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JPH01318498

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DESCRIPTION JPH01318498
[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, and a
telephone, which is characterized in that it can be formed very thin. This type of electrodynamic
electroacoustic exchanger is configured with a different magnetic circuit configuration, the coil is
fixed, the permanent magnet moves, and 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, and the sound of the bass is easily generated, and the lead wire can be easily
pulled and the long life can be expected, and the structure is simplified. To be able to massproduce inexpensively. It is an efficient electrodynamic electroacoustic exchanger. [Technical
background and problems thereof] In one example of the electrodynamic electroacoustic
exchanger, 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. It is of the children. In this case, a
speaker that reproduces a sound wave by moving the vibrator 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 "tearmic cone speaker". A small horn is moved with a real Heus coil 7 A horn (or socalled trumpet) is attached to the front of the vibrator to radiate sound waves efficiently. A
microphone, for example, a dynamic microphone has a structure similar to that of a dynamic
speaker, but when it receives a sound wave and moves the vibrator in reverse, it vibrates in a
voice coil or a magnetic field attached to it to generate an electric current It is. Since all of these
electrodynamic electroacoustic exchangers have the same structure, the speaker will be
described below. Many prior art cone 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 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
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side. Although not shown here, the field section 6 is called an external magnet type, or is an
internal magnet type using a yoke and incorporating a columnar permanent magnet and a center
pole at the center of the inside of the yoke. It may be something. A cone-shaped frame 7 is
connected to the field portion 6, and a peripheral edge of the cone-shaped vibrating body 9 is
connected to a peripheral edge of the frame 7 by an adhesive or the like together with a gasket
(arrowhead) 8. ing.
At the central portion of the vibrating body 9, a coiled hohin made of paper, thin plastic or the
like on which a cylindrical voice coil 10 is wound at the lower part is connected. The middle part
of this coil hohin 11 holds the voice coil 10 in the middle between the magnetic poles and is
supported by tamper = 12 for applying appropriate damping (damping) to the vibration, and the
helical coil 10 of the field section 6 It is made to position correctly in 13. A dust cap 14 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, since the
magnetic circuit, that is, the magnetic field portion 6 has a radial air gap structure, there is a
drawback that the axial direction becomes extremely long and large. Also, due to such a
structure, the structure becomes complicated, and it has not been possible to mass-produce
loudspeakers suitable for reduction in size, size and size, inexpensively and easily. Further,
according to the conventional speaker 1, since the voice coil 10 or the read wire vibrates,
depending on the use for a long time, the read wire may be cut or the solder of the read wire may
be broken or broken. There was a drawback that it was awful and the life was shortened. Further,
the lead wire (not shown) of the voice coil 10 is drawn out from the upper part 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 leet wire of the Heus coil 10 into the magnetic air gap 13. It is inefficient
because the thickness of the lead wire can increase the magnetic flux density in the magnetic gap
13. ? Since both ends of the lead wire of the Heuss coil 10 must be soldered to the vibrating
body 9 etc. in order to pass both terminals of the lead wire of the Heuss coil 10 in the magnetic
gap 13, mass productivity is not excellent and expensive It had become. ? If the vibrating body
9 is formed of a thin film plastic of the present, when the terminal of the lead wire is soldered to
this, the hole is opened by heat at that time, the defect rate increases, and the vibrating body is a
desirable thin film plastic. It did not form 9 and did not mass-produce inexpensively. (2) Because
both terminals of the lead of the voice coil 10 are passed through the magnetic gap 13. When the
voice coil 10 vibrates, the lead wire may come in contact with the fixed side, and if it must be
manufactured with high accuracy, the defect rate is also very high.
Further, in the case of the conventional speaker 1, since the voice coil 10 vibrates, {circle over
(1)} The specific gravity of the wire constituting the Heuss coil 10 (specific gravity of copper is
There is a drawback that the response speed is slow due to the load being large because it is
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about 7) or heavy, and it is difficult to take out the acoustic signal more accurately over a wide
range. In particular, it was not enough to extract the dynamic bass. {Circle over (2)} to make the
weight of the voice coil 10 not heavy and to widen the magnetic gap 13 so that the disadvantage
of the above {circle over (3)} due to the wire for forming the voice coil 10 or very heavy is
eliminated. In order to prevent the magnetic flux density in the magnetic air gap 13 from being
reduced, the wires must be closely wound in a row of closely wound (or, referred to as aligned)
windings so as not to overlap. As described above, the winding production of the voice coil 10
tightly wound in one row has a drawback that it requires a great deal of precision and is very
complicated, the defect rate is high, and it is 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
Heuss coil 10 or two examples are set to 8 ? or the like according to the standard. However,
manufacturing the Heuss coil 10 according to the resistance value is very troublesome, and has a
disadvantage that the mass productivity is not excellent. Further, as described above, since the
Heuss coil 10 is not tightly wound in one row, it is possible to form a large driving force for
vibrating the Heuss coil 10 by forming a large number of turns of the lead wire. In the case of
bass, it is not possible to accurately output an audio signal. Also, especially when trying to put
out the bass precisely, it becomes very accurate. It could not be possible to form a speaker or the
like that can produce low-pitched, accurate bass. In addition, the driving force T for vibrating the
whistle coil 10 is. T = t и t: The number of turns of the conductor ? Current is conventionally
given, but conventionally it is not possible to make the number of winding turns t of the
conductor a large value for the above reason, so a large driving force as described above Or the
value of the current is increased, and the speaker 1 is 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. The axial air gap type structure using a coil and a
magnet makes it possible to form an extremely thin magnetic circuit, and it is rational to
integrate a stator yoke and a center pole. And by forming a center pole easily and fixing an air
core type flat vibration force generating coil around the center pole, a large vibration force is
exerted to generate or receive an accurate acoustic signal. It was made to be an issue.
Equally, completely changing the concept of the conventional electrodynamic electroacoustic
exchanger, the coil does not move, the permanent magnet is moved, and the lead wire is
oscillated by dragging the coil or the lead wire. The object of the present invention is to obtain a
long-lived, highly reliable electrodynamic electroacoustic exchanger which is free from breakage
due to cutting or solder detachment. In addition, the lead wire can be prevented from passing
through the magnetic gap 13, and the troublesome step of soldering the both ends of the lead
wire to the 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 lead wire does not come into sliding contact with the fixed side to be
disconnected, and as a permanent magnet, a magnet material having a specific gravity smaller
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than that of the lead (for example, The weight of the vibrator is lightened by configuring it using
a specific gravity of about 4 and moving it. In order to speed up the response speed and to take
out the acoustic signal more accurately over a wide range. In particular, it is an object of the
present invention to make it possible to construct inexpensive ones capable of taking out a quiet
bass. Also, by making the coil not moveable, it is not necessary to adopt a closely wound winding
(also referred to as alignment winding) method of closely winding in a row so as not to overlap
with extremely troublesome wires. To be able to adopt the Kara winding method that can be
manufactured inexpensively. It is an object of the present invention to make winding
manufacture extremely easy and to reduce the defect rate so that the coils can be mass-produced
inexpensively and easily. In addition, the coil is formed into a flat air-core type coil shape in
which a conductor wire which is extremely inexpensively and easily formed is wound in a large
number of turns, and sufficient to be able to accommodate the coil wound in a large number of
turns. In order to oscillate the permanent magnet by using a flat coil in which a large number of
turns of lead wire are formed so that the coil does not need to form a close winding winding in
one row while providing a magnetic circuit structure capable of forming a space. It is an object of
the present invention to make it possible to generate a large driving force so that an accurate
audio signal can be extracted even in the case of bass. In this case, driving force for vibrating the
permanent magnet TT = t и и и t: number of turns of the wire ?: in lightning current, the driving
force T is the number of turns of the wire 1. And since it is proportional to the current ?, the
number of winding turns t of the wire can be made to be a large value so that a large driving
force T can be obtained, and the value of the current ? ? ? can also be reduced. It is an object
of the present invention to make it possible to obtain an electrodynamic electroacoustic
exchanger such as a speaker with high efficiency.
SUMMARY OF THE INVENTION The object of the present invention is to provide a flat vibration
of an air-cored coil in which a large number of turns of a lead are formed on the outer periphery
of a center pole integrally formed on a stator yoke of a magnetic circuit having an air gap in the
axial direction. A coil for force generation is fixed, and a flat single pole in which the upper
surface and the lower surface are magnetized in different poles via the vibration force generation
coil and the gap in the axial direction, and the specific gravity is higher than that of the above
vibration force generation coil. A permanent magnet formed of a light magnet material is
provided so as to be capable of reciprocating vibration in the axial direction of the gap of the
magnetic circuit, and a vibrating body interlocked or abutted by reciprocating vibration in the
axial direction of the permanent magnet is directly attached to the permanent magnet or It is
achieved by spacing. [One Embodiment of the Present Invention] FIG. 1 is an exploded
perspective view of the main part of the 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. ? A torsional cone speaker 15
according to an embodiment of the present invention is, for example, a stator yoke cove having a
link-like concave portion 16 by pressing means or the like using an iron plate or the like. By
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integrally forming the frame 7 and the frame 18, the stator 19 as a field portion is formed. In the
central portion of the stator yoke 17, a center pole 20 having a hollow portion projecting upward
in the drawing by means such as a press for collecting magnetic flux from the permanent magnet
25 is attached to the stator yoke 17. It is integrally formed. Further, through holes 21 are formed
in a plurality of places in the frame 18. The flange 23 having a through hole 22 for fixing the
speaker 15 on the fixed side with a screw or the like is provided 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 link-like recess 16. The peripheral edge portion of the cone-shaped vibrating body 24 is
joined with an adhesive or the like together with the gas kerf 1 which is formed and not shown.
The flat disc-like axial thickness at the center of the lower end of the vibrating body 24 is 1 mm
or less (this may differ depending on the specification or size of the speaker 16 or about 0.5 mm
for a small speaker 16 etc. In the magnetic circuit 26, reciprocating vibration is provided in the
axial direction. The disk-shaped permanent magnet 25 can easily form a magnet that satisfies the
purpose of the invention by means of an appropriate macnet and an appropriate forming method
thereof, or the permanent magnet 25 has an upper surface and a lower surface. 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 or the N pole and the lower surface or the S pole are magnetized. Here, as a
Macnet I material that forms the optimum permanent magnet 25, the specific gravity of the
permanent magnet 25 to be formed or the flat air core type stator oscillating force generating
coil 26 described later (general specific gravity is about 7) 2 light flux density is obtained,
moreover, it is desirable that the material is easy to process or form. For this reason, 1
permanent magnet 25 selected by the inventor or the like and manufactured on trial is capable of
obtaining strong magnetic force as well as 2 macnets. Moreover, using a neodymium / iron-based
(including those mixed with components other than these three) resin magnets with a specific
gravity of around 4 to 6 so that extremely thin ones can be easily obtained. The disc is formed by
molding means. It is selected to be axially oriented and magnetized. An intermediate portion of
the permanent magnet 25 holds the permanent magnet 25 in an appropriate magnetic circuit 26,
and supports the permanent magnet 25 by a tamper (not shown) for applying suitable damping
(retarding) to the reciprocating vibration of the permanent magnet 25; The permanent magnet
25 is properly positioned within the magnetic gap 27 in the axial direction of the magnetic
circuit (field portion) 26. In addition, 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 or the magnetic air gap 27 does
not intrude. In the ring-shaped recess 16 on the outer periphery of the center pole 20 of the
stator yoke 17, a conductor for generating a flat air-core type stator oscillating force generating
coil 28 is appropriately formed by winding an electric wire with an appropriate number of turns
using an adhesive. After fixing, the lead wire 29 of the stator vibration force generating coil 28 is
drawn out from the through hole 30 provided on the side portion of the stator yoke 18 and led
to the outside. [Operation of the Invention] In the speaker 15 as an electrodynamic
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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, the
left side of the frame is left. According to the law, a force oscillating back and forth along the
axial direction of the magnetic gap 27 is generated, so that the permanent magnet 25 oscillates
back and forth along the axial direction within the magnetic gap 27. ????? The vibrating
body 24 fixed to the permanent magnet 25 vibrates to generate an acoustic sound having an
appropriate wavelength and size. According to the present invention, as is apparent from the
above configuration, a stator pole having an axial gap is integrally formed by a punching means
of a press to form a center pole inexpensively and easily, and an air core type frazo is formed on
the outer periphery thereof. Since a coil for generating a vibration force is provided, the magnetic
flux can be efficiently collected, and therefore will be described later.
There is an effect that it is possible to obtain an inexpensive electrodynamic electroacoustic
exchanger along with a thin, thin, thin evanescently thin in the axial direction. It's also
bothersome and expensive like a voice coil. In addition, using a large-sized electrodynamic
electroacoustic exchanger, and using a permanent magnet that moves without moving a coil, lead
wire cutting and vibration by dragging the lead wire and solder It is possible to obtain a highly
reliable and long-lived electrodynamic electroacoustic exchanger without breakage due to
detachment. In addition, the troublesome process of soldering both terminals of the lead wire to
the diaphragm etc. can be omitted, which is excellent for mass production. There is an effect that
can be manufactured inexpensively. Further, since it is not necessary to solder both terminals of
the lead wire to the vibrating body, it becomes possible to use a thin film plastic vibrating body
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 about 4 to 6) has a specific
gravity smaller than that of the conducting wire (specific gravity about 7) and can be made of a
magnetic material capable of strengthening the magnetic force, the weight of the vibrator
becomes lighter and the response speed becomes faster and wider It has been difficult in the
prior art because the acoustic signal can be extracted more accurately over the range. In
particular, there is an effect that it is possible to construct inexpensive ones that can take out a
dynamic bass. Furthermore, there is no need to adopt a close-winding method of closely winding
in a row so that the troublesome wires of the manufacture do not overlap very much because
there is sufficient space and the coil does not move. Since the winding can be adopted, the
manufacturing of the 7-winding wire becomes extremely easy, and the defect rate can be
reduced, and the coil can be mass-produced inexpensively and easily. Furthermore. Since the
magnetic circuit configuration of the axial air gap type is formed, the electrodynamic
electroacoustic exchanger can be formed to be extremely thin and there is an advantage that the
application field thereof can be expanded. Also, even if a permanent magnet in which the
magnetic circuit is formed thin 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 use this as a rotating part). Because it is possible to use a flat coil
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with many turns wound, it is possible to use a flat coil with many turns, so a large driving force is
needed to vibrate the permanent magnet using a coil with a number of turns. In the case of bass,
there is an effect that an accurate audio signal can be taken out. In other words, driving force T
for vibrating the permanent magnet T = t. The number of turns of wire winding of conducting
wire t = the lightning current, the number of turns t of the conducting wire can be made a large
value, so that a large driving force T can be obtained. In addition, since the value of the current I
can 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 other electrodynamic electroacoustic exchangers such as a
microphone having a common construction 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 code] 1: Dynamic cone speaker. 2 и и Center pole (central magnetic pole). 3 и и и
Center pole, 4 и и Permanent magnet. 5 ? ? ? upper yoke plate, 6 ? ? ? field part. ?????
??? 8 и и Gasket (arrow), 9 и и Diaphragm. ?????????? 11 и и Coil bobbin, 12 ...
tamper-213 и Magnetic air gap. ????????????? ????????????????
????? 16 и и Ring-shaped recess, 17 и и Stator yoke, 18 и и и Frame, 19 и и и Stator, 20 и и и Center
pole. 21.22 и и и Through hole, 23 и и и Flange. 24 иии Vibrator, 25 иии Permanent magnet. 26 magnetic
circuits, 27 magnetic gaps. 28 ? ? ? Stator vibration generating coil. 29 ... lead wire, 30 ...
through hole.
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