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JPH0226498

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DESCRIPTION JPH0226498
[0001]
The present invention relates to an electrodynamic electroacoustic exchanger (electrokinetic
electroacoustic apparatus) such as a speaker or a microphone microphone, and is characterized
by a coil for generating a vibration force. Is fixed, and the field magnet moves. The weight of the
movable body can be lightened, and as a result, the response speed is improved to increase the
efficiency of converting the vibration into sound or current. Low-pitched sound can be easily
generated, and long life can be expected without having to pull the lead wire. The structure is
simplified and can be mass-produced inexpensively. It is an efficient electro-acoustic exchanger.
[Technical background and problems thereof] Electrokinetic electroacoustic exchanger 1, for
example, a speaker in which a voice coil is movably disposed in a magnetic field and voice
current flows, the voice coil vibrates as the current changes It is. 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. In addition, a small vibrator is moved by a voice coil, and a sound wave is
emitted efficiently by setting a horn on the front side of the body to make a horn--a 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
constructed 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 is also called an internal magnet type using a two-yoke and
incorporating a columnar permanent magnet and a center ball at the center of the inside of this
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 to the peripheral edge of the frame 7 with an adhesive
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or the like along with a gasket (arrows and arrows) 8 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 fitted on the upper surface of the central
portion of the vibrating body 9 so that dust in the air does not intrude into the annular magnetic
gap 13. According to such a conventional speaker 1, the voice coil 10 vibrates by dragging the
lead wire. Depending on long-term use, the lead wire may be cut or the solder of the two lead
wires may be broken, resulting in damage 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. ? Since both terminals of the lead wire of the voice coil
10 must be inserted into the magnetic gap 13 and both terminals of this J-wire must be soldered
to the vibrating body 9 etc., mass productivity is not good and expensive. If the vibrating body 9
is formed of a thin film plastic of recent years, the terminal of the lead wire is soldered thereto. In
addition, the heat at that time causes holes to be formed, the defect rate increases, and the
vibrator 9 can not be formed of a desired thin film plastic, and mass production can not be
performed 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 is a drawback that the audio signal can not be captured
more accurately over a wide range at a later time. In particular it was not enough to take out
dynamic bass. (2) In addition, the magnetic gap 13 should be increased so that the weight of the
voice coil 10 does not become heavy so that the disadvantage of E mark 1 due to the very heavy
wire for forming the voice coil 10 is eliminated. In order to prevent the magnetic flux density in
the air gap 13 from being reduced, the wires must be wound closely in a close row so as not to
overlap, so as to be called an aligned winding), thus one row Since the winding of the tightly
wound voice coil 10 is very expensive and requires a high degree of accuracy, the defect rate is
high, and it has the disadvantage of becoming very expensive.
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{Circle over (1)} One of the causes of the defects of the above {circle over (1)} and {circle over (2)}
is that the resistance .chi. 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; number
of turns of wire I: It is given by current, but conventionally, since it is not possible to set the
number of turns of wire winding t to a large value for the above reason, a large driving force as
described above Not only can it be obtained, but the value of the current I also increases, and
there is a drawback that the speaker 1 becomes inefficient. [Section H of the Invention] The
subject of the present invention is to change the concept of the conventional electrodynamic
electroacoustic exchanger, and to move the field magnet without moving the coil so that the coil
can lead the wire. The object of the present invention is to obtain a long-lived and highly reliable
electrodynamic electroacoustic exchanger without the breakage due to the cutting of the lido
wire due to the dragging and the peeling off of the solder. In particular, in an electrodynamic
electroacoustic exchanger configured to achieve such a task, vibration is performed for the
purpose of waiting for a high-performance, low-pitched acoustic signal, while achieving the task
described later, while achieving the task described later. By making the magnetic field flux that
constitutes the element give a substantially uniform magnetic flux to the vibration force
generating coil at any position within its movable stroke, vibration of a size based on a constant
specific gravity is always obtained. It is an object of the present invention to make it possible to
obtain an acoustic signal with high performance by obtaining power. An object of the present
invention is to solve the above-described problems and to efficiently collect the magnetic flux
density of the field magnet. And to achieve such a task. In order to gather the magnetic flux
density of the field magnet in a concentrated manner, in the present invention, the 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
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possible to mass-produce an electrodynamic electroacoustic exchanger which can be compactly
and inexpensively. 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. For
example, by using NM (specific gravity 4 to 6) and moving it, it is possible to lighten one of the
vibrators, to make the response speed faster, and to make speech more accurately over a wide
range. It is an object of the present invention to make it possible to take out a signal, and in
particular to make it possible to inexpensively construct a dynamic bass and a thing that can be
taken out. 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, 7 strong magnetic flux can be obtained. The object of the present
invention can be achieved by using an appropriate magnet material of rare earth deposit 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 two-winding production, reduce the defect 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, the driving force TT for vibrating the field magnet TT = t. The
number of turns of the lead I: The number of turns of the winding t of the lead is set to a large
value in the current. It is possible 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 current ? ? ? small. It was an issue. [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 ring which is provided with a
magnet and which has a plurality of pole pieces separated from each other in the axial direction
and capable of forming different poles on the fixed side opposed to the side face of the field
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magnet via the magnetic gap in the radial direction. A magnetic body having an oscillating force
generating coil accommodating recess is provided, and an oscillating force generating coil
formed in a ring shape is accommodated and fixed in the oscillating force generating coil
accommodating recess of the magnetic body, and the axial direction of the field magnet In the
electrodynamic electroacoustic exchanger, in which a vibrating body interlocked or abutted by
vibrational movement is provided directly or at intervals on the field magnet, an axial length m of
the entire plurality of magnetic pole pieces is m = L. -X-?? = ? + ?bm> X> ?> ?a, ?b where
L: axial length of field magnet X: length of vibration stroke of field magnet ?: deflection of
magnetic flux distribution at axial end of field magnet , Length ?a for lengthening the field
magnet extra to keep the fluctuation of the magnetic distribution small: ?: To suppress the
fluctuation of the magnetic distribution small by the deflection of the magnetic flux distribution
at the upper end in the direction of the field magnet The length ? b for lengthening the upper
end of the field magnet in excess: the curvature of the magnetic flux distribution at the lower end
in the axial direction of the field magnet reduces the fluctuation of the magnetic distribution. This
is achieved by providing an electrodynamic electroacoustic exchanger set to a length for
lengthening the lower end.
[Embodiment of the Invention] [First Embodiment of the Invention] FIG. 1 is an exploded
perspective view in which a part of a dynamic cone speaker 15 according to the invention is cut
away and omitted, FIG. 2 is a longitudinal sectional view thereof, 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 ring-shaped 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 the magnetic gap 21 is
separated from each other at the upper and lower ends in the axial direction so that different
poles can be formed on the side of the stator 20 facing each other via the magnetic gap 21 in the
radial direction. 21 in terms of facing the field magnet 22 and in the following similar
embodiments, the expression "separation" is used in this sense. 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. The vibration force generation coil 24 formed in a ring shape is
accommodated and fixed in a vibration force generation coil accommodation recess 23 formed of
one U-shaped portion made of the magnetic substance. The lead wires 25 of the vibration force
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generating coil 24 are led to the external circuit through the through holes 26 formed in the
magnetic member 18 forming the U-shaped portion 19. A cylindrical field magnet 22 is
reciprocably supported in the annular magnetic gap 21 in the axial direction via the inner
surface of the stator 20 and the magnetic gap 21 in the radial direction. In order for the field
magnet 22 to be able to perform strong and quick reciprocal vibration, the field magnet 22 needs
to be formed by an optimum magnet material and its appropriate formation method. ?????
& 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 generation coil 24 and a strong magnetic
flux density is obtained, and moreover, it is extremely easy to process or form The field magnet
22 selected by the inventor of the present invention for trial production has a strong magnetic
force as a magnet material, and it is easy to obtain an extremely thin one. A rare earth or
neodymium / boron / iron (which may be formed including other than the above three
components) resin (specifically may be a sintered type) magnet having a specific gravity of about
4 to 6 It is used, and it uses what formed this cylindrically by appropriate means, such as an
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 held at the center 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. An important issue of
the present invention in the structure of the hood 15 is that the coil for generating vibrational
force has a substantially uniform magnetic flux regardless of the position of the field magnet 22
constituting the vibrator within its movable stroke. It is to obtain an acoustic signal with good
performance by making it possible to obtain an oscillating force having a magnitude based on a
constant ratio by being given to 24. 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 described above, if the axial length between the pole
pieces 17a and 18a is appropriately formed, the above-mentioned field is obtained at the upper
and lower ends of the field magnet 22 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 magnet 22 in the vertical axis direction, the field magnet 22 may be vibrated
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based on a predetermined acoustic signal. The vibration force and vibration response of the field
magnet 22 are greatly affected. As a result, it is possible to obtain an acoustic signal with good
performance by being able to vibrate at a uniform size based on a constant ratio at any position
within the axial movable stroke in the magnetic gap 21 of the field magnet 22. It is desirable to
be able to 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 lengths of 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-X-?? = ?a + ?bm> X> ?> ?a, ?b where L: axial length
of field magnet 22 X: length of vibration stroke of field magnet 22: axis of field magnet 22 Due to
the bowing of the magnetic flux distribution at the end of the direction. Length ?a for
lengthening the field magnet 22 excessively in order to keep the variation of the magnetic
distribution small: ?: to keep the variation of the magnetic distribution small by the deflection of
the magnetic flux distribution at the upper end in the direction of the field magnet 22 In order to
suppress the fluctuation of the magnetic distribution small by the deflection of the magnetic flux
distribution in the axial direction lower end of the field magnet 22, an extra By setting the length
of the lower end portion of the magnet 22 to be long, the coil 24 for generating a vibration force
can make the magnetic flux distribution received from the field magnet 22 within the magnetic
gap 21 substantially uniform. As a result, the oscillating force obtained by energizing the
oscillating force generating coil 24 has a magnitude based on a fixed ratio because the magnetic
flux distribution is substantially uniform within the movable stroke of the field magnet 22. A
speaker 15 capable of obtaining an acoustic signal with 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
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 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.
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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 power is generated,
depending on certain specifications, a phenomenon occurs that 1 generated sound is slightly
dulled, so the components of the speaker 31 can be fIL3! I need to design. 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. Although the speakers 15 and 31 of the third
embodiment and the first and second embodiments of the present invention each have an outer
periphery driving type structure, 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. In the dynamic
loudspeaker 36 according to the third embodiment of the present invention, the magnetic circuit
37 can be formed so thin in the axial direction as to be very thin and small in outer diameter, and
is therefore very flat, small and light. 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 ring-shaped magnetic member
38 is formed to have a U-shaped portion 11 in a longitudinal cross section, and a field supported
movably in the axial direction in the annular magnetic gap 39 on the outer periphery of the Ushaped 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 with the
inner circumferential surface of the magnet 22 and are capable of forming different poles. By
forming the magnetic pole pieces 38a and 38b, the ring-shaped magnetic body 38 has a Ushaped coil storage concave portion for generating vibration force in the ring-shaped magnetic
body 38 via the inner circumferential surface of the field magnet 22 and three radial magnetic
gaps 42 are 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
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
magnetic segments 38a and 38b is the same as that shown in FIG. [Fourth Embodiment of the
Invention] FIG. 6 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. 7 is a longitudinal sectional view of the
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same. A fourth embodiment of the present invention will be described below with reference to
FIGS. 6 and 7. 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 speaker 44
according to the fourth embodiment of the present invention, the magnetic circuit 45 vibrates
such that the magnetic pole pieces 17a and 18a of the two ring-shaped magnetic members 17
and 18 face the field magnet 22 in the speaker 15. It can be said that it is a structure in which
the surface of the force generating coil 24 is slightly bent and extended. See Figures 6 and 7!
Thus, the magnetic circuit 45 is constructed by stacking two ring-shaped magnetic members 46
and 47 on which the la magnetic material has been formed up and down to form a stator 49
made of a magnetic material having a U-shaped longitudinal section. ing. The stator 49 is
separated from each other on the side of the stator 49 facing the outer circumferential 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 the like. The pole pieces 46a and 47a are formed on the upper
and lower ends in the axial direction so that they can be formed. The pole pieces 46 a and 47 a
respectively further bend and extend a part of the side facing the field magnet 22 inward in the
axial direction to face the field magnet 22 via the magnetic gap 50. The bending extension parts
46 b and 47 b are formed to cover a part facing the vibration force generating coil 24. As
described above, the surface precision of the pole pieces 46a and 47a of the stator 49 facing
each other through the magnetic gap 50 in the radial direction with the outer peripheral surface
of the field magnet 22 is made large. It makes it possible to obtain a larger vibration force and an
accurate acoustic signal. By forming the pole pieces 38a and 38b, the inner surface of the four
stators formed by the ring-shaped magnetic members 46 and 47 via the outer circumferential
surface of the field magnet 22 and the magnetic gap 50 directed in the radial direction is
longitudinally cut. A ring-shaped coil storage concave portion 51 for generating a vibration force
having a surface-like portion 48 is formed. The vibration force generating coil 24 formed in a
ring shape is accommodated and fixed in the vibration force generating co-il storage recess 51. A
lead wire (not shown) of the coil 24 for vibrational earth is led to an external circuit through a
through hole (not shown) formed in the ring-like 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 surfaces of the stator 4 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. The relationship between the axial length of the field magnet
22 and the axial length between the pole pieces 46a and 47a is the same as that shown in FIG. 3,
so this relationship is shown in FIG. Detailed explanation is omitted. [Fifth Embodiment of the
Invention] FIG. 9 is a longitudinal sectional view of a dynamic cone speaker 53 of the present
invention. 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 speaker 53 according to the fifth embodiment of
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the present invention is a longitudinal cross section of the magnetic circuit 45 of the speaker 44
according to the fourth embodiment via the inner surface of the field magnet 22 and the fine
annular magnetic gap 55 in the radial direction. A cylindrical center pole 56 is provided on the
surface so as to close the magnetic path in the magnetic circuit 54 almost completely to obtain a
larger vibrational force. 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. The relationship
between the axial length of the field magnet 22 and the axial length between the pole pieces 46a
and 47a in this case is the same as that shown in FIG. 8, and thus the detailed description thereof
is omitted. [Sixth Embodiment of the Invention] The loudspeakers 44 and 53 of the fourth and
fifth embodiments each have an outer peripheral drive type structure, but in this sixth practical
example, 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 is omitted. The dynamic speaker 58 according to the sixth embodiment of the
present invention can be formed so that five magnetic circuits are very thin in the axial direction
and small in outer diameter, and therefore very flat, small and light. It is drawing something that
can be configured. The five magnetic circuits are fixed to the upper portion of a cup-shaped
stator 61 made of a nonmagnetic material via the field magnet 22 and the inner circumference of
the field magnet 22 and the fine annular magnetic gap 60 in the radial direction. And the ringshaped magnetic member 62 formed of the 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 axially movably supported in the annular magnetic
gap 60 on the outer periphery of the U-shaped portion 63. The magnetic pole pieces 62a and
62b are formed on the upper and lower ends in the axial direction opposite to the inner
circumferential surface of the magnet 22 via the magnetic gap 60 in the radial direction and can
form different poles. By forming the pole pieces 62a and 62b, the ring-shaped magnetic body 62
has a U-shaped coil storage concave portion 64 for generating vibration force in the ring-shaped
magnetic body 62 via the magnetic gap 60 in the radial direction with the inner circumferential
surface of the field magnet 22. Form. 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 appropriate means. The stator 61 may be integrally formed 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-shaped stator 61 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 46a and 47a in this case is the same as
that in FIG. Therefore, the detailed description is omitted. [Operation of the invention] In the
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embodiment of the present invention, its principle of operation is. All the same, so as to explain
collectively, when alternating current having a magnitude based on an acoustic signal is supplied
to the vibration force generating coil 24 in the speakers 15.31, 36, 44.53 and 58, they are
mutually separated in the axial direction. The two pole pieces 17a and 18a, 38a and 38b, 46a
and 47a formed. 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. ????? 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] 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, and furthermore, since the two pole pieces separated from each other in the
axial direction form different poles, a large vibrational force is generated, and the field magnet is
reciprocated with good response. Therefore, there is an effect that an electrodynamic
electroacoustic exchanger capable of generating or receiving a highly sensitive acoustic signal
can be obtained. Further, in the present invention, since the above-mentioned magnetic pole
piece can be effectively used, that is, the coil storage portion for generating vibration force can
be formed by 7 magnetic materials, 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 of the magnetic pole piece m = L-X-? ? = ? a + ? b m> X>
?> ? a ? b where L: axial length of the field magnet X: Vibration stroke length of the field
magnet ?: Length of the field magnet for making the field magnet extra long in order to
suppress the fluctuation of the magnetic distribution by the deflection of the magnetic flux
distribution at the axial end of the field magnet Length ?a: ?: Length of the upper end of the
field magnet to be made extra long in order to keep the fluctuation of the magnetic distribution
small by the deviation of the magnetic flux distribution at the upper end in the direction of the
field magnet The length of the lower end of the field magnet is set to be extra long in order to
suppress the fluctuation of the magnetic distribution small by the deflection of the magnetic flux
distribution at the lower end in the axial direction. The magnetic flux distribution received by the
field magnet in the magnet and air gap can be made substantially uniform. As a result, the
oscillating force obtained by energizing the oscillating force generating coil has a size based on a
fixed ratio since the magnetic flux distribution is substantially uniform within the movable stroke
of the field magnet, and the performance is good. There is an effect that an acoustic signal 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-
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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
sufficient storage space for the vibration generating coil can be obtained and the coil can not be
moved, the very troublesome wires for forming the voice coil are closely attached so as not to
overlap as in the prior art. Since it is possible to adopt a glass winding which does not require the
close-winding method of winding in a single row, manufacturing of the winding of the coil for
generating a vibrational force is extremely easy, the defect rate is reduced, And there is an effect
which can be mass-produced easily. Furthermore. Even if the thickness is small, a strong
magnetic force can be generated (in particular, recent technology makes it possible) to form a
field magnet with a magnet material and to use a ring-like coil for generating vibrational force
wound with many turns 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 low sound signal. Further, when it is desired to obtain particularly large vibrational
force, driving force TT for vibrating the field magnet now = t?It: number of turns of wire I: in the
@ flow, the number of turns t of the wire can be made a large value. Since a large driving force T
can be obtained and the value of the current ? can also be reduced, it is possible to obtain an
efficient electrodynamic electroacoustic exchanger such as Svika. 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]
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12
FIG. 1 is an exploded perspective view of a dynamic cone speaker according to a first
embodiment of the present invention, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a field
magnet and pole pieces FIG. 4 and FIG. 5 are longitudinal sectional views of the dynamic cone
loudspeakers of the second and third embodiments of the present invention, and FIG. The
exploded perspective view of the main part of the cone speaker, the seventh country is the same
longitudinal sectional view, FIG. 8 is an explanatory view of the relationship between the field
magnet of the embodiment and the pole piece, and FIGS. 9 and 10 are each The longitudinal
cross-sectional view which shows the 5th and 6th Example of this invention.
FIG. 11 is an explanatory view of the relationship between the field magnet and the pole piece of
the embodiment, and FIG. 12 is a longitudinal sectional view of a conventional dynamic cone
speaker. [Description of Symbols] 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. lO: voice coil, 1.1: coil bobbin, 12: damper, 13:
magnetic gap 14: dust cap. 15 dynamic cone speaker 16 magnetic circuit 17 ring-shaped
magnetic member 17a pole piece 18 ring-shaped magnetic member 18a pole piece 19: U-shaped
part, 20: stator. 21 иии Annular magnetic gap, 22 и и и Field magnet, 23 и и и Vibration force
generation coil storage portion 24 и и и Vibration force generation coil 25 и и и Lead wire, 26 и и и
through hole 27 ... frame, 28 ... oscillator. 28a ... cylindrical part. ??????????????
????????? 31: Dynamic cone speaker 32: Annular magnetic gap 33: Center ball 34:
Magnetic circuit 35: Flat ring magnetic body ???????????????????? 37 и и и
Magnetic circuit, 38 и и и Ring-shaped magnetic member, 38a, 38b и и и-3 pole pieces и и и annular
magnetic air gap 240 и и и stator. 40a ... side surface, 41 ... U-shaped part. 42: Vibration force
generating coil, 43: Annular magnetic gap. ????????????????????? 45:
Magnetic circuit 46. 47: Ring-shaped magnetic member 46a, 47a: Pole piece. 48: U-shaped part,
49: Stator. 50 и и и Annular magnetic air gap, 51 и и и coil housing for generating vibration force, 52
и и и screw 53 и и dynamic cone speaker. 54: magnetic circuit, 55: annular magnetic air gap 56:
center ball, 57: flat ring magnetic body, 58: dynamic cone speaker, 59: magnetic circuit, 60 и и
Annular magnetic air gap, 61 и и и Stator, 61a и и и и и и и 62 и и и ring-shaped magnetic member. 62a,
62b ... pole piece, 63 ... U-shaped part, 64 ... coil handle for generating vibration force. 65:
annular magnetic gap.
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