portion 6 itself has to be
formed long in the axial direction, it has a drawback that it is very thick and one weight is heavy
and large. Moreover, according to the speaker 1 having such a configuration, the field section 6
is complicated, and a very large permanent magnet 4 is required, the weight is 2 heavy, and the
large permanent magnet 4 is exposed. It has not been sufficient for adoption in various acoustic
devices that generate magnetic flux and dislike the occurrence of the external leakage magnetic
flux. In the case of such a conventional speaker 1, although it is general to cover the whole of the
speaker 1 shown in FIG. 6 with the final frame not shown, in order to form inexpensively, some
devices use such a final frame Also, it may be used built-in. Or, a finished product using such a
final frame may be manufactured elsewhere, etc! & It may be delivered as the speaker 1 without
the end frame. In such a case, the vibrator 9 may be broken during transportation or during use
due to a force applied from the outside due to some external factor.
Moreover, in the case of the conventional speaker 1, since the voice coil 10 drags a lead wire and
vibrates, the lead wire may be cut depending on long-term use. There has been a drawback that
the lead wire may be detached from the solder, possibly resulting in breakage, and the life may
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be shortened. Also, the lead wire 15 of the voice coil 10 has its both terminals pulled out from
the top through the magnetic gap 13 and is led to the vibrating body 9 (or may be the frame 7)
and soldered at that position. {Circle around (2)} By using the voice coil 10 with a limited
thickness in order to pass both terminals of the lead wire 15 of the voice coil 10 into the
magnetic air gap 13. The magnetic flux density in the magnetic air gap 13 can not be increased
by the thickness of the lead wire 15, and the efficiency is low. The same applies to a speaker
having another structure using a piezoelectric element and the like in that dynamic bass can not
be accommodated. ? In order to pass both terminals of the lead wire 15 of the voice coil 10 into
the magnetic gap 13 and since both terminals of the lead wire 15 must be soldered to the
vibrating body 9 etc., mass productivity is not good and expensive. It was supposed to be a thing.
In the case where the vibrating body 9 is formed of a thin film plastic of the present, when the
terminal of the lead wire 15 is soldered to this, the heat at that time makes the hole clear and the
defect rate increases. The body 9 could not be formed, and mass production could not be
performed at low cost. ? Also, since both ends of the lead wire 15 of the voice coil 10 pass
through the magnetic gap 13, there is a possibility that the lead wire 15 comes in sliding contact
with the fixed side when the voice coil 10 vibrates, The failure rate was also very high. Further, in
the case of the conventional speaker 1, since the voice coil 10 vibrates, (1) The specific gravity of
the wire constituting the voice coil 10 (specific gravity of copper is There is a drawback that the
load is large because the weight is about 7.86), the response speed is slow, and the voice signal
can not be extracted more accurately over a wide range. In particular it was not enough to take
out dynamic bass. {Circle over (2)} In order to eliminate any of the above-mentioned drawbacks
due to a very heavy wire for forming the voice coil 10, ie, to prevent the weight of the voice coil
lO from becoming heavy In order to prevent the magnetic flux density in the air gap 13 from
being reduced, the wires must be closely wound in close-packed lines (or referred to as aligned
winding) so that the wires do not overlap. Since the winding of the tightly wound voice coil 10 is
very expensive and requires a high degree of accuracy, the defect rate is high, and it has the
disadvantage of becoming very expensive.
{Circle over (1)} One of the causes of the defects of the above {circle over (1)} and {circle over (2)}
is that the resistance value of the voice coil 10 is determined to be 1 .OMEGA. However,
manufacturing the voice coil 10 in accordance with the resistance value is very troublesome and
has a drawback that the mass productivity is not excellent. Further, as described above, since the
voice coil 10 must be formed by tightly winding in one row, a large number of turns of the lead
wire can not be formed, and a large driving force for vibrating the voice coil 10 is generated. In
the case of bass, it was not possible to accurately output an audio signal. Also, especially when
trying to put out the bass precisely, it becomes very accurate. It was not possible to form a
speaker or the like capable of producing a low-pitched sound with high accuracy. In addition, the
driving force T for vibrating the voice coil 10 is. T = t-It: Number of turns of wire ?: Ring current
given and driving force T overwhelms the number of turns of wire and current ? However,
conventionally, the number of winding turns t of wire is set to a large value for the above reason
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In addition to being unable to obtain a large driving force, the value of the current processor also
becomes large, and there is a drawback that the speaker 1 becomes inefficient. Further, in the
case of the conventional speaker 1, a dust cap 14 such as a dustproof cloth is attached to the
upper surface of the central portion of the @ moving body 9 so that dust in the air does not
intrude into the annular magnetic gap 13 due to its structure. It has had the drawback of leading
to an increase in labor and time, and an increase in the cost. Further, according to the abovementioned speaker 1, the field section (magnetic circuit) 6 has to use a large and heavy
permanent magnet 4 as shown in FIG. In addition, there is a drawback that it becomes very
expensive because a large permanent magnet has to be used. In addition, since the permanent
magnet 4 must be exposed and mounted because the large permanent magnet 4 is used as
described above, a considerable amount of the magnetic flux of the permanent magnet 4 leaks,
that is, such a large leakage flux However, there is a fear that the peripheral devices such as
various audio devices tending to be highly densely mounted may be adversely affected. In
addition, since a large permanent magnet 4 must be exposed and mounted as described above, a
considerable amount of the magnetic flux of the permanent magnet 4 leaks, so the speaker 1
becomes inefficient and a large and heavy permanent magnet is used. 1) A large amount of
expensive permanent magnet materials capable of generating a strong magnetic force has to be
used, which promotes the drawback of the speaker 1 being large, heavy, and expensive.
Further, in the case of the conventional speaker 1, since the voice coil 10 is in a moving type, it is
necessary to integrate the vibrating body 9 made of 9 papers or fibers and the coil bobbin 11; It
is troublesome to connect different foreign substances, and it has the disadvantage of not being
excellent in mass productivity. [Problems of the Invention] The biggest problem of the present
invention will be described later. First, the other problems will be described. First of all, the
concept of the conventional electrodynamic electroacoustic exchanger is completely changed to
start with the magnetic circuit (field unit ) Is an axial air gap type structure using a flat coil and a
magnet, which has an extremely simple and inexpensive structure, so that the thickness of the
magnetic circuit can be made extremely thin. It is. Similarly, the concept of a conventional
electrodynamic electroacoustic exchanger is completely changed to form a stator yoke
constituting a magnetic circuit on the acoustic signal generating side (in this case, an acoustic
signal may be received from the outside). I see. By arranging the vibrator inside to configure the
shape to protect the vibrator from the outside world, move the permanent magnet without
moving the coil, the coil pulls the lead wire and vibrates. It is an object of the present invention to
provide an electrodynamic electroacoustic exchanger having a long life and high reliability by
eliminating breakage due to lead wire breakage and solder detachment due to Further, by
adopting such a configuration, it is possible to prevent the leakage flux generated from the radial
direction of the permanent magnet without using a special leakage flux generating member for
preventing the leakage flux generated from the radial direction of the permanent magnet. It is
possible to form a leakage flux generating member for the purpose of closing the magnetic flux
so that a high performance electrodynamic electroacoustic exchanger can be obtained, and dust
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in the axial magnetic gap by the leakage flux generating member It is an object of the present
invention to make it possible to omit the dust cap by making it possible to prevent the entry of
H.sub.2 and to be able to be configured inexpensively. In addition, by setting the coil on the fixed
side, the lead wire can be prevented from passing through the magnetic gap between the coil and
the permanent magnet, and the troublesome step of soldering both terminals of the lead wire to
the vibrator etc. is omitted. The object is to make it excellent in mass productivity and
inexpensive to manufacture. Further, in the subject of the present invention, the coil is not moved
so that the lead wire does not come in sliding contact with the fixed side, and as a permanent
magnet, a magnet material having a specific gravity smaller than that of a lead (for example,
specific gravity 4 By using the ones of ~ 6 and moving it, the weight of the vibrator can be
reduced, the response speed can be increased, and audio signals can be extracted more
accurately over a wide range. In particular, it is an object of the present invention to make it
possible to configure inexpensively what can extract dynamic bass in particular.
That is, since the permanent magnet is moved, it is possible to prevent the permanent magnet
from becoming a large load and to generate one strong magnetic force, and even using a magnet
material that can generate such a strong magnetic force, The object is to make the permanent
magnet small and to configure 2 weights lightly, and to be able to configure the permanent
magnet inexpensively. Also, by making the coil not moveable, it is not necessary to adopt a
closely wound winding (also referred to as alignment winding) method of closely winding in a
row so that highly troublesome wires do not overlap. It is an object of the present invention to
make it possible to employ a single-winding wire so as to make it possible to adopt a glass
winding, and to make it possible to mass-produce the coil inexpensively and easily with a
reduced defect rate. In addition, the coil is formed into a flat air core type coil shape in which a
large number of turns of a lead wire which can be very inexpensively and easily wound can be
wound, and has sufficient space to accommodate a coil having a large number of turns of the
lead wire. A large coil for vibrating the permanent magnet by using a flat coil having a large
number of turns of conducting wire so as not to be able to form a magnetic circuit structure that
can be configured and that the coil does not need to form a close winding winding in one row. An
object of the present invention is to make it possible to generate a driving force so that an
accurate audio signal can be extracted even in the case of bass. In this case, the driving force T
for vibrating the permanent magnet is T = t?tt: the number of turns of the lead ? == the
current, and the number of turns of the 1 wA power ring and proportional to the current I By
forming the number of winding turns t to be a large value, it is possible to obtain a large driving
force T and to reduce the value of the current I, so that an efficient speaker or the like can be
obtained. It is an object of the present invention to provide an electrodynamic electroacoustic
exchanger. Furthermore. By simplifying the magnetic circuit configuration. It is easy to make the
leakage flux of the permanent magnet extremely small, and by doing so, external devices are not
adversely affected by the leakage flux of the permanent magnet, and the magnetic circuit can be
made small. The object of the present invention is to make it possible to configure a small-sized
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speaker that is light in weight and inexpensive and easily. Means for Achieving the Object of the
Present Invention According to the object of the present invention, there is provided a frame
made of a magnetic material having a through hole on the outer side for generating and / or
absorbing sound, and the outer periphery of the frame is provided at the center portion of the
frame. The stator yoke is formed to form a magnetic circuit having an axial magnetic air gap
connected via a portion and a stay, and the outer peripheral portion excluding the portion
connected to the stay of the outer periphery of the stator yoke is a side surface side of the
permanent magnet To form a peripheral wall for preventing the generation of leakage flux in the
radial direction of the permanent magnet, and winding a large number of turns of the conducting
wire in the axial magnetic gap formed by the inner surface portion of the stator yoke having the
peripheral wall A flat single-pole permanent magnet in which a flat vibration force generating
coil such as an air-cored coil formed is fixed, and the upper surface and the lower surface are
magnetized in different poles via the vibration force generating coil and an axial gap. The magnet
The magnetic gap of the circuit is provided so as to be able to reciprocate in the axial direction,
and the oscillating member which is interlocked or abutted by the reciprocating vibration in the
axial direction of the permanent magnet generates the sound of the stator yoke by directly or
spacing the permanent magnet. It is achieved by providing it on the inner side opposite to the
outer side for absorbing and / or absorbing.
[First Embodiment of the Present Invention] FIG. 1 is an exploded perspective view of the main
part of the dynamic cone speaker 16 according to the present invention, FIG. 2 is a longitudinal
sectional view thereof, and FIG. It is an expansion perspective view of a stator yoke part which
has a peripheral wall. A first embodiment of the present invention will be described below with
reference to FIGS. 1 to 3. A dynamic cone speaker 16 according to a first embodiment of the
present invention is a magnetic body 1, for example, a frame 18 formed of a magnetic body
integrally formed with a disc-shaped stator yoke 17 at the center by an iron plate by pressing
means. The stator 19 is formed. The upper surface portion of the frame 18 is curved downward
in the drawing (see FIG. 2) as it faces the central portion. Further, the frame 18 has four through
holes 20 formed on the upper surface in order to emit the generated sound to the outside. That
is, in the frame 18, the outer peripheral portion 18a thereof and the stator yoke 17 are
connected via the stay 18b. In addition, the stator yoke 17 is formed so as to extend over the
permanent magnet 2511tl so as to be positioned on the outer periphery of a permanent magnet
25 described later so as to surround the permanent magnet 25. The peripheral wall 17a is
formed so that the magnetic path generated from the radial direction of the permanent magnet
25 is also closed by the peripheral wall 17a to prevent the generation of the leakage flux in the
radial direction of the permanent magnet 25 and the shaft indicated by t1. It acts as a dust cap to
prevent the ingress of dust in the air into the magnetic gap 26 in the direction. Further, the frame
18 is formed with the four corners extended downward to integrally form the fixing leg 21, and
the end is bent at a right angle in the radial outer direction to form a through hole 22 for passing
a fixing screw. The fixing flange 23 is formed. An upper peripheral portion of a cone-shaped
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vibrating body 24 formed of paper, fiber, thin film plastic or the like is bonded to an upper
peripheral portion of the frame 18 together with a gas target (not shown) by an adhesive or the
like. The lower end central portion of the vibrating body 24 has a thickness of 1 mm or less (this
may vary depending on the specification or size of the speaker 16, but may be formed to be
about 0.5 mm for small speakers 16 etc.) The formed single-pole permanent magnet 25 is
coupled and disposed in the axial magnetic gap 26 so as to be capable of reciprocating oscillation
in the axial direction. The flat permanent magnet 25 can be easily formed with an appropriate
magnet and an appropriate formation method thereof so as to satisfy the purpose of the present
invention.
?????? & By using a flat plate made of a resin magnet of neodymium / iron / boron based
on suitable axial anisotropy, it is possible to easily construct one that can fully satisfy the
purpose of the present invention. . An anisotropic magnet is a magnet that is spin-oriented
forcibly, and can generally be manufactured by applying a strong magnetic field before the
magnet material hardens. Here, as a magnet material for forming the optimum permanent
magnet 25, the permanent magnet 25 to be formed is an air-core type described later (the aircore type described here means the coil 27 after the coil 27 is formed by conducting wires. 1) a
magnetic flux density that is lighter than the specific gravity of the flat vibration force generating
coil 27 (note that this coil 27 may not necessarily be an air core type) In addition, it is preferable
that the material is extremely easy to process or form. The permanent magnet 25 for this
purpose has a specific gravity of 4 so that a strong magnetic force can be obtained as a magnet
and an extremely thin material can be easily obtained. An axially anisotropic neodymium / iron /
boron resin magnet of ~ 6 or so is formed into a flat plate by an appropriate means such as
injection molding or molding. . The permanent magnet 25 is magnetized in a single pole so as to
have different poles in the upper and lower surfaces because it is axially anisotropic. In this
embodiment, the upper surface is an S pole. The lower surface is a single pole magnetized and
formed into an N pole. The permanent magnet 25 holds the permanent magnet 25 at a
predetermined position of the magnetic gap 26 and is supported by a damper to apply
appropriate damping (damping) to vibration, and the permanent magnet 25 is supported by the
magnetic gap 26 of the field section. Although it may be properly positioned inside, such a
situation is possible without it, and in this embodiment, the magnetic gap in the axial direction
with the upper surface of the permanent magnet 25 shows an example in which no damper is
used. On the inner surface of the stator yoke 17 opposed via 26, an air-core type flat, flat,
vibrational force generating coil 27 formed by winding a suitable number of turns of wire is fixed
using an adhesive. I see. The lead wire 28 drawn to the upper end portion of the vibration force
generation coil 27 is led to the outside through the stay 18 b. In addition, the code | symbol 29
shows the winding frame formed with the plastic. [Second Embodiment of the Invention] FIG. 4 is
an exploded perspective view of the main part of a dynamic cone speaker 16-1 according to the
present invention, and FIG. 5 is a longitudinal sectional view thereof. The second embodiment of
the present invention will be described below with reference to FIGS. 4 and 5.
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The same reference numerals as in the first embodiment denote the same parts as in the first
embodiment, and a description thereof will be omitted. The dynamic cone speaker 16-1
according to the second embodiment of the present invention is added from the lower side by an
accident during transportation as the dynamic cone speaker 16 shown in the first embodiment.
Since it is used to damage the vibrator 24 by some external pressure, it is made to prevent it.
Furthermore. In the speaker 16 of the first embodiment, the moving yoke is not attached to the
lower surface of the permanent magnet 25. This is because, when the moving yoke is fixed to the
lower surface of the permanent magnet 25, the load of the movable body becomes heavy by the
weight of the moving yoke and the response becomes poor, and a predetermined specification is
satisfied. To avoid being unable to However, as it is, the magnetic flux of the permanent magnet
25 leaks to the lower side to form an inefficient one, and the magnetic flux may adversely affect
the external device. Furthermore. By external pressure applied from certain externals during
transport from the downward direction. There is a risk of damaging the vibrator 24. For this
reason, a protective cover plate 31 made of a magnetic material and having through holes 30
substantially coinciding with the through holes 22 formed at the four corners is fixed to the
lower part of the speaker 16. In this case, the protective cover plate 31 may be fixed in advance
to the lower part of the flange 23, or may be fixed using a screw (not shown) when fixing the
speaker 16 to the fixed side. The protective cover plate 31 may be temporarily fixed using a
screw (not shown) at the lower part. By providing the protective cover plate 31, damage to the
vibrating body 24 due to the action of the external world from the lower side can be prevented,
and the magnetic path in the lower direction of the permanent magnet 25 can be closed to
generate a large vibrational force. Thus, the speaker 16-1 with higher efficiency and performance
can be obtained, and the dust in the air can be prevented from entering the magnetic gap 26
from the lower side of the diaphragm 24. [Operation of the Invention] In the present invention,
the principle of the operation is the same. Therefore, to explain with reference to the first
embodiment, in the speaker 16, an alternating current having a magnitude based on an acoustic
signal in the vibration force generating coil 27. Because flowing generates oscillating force along
the axial direction of the magnetic air gap 26 according to Fleming's left-hand rule. The
permanent magnet 25 reciprocates in the magnetic gap 26 along its axial direction. For this
reason, the vibrating body 24 fixed to the permanent magnet 25 vibrates, and an acoustic signal
sound of an appropriate wavelength and size can be generated.
Since the present invention has the above configuration, the stator yoke constituting the
magnetic circuit is formed on the acoustic signal generation side (in this case, the acoustic signal
may be received from the outside), and inside thereof Since the vibrating body is disposed to
protect the vibrating body from the outside, there is an effect that breakage of the vibrating body
due to some other external pressure from the external direction can be prevented. In addition,
the coil for generating vibrational force is fixed, and the permanent magnet moves. An
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electrodynamic electroacoustic exchanger with high reliability and long life is eliminated such as
breakage due to sliding contact of lead wire due to lead wire being dragged and vibrational
contact of lead wire as in a conventional speaker etc. You can get In addition, unlike the
conventional movable voice coil type, since the troublesome process of soldering the both
terminals of the lead wire to the vibrator or the like can be omitted, there is an effect of being
excellent in mass productivity and inexpensive to manufacture. Also for such a configuration, to
the vibrating body. Since it is not necessary to solder the terminals of the lead wires, it is possible
to mass-produce the vibrator inexpensively and easily using a desired thin film plastic. In
addition, when the permanent magnet is made of an axially anisotropic 1 such as neodymium /
iron / boron resin magnet material which has a specific gravity smaller than that of a lead and
can increase the magnetic force, the 5 permanent magnet can generate a strong magnetic force
and Since the amount of use of the magnet material can be small, the weight of the vibrator can
be reduced, the response speed can be increased, and an audio signal can be extracted more
accurately over a wide range, which is difficult in the related art. In particular, there is an effect
that it is possible to construct inexpensive ones with high efficiency that can take out dynamic
bass. Also, since the permanent magnets can be small and extremely lightweight, the magnetic
circuit can be configured very easily. The magnetic path of the permanent magnet can be closed
sufficiently. There is an effect that the leakage flux due to the permanent magnet does not
adversely affect the external device of the speaker. In addition, since a permanent magnet can
form a magnetic circuit so that only a small amount of leakage flux is generated, neodymium /
iron / boron resin magnet or the like that generates a strong magnetic force with high cost per
dull compared to a ferrite magnet is used. Also, since the permanent magnet is very thin and light
in weight, the amount of use of the magnet material constituting the permanent magnet is small,
so that the permanent magnet can be formed at low cost. Further, the magnetic circuit including
the permanent magnet can be formed simply, in a small size and in a light weight, and as a result,
the speaker can be formed in a small size and in a light weight.
Furthermore, since a sufficient space can be accommodated and the coil can not be moved, it is
not necessary to adopt a close-wound winding method in which the very troublesome wires are
closely wound in a row so as not to overlap. The use of the glass winding makes the singlewinding production extremely easy, and the defect rate can be reduced, and the coils can be
mass-produced inexpensively and easily. Furthermore. Even if the thickness is thin, a strong
magnetic force can be generated (especially, recent technology makes this possible). A
permanent magnet is formed of a magnet material and a flat air-core type vibration force
generating coil wound with many turns is used. Therefore, by using the coil formed by winding a
large number of turns of the lead wire, it is possible to generate a large driving force for vibrating
the permanent magnet, and an accurate voice signal can be generated even in the case of bass.
There is an effect that can be taken out. That is, driving force T for vibrating the permanent
magnet T = t?It: number of turns of wire I: Since the number of turns t of the wire can be made a
large value in the current, a large driving force T can be obtained. Since the value of I can also be
03-05-2019
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reduced, there is an effect that an electrodynamic electroacoustic exchanger such as a speaker
with high efficiency can be obtained. Although the embodiment of the present invention has
mainly described the speaker, the present invention is naturally applicable to an electrodynamic
electroacoustic exchanger such as a microphone having a common structural principle. Further,
in the present invention, an example of the speaker in which the permanent magnet and the
vibrating body are directly connected is shown, but the permanent magnet and the vibrating
body are disposed at a predetermined interval, and each time the permanent magnet vibrates
Even in the case where the vibrator is vibrated indirectly or indirectly via another member, since
it is the same as the principle described above, it is naturally applicable to these.
[0002]
Brief description of the drawings
[0003]
1 is an exploded perspective view of the main part of the dynamic cone speaker according to the
first embodiment of the present invention, FIG. 2 is a cross-sectional view of the same edge, and
FIG. 3 is an enlarged perspective view of a stator yoke portion having a peripheral wall, FIG. 4 is
an exploded perspective view of the main part of the second embodiment of the present
invention, FIG. 5 is a longitudinal sectional view thereof, and FIG. 6 is a longitudinal sectional
view of a conventional dynamic cone speaker.
(Explanation of symbols) 1: Dynamic cone speaker. 2 ... Center ball (central magnetic pole). 3 ...
Center ball, 4 ... Permanent magnet. 5 ? ? ? upper yoke plate, 6 ? ? ? field part. 7 и и и Frame
68 и и и Gasket (arrow), 9 и и и vibration body. ???????????? ???????????
??????????? 13 ... magnetic gap. ????????????? 15 иии Lead wire.
??????????????????????????????????????? 17a:
peripheral wall, 18: frame. 18a: outer peripheral portion, 18b: stay 719: stator, 20: through hole.
21 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и 21 и и и Fixing legs, 22 ... through holes. 23 ? ?
? Fixing flange. 24 иии Vibrator, 25 иии Permanent magnet. 26: Magnetic gap in the axial direction.
27 иии Vibration force generating coil. 28 иии Lead wire, 29 иии Winding frame. 30 ... through hole, 31
... protective cover plate.
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