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JPH01258596

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DESCRIPTION JPH01258596
[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 voice coil is fixed and the field magnet is
moved. The weight of the movable body can be reduced, and as a result, the response speed is
improved and the vibration is converted to sound or current. It is possible to increase the
efficiency, to easily generate low-pitched sound, to avoid lead wires, to expect a long life, and to
simplify the structure and inexpensively mass-produce. It is an efficient electro-acoustic
exchanger. [Technical background and problems thereof] Electrodynamic electroacoustic
exchanger 1 For example, when a voice coil is movably disposed in a magnetic field and a voice
current flows, the voice coil vibrates as the current changes. It is a thing. 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) paper etc. and radiates sound waves is called a dynamic
cone speaker, and a small vibrating body is moved by a voice coil, and a trumpet is put on the
front of it to increase efficiency. Microphones that emit sound waves well are called dynamic
horn speakers. For example, dynamic microphones have the same structure as 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 4 composed 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. Although not shown here, the field section 6 is called an external magnet type, but is an
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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 Also 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 paper
together with a gasket (arrowhead) 8 is made of an adhesive at the peripheral portion of the
frame 7. 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
intermediate 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 releasing appropriate damping (vibration) to
vibration, and the voice coil 10 is magnetically gap 13 of the field section 6. I am trying to
position correctly inside. 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, it is necessary to form a
cone-shaped frame 7 and a vibrating body 9 which diverge forward toward the front on the
sound generation side of the plate yoke 3 forming the magnetic circuit (field unit 6). In addition
to the disadvantage that the gap length between the frame 7 and the vibrator 9 is long in the
axial direction at least, the field section 6 itself must be formed long in the axial direction, so it is
very thick. There is a drawback that the weight is also heavy and large. In addition, according to
the speaker l having such a configuration, the field section 6 is complicated, and a very large
permanent magnet 4 is required, so that one weight is heavy, and the large permanent magnet 4
is exposed. Leakage flux has been generated, and it has not been sufficient for use in a device
that dislikes the occurrence of the external leakage flux. Also, in the case of such a conventional
speaker l, it is general to cover the whole with the final frame (not shown), but in order to form it
inexpensively, it may be used built-in instead of using the final frame which is required by some
devices. . Alternatively, a finished product using such a final frame may be manufactured at
another place or the like, and may be delivered as the speaker 1 without the final frame. In such
a case, the vibrator 9 may be broken during transportation or during use due to a force applied
from the outside due to some external factor. Moreover, in the case of the conventional speaker
1, since the voice coil 10 drags a lead wire and vibrates, the lead wire may be cut depending on
long-term use. There has been a drawback that the lead wire may be detached from the solder,
possibly resulting in breakage, and the life may be shortened. Also, the lead wire 15 of the voice
coil 10 has its both terminals pulled out from the top through the magnetic gap 13 and is led to
the vibrating body 9 (or may be the frame 7) and soldered at that position. {Circle around (2)} By
using the voice coil 10 with a limited thickness in order to pass both terminals of the lead wire
15 of the voice coil 1o into the magnetic gap 13.
The magnetic flux density in the magnetic sky 11113 can not be increased by the thickness of
the lead wire 15, and the efficiency is low. The same is true for a speaker having a structure
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using a piezoelectric element and the like in that dynamic low temperature can not be obtained.
(2) Since both terminals of the lead wire 15 of the voice coil 10 must be inserted into the
magnetic gap 13 and both terminals of the lead wire 15 must be soldered to the vibrator 9 or the
like. The mass productivity was not good and it was expensive. ? If the vibrating body 9 is
formed of a thin film plastic of the present day, 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 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 so as not to overlap, so as to be wound in one row or so, so one row Since the winding
of the tightly wound voice coil 10 is very expensive and requires a high degree of accuracy, the
defect rate is high, and it has the disadvantage of becoming 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 ? 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 driving force T for vibrating the voice coil 10 is. T = t и и t: number of turns of wire
? = ring current given and driving force T is proportional to the number of turns of wire and
current ?, conventionally, for the above reasons, the number of turns of wire winding t has a
large value Not only can not obtain a large driving force, but also the value of the current I
becomes large, and there is a drawback that the speaker 1 becomes inefficient. [Problem of the
Invention] The problem of the present invention is to completely change the concept of the
conventional electrodynamic electroacoustic exchanger, and to receive the acoustic signal
generation side (in this case, the acoustic signal is received from the outside) In this case, the
vibrating body may be disposed on the inner side of the vibrating body so as to protect the
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vibrating body from the outside, and the voice coil is not moved but the field magnet is moved.
Therefore, it is an object of the present invention to obtain a long-lived, highly reliable
electrodynamic electroacoustic exchanger by eliminating breakage due to lead wire breakage due
to lead coil vibration due to the voice coil dragging and being detached. It is. Also, the lead wire
can be prevented from passing through the magnetic gap, and the troublesome process of
soldering both lead wires to the vibrator etc. can be omitted, and the mass productivity can be
made excellent and the cost can be reduced. Was made to the task. Further, in the subject of the
present invention, by making the voice coil not move, the lead wire is not in sliding 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) The light weight of the vibrator can be reduced by
configuring it and moving it, and the response speed can be increased. An object of the present
invention is to make it possible to extract an audio signal more accurately over a wide range, and
in particular, to be able to configure inexpensively one that can extract dynamic bass. Also, by
adopting a configuration in which the voice coil does not move, the closely wound winding (also
referred to as alignment winding) method in which the very troublesome wires are closely wound
in one row so as not to overlap is employed. It is an object of the present invention to make it
possible to adopt a finish winding, which makes the production of a single winding extremely
easy, reduces the defect rate, and allows the voice coil to be mass-produced inexpensively and
easily. Moreover, while making it the magnetic circuit structure which can comprise sufficient
space which can accommodate the voice coil which carried out many turns winding, as for voice
coil, it was not necessary to form close winding winding in 1 row, and formed many turns of
conducting wire. By using a voice coil, it is possible to generate a large driving force for vibrating
the field magnet, so that an accurate audio signal can be collected even in the case of bass. It was
an issue.
In this case, driving force T for vibrating the field magnet is given by T = t и t: number of turns of
wire I: current, and driving force T is proportional to number of turns of wire and current I
Therefore, by forming the number t of winding turns of the wire to be a large value, it is possible
to obtain a large driving force T and also to reduce the value of the current. The object is to
obtain an electrodynamic electroacoustic exchanger such as a good speaker. Means for Achieving
the Object of the Present Invention According to the object of the present invention, a frame
forming a magnetic circuit is provided on the outer side for generating and / or absorbing sound,
and an annular magnetic gap in the radial direction is formed in the center of the frame. Forming
a stator yoke, and fixedly providing a stator voice coil formed in a cylindrical shape in the
annular magnetic gap in the radial direction, and the inner and outer surfaces are attached to
different poles via the annular magnetic gap in the radial direction with the stator voice coil. An
annular magnetic gap in the radial direction is movably provided in the axial direction of the
annular magnetic gap in the radial direction, and a vibrating body interlocked or abutted by the
oscillation movement in the axial direction of the field magnet is directly attached. Alternatively,
it is achieved by providing the stator yoke on the inner side opposite to the outer side for sound
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generation and / or absorption of the stator yoke. [First Embodiment of the Present Invention]
FIG. 1 is an exploded perspective view of the main part of a dynamic cone speaker 16 according
to the present invention, and FIG. 2 is a cross-sectional view of the same. 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 present invention is formed to extend
downward in the drawing (inward direction of the speaker 16) at a central portion by a magnetic
body 1, for example, an iron plate and pressing means. The stator 19 is formed of a frame 18
formed of a magnetic body integrally formed with a cup-shaped stator yoke 17 in which a recess
17a is formed in the portion. The upper surface portion of the frame 18 is curved as it faces the
central portion. Further, the frame 18 has four through holes 20 formed on the upper surface in
order to emit the generated sound to the outside. That is, the frame 18 has its outer peripheral
portion 18a and the stator yoke 17 connected via the stay 18b. Further, the frame 18 is formed
with the four corners extended downward to integrally form the fixing leg 21, and the end is bent
at a right angle in the radial outer direction to form a through hole 22 for passing a fixing screw.
The fixing flange 23 is formed.
An upper peripheral edge of a cone-shaped vibrating body 24 formed of paper, plastic or the like
is joined to an upper peripheral edge of the frame 18 by an adhesive or the like together with a
gasket (not shown). The lower end central portion of the vibrating body 24 has a cylindrical
shape having a thickness of 1 mm or less (this may vary depending on the specifications and size
of the speaker 16 but may be about 0.5 mm for small speakers 16 etc.) A lower end portion of
the formed single pole field magnet 25 is joined, and in the annular magnetic gap 26 in the radial
direction, a 0 cylindrical field magnet 25 disposed so as to be capable of reciprocating oscillation
in the axial direction. It is possible to easily form one that can satisfy the purpose of the present
invention by an appropriate magnet and an appropriate formation method thereof. Here, as a
magnet material for forming the optimum field magnet 25, the field magnet 25 to be formed has
a magnetic flux density lighter than the specific gravity of the stator voice coil 27 described later.
Moreover, it is desirable that the material be extremely easy to process or form. As the field
magnet 25 for this purpose, a neodymium-boron-iron resin magnet having a specific gravity of
about 4 is used so that a strong magnetic force can be obtained as a magnet and a very thin
magnet can be easily obtained. These are formed in a cylindrical shape by molding means. The
field magnets 25 are magnetized to single poles so that they have different poles on the inner
and outer circumferences, and in this embodiment, the inner circumference is magnetized to the
S pole and the outer circumference to the N pole. It is a unipolar one. The field magnet 25 is held
at a predetermined position of the magnetic gap 26 at a predetermined position of the magnetic
gap 26 and supported by a damper (not shown) for applying appropriate damping (damping) to
vibration, and the field magnet 25 is It is properly positioned within the magnetic gap 26 of the
part. It is more convenient to attach a dust cap such as a dustproof cloth to the upper portion of
the stator yoke 17 so that dust in the air does not intrude into the magnetic gap 26 in the field
portion. A stator voice formed in a cylindrical shape by winding a suitable number of turns
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around the outer peripheral surface 17b of the stator yaw 717 facing the inner peripheral
surface of the field magnet 25 via the annular magnetic gap 26 in the radial direction. The coil
27 is fixed using an adhesive, and the lead wire 28 drawn to the upper end of the stator voice
coil 27 is led to the outside through the stay 18 b. [Second Embodiment of the Invention] FIG. 3
is an exploded perspective view of the main part of a dynamic cone speaker 16-1 according to
the present invention, and FIG. 4 is a longitudinal sectional view thereof.
A second embodiment of the present invention will be described below with reference to FIGS. 3
and 4. 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 16-1
according to the second embodiment of the present invention is added from the lower side by an
accident during transportation as the dynamic cone speaker 16 shown in the first embodiment.
Since there is a possibility that the vibration body 24 may be damaged by the external pressure,
this is done to prevent it. That is, the speaker 16-1 according to the second embodiment of the
present invention has a structure capable of protecting and protecting the lower portion of the
speaker 16 shown in the first embodiment. For this reason, at the lower part of the speaker 16,
protective cover plates 29 having through holes 28 substantially coinciding with the through
holes 22 formed at the four corners are fixed. In this case, the protective cover plate 29 may be
fixed in advance to the lower portion of the flange 23 or may be fixed using a screw (not shown)
when fixing the speaker 16 to the fixed side. The protective cover plate 29 may be temporarily
fixed using a screw (not shown) at the lower part. [Third Embodiment of the Invention FIG. 5 is
an exploded perspective view of the main part of the second embodiment of the present
invention, and FIG. 6 is a longitudinal sectional view of FIG. The description of the parts common
to the first embodiment and the parts that can be understood by referring to the first
embodiment will be omitted. The dynamic cone speaker 16-2 according to the third embodiment
of the present invention has almost the same structure as the speaker 16 according to the first
embodiment, but the stator yoke 17 'formed by the frame 18' serving as the stator 19 ". Besides
the difference in shape, the following points are different. The stator yoke 17 'coupled to the
central portion of the stay 18b' is formed in a cylindrical shape having a radius larger than that
of the stator yoke 17. A stator voice coil 27 'formed to have a diameter larger than that of the
voice coil 27 is fixed to the inner surface of the stator yoke 17 ░. Via the voice coil 27 'and the
annular magnetic gap 26' in the radial direction. A cylindrical field magnet 25 ░ whose outer
surface is S pole and inner surface is N pole single pole is axially movably disposed in the annular
magnetic gap 26 ?. A central portion of an upper end portion of the vibrating body 24 is
coupled to a lower end portion of the field magnet 25 'so that an acoustic signal can be
generated by oscillating movement of the field magnet 25'. Further, a dust cap 30 such as a
dustproof cloth is attached to the upper portion of the stator yoke 17 'so that dust in the air does
not intrude into the magnetic gap 26' in the field portion.
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[Fourth Embodiment of the Invention] FIG. 7 is an exploded perspective view of the main part of
a dynamic cone speaker 16-3 according to the present invention, and FIG. 8 is a longitudinal
sectional view thereof. A fourth embodiment of the present invention will be described below
with reference to FIGS. 7 and 8. The same reference numerals as in the third embodiment denote
the same parts, and a description thereof will be omitted. With the dynamic cone speaker 16-2
shown in the third embodiment, the dynamic cone speaker 16-3 according to the fourth
embodiment of the present invention is viewed from the lower side due to an accident during
transportation. There is a risk that the vibrator 24 may be damaged by the applied external
pressure, which is done to prevent it. That is, the speaker 16-3 of the fourth embodiment of the
present invention has a structure capable of protecting and protecting the lower portion of the
speaker 16-2 shown in the third embodiment. For this reason, protective cover plates 29 having
through holes 28 substantially matching the through holes 22 formed at the four corners are
fixed to the lower part of the speaker 16-2. [Operation of the Invention] In the present invention,
since the principle of operation is the same, when it is explained with reference to the first
embodiment, when an alternating current of a magnitude based on an acoustic signal is supplied
to the voice coil 27 in the speaker 16 Since the force oscillating back and forth along the axial
direction of the magnetic gap 26 is generated according to Fleming's left-hand rule, the field
magnet 25 oscillates back and forth along the axial direction in the magnetic gap 26. For this
reason, the vibrating body 24 fixed to the field magnet 26 vibrates, and an acoustic signal sound
of an appropriate wavelength and size can be generated. Since the present invention has the
above configuration, the stator yoke constituting the magnetic circuit is formed on the acoustic
signal generation side (in this case, the acoustic signal may be received from the outside), and
inside thereof Since the vibrating body is disposed to protect the vibrating body from the outside,
there is an effect that breakage of the vibrating body can be prevented by another external
pressure from the outside direction. Also, since the field magnet is moved without moving the
voice coil, breakage due to lead wire breakage or solder detachment due to vibration by dragging
the lead wire is eliminated, and the electrokinetic is highly reliable and has a long life. Type
electroacoustic exchanger can be obtained. In addition, since the troublesome step of soldering
both lead terminals to the vibrator or the like can be omitted, there is an effect of being excellent
in mass productivity and being inexpensive to manufacture. Further, since it is not necessary to
solder the terminal of the lead wire to the vibrator, it is possible to mass-produce the vibrator
inexpensively and easily using a desired thin film plastic.
In addition, since the field magnet can be made of a magnet material that has a specific gravity
smaller than that of a conducting wire and can increase the magnetic force, the weight of the
vibrator can be reduced, the response speed can be increased, and voice signals can be extracted
more accurately over a wide range. In the past, it was difficult because In particular, there is an
effect that it is possible to construct inexpensive ones with high efficiency that can take out
dynamic bass. 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
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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 massproduced 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, driving force for
vibrating the field magnet TT = t?It: number of turns of the wire I: since the number of turns t of
the wire can be made a large value in the current, a large driving force T can be obtained. Since
the value of the current I can also be reduced, there is an effect that an electrodynamic
electroacoustic exchanger such as an efficient speaker can be obtained. 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]
1 is an exploded perspective view of the main part of the dynamic cone speaker according to the
first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the same, and
FIG. 3 is a dynamic cone according to the second embodiment of the present invention. Fig. 4 is
an exploded perspective view of the main part of the speaker, Fig. 4 is a cross-sectional view of
the same edge, Fig. 5 is an exploded perspective view of the main part of a dynamic cone speaker
according to a third embodiment of the present invention, and Fig. 6 is a cross-sectional view of
the same root. 7 is an exploded perspective view of the main part of the dynamic cone speaker
according to the fourth embodiment of the present invention, FIG. 8 is a longitudinal sectional
view thereof, and FIG. 9 is a longitudinal sectional view of a conventional dynamic cone
loudspeaker It is.
[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.
???????????????????????????????????? ???????
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?????????? 17a: recessed part, 17b: outer periphery. ?????░????????
18a ... outer peripheral part. ??????????????? 19. 19 '... Stator. 20: through hole,
21: fixing leg. 22 ... through hole, 23 ... flange for fixing. 24 иии Vibrator, 25 иии Field magnet. 26.26
░ и и и An annular magnetic air gap in the radial direction. ?????????????????
??? 28 ... through hole, 29 ... protective cover plate. ?????????? ????????
?????
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