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JPH0217800

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0217800
[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. Lowfrequency fvI can be easily generated, and long or life can be expected without having to pull the
lead wire. It was made easy to mass-produce inexpensively. It is an efficient electro-acoustic
exchanger. [Technical background and problems thereof] Electrodynamic electroacoustic
exchanger 2 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 the sound wave by moving the vibrator with a coil is called a dynamic speaker,
and a speaker that emits a sound wave by directly connecting the coil to a cone-like paper is
called a dynamic cone squika. A small vibrator 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 ping speaker. As these electrodynamic electroacoustic
exchangers are all similar M 3 ′ M, the loudspeaker will be described in the following. 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. 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 joined with an adhesive or the like
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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, the voice coil 10 drags the lead wire and
vibrates, and depending on long-term use, the lead wire may be cut or the lead wire may be
detached due to solder breakage. They are accustomed and have the disadvantage of shortening
their life. In addition, lead wires (not shown) of the voice coil 10 are drawn out from the upper
part through the magnetic gap 3 from the two terminals, led to the vibrating body 9 (or may be
the frame 7) and soldered at that position. (1) In order to pass both terminals of the lead wire of
the voice coil 10 into the magnetic gap 13, by using the voice coil 10 whose thickness is limited,
the magnetic flux density in the magnetic gap 13 is increased by the thickness of the lead wire. It
could not be enhanced 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 pass through the
magnetic gap 13, there is a fear that the lead wire will contact the fixed side when the voice coil
10 vibrates, and it must be manufactured with great accuracy. 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. (2) In addition, the magnetic gap 13 is enlarged so
that the weight of the voice coil 10 is not increased and the magnetic gap is increased so that the
disadvantage of the above {circle over (3)} due to the very heavy wire for forming the voice coil
IO is eliminated. In order not to reduce the magnetic flux density in 13, the wires must be closely
wound in a row so as not to overlap (this is called aligned winding), thus in a row The winding
production of the tightly wound voice coil 10 has a drawback that it has a high defect rate and is
very expensive because it requires a great deal of precision and is difficult.
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(1) One of the causes of the above-mentioned defects of 1 and 2 is that the resistance value of
the voice coil 10 is determined to be, for example, 8 Ω according to the standard in the
conventional speaker 1 or the like. 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-1t: Number
of turns of wire I: Given by current, conventionally, since the number of turns of wire winding t
can not be made large for the above reason, a large driving force as described above Not only can
it be obtained, but also the value of the current I is increased, and there is a drawback that the
speaker l 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, highly reliable electrodynamic
electroacoustic exchanger by eliminating breakage due to lead wire breakage due to vibration
and solder detachment. In particular, in an electrodynamic electroacoustic exchanger configured
to achieve such a subject, the magnetic force of one powerfully compact field magnet is
configured to be compact and to wait for a high-performance bass sound signal. It is an object of
the present invention to provide a high-performance electrodynamic electroacoustic exchanger
that can be collected. Although there are some common items to achieve such problems, there
are also problems that can be obtained by the items unique to the embodiment, and these
problems will be described below. Another object is to enable efficient collection of the magnetic
flux density of the field magnet. And to achieve such a task. In order to concentrate the magnetic
flux density of the field magnet in a concentrated manner in the present invention, a pole piece
capable of alternately forming the N pole and the S pole as shown below is provided. An object of
the present invention is to effectively store the vibration force generating coil by effectively using
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. Can be formed, the magnetic flux density of the field magnet
can be efficiently collected in the plurality of magnetic pole pieces, and the current can be
switched to the vibration force generating coil provided in the coil storage and holding portion.
An N pole or S pole is formed on the pole piece to generate a large attraction / repulsion force to
generate a large oscillating force of the field magnet to generate an acoustic signal with good
oscillation response, that is, an accurate signal. It is an object of the present invention to make it
possible to mass-produce an electrodynamic electroacoustic exchanger which can be compactly
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and inexpensively. Also, the lead wire should not be passed through the magnetic gap between
the field magnet and the vibration force generating coil. れたものである。 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. By making it possible to adopt a glass winding, it makes manufacturing of a single
winding extremely easy and reduces the defect rate so that the vibration force generating coil
can be mass-produced inexpensively and easily. It is an object of the present invention to make it
possible to mass-produce a constant quality electrodynamic electroacoustic exchanger
inexpensively. 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
multi-turn 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: number of turns of wire ■
forming a number t of turns of wire of the wire to be a large value in a flow of 2 i In order to be
able to get a big driving force T, also electric! By making it possible to reduce the value of I, it is
an object of the present invention to obtain an electrodynamic electroacoustic exchanger such as
a speaker with high efficiency. The object of the present invention is to provide a cylindrical
single-pole field magnet in which the inner and outer surfaces are magnetized to different poles
so as to be movable in the axial direction in the wedge-shaped magnetic air gap of the magnetic
circuit. A ring-shaped coil storage concave portion for generating a vibration force in which
magnetic pole pieces which are separated from each other at upper and lower ends in the axial
direction are formed on the fixed side opposed to the side surface of the magnet via a radial gap
A vibrating body which is provided with a magnetic body, and in which an oscillating force
generating coil formed in a ring shape is accommodated and fixed in an oscillating force
generating coil accommodating recess of the magnetic body, 1 interlocked or abutted by axial
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vibration movement of the field magnet. The present invention is achieved by providing an
electrodynamic electroacoustic exchanger in which the above-mentioned field magnet is provided
directly or at intervals. [First Embodiment of the Invention FIG. 1 is an exploded perspective view
in which a part of the dynamic cone spee force 15 of the invention is cut away and omitted, and
FIG. 2 is a longitudinal sectional view thereof] is there. The first embodiment of the present
invention will be described below with reference to FIGS. 1 and 2. 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 is constructed by
superposing two ring-shaped magnetic members 17 and 18 formed of one magnetic body in the
vertical direction to form a stator 20 made of a magnetic body having a U-shaped longitudinal
section 19. The stator 20 has a magnetic field in the radial direction and the outer peripheral
surface of a cylindrical single-pole field magnet 22 in which the inner and outer surfaces are
magnetized in different poles so as to be movable in the axial direction within the yA-shaped
magnetic gap 21. The upper and lower ends in the axial direction are separated from each other
so that different poles can be formed on the side of the stator 20 facing each other through the
air gap 21 (here, 1 is separated through the magnetic air gap 21 The term "separating" is used in
this sense in the sense that it means that it faces the field magnet 22 and in the following similar
embodiments. The pole pieces 17a, 18a are formed. The magnetic pole pieces 17a and 18a are
formed on the stator 20 main body, so that they are formed on the side of the stator 20 facing
the outer peripheral surface of the field magnet 22 via the magnetic gap 21 in the radial
direction. The vibration force generating coil housing 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. It is necessary to form the inner surface of the stator 20 and the
magnetic gap 21 in the radial direction by a width 22 suitable magnet material and its
appropriate formation method. ここに、! & As a magnet material for forming a suitable field
magnet 22, the formed field magnet 22 is lighter than the specific gravity of the vibration force
generating coil 24 and 2 strong magnetic flux density can be obtained, moreover, it is extremely
easy to process or form The field magnet 22 selected and manufactured by the present inventors
is a rare earth magnet or magnet that contains 4 to 6 or neodymium / boron / iron (other than
the above three components). A resin (which may be formed including) resin (of course, may be
of a sintered type) magnet is used, which is formed into a cylindrical shape by an appropriate
means such as an injection molding means. The field magnets 22 are single pole magnetized so
as to have different poles in the inner and outer circumferences, and in this embodiment, The
inner circumference is a S pole, and the outer circumference is a single pole magnetized and
formed into an N pole. A cone-shaped frame 27 is fixed to the upper portion of the stator 20. At
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the upper end peripheral portion of the frame 27, the peripheral portion of the cone-shaped
vibrating body 28 is coupled with an adhesive or the like together with a gas kent 9 which is 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 held
at the central portion of the magnetic pole and supported by a damper 29 for damping the
vibration appropriately, and the field magnet 22 is The magnetic circuit 16) is properly
positioned in the magnetic gap 21 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. [Second Embodiment of the
Invention] FIG. 3 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 loudspeaker 31 according to a second embodiment of the present invention is a
cylindrical type in the longitudinal section through the inner surface of the field magnet 22 and
the fine annular magnetic gap 32 in the radial direction in the loudspeaker 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 ball 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 ball 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 a force
is generated, a phenomenon in which the generated sound is slightly distorted may occur
depending on certain specifications, so it is necessary to optimally design the components of the
speaker 31 in consideration of the specifications, cost and the like. [Third Embodiment of the
Invention] The loudspeakers 15 and 31 of the first and second embodiments each have an outer
periphery driving type structure, but in this third embodiment, referring to FIG. The dynamic
cone speaker 36 will 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 ring-shaped magnetic member 38 is mainly formed. The ringshaped 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
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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 magnetic pole pieces 38a and 38b, the ring-shaped
magnetic body 38 has a U-shaped coil storage recess for generating a longitudinal force in the
ring-shaped magnetic body 38 via the □ inner peripheral surface of the field magnet 22 and the
radial magnetic gap 39. '42 is formed. The vibration force generating coil 24 formed in a ring
shape is housed and fixed in the vibration force generating coil housing four part 42.
An unshown lido wire of the vibration force generating coil 24 is led to an external circuit
through an unshown through hole 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 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 40a of the
cup-type stator 40 can also function as a five back yoke for closing the magnetic path of the field
magnet 22. [Fourth Embodiment of the Invention] FIG. 5 is an exploded perspective view in
which a part of a dynamic cone speaker 44 of the present invention is cut away and omitted, and
FIG. 6 is a longitudinal sectional view of the same. A fourth embodiment of the present invention
will be described below with reference to FIGS. 5 and 6. 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. In the dynamic cone speaker 44 according to the fourth embodiment of the present
invention, in the speaker 15, the magnetic circuit 45 vibrates such that the pole pieces 17a and
18a of the two ring-shaped magnetic members 17 and 18 face the field magnet 22 respectively.
It can be said that it is a structure in which the surface of the force generating coil 24 is slightly
bent and extended. Referring to FIGS. 5 and 6, magnetic circuit 45 is a magnetic body in which
two ring-shaped magnetic members 46 and 47 formed of a magnetic body are vertically stacked
to form a U-shaped portion 48 in longitudinal section. The stator 49 is constructed. The four
stators are separated from each other on the side of the stator 49 opposed to the outer
peripheral surface of the field magnet 22 axially movably supported in the annular magnetic gap
50 via the magnetic gap 50 in the radial direction and different from each other. The pole pieces
46a and 47a are formed at the upper and lower ends in the axial direction, respectively, so that
the poles can be formed. The magnetic pole pieces 46a and 47a further extend inward in the
axial direction by bending a part of the side opposite to the field magnet 22 in the axial direction,
and generate an oscillating force opposing the field magnet 22 via the magnetic gap 50. Bent
extension portions 46 b and 47 b are formed to cover a portion facing the coil 24. As described
above, the area of the pole pieces 46a and 47a of the stator 49 opposed to the outer peripheral
surface of the field magnet 22 via the magnetic gap 50 in the radial direction is increased. It
makes it possible to obtain a larger vibration force and an accurate acoustic signal. By forming
the pole pieces 38a and 38b, the longitudinal cross section of the inner surface of the stator 49
formed by the ring-shaped magnetic members 46 and 47 via the outer circumferential surface of
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the field magnet 22 and the magnetic gap 50 in the radial direction is U-shaped. A ring-shaped
coil storage four portion 51 for generating a vibration force having a ring-shaped portion 48 is
formed.
The vibration force generating coil 24 formed in a ring shape is housed and fixed in the vibration
force generating coil housing four part 51. A lead wire (not shown) of the vibration force
generating coil 24 is led to an external circuit through a through hole (not shown) formed in the
ring-shaped magnetic member 47 or the like. A cylindrical field magnet 22 is disposed so as to
be axially reciprocable in the annular magnetic gap 50 via the inner surface of the stator 49 and
the magnetic gap 50 in the radial direction. The stator 49 is fixed to the lower end of the frame
27 by a screw 52. This is because the prototype developed and developed is drawn in a drawing
by chance, and it is necessary to adopt such means in mass production. Absent. [Fifth
Embodiment of the Invention] FIG. 7 is a longitudinal sectional view of a dynamic cone speaker
53 of the present invention. Fifth Embodiment A fifth embodiment of the present invention will
be described below with reference to FIG. The same reference numerals as in the fourth
embodiment denote the same parts, and a description thereof will be omitted. A dynamic cone
speaker 53 according to the fifth embodiment of the present invention is longitudinally cut
through the inner surface of the field magnet 22 and the fine annular magnetic gap 55 in the
radial direction in the magnetic circuit 45 of the speaker 44 of the fourth embodiment. A
cylindrically shaped center pole 56 is provided in the plane so that the magnetic path in the
magnetic circuit 54 is almost completely closed, so that a greater vibrational force is obtained.
The center ball 56 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 57 fixed to the lower portion of the stator 49. [Sixth Embodiment of the Invention] The
loudspeakers 44 and 53 of the fourth and fifth embodiments each have an outer periphery drive
type structure, but in this sixth embodiment, referring to FIG. The dynamic cone speaker 58 will
be described. The same reference numerals as in the above embodiment denote the same parts
as in the above embodiment, and a description thereof will be omitted. In the dynamic
loudspeaker 58 according to the sixth embodiment of the present invention, the magnetic circuit
59 can be formed so thin in the axial direction as to be very thin and small in outer diameter, and
therefore can be made very flat, small and light. It is drawn as it is structured. The magnetic
diagram F1859 is fixed to the upper portion of the cup-shaped stator 61 made of nonmagnetic
material via the field magnet 22 and the inner circumference of the field magnet 22 and the fine
radial annular magnetic gap 60. The ring-shaped magnetic member 62 is mainly made of a
magnetic material. The ring-shaped magnetic member 62 is formed to have a U-shaped portion
63 in the longitudinal cross-section, and a field that is movably supported in the annular
magnetic gap 60 in the axial direction on the outer periphery of the U-shaped portion 63. Inner
circumferential surface of magnet 22 and radial magnetic sky Ilj!
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The magnetic pole pieces 62a and 62b are formed on opposite upper and lower ends in the axial
direction opposite to each other through 60 and can form different poles. By forming the pole
pieces 62a and 62b, a coil for generating an oscillating force in the longitudinal cross section of
the ring-shaped magnetic body 62 via the magnetic gap 60 in the radial direction and the inner
circumferential surface of the field photodiode 22. A storage recess 64 is formed. The vibration
force generating coil 24 formed in a ring shape is accommodated and fixed in the vibration force
generating coil accommodation concave portion 64. Lead wires (not shown) of the vibration
force generating coil 24 are led to an external circuit through unshown through holes formed in
the stator 61 and the like. The stator 61 is fixed to the frame 27 by one suitable means. The
stator 61 may be formed integrally with the frame 27. If the stator 61 is formed of a magnetic
material, the outer periphery of the field magnet 22 and the annular magnetic gap 65 in the
radial direction may be formed. The side surface 61 a of the cup type stator 61 can also function
as a back yoke for closing the magnetic path of the field magnet 22. In 15.31, 36, 44. 53 and 58,
when an alternating current of a magnitude based on an acoustic signal is supplied to the
vibration force generating coil 24, two pole pieces 17a separated from each other in the axial
direction are formed. 18a, 38a and 38b, 46a and 47a. Since the magnetic poles of the N pole and
the S pole are formed to be different from each other by 62a and 62b, the magnetic poles
generated in these pole pieces and the field magnet 22 repeat attraction and repulsion, so the
magnetic gap 21, Since the force to reciprocate the field magnet 22 along the axial direction of
42, 50 ° 60 is generated, the field magnet 22 reciprocates along the axial direction within the
magnetic gap 21.42.50.60. Do. このため。 The vibrating body 28 fixed to the field magnet 22
oscillates back and forth to generate an acoustic noise having an appropriate wavelength and
size. [Effects of the Invention] [Effects of the Invention] In the embodiment of the present
invention, the working principle is the same as the present invention is evident from the abovementioned configuration, and the vibration both are the same. Since the pole piece is formed on
the surface facing the field magnet via the cylindrical magnetic gap in the radial direction, the
magnetic flux can be efficiently collected, and furthermore, the two magnetic poles separated
from each other in the axial direction Since the pieces form different poles, they can generate a
large vibrational force, and the field magnet can be oscillated back and forth with high
responsiveness, thus obtaining an electrodynamic electroacoustic exchanger capable of
generating or receiving a highly sensitive acoustic signal. There is an effect that can be done.
In addition, the conventional method that does not use a voice coil which is troublesome and
effective, and the voice coil does not move, and the field magnet moves so that the lead by
pulling and vibrating the lead wire A highly reliable and long-lived electrodynamic
electroacoustic exchanger can be obtained without breakage due to wire 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-
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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 by using a magnetic material that can increase the
magnetic force, the weight of the vibrator is reduced and the response speed is reduced. It has
been difficult in the prior art because the audio signal can be extracted more accurately over a
wide and wide range. In particular, there is an effect that inexpensive ones can be configured
with good efficiency that can extract dynamic bass acoustic signals. Furthermore, sufficient
storage space for the vibration force generating coil can be obtained. Since it is not necessary to
move the coil, it is not necessary to adopt the close winding method of closely winding in a row
so that the troublesome wires for forming the voice coil do not overlap as in the prior art. Since
the winding can be adopted, it is extremely easy to manufacture the winding of the power
generation coil, and the defect rate can be reduced, and the vibration force generation coil can be
mass-produced inexpensively and easily. Furthermore. Even if the thickness is small, a strong
magnetic force can be generated (especially, recent technology makes this possible). A field
magnet is formed of a maddie-t material and a ring-shaped coil for generating a vibration force
such as multiple turns. Since it is possible to generate a large driving force for vibrating the field
magnet by using the vibration force generating coil formed by winding a large number of turns
of the lead wire, Even in the case of an acoustic signal, there is an effect that an accurate audio
signal can be extracted. Further, when it is desired to obtain a particularly large vibration force,
driving force TT = t · It for vibrating the field magnet now: Number of turns of the wire: Since the
number of turns t of the wire can be made a large value in current, Since a large driving force T
can be obtained and the value of the power fiI can also 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 a dynamic cone speaker according to a first
embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of FIGS. 7 and 4
respectively. FIG. 5 is a longitudinal sectional view of the dynamic cone speaker according to the
second and third embodiments, FIG. 5 is an exploded perspective view of the main part of the
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dynamic cone and spline force according to the fourth embodiment of the present invention, and
FIG. FIGS. 7 and 8 are longitudinal sectional views showing the fifth and sixth embodiments of
the present invention, and FIG. 9 is a longitudinal sectional view of a conventional dynamic cone
speaker.
[Description of the code] l · · Dynamic cone speaker. 2 ... Center ball (central magnetic pole). 3 ...
Center ball, 4 ... Permanent magnet. 5 ・ ・ ・ upper yoke plate, 6 ・ ・ ・ field part. 7 · · · Frame
8 · · · · · · · · · · · · · · · · vibration body. 10: voice coil 11: coil bobbin 12: damper 13: magnetic gap.
14・・・ダストキャップ。 15・・・ダイナミック・コーン・スピーカ。 16: magnetic
circuit, 17: ring-shaped magnetic member, 17a: pole piece, 18: ring-shaped magnetic member,
18a: pole piece, 19: U-shaped portion, 20 · · · · Stator, 21 · · · annular magnetic air gap, 22 · · · field
magnet, 23 · · · · · · · · coil housing for vibration force generation, 24 · · · coil for vibration force
generation, 25 · · · lead wire, 26 ... Perforated. 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. 36: Dynamic cone speaker 237:
magnetic circuit 38: ring-shaped magnetic member 38a, 38b: pole piece 39: annular magnetic
gap 40: stator 40a · · · · · · · · · · · U-shaped portion, 42 · · · · · · · · · · · · · · · · · · · · · · · · · · · · annular
magnetic gap, 44 dynamic cone speaker, 45 · · · magnetic circuit, 46. Ring-shaped magnetic
member 4 (a 47a: pole piece, 48: U-shaped portion, 49: stator, 50: annular magnetic gap, 51: coil
storage portion for generating vibration force . 52 · · Screws, 53 · · · Dynamic con · speaker, 54 · · ·
magnetic circuit, 55 · · · annular magnetic air gap, 56 · · · center ball. 57 · · · flat ring-shaped
magnetic body, 58 · · · dynamic cone speaker 59 · · · magnetic circuit, 60 · · · annular magnetic air
gap, 61 · · · stator, 61a · · · · · · · · · · · Ring-shaped magnetic member, 62a, 62b--pole piece, 63-Ushaped part, 64-coil storage part for generating vibration force, 65-annular magnetic gap.
03-05-2019
11
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