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JPH01258592

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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
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DESCRIPTION JPH01258592
[0001]
[Industrial field of application of the invention] The present invention relates to a speaker,
characterized in that the coil is fixed and the field magnet is moved, and the weight of the
movable body can be reduced, As a result, the response speed is improved, the efficiency of
converting the vibration into sound is enhanced, the sound of the bass can be easily generated,
and a long life can be expected without the lead wire being dragged, and the structure is
simplified. It was possible to mass-produce inexpensively. It has become an efficient speaker. In
particular, in the case of the speaker according to the present invention, it is easy to integrate the
vibrating body and the field magnet, and the mass productivity is excellent. Background of the
Invention and Related Problems The co-speaker is such that 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. Many conventional dynamic cone and
spin forces 1 are configured as shown in FIG. Permanent magnet consisting of cylindrical ferrite
magnet on yoke plate 3. 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 portion of a vibrating body 9 formed of a cone-shaped fiber together with
a gasket (arrowhead) 8 is adhered to the peripheral edge portion of the frame 7. It is bound by
the agent etc. 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
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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, 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, as shown in FIG. 7, the lead wire 15 of the voice coil 10 draws its both
terminals from the top through the magnetic gap 13 and guides it to the vibrating body 9 (or
may be the frame 7) and its position (1) By using the voice coil 10 whose thickness is limited in
order to pass both terminals of the lead wire 15 of the voice coil 10 in the magnetic gap 13, the
magnetism of only the thickness of the lead wire 15 The magnetic flux density in the air gap 13
can not be increased, resulting in inefficiency. ? 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. ? Also, if the vibrating body 9 is formed of thin film plastic of the
present, 2 if the terminal of the lead wire 15 is soldered to this, the heat at that time will make
the hole clear and the defect rate will increase, and vibration with desirable thin film plastic The
body 9 could not be formed, and mass production could not be performed at low cost. Further,
since both ends of the lead wire 15 of the voice coil 10 pass through the magnetic gap 13, there
is a fear that the lead wire 15 contacts the fixed side when the voice coil 10 vibrates, 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 lO is vibrated, (1) The specific gravity of the
conductive wire constituting the voice coil 10 (specific gravity of copper. There is a drawback
that the load is large because the weight is about 7), 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 the fact that the wire for forming the voice coil 10 is very heavy, ie, the weight
of the voice coil 10 is not heavy, In order not to reduce the magnetic flux density in the air gap
13, the wires must be closely wound in one row in close-packed (or referred to as aligned
winding) so as not to overlap. As described above, since the winding production of the voice coil
10 tightly wound in one row is very time-consuming and difficult, the defect rate is also high, and
it has the disadvantage of being 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
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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. In addition, especially
when trying to put out the bass with high accuracy, it becomes 2 very high accuracy. It was not
possible to form a speaker or the like capable of producing a low-pitched sound with high
accuracy. The large driving force T for vibrating the voice coil 10 is. T = t и и t: number of turns of
wire winding of lead ? = lightning current is given, but conventionally it is not possible to make
the number of turns of winding of wire t a large value for the above reason, so large as described
above Not only the driving force can not be obtained, but also the value of the current I is
increased, which causes the speaker 1 to be inefficient. 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, the voice coil 10 is of a moving type, so it is necessary
to integrate the vibrating body 9 made of two 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 problem of the present invention is that the coil vibrates by
pulling the lead wire by changing the concept of the conventional speaker and moving the field
magnet without moving the coil. An object of the present invention is to obtain a long-life and
reliable speaker by eliminating breakage due to lead wire cutting and solder detachment. In
addition, the lead wire can be prevented from passing through the 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 made to the task. 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 the magnet material having a smaller specific gravity than the lead as a
field magnet (for example, specific gravity) (4) By using this one and moving it, 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. In particular, it is an object of the present invention
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to make it possible to configure inexpensively what can extract dynamic bass in particular. That
is, since the field magnet is moved, it is possible to prevent the field magnet from becoming a
large load and to generate a strong magnetic force and to use a magnet material capable of
generating a strong magnetic force. However, since the field magnet is small and one weight is
reduced, it is an object of the present invention to make the field magnet inexpensive. In addition,
a close-wound winding method in which the very troublesome wires which have been
conventionally used in manufacturing a voice coil are closely wound in a single row so that the
coils do not need to be moved. It is an object of the present invention to make it possible to
employ a glass winding which does not need to be adopted to make manufacture of the 9winding wire extremely easy, reduce the defective rate, and enable mass production of the voice
coil. 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. In addition, it has a structure capable of forming a
space sufficient to accommodate a coil wound in multiple turns. The coils do not need to form
closely-wound windings in one row, and can generate a large driving force for vibrating the field
magnet by using a coil in which a large number of turns of lead wires are formed. In the case of
bass, it is an object of the present invention to make it possible to extract an accurate audio
signal.
By doing this, a large driving force for vibrating the field magnet TT = t-1t: the number of turns
of wire winding of the lead ? == the number of turns of wire winding t of the lead is made 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 an object to make it possible to obtain an efficient speaker. Furthermore. By
simplifying the magnetic circuit configuration. It is easy to make the leakage flux of the field
magnet extremely small, and by adopting this configuration, it is possible to make an external
device not to be adversely affected by the leakage flux of the field magnet, and to make the
magnetic circuit small. It is an object of the present invention to make it possible to configure a
small-sized speaker inexpensively and easily, which is light in weight. The first object of the
present invention is to solve the above-mentioned problems by making it possible to easily
integrate the vibrator and the driver so that they can be mass-produced inexpensively. [Problem
to be achieved by the invention of this invention] The problem of this invention is that the stator
coil is fixedly provided in the cylindrical magnetic gap of the magnetic circuit, and the inside of
the magnetic gap can be A field magnet is provided which is formed of cylindrical unipolar radial
anisotropic magnet materials in which inner and outer surfaces are magnetized to different poles
so as to be movable in the axial direction. This is achieved by integrating a vibrating body formed
of thin film plastic interlocked by the axial vibration movement of the field magnet with the end
of the field magnet. [Embodiment of the Invention] [First Embodiment of the Invention] FIG. 1 is
an exploded perspective view in which a part of the dynamic cone speaker 16 of the present
invention is cut away and omitted, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is an
enlarged view of the connecting portion of the vibrating body and the field magnet. A first
embodiment of the present invention will be described below with reference to FIGS. 1 to 3. A
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dynamic cone speaker 16 according to a first embodiment of the present invention is formed by
molding the magnetic body 2, for example, a plastic powder-containing magnetic body. Center
ball (central magnetic pole) 17. By integrally forming the yoke plate 18 and the frame 19. A
stator 20 which is a field portion is formed. The center ball 17 is formed integrally with the
bottom central portion 18a of the cup-shaped yoke plate 18 so as to extend upward in a
cylindrical shape, and is integrally formed between the outer periphery 17a and the inner
peripheral surface 18b of the yoke plate 18. A magnetic air gap 30 is formed.
Then, a cone-shaped frame 19 is integrally formed on the upper end portion of the outer
periphery 18 c of the cup-shaped yoke plate 18. A peripheral edge portion of a cone-shaped
vibrating body 21 formed of a thin film plastic together with a gasket (not shown) is bonded to
an upper end peripheral portion of the frame 19 by an adhesive, ultrasonic welding or the like.
The vibrating body 21 formed of thin film plastic and the field magnet 22 formed of a plastic
magnet are molded by two-color molding of a plastic and a plastic magnet simultaneously or
after either one is first molded. The bonding of the end portions of the vibrating body 21 formed
of thin film plastic and the field magnet 22 may be performed by integrally molding the other
and fixing them, and the bonding method is not limited to the above method, and an adhesive or
ultrasonic wave may be used. In the example shown in FIG. 3, the vibrator 21 made of thin film
plastic and the field magnet 22 made of plastic magnet may be integrated by using ultrasonic
welding means. ing. In this case, in this case, the vibrating body 21 formed of thin film plastic
and the field magnet 22 formed of a plastic magnet are substances having similar properties, so
as described above, using ultrasonic welding means as described above. The vibrator 21 made of
thin film plastic, which is convenient to be integrated, is formed by using an appropriate method
and material. It can be easily formed. Then, with a certain type of vibrating body 21, it is possible
to form a timbre speaker 16 having various characteristics by selecting one having a large
number of fine through holes or changing the material and thickness. The thickness of the lower
end central portion of the vibrating body 21 is 1 mm or less (the upper end portion is a coneshaped portion 22a) (this varies depending on the specification and size of the speaker 16, etc.
The field magnet 22 formed in a cylindrical shape (which may be formed to have a size of about
5 mm) is coupled so that reciprocating vibration can be made in the magnetic gap 30 in the axial
direction. It is desirable that the field magnet 22 be formed so that its axial length be longer than
the axial length of the stator voice coil 23 described later in order to obtain uniform driving
force. The radial direction (radial direction) anisotropy 1. By using, for example, a cylindrical one
formed of a neodymium-boron-iron resin magnet, it is possible to easily form one that sufficiently
satisfies the purpose of the present invention. .
In addition, anisotropic magnet is 1 magnet which performed spin orientation forcibly, generally,
by giving 1 strong magnetic field before the magnet material hardens. It can be produced. Here,
as a magnet material for forming the optimum field magnet 22, the formed field magnet 22 is
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lighter than the specific gravity of the stator voice coil 23 described later, and a strong magnetic
flux density can be obtained. Very easy things are desirable. For this reason, the field magnet 22
selected and prototyped by the inventor of the present invention has a specific gravity of about 4
so that a strong magnetic force can be obtained as a magnet and a very thin magnet can be easily
obtained. Use neodymium / boron / iron resin magnet oriented anisotropically. This is formed in
a cylindrical shape by appropriate molding means such as a mold. 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 circumference is Ni and the outer circumference is a single pole magnetized to the S pole.
The response of the field magnet 22 becomes worse as the weight of the field magnet 22
increases. Therefore, it is desirable to use a magnet that is suppressed to 3 times or less the
weight of the stator voice coil 23 described later. The two prototype speakers actually
manufactured have an axial length of 7 mm and an outer diameter of 20 mm, but one has a
radial thickness of 1 mm and a weight of 1 g, and the other has a radial thickness. The one
having a size of 0.5 mm and a weight of 0.5 g was used. And, as a stator voice coil 23 to be
described later, a voice coil 1o shown in FIG. 6 having a weight of 0.5 g and an axial length of 4
mm used in the conventional speaker 1 is substituted for an experiment. went. When 0.5 g of
voice coil 1 o is used as stator voice coil 23, field magnet 22 is Ig 0.5 g, so that field magnet 22 is
twice the weight of stator voice coil 23. It becomes equal weight. Even when any of these two
types of field magnets 22 is used, it is possible to obtain one that generates an accurate and
accurate acoustic signal. However, when the field magnet 22 is configured using a magnet
material of the type described above, a stronger magnetic flux can be obtained by using the field
magnet 22 having a thickness of 0.5 mm and a weight of 0.5 g, Good results have been obtained.
Therefore, when the conventional voice coil 10 is used as the stator voice coil 23, if the field
magnet 22 has the same weight as that of the voice coil 10, the efficient speaker 16 can be
expected. You can get it.
The field magnet 22 is held at the central portion of the magnetic pole and appropriately
supported using a damper in order to damp the vibration appropriately, and the field magnet 22
is properly held in the magnetic gap 30 of the field portion. It is even more convenient to
position it, but it is possible without it. In actual prototypes, prototypes were made without using
dampers, but there was no effect. 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 30. A stator voice coil 23 formed in a cylindrical shape is fixed to the inner
peripheral surface 18b of the yoke plate 18 by using a bonding agent, and the field magnet 22
and the magnetic gap 23 are fixed. It is made to face through. The lead wire 25 of the stator
voice coil 23 is drawn out from the through hole 26 provided in the lower part of the yoke plate
18 and led to the outside. [Second Embodiment of the Invention] FIG. 4 is an exploded
perspective view of the main part of a dynamic cone speaker 16 'according to the present
invention, and FIG. 5 is a longitudinal sectional view thereof. Referring to FIG. 4 and FIG. The
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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 16 'according to a second
embodiment of the present invention integrally forms a center ball 17' of a cup-shaped
longitudinal cross section, a yoke plate 18 'and a frame 19 DEG by pressing a magnetic material
such as an iron plate. By doing this, a stator 20 'to be a field part is formed. The center ball 17 '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 18' in order to reduce the weight and
the cost, It extends. A two cylindrical magnetic gap 30 is formed between the outer periphery of
the center ball 17 'and the inner peripheral surface of the yoke plate 18 ░. A cone-shaped frame
19 'is integrally formed on the upper end of the outer periphery of the cup-shaped yoke 18'.
Through holes 27 are formed in the frame 19 'by pressing means. Further, at the upper end
peripheral portion of the frame 19 ', a flange 29 having a through hole 28 is formed together
with a gasket (not shown) 7 in order to connect the peripheral portion of the cone-shaped
vibrating body 21' with a screw or the like. In the vibrating body 21 ? ? in this embodiment, in
order to increase the vibration efficiency, the bellows portion 31 is formed on the way.
The configuration of the other parts of the speaker 16 'is the same as that shown in the first
embodiment, so the description thereof will be omitted. Reference numeral 26 indicates a
through hole. [Operation of the Invention] In the present invention, since the principle of
operation is the same in all respects, the alternating current having a magnitude based on the
acoustic signal is supplied to the voice coil 23 in the speaker 1 when it is described with
reference to the first embodiment. Since the force oscillating back and forth along the axial
direction of the magnetic gap 30 is generated according to Fleming's left-hand rule, the field
magnet 22 oscillates back and forth along the axial direction in the magnetic gap 30. For this
reason, the vibrating body 21 fixed to the field magnet 22 vibrates, and 3i! It is possible to
generate acoustic signals of appropriate wavelength and size. [Effects of the Invention] Since the
present invention is configured as described above, the field magnet is made to move without
moving the voice coil, and the lead wire is cut due to the lead wire being oscillated and the lead
wire being cut or soldered off. There is no damage, and a reliable and long-life speaker can be
obtained. In addition, since the troublesome step of soldering both lead terminals to the vibrator
or the like can be omitted, there is an effect of being excellent in mass productivity and being
inexpensive to manufacture. Further, since it is not necessary to solder the terminal of the lead
wire to the vibrator, it is possible to mass-produce the vibrator inexpensively and easily using a
desired thin film plastic. In addition, the field magnet is composed of radial direction anisotropy
1 that has a specific gravity higher than that of the lead wire and can increase the magnetic
force, for example, neohem-boron-iron-based resin magnet material etc. Preferably, the thickness
can be made thin so as to be of the same level, so that the field magnet can generate a strong
magnetic force and the amount of use of the magnet material can be reduced. Conventionally, it
has been difficult because the speed can be increased and the audio signal can be extracted more
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accurately over a wide range. 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
length of the field magnet in the axial direction of the stator voice coil is increased to obtain
sufficient magnetic flux, the driving force can be more reliably obtained, and as a result, the voice
signal can be extracted more accurately. In particular, there is an effect that inexpensive ones can
be configured with good efficiency that can take out dynamic bass. In addition, since the field
magnet can be made small and extremely lightweight, the magnetic circuit can be configured
very easily, the magnetic path of the field magnet can be sufficiently closed, and the leakage flux
from the field magnet There is an effect that the external device of the speaker is not adversely
affected.
In addition, since a magnetic circuit can be configured to generate only a small amount of
leakage flux, the field magnet uses a neodymium-boron / iron-based resin magnet or the like that
generates a strong magnetic force with high cost per dull as compared to a ferrite magnet. Even
if the field magnet is extremely 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 small and lightweight, as a result, it is possible to form the speaker small and lightweight.
Furthermore, since there is sufficient space and there is no need to move the voice coil, 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. Since it is possible to adopt a finish winding, the twowinding production can be made extremely easy, the defect rate can be reduced, and the voice
coil can be mass produced 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 и process t for vibrating the field magnet: the number of turns
of wire winding of the wire 11 = current, the number t of turns of the wire can be made a large
value. Since the value of the current I can be reduced, there is an effect that an efficient speaker
can be obtained. And the greatest effect of the present invention which can derive the above
effect is that the vibrator formed of thin film plastic can be used extremely easily, and the
connection of the vibrator formed of thin film plastic to the field magnet Is extremely easy, so
that the speaker can be mass-produced inexpensively. Although the above embodiment of the
present invention shows an example of a speaker using a stator voice coil and a single pole field
magnet, it has a toroidal stator coil different from the stator voice coil and a plurality of poles
magnetized in the axial direction. It may be a speaker of the type using the field magnet. Further,
although the example in which the magnetic gap of the magnetic circuit is formed in a cylindrical
shape is shown in the above embodiment, it is needless to say that the magnetic circuit
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configuration in which the polygonal cylindrical magnetic gap is formed may be 1-.
[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 thereof, and FIG. 3 is
a connecting portion between a vibrating body and a field magnet FIG. 4 is an exploded
perspective view of the main part of a dynamic = 1-on speaker according to a second
embodiment of the present invention, and FIG. 5 is a longitudinal sectional view of the same.
FIG. 6 is a sectional view of a conventional dynamic cone speaker, and FIG. 7 is a partial
explanatory view of the same. "Description of the code" 1: Dynamic cone speaker. 2 ... Center ball
(central magnetic pole). 3 ... Center ball, 4 ... Permanent magnet. 5 иии Upper yoke play 1-16 иии
Field field. ????????? 8 иии Gasket arrow), 9 иии Vibrator. ????????????
?????????????????????? 13 ... magnetic gap. ????????????
? 15 иии Lead wire. ????????????????????????????? 17.17 ?...
center ball, 17 a ... perimeter. 18.18 '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 base portion,
18b и и и inner circumferential surface. 18e ... perimeter. ????? ???????? 20.20 '...
Stator, 21 ... Vibrator. 22: Field magnet. 22a ... cone-shaped part. ??????????????
?? ?????????????? 25 иии Lead wire. 26.27.28 ... through hole. 29: Flange, 30:
Magnetic air gap.
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