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JPH01258589

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DESCRIPTION JPH01258589
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic electroacoustic exchanger such as a speaker, a microphone, an earphone, a
telephone, etc., characterized in that the voice coil is fixed and the field magnet is fixed. The
moving structure can reduce the weight of the movable body. As a result, the response speed can
be improved to increase the efficiency of converting the vibration into sound or current, and the
sound of bass can be easily generated, and the lead wire A long life can be expected without the
drag, and the structure is simplified to enable mass production at low cost. It is an efficient
electro-acoustic exchanger. [Technical background and problems thereof], electrodynamic
electroacoustic exchanger 9, for example, a speaker is arranged so that a voice coil is movably
disposed in a magnetic field and voice current flows, the voice coil vibrates as the current
changes. It is 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. In addition, a voice coil is used to
move a small vibrator, and a horn is placed on the front of the unit to efficiently radiate sound
waves, which is called a dynamic horn speaker. Microphones, for example, dynamic microphones
are similar in structure to dynamic speakers. Conversely, when the vibrator is moved upon
receiving a sound wave, a voice coil attached to it vibrates in a magnetic field to generate an
electric current. Since all of these electrodynamic electroacoustic exchangers have the same
structure, the loudspeaker will be described below. Many conventional dynamic cone speakers 1
are configured as shown in FIG. That is, a permanent magnet consisting of a cylindrical ferrite
magnet on a yoke plate 3 provided with a center ball (central magnetic pole) 2. Similarly, a
cylindrical upper yoke plate 5 is disposed, and these are fixed by an adhesive or the like to
constitute the field portion 6 to constitute the fixed side. The field section 6 shown here is called
an external magnet type, but it may be an internal magnet type using a yoke and incorporating a
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columnar permanent magnet and a center ball at the center of the inside of the yoke. good. A
cone-shaped frame 7 is connected to the field portion 6, and a peripheral edge of the coneshaped vibrating body 9 is joined with an adhesive or the like to the peripheral edge of the frame
7 together with a gasket (arrowhead). There is.
At a central portion of the vibrating body 9, a coil bobbin 11 formed of paper, thin plastic or the
like on which a cylindrical voice coil 10 is wound at the lower portion is coupled. The middle
portion of the coil bobbin 11 holds the voice coil 10 at the center between the magnetic poles
and is supported by a damper 12 for damping the vibration appropriately, and the voice coil 10
is supported in the magnetic gap 13 of the field section 6. It is supposed to be positioned
correctly. Further, a dust cap 14 such as a dustproof cloth is attached to the upper surface of the
central portion of the vibrating body 9 so that dust in the air does not enter the annular magnetic
gap 13. According to such a conventional speaker 1, 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 1o of which thickness is
limited in order to pass both terminals of the lead wire 5 of the voice coil 10 into the magnetic
gap 13 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. In the case where the
vibrating body 9 is formed of a thin film plastic of recent years, if 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, and
the desired thin film The vibrating body 9 can not be formed of plastic, and mass production can
not be performed inexpensively. 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 About 7) is heavy, the load is large, the response speed is slow, and there is a drawback
that 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 a line so as not to be
overlapped, which is referred to as close winding in one row, or so. As described above, since the
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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 above-mentioned {circle over (1)} and {circle over (2)} is that
the resistance value of the voice coil 10 is, for example, 1 in the conventional speaker 1 etc. It is
because it is defined like 8 Ω etc. However, manufacturing the voice coil 10 in accordance with
the resistance value is very troublesome and has a drawback that the mass productivity is not
excellent. Further, as described above, since the voice coil 10 must be formed by tightly winding
in one row, a large number of turns of the lead wire can not be formed, and a large driving force
for vibrating the voice coil 10 is generated. In the case of bass, it was not possible to accurately
output an audio signal. Also, especially when trying to put out the bass precisely, it becomes very
accurate. It was not possible to form a speaker or the like capable of producing a low-pitched
sound with high accuracy. The large driving force T for vibrating the voice coil 10 is. T = t ·
Process t: Number of turns of wire winding ■: Lightning current is given, but 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 it may adversely affect various
kinds of audio equipment which tends to be mounted in high density.
In addition, since a large permanent magnet 4 must be exposed and mounted as described above,
a considerable amount of the magnetic flux of the permanent magnet 4 leaks, so the speaker 1
becomes inefficient and a large and heavy permanent magnet is used. 1) A large amount of
expensive permanent magnet materials capable of constituting a strong magnetic force has to be
used, which promotes the drawback of the speaker 1 being large, heavy and heavy. SUMMARY
OF THE INVENTION The object of the present invention is to completely change the concept of
the conventional electrodynamic electroacoustic exchanger, and to move the field magnet
without moving the voice coil. It is an object of the present invention to provide a highly reliable
electrodynamic electroacoustic exchanger that has a long life and is free from breakage due to
lead wire breakage due to lead wire vibration due to the voice coil dragging. In 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 voice coil is not moved so that the lead wire does not come in contact with the fixed side, and
a magnet material having a specific gravity smaller than that of the lead as a field magnet (for
example, specific gravity 4) (1), and it is possible to lighten the weight of the vibrator, to make
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the response speed faster, and to be able to extract the audio signal 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. すなわち。 Since the system of
moving the field magnet is used, it is possible to prevent the field magnet from becoming a large
load and to generate two strong magnetic forces, and even if using a magnet material which can
generate such strong magnetic force, It is an object of the present invention to make it possible
to construct a field magnet at low cost by making the field magnet small and light in weight. In
addition, by making the voice coil not to move, it is possible to adopt a glass winding which does
not require the closely wound winding method of closely winding in one row so that very
troublesome wires do not overlap. In this way, it is an object of the present invention to make
manufacturing of a single winding extremely easy, reduce the defect rate, and enable the voice
coil to be mass-produced inexpensively and easily. Of course, according to the present invention,
the voice coil of the conventional speaker may be used as it is, and the voice coil can be
configured to have a sufficient space to accommodate the multi-turn wound voice coil. By making
it possible to generate a large driving force for vibrating the field magnet by using a voice coil in
which a large number of turns of a lead wire are formed so that a dense winding is not required
to be formed in one row. In this case as well, it is an object of the present invention to make it
possible to collect an accurate audio signal.
By doing this, a large driving force for vibrating the field magnet TT = t · t: number of turns of
wire winding I: in the current, the number of turns of wire winding t becomes a large value By
forming it, it is possible to obtain a large driving force T, and also to make it possible to reduce
the value of current ■, so that an electrodynamic electroacoustic exchanger such as an efficient
speaker can be obtained. Was made an issue. Furthermore. By simplifying the magnetic circuit
configuration. By making the leakage flux of the field magnet extremely small, the external
equipment is not adversely affected by the leakage flux of the field magnet, and the magnetic
circuit can be made small, so that it is light in weight and small in size. It is an object of the
present invention to make it possible to configure the system inexpensively and easily. [Problem
to be achieved by the invention of the present invention] The subject of the present invention is
to provide a stator voice coil formed in a tubular shape in a cylindrical magnetic gap of a
magnetic circuit in a fixed manner, and interposing the stator voice coil and the magnetic gap in
the radial direction. A field formed by a cylindrical unipolar radial anisotropy neodymium-boroniron-based resin magnet in which inner and outer surfaces are magnetized to different poles so
as to be movable in the axial direction in the magnetic gap. This is achieved by providing a
magnet and providing directly or at intervals a vibrating member that is interlocked or abutted
by axial vibrational movement of the field magnet. [Embodiment of the Invention] [First
Embodiment of the Invention] FIG. 1 is an exploded perspective view of a dynamic cone speaker
16 of the present invention with a part cut away, and FIG. 2 is a longitudinal sectional view of the
same. is there. The first embodiment of the present invention will be described below with
reference to FIGS. 1 and 2. A dynamic cone speaker 16 according to a first embodiment of the
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present invention is formed by molding the magnetic body 2, for example, a plastic powdercontaining 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 formed integrally with 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. An outer peripheral portion of a cone-shaped vibrating body 21
is joined to an upper end peripheral portion of the frame 19 by an adhesive or the like together
with a gasket (not shown).
The thickness of the lower end central portion of the vibrating body 21 is 1 mm or less (the
upper end portion is a cone-shaped portion 22a) (this varies depending on the specification and
size of the speaker 16, etc. 0 cylindrical field magnet 22 which is coupled with a cylindrical field
magnet 22 of about 5 mm and is capable of reciprocating oscillation in the axial direction in the
magnetic gap 30 By using a cylindrical one made of a neodymium-boron-iron-based resin magnet
with radial direction, radial direction, and radial direction, 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. Here, as a magnet
material for forming the f & suitable field magnet 22, the field magnet 22 to be formed has a
magnetic flux density lighter than the specific gravity of the stator voice coil 23 described later,
and a strong magnetic flux density is obtained. It is desirable that things be extremely easy,
therefore 1 the field magnet 22 selected by the inventor for trial production. A neodymiumboron-iron-based resin oriented in the radial direction (radial direction) with a specific gravity of
about 4 so that a strong magnetic force can be obtained as a magnet and a very thin one can be
easily obtained. Using a magnet, it is formed in a cylindrical shape by molding means. The field
magnet 22 is magnetized in a single pole so as to have different poles on the inner and outer
peripheries since the magnetic field magnet 22 is in the radial direction and 9 magnetization
directions are regulated. 91 In this embodiment, the inner periphery is a single pole with the N
pole and the outer periphery a S pole. The field magnet 22 has an axial length of 7 mm for both
of the actually manufactured two types of speakers. An outer diameter of 20 mm was used, one
having a thickness of 1 mm in the radial direction and a weight of 1 g, and the other having a
thickness of 0.5 mm in the radial direction and a weight of 0.5 g. 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.
Even when any of these two types of field magnets 22 is used, it is possible to obtain one that
generates an acoustic signal accurately. The middle portion of the field magnet 22 holds the field
magnet 22 at the center of the magnetic pole and is supported by a damper (not shown) for
applying appropriate damping (damping) to the vibration, and the field magnet 22 is The
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magnetic gap 30 is properly positioned.
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. The
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 lead wire 25 of the stator voice coil 23 is
fixed. Are led 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. 3 is an exploded perspective view
of the main part of a dynamic cone speaker 16 'according to the present invention, and FIG. 4 is a
longitudinal sectional view thereof. Referring to FIGS. 3 and 4. Second Embodiment A second
embodiment of the present invention will be described below. なお。 The same reference
numerals as in the first embodiment denote the same parts as in the first embodiment, and a
description thereof will be omitted. The dynamic cone speaker 16 ° according to the second
embodiment of the present invention integrally forms a center ball 17 ′ of a longitudinal cross
section cup type, a yoke plate 18 ′ and a frame 19 ° by pressing means or the like with a
magnetic body 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 3 ° is formed between the
outer periphery of the center ball 17 'and the inner peripheral surface of the yoke plate 18'.
Then, a cone-shaped frame 19 ° is integrally formed at the upper end portion of the outer
periphery of the cup-shaped yoke 18 °. Through holes 27 are formed in the frame 19 ′ ′ by
pressing means. At the upper end peripheral portion of the frame 19 ′ ′, two flanges having
through holes 28 are formed together with a gasket (not shown) for connecting the peripheral
portion of the cone-shaped vibrating body 21 ′ with a screw or the like. In addition, at the
vibrator 21 ° in this embodiment, in order to enhance the vibration efficiency, the bellows part
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. [Third Embodiment of the Invention] In the third
embodiment, referring to FIG. 5, the vibrator 21 ′ ′ and the field magnet 22 are
simultaneously molded by two-color molding of plastic and plastic magnet. Or, one of them is
molded first and then the other is molded to be integrated. In FIG. 5, it is needless to say that the
vibrator 21 ′ ′ is made of plastic.
[Function of the Invention In the present invention, since the principle of the operation is the
same, if an explanation is given with reference to the first embodiment, alternating current of a
magnitude based on an acoustic signal is supplied to the voice coil 23 in the speaker 1 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
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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. It is possible to obtain a highly reliable and longlived electrodynamic electroacoustic exchanger without damage. 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, since the field magnet is made of a neodymium-boron-iron resin magnet material of
radial anisotropy which has a specific gravity smaller than that of the lead wire and can increase
the magnetic force, the field magnet can generate a strong magnetic force and Since the amount
of use of the magnet material can be small, the weight of the vibrator can be reduced, the
response speed can be increased, and an audio signal can be extracted more accurately over a
wide range, which is difficult in the related art. In particular, there is an effect that it is possible
to construct inexpensive ones with high efficiency that can take out dynamic bass. 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 field magnet can form a magnetic circuit so that only a
small amount of leakage flux is generated, the field magnet can be used even if the neodymiumboron / iron-based resin magnet, which has a higher cost per dull, is used compared to the ferrite
magnet. Since the thickness is very thin and the weight is light, the amount of use of the magnet
material constituting the field magnet is small, so that the field magnet can be formed
inexpensively.
In addition, the magnetic circuit including the field magnet is simple. As a result of being able to
be formed in a small size and light weight, there is an effect that an electrodynamic
electroacoustic exchanger such as a speaker can be formed in a small size and light weight.
Furthermore, since there is sufficient space and the voice coil does not move, it is not necessary
to adopt a close-winding method in which the very troublesome wires are closely wound in a row
so as not to overlap. The use of the glass winding makes the single-winding production extremely
easy, and the defect rate can be reduced, and the voice coil can be 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
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force TT = t ·· t for vibrating the field magnet: the number of turns of wire winding of the lead ■
= current, the number t of turns of the conducting wire can be made a large value. Since the
value of the current I can be reduced, it is possible to obtain an electrodynamic electroacoustic
exchanger such as an efficient speaker. Although the embodiment of the present invention has
mainly described the speaker, the present invention is naturally applicable to an electrodynamic
electroacoustic exchanger such as a microphone having a common structural principle.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an exploded perspective view of a dynamic cone speaker according to a first
embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the dynamic
cone speaker according to the second embodiment of the present invention. FIG. 4 is an exploded
perspective view of the main part of the dynamic cone speaker, FIG. 4 is the same longitudinal
sectional view, FIG. 5 is a partial explanatory view for explaining the third embodiment of the
present invention, and FIG. FIG. 7 is a longitudinal sectional view of the 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. 7・・・フ
レーム。 8: Gasket (arrow), 9: Vibrator. 10・・・ボイスコイル。 11・・・コイルボビン、
12・・・ダンパー。 13 ... magnetic gap. 14・・・ダストキャップ。 15 ··· Lead wire.
16.16 、16 ′・・・ダイナミック・コーン・スピーカ。 17.17 ・・・センター
ボール。 17a ... perimeter. 18.18 ・・・ヨークプレート。 18a: bottom surface portion,
18b: inner circumferential surface. 18c ... perimeter. 19.19 ・・・フレーム。 20.20 '...
Stator. 21.21 '· · · Vibrator. 22: Field magnet. 22a ... cone-shaped part. 23・・・ステータボイス
コイル。 24・・・ダストキャップ。 25 ··· Lead wire. 26.27.28 ... through hole. 29: Flange, 30:
Magnetic air gap.
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