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JPH0256199

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DESCRIPTION JPH0256199
[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, a buzzer and the like, characterized in that it can be formed to be extremely thin,
compact and lightweight. In addition to the point, the coil is fixed and the permanent magnet
moves, and the weight of the movable body can be reduced. As a result, the response speed is
improved to convert the vibration into sound or current. In addition, it is possible to easily
generate low-pitched sound and avoid the lead wire, so that a long life can be expected, and the
structure can be simplified and the mass production can be performed inexpensively. It is an
efficient electrodynamic electroacoustic exchanger. [Technical background and problems thereof]
Electrodynamic electroacoustic exchanger 1 For example, when a voice coil is movably disposed
in an annular magnetic field and a voice current flows, the voice coil vibrates as the current
changes. The In this case, a speaker that reproduces a sound wave by moving a vibrating body
with a coil is called a dynamic speaker. And what directs a coil to a cone (cone) -like paper etc.
and radiates an acoustic wave is called a dynamic cone speaker. A voice coil is used to move a
small vibrator, and a horn is attached to the front of the vibrator to radiate sound waves
efficiently, which is called a dynamic ping speaker. Microphones, for example, dynamic
microphones have the same structure as dynamic speakers, but when the vibrator receives the
sound wave and moves the vibrator, the voice coil attached to it vibrates in the magnetic field to
generate the current. It is. Since all of these electrodynamic electroacoustic exchangers have the
same structure, the speaker will be described below. A number of dynamic cone speakers 1 of
6e′′l = are configured as shown in FIG. That is, a permanent magnet consisting of cylindrical
ferrite magnet 1 to yoke plate 3 provided with center pole (center magnetic pole) 2. Similarly, a
cylindrical upper yoke plate 5 is disposed, and these are fixed with an adhesive or the like to
constitute the field portion 6 to constitute the fixed side. Although the field section 6 shown here
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is called an external magnet type, even if it is a so-called internal magnet type using a yoke and
incorporating a columnar permanent magnet and a center pole at the center of the inside of this
yoke. good. A cone-shaped frame 7 is connected to the field portion 6, and the peripheral portion
of the cone-shaped vibrating body 9 together with a gas keg 1- (arrow) is attached to the
peripheral portion of the frame 7 by an adhesive or the like. It is connected.
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 magnetic poles and is
supported by a damper 12 for applying appropriate damping (vibration) to vibration, and the
voice coil 10 is formed into an annular magnetic gap of the field section 6 It is made to position
correctly in 13. In addition, a dust cap 1 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 intrude into
the magnetic gap 13. According to such a conventional speaker 1, the magnetic circuit, that is,
the field section 6 has a gap structure in the radial direction, so that there is a drawback that it
becomes extremely long and large in the axial direction. In addition, due to such a structure, the
structure becomes complicated, and it is impossible to mass-produce light-J short and small
(speaker suitable for rattan inexpensively and easily. Also, according to the iiC speaker 1, since
the voice coil 10 or the lead wire is vibrated by dragging, depending on long-term use, the lead
wire may be cut or the lead wire may be detached due to solder breakage. There was a drawback
that the life span was shortened. Further, the lead wire (not shown) of the voice coil 10 is drawn
out from the top through the magnetic gap 13 from its both terminals, led to the vibrating body
9 (or may be the frame 7) and soldered at that position. (1) By using the voice coil 10 with a
limited thickness in order to pass both terminals of the lead wire of the voice coil 10 into the
magnetic gap 13; The magnetic flux density in the magnetic air gap 13 can not be increased by
the thickness of the lead wire, resulting in poor efficiency. ■ In order to pass both terminals of
the lead wire of the voice coil 10 into the magnetic gap 13 and to solder both terminals of this
lead wire to the vibrating body 9 etc. It had become. ■ If the vibrating body 9 is formed of the
thin film plastic of the present, when the terminal of the lead wire is soldered to this, the hole is
made clear by heat at that time, the defect rate increases, and the vibrating body is a desirable
thin film plastic. 9 could be formed, but could not be mass-produced inexpensively. ■ There is a
possibility that the lead wire contacts with the fixed side at the time of vibration of the lice voice
coil 10 passing through both terminals of the lead wire of the voice coil 10 in the magnetic gap
13. The defect rate was also very high.
In the case of the conventional speaker 1, since the voice coil] 0 vibrates, the wire constituting
the voice coil 10 has a heavy specific gravity (specific gravity of copper is about 7) and a heavy
load, The response speed is slow and there is a drawback that the acoustic signal can not be
extracted more accurately over a wide range. In particular it was not enough to take out dynamic
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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 row of closely-wound (or referred to as aligned) 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 has a
drawback that the speaker 1 has a low rate. It was very troublesome and had a defect that was
not good for mass production. Further, as described above, since the voice coil 1o 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 1 ° is generated. In the case of bass,
it was not possible to output an audio signal accurately. 2 In particular, when trying to put out
the bass with high accuracy, it becomes very accurate. It has not been possible to form a speaker
or the like that can produce low-cost, high-precision bass. Note that the driving force T for
vibrating the voice coil 1o is T = t, and the number of turns of the conductor is given lightning
current, but conventionally, the winding turn number t of the conductor has a large value for the
above reason As described above, it is not possible to obtain a large driving force as described
above, but the value of current ■ also increases, and there is a drawback that the speaker 1
becomes inefficient. [Problems of the Invention] The problem of the present invention is to
completely change the concept of the conventional electrodynamic electroacoustic exchanger,
and first of all, the magnetic circuit (field part) has a flat structure which is simple and
inexpensive. By making an axial air gap type structure in which a coil for generating vibration
force is wound around a T-shaped salient pole having a single-pole permanent magnet and a pole
piece, it is possible to form an extremely thin magnetic circuit. Was made to the task.
It is another object of the present invention to increase the magnetic flux density between
magnetic gaps by using the above-mentioned magnetic pole pieces, to exert a large vibrational
force and to improve the vibration velocity so that an accurate acoustic signal can be generated
or received. Similarly, the concept of the conventional electrodynamic electroacoustic exchanger
is completely changed, the coil is not moved and the permanent magnet is moved so that the coil
cuts the lead wire by vibrating the lead wire. [Problems of the Invention] The problem of the
present invention is to completely change the concept of the conventional electrodynamic
electroacoustic exchanger, and first of all, the magnetic circuit (field part) is a flat single pole of a
structure which becomes extremely simple and inexpensive. It is possible to make the thickness
of the magnetic circuit thin by using an axial air gap type structure in which a coil for generating
vibration force is wound around a T-shaped salient pole having a permanent magnet and a pole
piece of It was an issue. It is another object of the present invention to increase the magnetic flux
density between magnetic gaps by using the above-mentioned magnetic pole pieces, to exert a
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large vibrational force and to improve the vibration velocity so that an accurate acoustic signal
can be generated or received. Similarly, the concept of the conventional electrodynamic
electroacoustic exchanger is completely changed, the coil is not moved and the permanent
magnet is moved so that the coil cuts the lead wire by vibrating the lead wire. It is not necessary
to use an expensive voice coil formed by a closely wound winding (also referred to as alignment
winding) method in which very troublesome wires are closely wound in a row so that
troublesome wires do not overlap. The object is to make it possible to adopt a coiled wire
winding method which makes it possible to make single-winding production extremely easy,
reduce the defect rate, and enable mass production of the electrodynamic electroacoustic
exchanger at low cost and easily. It is a thing. [Problem to be achieved by the invention of this
invention] The object of the invention is to provide a lead on the outer periphery of the center
pole of a T-shaped salient pole having a pole piece facing in parallel with the magnetic gap of a
magnetic circuit having an axial magnetic gap A single-pole flat permanent magnet, in which the
vibration force generating coil formed with the same number of turns right is fixed, and the
upper surface and the lower surface are magnetized to different poles via the magnetic pole
piece and the axial magnetic gap The magnetic gap is provided so as to be able to reciprocate in
the axial direction so as to be oscillated in the axial direction, and a vibrator that interlocks or
abuts with the permanent magnet in the axial direction is provided directly or at intervals to the
permanent magnet. FIG. 1 is an exploded perspective view of the main part of a dynamic cone
speaker 15 according to the present invention, and FIG. 2 is a longitudinal sectional view of the
same.
One embodiment of the present invention will be described below with reference to FIGS. 1 and
2. FIG. A dynamic cone speaker 15 according to an embodiment of the present invention is
formed by integrally forming a cup-shaped stator yoke 17 having a cup-shaped concave portion
16 and a frame 18 by pressing means or the like with a magnetic body 2 such as an iron plate.
One stator is formed as a field section. The stator yoke 17 is integrally formed at a central
portion of the stator yoke 17. In the drawing, a T-shaped salient pole 20 having a pole piece 20a
formed on the top of a center pole 20b projecting upward and formed to collect magnetic flux
from a permanent magnet 25 described later is fixed by an appropriate means. Further, through
holes 21 are formed in a plurality of places in the frame 18. A flange 23 having a through hole
22 for fixing the speaker 15 on the fixed side with a screw or the like is formed on the peripheral
edge of the four corners of the upper end of the cone-shaped frame 18 integrally formed on the
upper end of the cup-shaped four portion 16 The peripheral portion of the cone-shaped vibrating
body 24 is joined by an adhesive or the like together with a gasket (not shown). The flat disc-like
axial thickness is about 1 mm or less at the center of the lower end of the vibrating body 24 (this
varies depending on the specifications and size of the speaker 15, but Q and 5 mm for small
speakers 15 etc. The permanent magnet 25 formed on the base is coupled, and in the magnetic
circuit 26, reciprocating vibration can be performed in the axial direction. Although the diskshaped permanent magnet 25 can easily form a magnet which can satisfy the purpose of the
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present invention by an appropriate magnet material and an appropriate forming method
thereof, the permanent magnet 25 has an upper surface and a lower surface. And are magnetized
so as to have different polarities. That is, the permanent magnet 25 of this embodiment has a
single-pole structure in which the upper surface is magnetized to the N pole and the lower
surface is magnetized to the S pole. Here, as a magnet material for forming the optimum
permanent magnet 25, for example, the permanent magnet 25 formed is lighter than the specific
gravity (generally specific gravity is about 7) of the flat air-core type vibration force generating
coil 28 described later (1) It is desirable to have a strong magnetic flux density and be extremely
easy to process or form. For this reason, the permanent magnet 25 selected by the inventor of
the present invention and prototyped is a neodymium having a specific gravity of about 4 to 6 so
that a strong magnetic force can be obtained as a magnet and a very thin magnet can be easily
obtained. · Using a resin magnet made of poron or iron (including components other than these
three components), this is formed into a disk shape by molding means and magnetized in the
axial direction, It is selected.
An intermediate portion of the permanent magnet 25 holds the permanent magnet 25 in an
appropriate magnetic circuit 26 and is supported by a damper (not shown) for applying
appropriate damping (braking) to the reciprocating vibration of the permanent magnet 25. The
position 25 is properly positioned within the magnetic gap 27 in the axial direction of the
magnetic circuit (field portion) 26. Further, a dust cap 14 such as a dustproof cloth is attached to
the central portion of the vibrating body 24 so that dust in the air does not intrude into the
magnetic gap 27. On the outer periphery of the center pole 20b of the T-shaped salient pole 20,
a conductor wire is wound appropriately and the number of turns is wound so as to wind and fix
the vibration force generation coil 28, and the leads of the vibration force generation coil 28 The
wire 29 is drawn out from the through hole 30 provided in the peripheral wall 17 b of the stator
yoke 17 and led to the outside. In addition, T-shaped thrust f! It is more convenient to provide a
good conductor metal such as copper or aluminum on the surface facing the permanent magnet
25 in order to improve the response. [Operation of the Invention] In the speaker 15 as an
electrodynamic electroacoustic exchanger exemplified in the present invention, when an
alternating current of a magnitude based on an acoustic signal is supplied to the vibration force
generating coil 28, according to the law of the electromagnetic woofer Since a force oscillating
back and forth along the axial direction of the magnetic gap 27 is generated, the permanent
magnet 25 oscillates back and forth in the magnetic gap 27 along the axial direction. For this
reason, the vibrating body 24 fixed to the permanent magnet 25 vibrates, and an acoustic signal
sound of an appropriate wavelength and size can be generated. Although the frame 18 and the
stator yoke 17 are integrally formed in the above example, they may be separately formed and
connected and fixed to each other, or may be vibrating at the center pole 20b of the stator yoke
17 separated from the frame 18 The generating coil 28 may be wound using a winding machine.
However, an air core type vibration force generating coil 28 as shown in FIG. 1 is formed in
advance, and mounted on the outer periphery of the center ball 20b from the lower end of the
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center ball 20b. It may be fixed to the stator yoke 17 by an appropriate means. Alternatively, the
stator yoke 17 and the T-shaped salient pole 20 are integrally formed with only the one diskshaped bottom 17b of the shape obtained by removing the two peripheral walls 17a, and the coil
28 for generating vibration force is wound on the center pole 20b. Alternatively, the frame 18
integrally formed with the stator yoke 17b and the two peripheral walls 17a may be integrally
formed by an appropriate means. [Effects of the Invention] As apparent from the above
configuration, according to the present invention, since the permanent magnet and the pole piece
of the T-shaped salient pole are disposed opposite to each other via the magnetic gap in the axial
direction, the permanent magnet is attached to the pole piece The magnetic flux of the magnetic
flux can be efficiently collected, and therefore the magnetic flux density in the magnetic gap can
be increased. By energizing the coil for vibrational force generation, a large vibrational force and
responsive vibrational force can be obtained, which is extremely high. There is an effect that it is
possible to obtain an inexpensive electrodynamic electroacoustic exchanger along with a
reduction in thickness and a reduction in thickness in the axial direction while being a
performance.
In addition, since the permanent magnet is made to move without moving the coil, the lead wire
is dragged, so it does not use a troublesome and expensive voice coil or the like which increases
the size of the electrodynamic electroacoustic exchanger. It is possible to obtain a highly reliable
and long-lived electrodynamic electroacoustic exchanger without breakage due to lead wire
breakage due to vibration or solder detachment. In addition, since the troublesome process of
soldering both lead wires to the diaphragm etc. can be omitted, mass productivity is excellent.
There is an effect that can be manufactured inexpensively. In addition, since it is not necessary to
solder both terminals of the lead wire to the vibrator, it is possible to use a vibrator made of thin
film plastic, and it is possible to adopt parts and mass production processes which are
inexpensive as a whole. In addition, since the permanent magnet (specific gravity 4 to 6) can be
made small and lightweight by being composed of a magnet material that can strengthen the
magnetic force, the weight of the vibrator becomes lighter, the response speed becomes faster,
and acoustics more accurately over a wide range. It can be taken out with the signal.
Furthermore, since sufficient space for winding the vibration force generation coil can be
accommodated and the coil can not be moved, the wires which are very difficult to manufacture
are closely wound in one row so as not to overlap. Since it is not necessary to use an expensive
voice coil, it is extremely easy to manufacture the winding of the coil, there is an effect that the
defect rate can be reduced and the coil can be mass-produced inexpensively and easily.
Furthermore. The axial air gap type magnetic circuit configuration makes it possible to form the
electrodynamic electroacoustic exchanger extremely thin and to expand its application field. Also,
even if a permanent magnet capable of forming a thin magnetic circuit in the axial direction as
described above is used, such a permanent magnet can generate a strong magnetic force even if
the thickness is thin (in particular, recent technologies enable this) Since the vibration force
generating coil can be wound with a large number of turns of the conductive wire because it can
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be formed of a material, a large driving force for vibrating the permanent magnet is generated
using a coil formed by winding the conductive wire with a large number of turns. It was difficult
in the past. In particular, there is an effect that an electrodynamic electroacoustic exchanger with
high efficiency capable of extracting dynamic bass can be configured at low cost. That is, driving
force T for vibrating a permanent magnet t = · ■ t: Wire winding turns: In current, the number t
of turns of a wire can be made a large value, so obtaining a large driving force T Since the value
of the current 1 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 other
electrodynamic electroacoustic exchangers such as a microphone having a common structural
principle.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an exploded perspective view of the main part of a dynamic cone speaker showing one
embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the same, and FIG.
3 is a longitudinal sectional view of a conventional dynamic cone speaker. is there.
[Description of the sign. Dynamic cone speaker. Center pole (central magnetic pole). -Center pole,
4 ... permanent magnet. Upper yoke plate, 6 field part frame. -Gasket (arrow), 9 ... diaphragm. Voice coil, coil bobbin, 12 ... tamper-Magnetic gap. ・ダストキャ・ツブ・ダイナミック・コーン
・スピーカ。 Cup-shaped recess, 17: Stator 7a: Peripheral wall, 17b: Bottom frame, one: Stator.
T-shaped salient pole, 20a ... pole piece. · Center ball, 21.22 · · · · · · · · · · · · · · · · · · oscillating body.
・ Permanent magnet, 26 ... magnetic circuit. ・ Magnetic gap ・ Coil for vibration force
generation. · Lead wire, 30 · · Through hole. 5 · 7 · 8 · 11 · 13 · 14 · l · 5 · 16 · Yoke, 118 · · · 20 · · ·
20b · hole, 2325 · 28 · 29 · Figure 1
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