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JPH01258595

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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 JPH01258595
[0001]
[Industrial field of application of the invention] The present invention relates to a speaker used
for sound and the like, characterized in that the coil is fixed and the field magnet is structured to
move, and movable The weight of the body can be reduced, and as a result, the response speed
can be improved to increase the efficiency of converting the vibration into sound, and bass sound
can be easily generated. Long lead times can be expected by avoiding lead wires, and the
structure is simplified to enable mass production at low cost. 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. [Technical
background and problems] The 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 conelike paper is called a dynamic cone speaker. Many conventional dynamic cone speakers 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 the peripheral portion
of a vibrating body 9 formed of a cone-shaped fiber together with a gasket (arrowhead) 8 is
bonded to the peripheral portion of the frame 7 with an adhesive. 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
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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 fitted on the upper surface of the central portion of the
vibrating body 9 so that dust in the air does not intrude into 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 #Ji 15 of the voice coil 10 pulls its both terminals
from the top through the magnetic gap 13 and leads it to the vibrating body 9 (or the frame 7),
(1) Because of the use of the voice coil 10 whose thickness is limited in order to pass both
terminals of the lead wire 15 of the voice coil 10 into the magnetic air gap 13, only the thickness
of the lead wire 15 The magnetic flux density in the magnetic 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.
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. 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 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), the response speed is
slow, and the voice signal can not be captured 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 abovementioned 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
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
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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 large
driving force T for vibrating the voice coil 10 is. T = t и ? t: Number of turns of wire winding I: It
is given by current, but conventionally, the number of turns of wire winding t can not be made a
large value for the above reason, so a large value 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 above-mentioned 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 equipment such as the audio equipment of each kite, which tends to be densely
packed, 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. Or a large amount of expensive permanent magnet materials capable
of generating a strong magnetic force, which has promoted the defect that the speaker 1
becomes large, heavy and heavy. 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] Regarding the biggest problem of the present invention, to be
described later, when describing the other problems of the present invention, first, the concept of
the conventional speaker is completely changed and the coil is not moved, By moving the field
magnet, the task was to eliminate the breakage due to the lead wire being cut and the solder
coming off due to the coil vibrating by pulling the lead wire, and to obtain a long life and reliable
speaker It is a thing. 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 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
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magnet from becoming a large load and to generate one strong magnetic force, and to use a
magnet material that can generate such a strong magnetic force. Also, since the field magnet is
small and the 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 adopt a glass winding which does not adopt a single winding to extremely facilitate
production of a single winding, to reduce a defective rate and to mass-produce the voice coil at
low cost and easily. 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 TT = t-1t for vibrating the field magnet: the 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 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 configure the
external device so as not to adversely affect 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 that is light in weight and small in size inexpensively and easily. 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 is separated by the stator coil and the radial magnetic gap. A field
magnet is provided, in which the inner and outer surfaces are magnetized with different poles so
as to be freely movable in the axial direction, and formed of one cylindrical radial anisotropic
magnet material, and the oscillation movement of the field magnet in the axial direction This can
be achieved by integrating the vibrating body and the field magnet by extending the end of the
interlocking vibrating body and wrapping and protecting the field magnet with the extension, and
the other problems can be achieved by the vibrating body. Can be achieved by forming the thin
film plastic. [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, and FIG. 2 is a longitudinal sectional view thereof. FIG. 3 is an
enlarged view of a connecting portion of a vibrating body and a field magnet. A first embodiment
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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 formed by molding the
magnetic body 1, for example, a plastic powder-containing magnetic body. Center ball (center
magnet! ???? By integrally forming the yoke plate 18 and the frame 19. A stator 20 which is
a field portion is formed. The center pole 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. Magnetic sky 1!
It forms Ji30. 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 thin film plastic (it may be made of
paper, fibers, etc. along with a gasket not shown) may be formed on the upper end peripheral
portion of the frame 19, but in this case, an example using thin film plastic for the purpose of
improving mass productivity The peripheral portion of the cone-shaped vibrating body 21
formed in the above is connected by an adhesive, ultrasonic welding or the like. The connection
between the vibrating body 21 formed of thin film plastic and the field magnet 22 formed of a
plastic magnet further extends the lower end portion of the vibrating body 21 and wraps and
protects the field magnet 22 by the extended portion 21a. The field magnet 22 and the extension
portion 21a are integrated by using an appropriate means such as ultrasonic welding or an
adhesive, so that they can be connected and fixed to be able to vibrate integrally. Incidentally,
depending on the connecting and fixing means of the field magnet 22 and the extension portion
21a, the plastic magnet forming the field magnet 22 (note that it is not necessary to limit to the
plastic magnet, but in order to reduce the specific gravity value of the field magnet 22) In this
embodiment, a plastic magnet is used. ) May be wrapped and protected by the extension portion
21a, and then the plastic magnet may be magnetized in a predetermined manner to form the
field magnet 22. The vibrator 21 made of thin film plastic is made of a suitable 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. Although the field magnet 22 used
in this embodiment has a cone-shaped portion 22a at the top, it may be cylindrical, and its
thickness may vary depending on the specifications and size of the speaker 16, etc. The speaker
16 or the like may be formed to have a size of about 0.5 mm. The six cylindrical field magnets 22
preferably have a length in the axial direction longer than that in the axial direction of the stator
voice coil 23 described later in order to obtain uniform driving force. . By using a cylindrical one
made of, for example, a neodymium-boron-iron resin magnet having a radial direction (radial
direction) anisotropy, it is possible to easily form one that can sufficiently satisfy the purpose of
the present invention. An anisotropic magnet is a magnet in which 1 spin orientation is forcibly
performed, and in general, it can be manufactured by giving 1 strong magnetic field before the
magnet material is solidified.
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Here, as a magnet material for forming the optimum field magnet 22, the formed field magnet 22
is lighter than the specific gravity of the stator voice coil 23 described later, and a strong
magnetic flux density is obtained. Moreover, it is desirable that the material is extremely easy to
process or form. Therefore, 1) The field magnet 22 selected and prototyped by the inventor can
obtain a strong magnetic force as a magnet and easily obtain a very thin film. In order to make it
possible, use a neodymium-boron-iron resin magnet oriented in the radial direction (radial
direction) anisotropy and having a specific gravity of about 4 and form it into a cylindrical shape
by an appropriate molding means such as a mold. There is. 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 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, an experiment is conducted by substituting the
voice coil 10 shown in FIG. 6 having a weight of 0.5 g and an axial length of 4 mm used in the
conventional speaker 1. went. When 0.5 g of the voice coil 10 is used as the stator voice coil 23,
the field magnet 22 is Ig and 085 g. Therefore, the field magnet 22 is twice and one times the
weight of the stator voice coil 23, respectively. The weight of 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 performance of the more desirable stator voice coil 23 can be further improved by
shortening the axial length and reducing the weight. In this way, a large acoustic signal can be
obtained, and the weight of the speaker 16 can be reduced. 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
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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 loudspeaker 16 'according to the present invention, and FIG. 5 is a longitudinal
sectional view thereof. Referring to FIG. 4 and FIG. The second embodiment of the present
invention will be described below. ??? The same reference numerals as in the first
embodiment denote the same parts as those in the first embodiment, and a description thereof
will be omitted. A dash will be put in a corresponding part. 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 ? 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 cylindrical magnetic gap 30 is formed
between the outer periphery of the center ball 17 'and the inner peripheral surface of the yoke
plate 1-18'. 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, a flange 29 having a through hole 28 is formed on the upper end
peripheral portion of the frame 19 'in order to connect the peripheral portion of the cone-shaped
vibrating body 21' 'with a screw or the like together with a gasket (not shown).
Incidentally, in the vibrating body 21 'in this embodiment, in order to enhance 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 an acoustic signal sound of an appropriate wavelength and size can be generated. [Effect of
the Invention] Since the present invention is configured as described above, the voice coil is not
moved, and the field magnet is moved. Therefore, the lead wire is cut and the solder is removed
by the drag and vibration. 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
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desired thin film plastic. In addition, the field magnet is composed of a radial anisotropy 1 such
as neodymium / boron / iron-based resin magnet material, which has a specific gravity smaller
than that of a conducting wire and can increase the magnetic force, and is preferably 3 times or
less the weight of the stator voice coil, preferably Since the thickness can be made thin so as to
be comparable, 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 and the response
speed is fast. It has been difficult in the prior art because the audio signal can be extracted more
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 / ironbased 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, do not adopt a close-winding winding
method in which sufficient space can be accommodated, the voice coil can not be moved, and the
very troublesome wires are closely wound so as not to overlap. Since it is possible to adopt a
finish winding, it is extremely easy to manufacture the 9-winding wire, and it is possible to
reduce the defect rate and mass-produce the voice coil at low cost 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, large driving force TT for oscillating the field magnet: t и t: number of turns of
wire winding of the lead ?: In the current, the number of turns t of the conducting wire can be
made a large value, so a large driving force T is obtained Since the value of the current I can be
reduced, there is an effect that an efficient speaker can be obtained. And the maximum effect of
the present invention which can derive the above-mentioned effect utilizes a part of vibrator.
Since the field magnet is encased and protected, it is very easy to connect and fix the vibrating
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body and the field magnet. In this case, when the thin film plastic is used as the vibrating body,
the vibrating body can be extremely easily used, and the connection between the vibrating body
formed of the thin film plastic and the field magnet is extremely easy. There is an effect that mass
production can be carried out inexpensively.
Furthermore. In this way, in the case of a material that easily rusts like a neodymium / iron /
boron-based magnet agent, it is possible to prevent the occurrence of the rust and also like a rare
earth magnet agent. In the case of a material which is fragile and generates magnet powder from
its surface, there is an advantage that deterioration of the field magnet can be prevented, for
example, generation of the magnet powder can be prevented. 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 in the axial direction. It may be a speaker of a type using a magnetized field magnet.
Further, in the above embodiment, an example in which the magnetic gap of the magnetic circuit
is formed in a cylindrical shape is shown, but it goes without saying that a magnetic circuit
configuration in which a polygonal cylindrical magnetic gap is formed may be employed.
[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. FIG. 4 is an
exploded perspective view of the main part of a dynamic cone 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 longitudinal 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 ? ? ? upper
yoke plate, 6 ? ? ? field part. ????????? 8: Gasket (arrow), 9: Vibrator. ??????
?????? ?????????????????????? 13 ... magnetic gap. ??????
??????? 15 иии Lead wire. ????????????????????????????
? ????????????????? 17a ... perimeter. ?????????????????
18a: bottom surface portion, 18b: inner circumferential surface. 18c ... perimeter. ???????
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??????? 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. ? 1 2 2 ? 3 ? 4 ? 5
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