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JPH0227896

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DESCRIPTION JPH0227896
[0001]
The present invention relates to an electrodynamic electroacoustic exchanger (electrokinetic
electroacoustic apparatus) such as a speaker, a microphone, and an earphone, and is
characterized in that a coil for generating a vibration force is used. It is fixed, the field magnet
moves, and the weight of the movable body can be reduced. As a result, the response speed is
improved to increase the efficiency of converting the vibration into sound or current. Accurate
low-pitched sound can be easily generated, and it is possible to expect long-life products by
avoiding lead wires, and to simplify the structure and enable mass production at low cost. It is an
efficient electro-acoustic exchanger. [Technical background and problems thereof]
Electrodynamic electroacoustic exchanger 7 For example, when a voice coil is movably disposed
in a magnetic field and a voice current flows, the voice coil vibrates as the current changes. It is a
thing. In this case, a speaker that reproduces a sound wave by moving a vibrating body with a
coil is called a dynamic speaker. And what directs a coil to a cone (cone) paper etc. and emits
sound waves is called a dynamic cone speaker, and a small vibrating body is moved by a voice
coil, and a horn (in other words, a wrapper) is attached to the front to improve efficiency. Those
that emit sound waves well are called dynamic horn speakers. Since all of these electrodynamic
electroacoustic exchangers have the same basic structure, a dynamic cone 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. The field section 6 shown here is called an external magnet type, but it
may be an internal magnet type using a yoke and incorporating a columnar permanent magnet
and a center ball at the center of the inside of the yoke. good. A cone-shaped frame 7 is
connected to the field portion 6, and a peripheral edge of the cone-shaped vibrating body 9 is
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joined with an adhesive or the like to the peripheral edge of the frame 7 together with a gasket
(arrowhead). There is. The voice coil 10 formed in a cylindrical shape at the central portion of the
vibrating body 9 is L # I! A coil bobbin 11 formed of paper, thin plastic or the like wound around
the lower part of the vibrating body 9 is coupled.
The middle portion of the coil bobbin 11 holds the voice coil 10 at the center of the magnetic
pole and is supported by a damper 12 for applying appropriate damping (damping) to the point i.
I am trying to position correctly inside. 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, since
the voice coil 10 vibrates by dragging the lead wire, the lead wire may be cut or the lead wire
may be detached from the solder depending on long-term use, resulting in breakage. There is a
fear and there is a drawback that the life is shortened. Further, the lead wire (not shown) of the
voice coil 10 is drawn out of the upper part through the magnetic gap 13 from its both terminals,
led to the vibrating body 9 (or may be the frame 7) and soldered to that position. Therefore, (1)
The magnetic flux density in the magnetic gap 13 is increased by the thickness of the lead wire
by using the voice coil 10 whose thickness is limited in order to pass both terminals of the lead
wire of the voice coil 10 in the magnetic gap 13 It could not be done and was inefficient. ? In
order to pass both terminals of the lead wire of the voice coil 10 into the magnetic gap 13 and
both terminals of this lead wire must be soldered to the vibrating body 9 or the like, mass
productivity is not good and expensive It had become. In the case where the vibrating body 9 is
formed of a thin film plastic of the present day, when the terminal of the lead wire is soldered to
this, the heat at that time makes the hole clear and the defect rate increases. 9 could not be
formed, and mass production could not be done inexpensively. Also, since both ends of the lead
wire of the voice coil 10 are passed through the magnetic gap 13, the lead wire is used to contact
the fixed side at the time of vibration of the voice coil 10, and it must be manufactured with great
accuracy. The defect rate was also very high. Further, in the case of the conventional speaker 1,
since the voice coil 10 is vibrated, the wire constituting the voice coil 10 has a large load because
its specific gravity (specific gravity of copper is about 7) is heavy, and the response speed There
was a drawback that it was not possible to extract the audio signal more accurately over a wide
range of late ones. In particular it was not enough to take out dynamic bass. In addition, the
magnetic gap 13 is widened to prevent the weight of the voice coil 10 from becoming heavy so
that the drawback of the above 1 due to the fact that the lead wire for forming the voice coil 10
is very heavy is eliminated. 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.
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{Circle over (1)} One of the causes of the disadvantages 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. The driving
force T for vibrating the voice coil 10 is. T = t?It: Number of turns of wire I: Given by current,
conventionally, since the number of turns of wire winding t can not be made a large value for the
above reason, a large driving force as described above Not only can it be obtained, but the value
of the current I also increases, and there is a drawback that the speaker 1 becomes inefficient.
Further, according to the above-mentioned speaker 1, the field section (magnetic circuit) 6 has to
use a large and heavy permanent magnet 4 as shown in FIG. Some have had the disadvantage of
being very expensive because they have to use large permanent magnets. In addition, since the
permanent magnet 4 must be exposed and mounted because the large permanent magnet 4 is
used as described above, a large amount of magnetic flux of the permanent magnet 4 is leaked,
that is, such a large leak Magnetic flux may adversely affect various kinds of audio equipment
which tends to be densely packed. 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 constituting a strong magnetic force has to be used, which promotes the drawback of the
speaker 1 being large, heavy and heavy. SUMMARY OF THE INVENTION The object of the
present invention is to completely change the concept of the conventional electrodynamic
electroacoustic exchanger, and to move the field magnet without moving the voice coil. It is an
object of the present invention to provide a highly reliable electrodynamic electroacoustic
exchanger that has a long life and is free from breakage due to lead wire breakage due to lead
wire vibration due to the voice coil dragging.
In particular, in an electrodynamic electroacoustic exchanger configured to achieve such a task,
vibration is performed for the purpose of waiting for a high-performance, low-pitched acoustic
signal, while achieving the task described later, while achieving the task described later. By
applying a substantially uniform magnetic flux to the voice coil regardless of the position of the
field magnets that make up the element at any position within the movable strip, an oscillating
force with a magnitude based on a constant ratio is always obtained. It is an object of the present
invention to make it possible to obtain an acoustic signal with high performance by obtaining. An
object of the present invention is to solve the above-mentioned problems and to solve the
following problems. In addition, the lead wire can be prevented from passing through the
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magnetic gap 13, and the troublesome step of soldering both lead wires to a vibrator or the like
can be omitted, and the mass productivity can be made excellent and inexpensive. Was a task to
do. According to another premise of the present invention, the voice coil is not moved so that the
lead wire does not come in sliding contact with the fixed side, and the wire forms a voice coil as a
field magnet. By using a magnet material with a low specific gravity (for example, one with a
specific gravity of 4 to 6) and moving it, the weight of the vibrator can be lightened, the response
speed can be increased, and a wide range can be achieved. An object of the present invention is
to make it possible to extract an audio signal more accurately, and in particular, to be able to
configure inexpensively one that can extract dynamic bass. That is, since the field magnet is
moved, it is possible to prevent the field magnet from becoming a large load and to generate two
strong magnetic forces, and use a magnet material that can generate such strong magnetic
forces. Also, it is an object of the present invention to make it possible to configure the field
magnet at low cost by reducing the size and weight of the field magnet. As described above, even
if a magnetic material (for example, one having a specific gravity of 4 to 6) having a specific
gravity smaller than that of a conducting wire forming a coil as a field magnet is used, (1) radial
anisotropy which can obtain strong magnetic flux The object of the present invention can be
achieved by using an appropriate magnet material of rare earth type or neodymium / iron /
boron type. Also, by making the voice coil not to move, a closely wound winding method (also
referred to as alignment winding) of closely winding in one row is adopted so that highly
troublesome wires do not overlap # 1: By making it possible to adopt a glass winding which does
not need to make 9 winding production extremely easy, and reducing the defect rate so that the
voice coil can be mass-produced inexpensively and easily, an electrodynamic type of constant
quality with a low defect rate It is an object of the present invention to make it possible to massproduce the electroacoustic exchanger inexpensively.
Of course, according to the present invention, it is needless to say that the voice coil of the
conventional speaker may be used as it is. Also, for the purpose of obtaining extremely large
vibrational force according to certain specifications, the voice coil should be tightly wound in one
row as well as configured to have enough space to accommodate the multi-turn wound voice coil.
Using a voice coil in which multiple turns of wire are formed so that winding formation is not
required. An object of the present invention is to make it possible to generate a large vibrational
force for vibrating the field magnet and to be able to take out an accurate audio signal even in
the case of a bass. . By doing this, a large driving force for vibrating the field magnet TT = t-It:
number of turns of wire winding: in the current, the number of turns of wire winding t is formed
to be a large value By making it possible to obtain a large driving force T and to reduce the value
of the current I, it is possible to obtain an electrodynamic electroacoustic exchanger such as an
efficient speaker. Was made to the task. Furthermore. By simplifying the magnetic circuit
configuration. By making the leakage flux of the field magnet extremely small, the external
equipment is not adversely affected by the pieces of the leakage flux of the field magnet, and the
'small size of the magnetic circuit makes the weight small and compact. It is an object of the
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present invention to make it possible to configure the speaker of the present invention
inexpensively and easily. [Problem to be achieved by the present invention] The subject of the
present invention is to provide a cylindrical voice coil fixed in a cylindrical magnetic gap of a
magnetic circuit, and to provide the voice coil with the magnetic coil in the radial direction via
the magnetic gap. A cylindrical single-pole field magnet, the outer surface of which is magnetized
differently, is provided movably in the axial direction in the magnetic gap, and the field magnet
has an axial length of L ? m + x + ?? =. ?a + ?bm <L> x, ?> ?a, ?b where 1 m: axial length
of voice coil X: vibration distance of field magnet length ?: deflection of magnetic flux
distribution at axial end of field magnet In order to suppress the fluctuation of the magnetic
distribution small, the length ?a of extra lengthening the field magnet: The fluctuation of the
magnetic distribution is suppressed small by the deflection of the magnetic flux distribution at
the upper end of the mini field magnet force direction , Extra field Length ?b for lengthening the
upper end of the gnett = The length of the lower end of the field magnet is extra-long in order to
suppress the fluctuation of the magnetic distribution by the deflection of the magnetic flux
distribution at the axial lower end of the field magnet This is achieved by setting the length for.
FIG. 1 is an exploded perspective view in which a part of a dynamic cone speaker 15 according to
the present invention is cut away and omitted, and FIG. 2 is a longitudinal sectional view, FIG. 3 is
an explanatory view of the axial length of the field magnet 21 and the voice coil 22 in relation to
each other. A first embodiment of the present invention will be described below with reference to
FIGS. 1 to 3. A dynamic cone speaker 15 according to a first embodiment of the present
invention is formed by molding the magnetic body 1, for example, a plastic powder-containing
magnetic body. Center pole (central magnetic pole) 16. By integrally forming the yoke plate 17
and the frame 18. A stator 19 to be a field portion is formed. The center ball 16 is formed
integrally with the bottom central portion 17a of the cup-shaped yoke plate 17 so as to extend
upward in a cylindrical shape, and is integrally formed between the outer periphery 16a and the
inner peripheral surface 17b of the yoke plate 17. The magnetic gap 20 is formed. ???? A
cone-shaped frame 18 is integrally formed on the upper end portion of the outer periphery 17 c
of the cup-shaped yoke plate 17. A peripheral portion of a cone-shaped vibrating body 21 is
bonded to a top end peripheral portion of the frame 18 together with a gas target (not shown) by
an adhesive or the like. The thickness is about 1 mm or less at the center of the lower end of the
vibrating body 21 (this thickness varies depending on the specifications, size, etc. of the speaker
15, but the small speaker 15 or the like). The field magnet 22 formed in a cylindrical shape
sufficiently sufficient at about 0.5 mFn is coupled, and in the magnetic gap 20, reciprocating
vibration can be performed in the axial direction. The cylindrical field magnet 22 is a cylindrical
field magnet 22 having a cylindrical shape composed of an appropriate magnet such as a
neodym-boron-iron-based or rare earth-based resin magnet of radial direction (radial direction)
anisotropy. It is possible to easily form one that can fully satisfy the spirit of the invention. An
anisotropic magnet is a magnet that is forcibly spin-oriented, and can generally be manufactured
by applying a strong magnetic field before the magnet material hardens. Here, as a magnet
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material for forming the optimum field magnet 22, the formed field magnet 22 is lighter than the
specific gravity of the voice coil 23 described later, and a strong magnetic flux density can be
obtained. Easy things are desirable. For this reason, 1 field magnet 22 selected and prototyped by
the present inventor can obtain strong magnetic force as a magnet, and can easily obtain an
extremely thin one. For example, specific gravity is about 4 to 6 or so Using neodymium / boron
/ iron-based resin magnet oriented in the radial direction (radial direction) of
This is formed into a cylindrical shape by injection or compression molding means. The field
magnet 22 is magnetized in a single pole so as to have different poles on the inner and outer
peripheries, since it has radial anisotropy and one magnetization direction is regulated. In this
embodiment, the inner periphery is a single pole with the N pole and the outer periphery a S
pole. The middle part of the field magnet 22 is the field magnet 22f! : A magnetic pole central
portion is held, supported by a damper (not shown) for applying appropriate damping (damping)
to vibration, and the field magnet 22 is properly positioned in the magnetic gap 20 of the field
portion. Further, a dust cap 24 such as a dustproof cloth is attached to the upper surface of the
central portion of the vibrator 21 so that dust in the air does not intrude into the magnetic gap
20. On the inner peripheral surface 17b of the yoke plate 17, a voice coil 23 formed in a
cylindrical shape by appropriately winding the lead wire is fixed using an adhesive. The lead wire
25 of the voice coil 23 is drawn out from the through hole 26 provided in the lower part of the
yoke plate 17 and led to an external circuit. One important issue of the present invention in the
scarf 15 of such a structure is that the magnetic flux that is substantially uniform is applied to
the voice coil 23 regardless of the position within the movable stroke of the field magnet 22 that
constitutes the fi mover. It is necessary to obtain an acoustic signal with good performance by
making it possible to obtain an oscillating force having a magnitude based on a constant ratio by
being given. Here, in the dynamic cone speaker 15 having the above magnetic circuit, if the axial
lengths of the field magnet 22 and the voice coil 23 are appropriately formed, the upper and
lower end portions in the axial direction of the field magnet 22 can be obtained. In the above,
depending on the position of the field magnet 22 in the magnetic gap 20, the field magnet 22 is
vibrated based on a predetermined acoustic signal due to the magnetic flux distribution at the
end of the field magnet 22 in the vertical axis direction. As well. The vibration force and vibration
response of the field magnet 22 are greatly affected. As a result, an acoustic signal with good
performance can be obtained by being able to vibrate with a uniform magnitude based on a
constant ratio at any position within the axial movable stroke in the magnetic gap 20 of the field
magnet 22. It is desirable to be able to For this purpose, in the speaker 15, as shown in FIG. 3, in
the magnetic circuit, the axial length of the field magnet 22 and the voice coil 23 axial direction
are formed under the conditions defined below. There is.
In addition, since the rule of the embodiment shown here can be commonly adopted to the other
embodiments, the rule described in this embodiment can naturally be considered also in the
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other embodiments as needed. Therefore, this will not be described in detail in the other
embodiments below. That is, in the loudspeaker 15 described in this embodiment, the axial
length of the field magnet 21 is L. L ? m + x + ?? = ?a + ?bm> L> x, ?> ?a, ?b where 2m:
axial length of voice coil 23 X: vibration distance of field magnet 22 ?: axial direction of field
magnet 22 By the bow of the magnetic flux distribution at the end. Length ?a for lengthening
the field magnet 22 excessively to suppress fluctuations in the magnetic distribution small: ?: To
suppress fluctuations in the magnetic distribution small by the deflection of the magnetic flux
distribution at the upper end in the direction of the field magnet 22 To lengthen the upper end of
the field magnet 22 excessively, by the deflection of the magnetic flux distribution at the axial
lower end of the field magnet 22, to suppress the fluctuation of the magnetic distribution By
setting the length of the lower end portion of the magnet 22 to be long, the voice coil 23 can
make the magnetic flux distribution received from the field magnet 22 in the magnetic gap 20
substantially uniform. As a result, the oscillating force obtained by energizing the voice coil 23
has a size based on a fixed ratio because the magnetic flux distribution is substantially uniform
within the movable stroke of the field magnet 22, so the performance is good. A speaker 15
capable of obtaining an acoustic signal can be formed. [Second Embodiment of the Invention]
FIG. 4 is an exploded perspective view of the main part of a dynamic cone speaker 15 'according
to the present invention, and FIG. 5 is a longitudinal sectional view thereof. Referring to FIG. 4
and FIG. Second Embodiment A second embodiment of the present invention will be described
below. ??? 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. A dynamic cone speaker 15
'according to a second embodiment of the present invention is integrally formed with a cupshaped center ball 16 ░, a yoke plate 17' and a frame 18 by using magnetic material such as
iron plate by pressing means or the like. By doing this, a stator 19 'to be a field portion is formed.
The center ball 16 ? ? is integrally formed in a cup shape by pressing means so that the inside
becomes a cavity at the center of the bottom surface of the cup-shaped yoke plate 17 ░ in order
to reduce the weight and the cost, It extends.
A cylindrical magnetic gap 20 ░ is formed between the outer periphery of the center ball 16 ░
and the inner peripheral surface of the yoke plate 17 '. Then, a cone-shaped frame 18 'is
integrally formed on the upper end portion of the outer periphery of the cup-shaped yoke 17 ░.
In the frame 18 ', the through hole 27 is formed by pressing means 6, and the upper end
peripheral portion of the frame 18' is connected with the gas target (not shown) together with
the peripheral portion of the cone-shaped vibrating body 21 ' For this purpose, a flange 29
having a through hole 28 is formed. Reference numeral 30 denotes a serpentine portion. The
configuration of the other parts of the speaker 15 'is the same as that shown in the first
embodiment, so the description thereof will be omitted. The reference numeral 26 ░ indicates a
through hole. [Operation of the Invention] In the present invention, the principle of operation is
the same, and therefore, when it is explained with reference to the first embodiment, alternating
current of a magnitude based on an acoustic signal is supplied to the voice coil 23 at spill force 1
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Since the force oscillating back and forth along the axial direction of the magnetic gap 20 is
generated according to Fleming's left-hand rule, the field magnet 22 oscillates back and forth in
the magnetic gap 20 along the axial direction. For this reason, the vibrating body 21 fixed to the
field magnet 22 vibrates, and an acoustic signal sound of an appropriate wavelength and size can
be generated. [Effects of the Invention] As apparent from the above configuration, according to
the present invention, the length L of the field magnet in the axial direction is L ? m О 10 +
?? = ?a + ?bm> L> x, a> aa, ab but 9 m: voice coil Axial length X: Vibration distance of the
field magnet Length ?: Excessive field magnet to suppress the fluctuation of the magnetic
distribution by deflection of the magnetic flux distribution at the axial end of the field magnet
Length ?a to lengthen: ?: Length ?b to lengthen the top end of the field magnet excessively in
order to suppress the fluctuation of the magnetic distribution small by the magnetic flux
distribution at the top end in the direction of the field magnet = The length of the lower end of
the field magnet is set to be extra long in order to suppress the fluctuation of the magnetic
distribution small by the magnetic flux distribution at the lower end in the axial direction of the
field magnet. , Bo The coil can substantially equalize the magnetic flux distribution received from
the field magnet in the magnetic gap. As a result, the vibration force obtained by energizing the
voice coil has a magnitude based on a fixed ratio because the magnetic flux distribution is
substantially uniform within the movable stroke of the field magnet, and an acoustic signal with
good performance is obtained. There is an effect that can be obtained.
In addition, the conventional voice coil is not required to be used because it is troublesome and
effective, and the voice coil does not move and the field magnet is moved. It is possible to obtain
a highly reliable and long-lived electrodynamic electroacoustic exchanger without any breakage
due to lead wire breakage or solder detachment. Moreover, since the troublesome process of
soldering both terminals of the lead wire of the voice coil to the vibrator etc. can be omitted. It
has excellent mass productivity and can be manufactured inexpensively. In addition, since it is
not necessary to solder the terminal of the lead wire to the vibrator, it is possible to massproduce the vibrator at a low cost and easily using a desirable material such as thin film plastic.
Also, the field magnet (for example, specific gravity 4 to 6) has a specific gravity smaller than
that of the conducting wire (specific gravity 7) forming the voice coil and can make the magnetic
force stronger. Etc., the field magnet can generate a strong magnetic force, and the amount of
use of the magnet material can be small, so the weight of the vibrator is reduced, the response
speed is increased, and the wide range is achieved. In the prior art, it has been difficult because
the speech signal can be extracted more accurately. In particular, there is an effect that it is
possible to construct inexpensive ones with high efficiency that can take out dynamic bass. In
addition, since the field magnet can be made small and extremely light in weight, the magnetic
circuit can be configured very easily, and the magnetic path of the field magnet can be
sufficiently viewed. Leakage due to the field magnet The magnetic flux does not adversely affect
the external device of the speaker. In addition, since the field magnet can form a magnetic circuit
so that only a small amount of leakage flux is generated, the use of resin magnets such as
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neodymium, boron, iron, rare earths, etc., which has a higher cost per dam compared to ferrite
magnets. Also, since the field magnet can be made very thin and light in weight, the amount of
use of the magnet material constituting the field magnet is small, so that the field magnet can be
formed inexpensively. In addition, the magnetic circuit including the field magnet is simple. As a
result of being able to be formed in a small size and light weight, there is an effect that an
electrodynamic electroacoustic exchanger such as a speaker can be formed in a small size and
light weight. Furthermore, since there is sufficient space and the voice coil does not move, it is
not necessary to adopt a close-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 single-winding
production extremely easy, and the defect rate can be reduced, and the voice coil can be massproduced inexpensively and easily.
Furthermore. Since a field magnet can be formed of a magnet material which can generate a
strong magnetic force even if the thickness is thin (especially, recent technologies make this
possible) and a voice coil wound with many turns can be used, a large number of conducting
wires can be used. By using a voice coil with a turn winding formed, it is possible to generate a
large driving force for vibrating the field magnet, and it is possible to extract an accurate audio
signal even in the case of a bass. There is. That is, in the case of a large driving force TT = t-1t for
vibrating the field magnet: the number of turns of wire winding of the wire 11 = the current, the
number t of turns of the wire can be made a large value. Since the value of the current 1 can be
reduced, there is an effect that an electrodynamic electroacoustic exchanger such as an efficient
spy force 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.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an exploded perspective view of a dynamic cone speaker according to a first
embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the dynamic cone
speaker according to the first embodiment of the present invention, and FIG. Explanatory
drawing for demonstrating the relationship of the length of the axial direction of a coil, FIG. 4 is a
disassembled perspective view of the principal part of the dynamic cone speaker of 2nd Example
of this invention, FIG. 5 is the same edge sectional view FIG. 6 is a longitudinal sectional view of a
conventional dynamic cone speaker.
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[Description of the code] 1: Dynamic cone speaker. 2 ... Center ball (central magnetic pole). 3 ...
Center ball, 4 ... Permanent magnet. 5 ? ? ? upper yoke plate, 6 ? ? ? field part. ?????
???? 8: Gasket (arrow), 9: Vibrator. ???????????? 11: coil bobbin, 12: damper
13: magnetic gap. ????????????? ??????????????????????
???????????????????? 16a и и и outer circumference, 17. 17. "и и и Yoke plate,
17a и и и base portion, 17b и и и inner circumferential surface, 17 C и и и outer circumference, 18. 18
░ и и и frame, 19. 19 ' ... Stator, 20 и annular magnetic air gap, 21.21 'и и и oscillating body. 22 иии
Field magnet, 23 иии Voice coil, 24 и и и Dust cap, 25 и Lead wire. 26.26 ', 27.28 ... through holes. 29
и и и и и и и и и и 30 и и и serpentine.
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