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JPH0227900

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DESCRIPTION JPH0227900
[0001]
The present invention relates to an electrodynamic electroacoustic exchanger (electrokinetic
electroacoustic apparatus) such as a speaker, a microphone, and an earphone, and is
characterized in that a coil for generating a vibration force is used. It is fixed, the field magnet
moves, and the weight of the movable body can be reduced. As a result, the response speed is
improved to increase the efficiency of converting the vibration into sound or current. Lowpitched sound can be easily generated, and a long life can be expected by eliminating the need to
drag the lead line. The structure is simplified and can be mass-produced inexpensively. 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 a speaker that emits a sound wave by directly connecting a
coil to a cone-like paper is called a dynamic cone speaker, Also, a small horn is moved by a voice
coil, and a horn (in other words, a trumpet) is attached to the front surface of the vibrator to
radiate sound waves efficiently, which is called a dynamic horn speaker. 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 pole (center 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 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 cone-shaped vibrating body 9 is
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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 made of
paper, thin plastic or the like in which a cylindrical voice coil 10 is wound around the lower
portion of the vibrating body 9 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, 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. Therefore, (1) The magnetic flux density in the magnetic
gap 13 is increased by the thickness of the lead wire by using the voice coil 10 whose thickness
is limited in order to pass both terminals of the lead wire of the voice coil 10 in the magnetic gap
13 It could not be done and was inefficient. ? In order to pass both terminals of the lead wire of
the voice coil 10 into the magnetic gap 13 and both terminals of this lead wire must be soldered
to the vibrating body 9 or the like, mass productivity is not good and expensive It had become. In
the case where the vibrating body 9 is formed of a thin film plastic of the present day, when the
terminal of the lead wire is soldered to this, the heat at that time makes the hole clear and the
defect rate increases. 9 could not be formed, and mass production could not be done
inexpensively. Also, since both ends of the lead wire of the voice coil 10 are passed through the
magnetic gap 13, there is a fear that the lead wire will come into contact with the fixed side when
the voice coil 10 vibrates. The failure rate was also very high. Further, in the case of the
conventional speaker 1, since the voice coil 10 is vibrated, the wire constituting the voice coil 10
has a large load because its specific gravity (specific gravity of copper is about 7) is heavy, and
the response speed There was a drawback that it was not possible to extract the audio signal
more accurately over a wide range of late ones. In particular it was not enough to take out
dynamic bass. In addition, the magnetic gap 13 is widened to prevent the weight of the voice coil
10 from becoming heavy so that the drawback of the above 1 due to the fact that the lead wire
for forming the voice coil 10 is very heavy is eliminated. In order not to reduce the magnetic flux
density in the air gap 13, the wires must be closely wound in one row closely (or called one row
winding) so that they do not overlap, thus 1 The winding production of the voice coil 10 tightly
wound in a row has the drawback that it is very expensive and very difficult, so the defect rate is
high and it becomes very expensive.
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{Circle over (1)} One of the causes of the disadvantages 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 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?It: The number of turns of the wire 11 = current It
is not possible to set the number of winding turns t of the wire to a large value conventionally
because of the above reason. Not only can it be obtained, but the value of the current 1 also
increases, and there is a drawback that the speaker 1 becomes inefficient. SUMMARY OF THE
INVENTION The object of the present invention is to completely change the concept of the
conventional electrodynamic electroacoustic exchanger and move the field magnet without
moving the coil so that the coil drags the lead wire. It is an object of the present invention to
obtain a long-lived and highly reliable electrodynamic electroacoustic exchanger without the
breakage due to the solder wire and the breakage due to the solder detachment. In particular, in
an electrodynamic electroacoustic exchanger configured to achieve such a subject, a vibrator is
provided for the purpose of obtaining a high-performance bass acoustic signal while being
compact while achieving the later-described subject. The uniform size is always based on a
constant ratio by making the substantially uniform magnetic flux face the magnetic flux
generated from the pole piece regardless of the position within the movable stroke of the field
magnet constituting the It is an object of the present invention to obtain an acoustic signal with
high performance by obtaining an oscillating force of An object of the present invention is to
solve the above-mentioned problems and to increase the magnetic flux density of the field
magnet. And to achieve such a task. In order to make the magnetic flux density of the field
magnet intensively noticed, in the present invention, a pole piece capable of alternately forming
the N pole and the S pole as shown below is provided. However, it is an object of the present
invention to effectively store the vibration force generating coil by effectively utilizing the pole
piece.
That is, the coil storage unit for generating vibrational force is formed of a magnetic body so that
the coil can be held, and the coil storage and storage unit is mutually separated in the axial
direction and forms different poles. The plurality of magnetic pole pieces can be formed, the
efficiency of the magnetic flux density is enhanced by the plurality of magnetic pole pieces and
the field magnet, and conduction switching is performed to the vibration force generating coil
provided in the coil storage portion Form a magnetic pole piece of N or S pole to generate a large
attraction / repulsion force, generate a large vibrational force of the field magnet, and generate
an acoustic signal with good vibration response, that is, accurate It is an object of the present
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invention to make it possible to mass-produce an electrodynamic electroacoustic exchanger
which can be reduced in size and at low cost. Also, the lead wire should not be passed through
the magnetic gap between the field magnet and the vibration force generating coil. In addition, it
is possible to eliminate the troublesome process of soldering both lead terminals to the vibrator
etc., and to achieve excellent mass productivity and to be able to manufacture the electrodynamic
electroacoustic exchanger inexpensively. It is Further, in the subject of the present invention, by
making the coil not move, the lead wire does not come in sliding contact with the fixed side, and
the magnet material whose specific gravity is smaller than that of the conductor forming the coil
as a field magnet. By using (for example, one with a specific gravity of 4 to 6) and moving it, the
weight of the vibrator is lightened, the response speed is fast, and the voice signal is more
accurate over a wide range. It is an object of the present invention to make it possible to take out,
in particular, to make it possible to construct inexpensively what can take out dynamic bass. As
described above, even if a magnetic material (for example, one having a specific gravity of 4 to 6)
having a specific gravity smaller than that of a conducting wire forming a coil as a field magnet is
used, (1) radial anisotropy which can obtain strong magnetic flux The object of the present
invention can be achieved by using an appropriate magnet material of rare earth type or
neodymium / iron / boron type. Also, by making the coil not moveable, it is not necessary to
adopt a closely wound winding method (also referred to as alignment winding) in which the wires
which are very troublesome to manufacture are closely wound in a row so as not to overlap. An
electrokinetic electroacoustic exchanger of a certain quality by making it possible to adopt a
glass winding to extremely facilitate the production of a single winding, reduce the defective rate,
and enable mass production of the vibration force generating coil inexpensively and easily. It is
an object of the present invention to make it possible to mass-produce at low cost.
Also, for the purpose of obtaining extremely large vibrational force according to certain
specifications, the structure can be configured to have enough space to accommodate a multiturn wound coil, and the coils are closely wound in one row. Even in the case of a bass, a precise
bass can be generated by making it possible to generate a large driving force for vibrating the
field magnet by using a coil in which a large number of turns of conducting wire are formed
without forming the coil. It is an object of the present invention to make it possible to extract an
audio signal of By doing this, driving force for vibrating the field magnet TT = t?It: the number
of turns of the lead ? == the number of turns of the winding of the lead is set to a large value in
the current. An object is to obtain an electrodynamic electroacoustic exchanger such as a speaker
with high efficiency by making it possible to obtain a large driving force T and to make the value
of the current I small. It was done. [Problem to be achieved by the invention of the present
invention] The subject of the present invention is a cylindrical unipolar field in which inner and
outer surfaces are magnetized in different poles so as to be movable in the axial direction in the
cylindrical magnetic gap of the magnetic circuit. A magnet is provided, and a plurality of pole
pieces that can be separated from each other in the axial direction and form different poles are
formed on the fixed side facing the side face of the field magnet via a magnetic gap in the radial
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direction. A magnetic body having a ring-shaped vibration force generation coil storage recess is
provided, and a vibration force generation coil formed in a ring shape is accommodated and fixed
in the vibration force generation coil storage recess of the magnetic body, and the shaft of the
field magnet In the electrodynamic electroacoustic exchanger, in which the vibrating member
which is interlocked or abutted by the vibrational movement in the direction is directly attached
to the field magnet or spaced apart, the axial length m of all the plurality of magnetic pole pieces
is And m ? L + X + ?? = ?a + ?bm> L> x, ?> ?a, ?b where L: axial length of field magnet X:
vibration stroke length of field magnet ?: distribution of magnetic flux at axial end of field
magnet In order to keep the fluctuation of the magnetic distribution due to the sag small. Length
?a for lengthening the pole piece in excess: ?: Length for lengthening the pole piece at the
upper end in order to suppress the fluctuation of the magnetic distribution due to the magnetic
flux distribution at the upper end in the direction of the field magnet ?b: An electrodynamic
electroacoustic exchanger set to a length for increasing the length of the pole piece at the lower
end of the field magnet in order to suppress the fluctuation of the magnetic distribution due to
the deflection of the magnetic flux distribution at the lower end in the axial direction. Is achieved
by providing
[Embodiment of the Invention] [First Embodiment of the Invention] FIG. 1 is an exploded
perspective view in which a part of the dynamic cone speaker 15 of the present invention is cut
away and omitted, FIG. 3 is an explanatory view showing conditions of the field magnet and the
pole piece. A first embodiment of the present invention will be described below with reference to
FIGS. 1 to 3. A dynamic cone speaker 15 according to a first embodiment of the present
invention illustrates an arrangement in which the magnetic circuit 16 can be formed so as to be
very thin in the axial direction, and hence can be configured to be very flat and lightweight. ing.
The magnetic circuit 16 comprises a stator 20 made of a magnetic material in which two ringshaped magnetic members 17 and 18 formed of a magnetic material are vertically stacked to
form a U-shaped vertical section 19 (see FIG. 2). Configured. The stator 20 has an outer
peripheral surface of a cylindrical single-polar field magnet 22 whose inner and outer surfaces
are magnetized to different poles so as to be movable in the axial direction in the annular
magnetic gap 21 (see FIG. 2). And so as to be able to form different poles on the side of the stator
20 opposite to each other via the magnetic gap 21 in the radial direction, and are separated from
each other at the upper and lower ends in the axial direction (where one is separated This means
that the surface facing the field magnet 22 with the magnetic gap 21 interposed therebetween,
and the same also in the following embodiment. In this sense, the expression "separation J" is
used. ) Magnetic body 17a made of high permeability magnetic body. 18a is formed. The pole
piece 17b is formed by extending and bending the end portions of the magnetic members 17a
and 18a extending toward the magnetic air gap 21 in the inner vertical direction. By forming 18
b in the stator 20 main body, the generation of the vibration force formed by the longitudinal
cross-section U-shaped portion 19 on the side of the stator 20 opposed to the outer peripheral
surface of the field magnet 22 via the magnetic gap 21 in the radial direction. The coil storage
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recess 23 is formed. A vibrating force generating coil 24 formed in a ring shape is
accommodated and fixed in a vibrating force generating coil accommodating recess 23 formed
by the U-shaped portion 19 made of the magnetic material. The lead wire 25 of the vibration
force generating coil 24 is led to the external circuit through the through hole 26 formed in the
magnetic member 18 forming the U-shaped portion 19. The cylindrical field magnet 22 is
reciprocably supported in the annular magnetic gap 21 in the axial direction thereof via the
magnetic pole pieces 17b and 18b formed in the stator 20 and the magnetic gap 21 in the radial
direction. The field magnet 22 needs to be formed by an optimum magnet material and an
appropriate formation method thereof so that the field magnet 22 can perform two strong and
rapid reciprocating oscillations.
Here, as the magne-nod material forming the optimum field magnet 22, the formed field magnet
22 is lighter than the specific gravity of the vibration force generating coil 24 and a strong
magnetic flux density is obtained, It is desirable that the material be extremely easy to process or
form. For this reason, 1 field magnet 22 selected and prototyped by the present inventor can
obtain strong magnetic force as a magne-nod material, and can easily obtain an extremely thin
one. A rare earth or neodymium / boron / iron (or may be formed including other than the above
three components) resin (of course, it may be a sintered type) magnet Is formed into a cylindrical
shape by appropriate means such as injection molding means. The field magnets 22 are
magnetized to single poles so as to be different poles in 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. A cone-shaped frame 27 is fixed to the upper
portion of the stator 20. A peripheral edge portion of a cone-shaped vibrating body 28 is joined
to the upper end peripheral portion of the frame 27 by an adhesive or the like together with a
gasket (not shown). The above-mentioned field magnet 22 is coupled to the lower end cylindrical
portion 28 a of the vibrating body 28 so that reciprocal vibration can be made in the magnetic
gap 21 in the axial direction. Between the frame 27 and the cylindrical portion 28a, the field
magnet 22 is supported by a damper 29 for holding the field magnet 22 at the center of the
magnetic pole and applying appropriate damping (damping) to one vibration, and the field
magnet 22 is It is made to position correctly in the magnetic sky 11321 of the magnetic circuit
16). Further, a dust cap 30 such as a dustproof cloth is attached to the upper surface of the
central portion of the vibrating body 28 so that dust in the air does not intrude into the magnetic
gap 21. One important issue of the present invention in the structure of the hood 15 is that the
magnetic flux that forms the vibrator is substantially uniform regardless of the position within
the movable stroke of the pole pieces 17b and 18b. By facing the magnetic flux generated from
the An object of the invention is to obtain an acoustic signal with good performance by making it
possible to obtain an oscillating force of uniform magnitude based on a constant ratio at all
times. The magnetic circuit 16 having a structure capable of achieving such an object will be
described below with reference to FIG. In the dynamic cone speaker 15 having the magnetic
circuit 16, the axial length between the pole pieces 17a and 18a (the pole piece 17b).
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If the length 18b and the length including the length between the two pole pieces 17b and 18b
are properly formed, the field magnet 22 at the upper and lower ends in the axial direction
Depending on the position of the field magnet 22 in the magnetic gap 21 due to the deflection of
the magnetic flux distribution at the end of the vertical axis direction 22, even if the field magnet
22 is tried to vibrate based on a predetermined acoustic signal, such a field The vibration force
and vibration response of the magnet 22 are greatly affected. As a result, the field magnet 22 can
be vibrated with a uniform size based on a constant ratio regardless of the position within the
axial movable stroke in the magnetic gap 21 of the field magnet 22 so that the field magnet 22
can be vibrated. It is desirable to be able to obtain a good acoustic signal. For this purpose, in the
speaker 15, as shown in FIG. 3, in the magnetic circuit 16, the axial length of the field magnet 22
and the axial length between the pole pieces 17a and 18a are defined as follows. It is formed by
In addition, since the rule of the embodiment shown here can be commonly adopted to the other
embodiments, the rule described in this embodiment can naturally be considered also in the
other embodiments as needed. Therefore, this will not be described in detail in the other
embodiments below. That is, in the loudspeaker 15 described in this embodiment, assuming that
the axial length between the pole pieces 17a and 18a is m, the axial length m between the pole
pieces 17a and 18a is set to m. m L L + X + ?? = ? + + ? bm> L> x, a> aa, ab where L: axial
length of field magnet X: vibration stroke length of field magnet ?: axial direction of field
magnet In order to suppress the fluctuation of the magnetic distribution due to the sag of the
magnetic flux distribution at the end of the. Length ?a for lengthening the pole piece in excess:
?: Length for lengthening the pole piece at the upper end in order to suppress the fluctuation of
the magnetic distribution due to the magnetic flux distribution at the upper end in the direction
of the field magnet ?b = field magnet 22 by setting the length of the pole piece at the lower end
to be long in order to suppress the fluctuation of the magnetic distribution due to the deflection
of the magnetic flux distribution at the lower end in the axial direction of the field magnet The
magnetic flux distribution received from the pole pieces 17a and 18a in the magnetic gap 21 can
be made substantially uniform. As a result, in the vibrational force obtained by energizing the
vibrational force generation coil 24, the magnetic flux distribution in the magnetic gap in the
movable stroke of the field magnet 22 is substantially uniform, and the magnetic flux density is
increased. Therefore, since it becomes uniform size based on a fixed ratio, the speaker 15 which
can obtain an acoustic signal with a good performance can be formed.
[Second Embodiment of the Invention] FIG. 4 is a longitudinal sectional view of a dynamic cone
speaker 31 of the present invention. The second embodiment of the present invention will be
described below with reference to FIG. 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. A
dynamic cone speaker 31 according to a second embodiment of the present invention is a
cylindrical type in the longitudinal cross section through the inner surface of the field magnet 22
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and the fine annular magnetic gap 32 in the radial direction in the speaker 15 of the first
embodiment. The center ball 33 is formed to substantially completely close the magnetic path in
the magnetic circuit 34 to obtain a larger vibrational force. The center pole 33 made of a
magnetic body is configured by integrally forming a cylindrical magnetic body perpendicularly to
the inner peripheral portion of the flat ring-shaped magnetic body 35 fixed to the lower portion
of the magnetic body 18. In the speaker 31 of the second embodiment, since the center pole 33
is provided on the inner peripheral portion of the field magnet 22 to completely close the
magnetic path, the vibration is large compared to the speaker 15 of the first embodiment.
Although power is generated, a phenomenon in which the generated sound is somewhat
distorted occurs depending on certain specifications, so it is necessary to appropriately design
the components of the speaker 31 appropriately in consideration of the specifications, cost and
the like. For this purpose, it is convenient to provide a good conductor metal for preventing the
generation of eddy current such as a copper ring, for the purpose of reducing the inductance, for
example, at a location facing the field magnet 22 of the center ball 33. . The relationship between
the axial length of the field magnet 22 and the axial length between the pole pieces 17a and 18a
is the same as that shown in FIG. [Third Preferred Embodiment of the Invention] The speakers 15
and 31 of the first and second embodiments each have an outer periphery drive type structure,
but in this third embodiment, referring to FIG. Dynamic cone speaker 36 will now be described.
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 36 according
to the third embodiment of the present invention can be formed so that the magnetic circuit 37 is
very thin in thickness in the axial direction and small in outer diameter, and is therefore very flat,
small in size and light in weight I'm drawing something. The magnetic circuit 37 is a magnetic
body fixed to a field magnet 22 and a cup-shaped stator 40 made of a nonmagnetic body via an
inner circumference of the field magnet 22 and a fine radial annular magnetic gap 39. The ringshaped magnetic member 38 is mainly formed.
The ring-shaped magnetic member 38 is formed to have a U-shaped portion 41 in a longitudinal
cross section, and a field that is movably supported in the annular magnetic gap 39 in the axial
direction on the outer periphery of the U-shaped portion 41. The pole pieces 38a and 38b are
formed on the upper and lower ends in the axial direction opposite to each other via the
magnetic gap 39 in the radial direction and the inner circumferential surface of the magnet 22
and can form different poles. By forming the pole pieces 38a and 38b, the ring-shaped magnetic
body 38 receives a coil for generating an oscillating force generating a longitudinal U-shaped
vibration via the inner circumferential surface of the field magnet 22 and the radial magnetic gap
39. The recess 42 is formed. The vibration force generating coil 24 formed in a ring shape is
accommodated and fixed in the vibration force generating coil accommodation recess 42. The
unshown lead wires of the vibration force generating coil 24 are led to an external circuit
through unshown through holes formed in the stator 40 and the like. The stator 40 is fixed to the
frame 27 by appropriate means. The stator 40 may be integrally formed with the frame 27. If the
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stator 40 is formed of a magnetic material, the outer periphery of the field magnet 22 and the
annular magnetic gap 43 in the radial direction may be used. The side surface 40 a of the cup
type stator 40 can also function as a back yoke for closing the magnetic path of the field magnet
22. The relationship between the axial length of the field magnet 22 and the axial length between
the pole pieces 38a and 38b is the same as that shown in FIG. [Operation of the invention] In the
embodiment of the present invention, its principle of operation is. All the same, and collectively
described, in the speakers 15.31 and 36, when alternating current having a magnitude based on
the acoustic signal is supplied to the vibration force generating coil 24, two of the coils are
separated from each other in the axial direction. The magnetic pole pieces 17a and 18a, 38a and
38b form the N pole and the SfI magnetic pole so as to be different from each other, so that the
magnetic poles generated on these pole pieces and the field magnet 22 exhibit attraction and
repulsion phenomena. Since the force is generated to reciprocate the field magnet 22 along the
axial direction of the magnetic gap 21.42, the field magnet 22 reciprocates along the axial
direction within the magnetic gap 21.42. . For this reason, the vibrator 28 fixed to the field
magnet 22 oscillates back and forth, and an acoustic signal sound of an appropriate wavelength
and size can be generated. [Effects of the Invention] As apparent from the above configuration,
the present invention is characterized in that the oscillating force generating coil forms a pole
piece on the surface facing the field magnet via the cylindrical magnetic gap in the radial
direction, The magnetic flux can be efficiently collected to increase the magnetic flux density in
the magnetic gap, and furthermore, since two pole pieces separated from each other in the axial
direction form different poles, a large vibrational force is generated and responsiveness Since the
field magnet can be oscillated back and forth well, it is possible to obtain an electrodynamic
electroacoustic exchanger capable of generating or receiving a highly sensitive acoustic signal.
Further, in the present invention, since the above magnetic pole piece can be effectively used,
that is, the coil storage portion for generating vibration force can be formed of a magnetic body,
and the coil for generating vibration force can be held. There is an effect that the coil can be
stored and protected rationally in the coil storage portion. In the present invention, the axial
length m of the magnetic pole piece is m ? L + X + ?? = ?a + ?bm> L> x, a> a a, ab where L:
axial length of field magnet ?x: Vibration stroke length ? of the field magnet: In order to
suppress the fluctuation of the magnetic distribution due to the sag of the magnetic flux
distribution at the axial end of the field magnet. Length ?a for lengthening the pole piece in
excess: Length ?b for lengthening the pole piece in the upper end in order to suppress the
fluctuation of the magnetic distribution due to the magnetic flux distribution at the upper end in
the direction of the mini field magnet Since the length of the pole piece at the lower end is set to
be long in order to suppress the fluctuation of the magnetic distribution due to the deflection of
the magnetic flux distribution at the lower end in the axial direction of the field magnet, the field
magnet is magnetic The magnetic flux distribution received from the pole piece in the air gap can
be made substantially uniform. As a result, the oscillating force obtained by energizing the
oscillating force generating coil is such that the field magnet receives substantially uniform and
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large magnetic flux distribution generated from the pole piece within the movable stroke. There
is an effect that it becomes an even size based on the above, and an acoustic signal with good
performance can be obtained. In addition, the conventional method, which is troublesome and
unnecessary, does not use a voice coil, and the coil does not move, and the field magnet moves so
that the lead wire is moved by pulling and vibrating the lead wire. It is possible to obtain a highly
reliable and long-lived electrodynamic electroacoustic exchanger without any breakage due to
cutting or solder detachment. In addition, since the troublesome step of soldering both terminals
of the lead wire of the coil for generating a vibrational force to a vibrator or the like can be
omitted, there is an effect of being excellent in mass productivity and inexpensive to
manufacture. Further, since it is not necessary to solder the terminal of the lead wire to the
vibrator, it is possible to mass-produce the vibrator inexpensively and easily using a desired thin
film plastic. In addition, the field magnet (for example, specific gravity 4 to 6) has a specific
gravity smaller than that of the conducting wire (specific gravity 7), and is made of a magnet
material that can increase the magnetic force. The weight of the vibrator is reduced, the response
speed is increased, and the voice signal can be extracted more accurately over a wide range,
which is difficult in the related art.
In particular, there is an effect that inexpensive ones can be configured with good efficiency that
can extract dynamic bass acoustic signals. Furthermore, since a large storage space for the
vibration generating coil can be obtained and the coil does not have to be moved, the
troublesome wires for producing the emergency coil for forming the voice coil do not overlap as
in the prior art. Since the coiling method does not need to adopt the close-wound winding
method of winding in one row, the winding production of the coil for generating a vibration force
is extremely facilitated, the defect rate is reduced, and the vibration force is generated. There is
an effect that the coils can be mass-produced inexpensively and easily. Furthermore. Even if the
thickness is small, a strong magnetic force can be generated (especially, recent technologies
enable this). A field magnet is formed of a magnet material and a ring-shaped coil or the like for
generating vibration force is used. Because it can be done, using the coil for generating
vibrational force in which multiple turns of lead wire are formed. As a large driving force for
vibrating the field magnet can be generated, there is an effect that an accurate audio signal can
be extracted even in the case of a bass acoustic signal. Further, when it is desired to obtain a
particularly large vibrational force, driving force TT for vibrating the field mag wood now: t-It:
number of turns of the lead ? == in the current, the number of turns t of the lead is made a large
value. Since this can be done, a large driving force T can be obtained, and the value of the current
I can also be reduced, so that there is an effect of being able 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. ?????? BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded
perspective view of a dynamic cone speaker according to a first embodiment of the present
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invention, FIG. 2 is a longitudinal sectional view, and FIG. Explanatory drawing of the relationship
between a magnet and a pole piece, FIG. 4 and FIG. 5 are the longitudinal cross-sectional views of
the dynamic cone speaker of 2nd and 3rd Example of this invention, respectively, FIG. 6 is the
conventional dynamic cone. -It is a longitudinal cross-sectional view of a speaker. [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. 10: voice coil, 11: coil bobbin, 12: damper, 13: magnetic gap.
????????????? ????????????????????? 16: magnetic
circuit, 17: ring-shaped magnetic member, 17a: magnetic body, 17b: pole piece. 18: ring-shaped
magnetic member, 18a: magnetic body, 18b: pole piece, 19: U-shaped portion. 20: Stator, 21:
Annular magnetic gap. 22 иии Field magnet, 23 и и и Coil storage unit for generating vibration force,
24 и и и Coil for generating vibration force, 25 и и и Lead wire, 26 и и и Through hole. 27: Frame, 28:
Vibrator. 28a: cylindrical portion, 29: damper 30, dust cap, 31: dynamic cone speaker, 32:
annular magnetic gap, 33: center ball, 34: magnetic circuit , 35 ... flat ring-shaped magnetic body.
????????????????????? 37: Magnetic circuit 38: Ring-shaped magnetic
member 38a, 38b---Pole piece. 39: annular magnetic gap, 40: stator. 40a ... side surface, 41 ... Ushaped part.
03-05-2019
11
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