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JPH01258594

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DESCRIPTION JPH01258594
[0001]
[Industrial field of application of the invention The present invention relates to a speaker,
characterized in that the voice coil is fixed and the field magnet is moved, so that 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 or current is enhanced, the sound of bass can be easily
generated, and the long life can be expected without the lead wire being dragged, and the
structure We made it easy and inexpensive to mass-produce. It has become an efficient speaker.
Especially in the case of one inventive speaker, separately conventionally. It is possible to massproduce easily and inexpensively by preventing dust from entering the magnetic gap without
providing a dust cap for preventing the dust from entering the magnetic gap of the magnetic
circuit attached to the vibrator. It relates to the speaker which did. [Technical background and
problems thereof] 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 with a coil is called a dynamic
speaker. And a coil which is directly connected to a circular i <cone) paper or the like to emit a
sound wave is called a dynamic cone speaker. Many conventional dynamic cone speakers 1 are
constructed 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
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cylindrical voice coil 10 is wound at the lower portion is coupled. The middle portion of the coil
bobbin 11 holds the voice coil 10 at the center between the magnetic poles and is supported by a
damper 12 for damping the vibration appropriately, and the voice coil 10 is supported in the
magnetic gap 13 of the field section 6. It is supposed to be positioned correctly.
Further, a dust cap 14 such as a dustproof cloth is attached to the upper surface of the central
portion of the vibrating body 9 so that dust in the air does not enter the annular magnetic gap
13. According to such a conventional speaker 1, 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 1.3 and leads it to the vibrating body 9 (or may
be the frame 7), (1) Since the voice coil 10 with a limited thickness is used in order to pass both
terminals of the lead wire 15 of the voice coil 10 into the magnetic gap 13 because of the
soldering at the position, only the thickness of the lead 1115 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 disadvantage 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 as 7 for
example 8 .OMEGA. However, manufacturing the voice coil 10 in accordance with the resistance
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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 large driving force T for vibrating the voice coil 10 is. T = t и и t:
number of turns of wire winding I: given by current, conventionally, since the number of turns of
wire winding t can not be made large for the above reason, as described above, it is large 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 devices such as various audio devices tending to be highly densely
mounted may be adversely affected. In addition, since a large amount of magnetic flux of 1
permanent magnet 4 leaks because large permanent magnet 4 must be exposed and mounted as
described above, the speaker 1 becomes inefficient and a large and heavy permanent magnet is
used. Or two expensive permanent magnet materials capable of generating a strong magnetic
force must be used in multiples, which has promoted the drawback that the speaker 1 becomes
large and heavy, and also expensive. Further, among the above-mentioned drawbacks,
particularly in the conventional speaker 1, a dust cap must be provided separately in the central
portion of the conventional speaker 1 in order to avoid an adverse effect due to dust entering the
magnetic gap of the magnetic circuit. There is a drawback that the number of steps is increased.
[Section B of the Invention] The object of the present invention is to make the vibrator double as
a dust cap without providing a separate dust cap in order to prevent dust from entering the
magnetic gap of the magnetic circuit. Therefore, it is the biggest challenge to reduce the number
of parts and to be able to mass-produce speakers at low cost. Other issues are as follows. The
concept of the conventional speaker is completely changed, the coil is not moved, and the field
magnet is moved, so that the breakage of the lead wire due to the coil vibrating due to the drag
of the lead wire and breakage due to solder detachment is eliminated. The task was to obtain a
reliable speaker with a long life. 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. Further, in the subject of the present invention, the coil is not moved so that the wire
does not come in sliding contact with the fixed side, and the magnet material having a specific
gravity smaller than that of the lead as a field magnet (for example, specific gravity) (4) By using
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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 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 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 two-wire winding extremely easily by making it possible to adopt a glass winding which
does not adopt the above, and to reduce the defective rate so that the voice coil can be massproduced inexpensively 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 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 doing this, it is an object of the present invention
to obtain an efficient speaker by making it possible to obtain a large driving force T and to make
it possible to reduce the value of the current processing. 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
inexpensively and easily with a light weight. The second 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 the present invention] The subject of the present invention is to provide a stator coil
formed in a cylindrical shape in a cylindrical magnetic gap of a magnetic circuit in a fixed
manner and A cylindrical field magnet is provided whose inner and outer surfaces are
magnetized to different poles so that the magnetic gap can move in the axial direction freely, and
the end of the vibrating body interlocked by the axial vibration movement of the field magnet
This object is achieved by forming a dust intrusion preventing part that extends the part to
prevent dust from entering the magnetic gap of the magnetic circuit, and the other object is that
the vibrator is made of plastic and its lower end is This can be achieved by forming a dust
intrusion preventing portion which is connected and fixed to the magnet and extends the end of
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the vibrating body to prevent dust from entering the magnetic gap of the magnetic circuit. [First
Embodiment of the Present 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 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 comprises a
magnetic body 2, for example, a plastic powder-containing magnetic body molded by 7 center
balls (central magnet 1) 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 1/18. A magnetic 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. In this case,
the lower end portion of the plastic constituting the vibrating body 21 may be extended and
closed to form a dust intrusion preventing portion, and the dust intrusion preventing portion may
be cylindrical. It is very convenient to prevent the entry of dust into the magnetic gap 31 of the
magnetic circuit by closing the upper part of the field magnet 22 in the shape of a circle.
However, here, an example according to the first order method is shown. The end portion of the
vibrating body 21 formed of thin film plastic is further extended, and the lower end opening
portion is closed to form the dust intrusion preventing portion 21a. The outer periphery of the
dust intrusion preventing portion 21a, that is, the lower end portion of the vibrating body 21,
and the end portions of the field magnet 22 are connected and fixed by an appropriate means
such as an adhesive or ultrasonic welding. In the example shown in FIG. The vibrating body 21
formed of thin film plastic and the field magnet 22 formed of a plastic magnet are integrated by
using ultrasonic welding means. As described above, the dust intrusion preventing portion 21a is
formed by extending a part of the vibrating body 21 so that the upper opening end of the field
magnet 22 is closed by the dust intrusion preventing portion 21a, whereby the magnetic gap 30
of the magnetic circuit is obtained. It is possible to prevent dust from entering inside. 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 2 It is convenient to unify
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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. The lower end central portion of the vibrating body
21 has a cone-shaped portion 22a at the upper end and has a thickness of 1 mm or less. This
differs depending on the specification and size of the speaker 16; 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 neodymiumboron-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 lighter than the specific gravity of the stator voice coil 23
described later and 2 strong magnetic flux density can be obtained, and further processing or
formation Very easy things are desirable. For this reason, the field magnet 22 prototyped by the
inventors of the present invention has a specific gravity of about 4 so that a strong magnetic
force can be obtained as a magnet and an extremely thin magnet can be easily obtained.
Directional orientation) 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 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 the 0.5 g voice coil 10 is used as the stator voice coil 23,
since the field magnet 22 is Ig 0.5 g, the field magnet 22 has twice the weight of the stator voice
coil 23, respectively. 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
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of 0.5 mm and a 2 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. 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 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 is integrally formed with a cupshaped center ball 17', a yoke plate 18 'and a frame 19' 'of magnetic material such as iron plate
by pressing means or the like. By doing this, a stator 20.degree. Serving as a field portion 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 18'. A
cone-shaped frame 19 'is integrally formed on the upper end of the outer periphery of the cupshaped yoke 18' '. Through holes 27 are formed in the frame 19 'by pressing means. At the
upper peripheral edge of the frame 19 ', two flanges having through holes 28 are formed
together with a gasket (not shown) in order to connect the peripheral edge of the cone-shaped
vibrating body 21 "with a screw or the like. Incidentally, 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, and thus the description thereof is 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
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reason, the vibrating body 21 fixed to the field magnet 22 vibrates! It is possible to generate
acoustic signals of appropriate wavelength and size. [Effects of the Invention] As is apparent from
the above-described configuration, the present invention extends the vibrating body and
interposes the upper opening end of the cylindrical field magnet, thereby providing a separate
dust cap, Fewer v4 components as it prevents dust from entering the magnetic gap of the
magnetic circuit. There is an effect that mass production of speakers can be configured
inexpensively. Further, the speaker of the present invention has the above configuration. The
voice coil is not moved, and the field magnet is moved. Therefore, there is no breakage due to
lead wire breakage or solder detachment due to vibration by dragging the lead wire, and a
reliable and long-life speaker is obtained. be able to. 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 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. Further, 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 captured more
accurately. In particular, there is an effect that it is possible to construct inexpensive ones with
good efficiency that can extract dynamic bass in particular. 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 the magnetic circuit can be configured to generate only a small amount of leakage
flux in the field magnet material, a neodymium-boron / iron-based resin magnet or the like is
used which generates a strong magnetic force at a high cost per durum 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 in a small size and light weight, there is an effect that the skiby force 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
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troublesome wires are closely wound in a row so as not to overlap. The use of the glass winding
makes the manufacture of the 9-winding wire extremely easy, and the defect rate is reduced, so
that the voice coil can be mass-produced inexpensively and easily. Furthermore. Since the field
magnet can be made of a magnet material that can generate a strong magnetic force even if the
N-value is thin (especially, recent technologies make this possible) and a voice coil wound with
many turns can be used, A voice coil with a large number of turns can be used to generate a large
driving force for vibrating the field magnet, so that accurate voice signals can be extracted even
in the case of bass. effective.
In other words, large driving force TT for oscillating the field magnet = t и и t: number of turns of
wire winding of the lead ? = in the lightning current, the number of turns t of the conducting
wire can be a large value. Since it can be obtained and 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 Pt film plastic formed vibrator can be used
extremely easily, and the vibrator formed of the FitH plastic and the field magnet Since the
connection is extremely easy, 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 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 cross-sectional view of the same edge, 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
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partial explanatory view of the same. [Explanatory note on the symbol 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. ???????
??????? 20.20 ░ ... Stator, 21 ... Vibrator. 21a ... dust intrusion prevention unit. 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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