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JP2012249029

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2012249029
PROBLEM TO BE SOLVED: To provide an electrodynamic speaker using a flat coil having a
winding axis direction orthogonal to a vibration direction of a speaker diaphragm, and a narrow
electrodynamic speaker having a short diameter direction compared with a long diameter
direction. The present invention provides an electrodynamic speaker which is excellent in sound
reproduction capability and suitable for being attached to a device such as a display. SOLUTION:
An electrodynamic speaker comprises a voice coil including a bonded first coil, a second coil and
a third coil, a speaker diaphragm connected to the voice coil, and a linear magnetic arrangement
in which the voice coil is disposed. An inner peripheral space defined by an inner peripheral end
of a voice coil formed by bonding a magnetic circuit having an air gap and a first coil, a second
coil and a third coil is accommodated, and the outer peripheral end is And a damper having a
reinforcing plate portion engaged with the peripheral end and a movable portion which is
vibratably extended from the reinforcing plate portion and connected to the frame or the
magnetic circuit. [Selected figure] Figure 3
Electrodynamic speaker
[0001]
The present invention relates to an elongated voice coil and an electrodynamic speaker in which
the minor axis direction is shorter than the major axis direction. In particular, the present
invention relates to a voice coil which is excellent in sound reproduction capability and suitable
for being attached to a device such as a display, and an electrodynamic speaker using the same.
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[0002]
In audio equipment such as a display to which a speaker for reproducing sound is attached, it is
required to miniaturize a space required to attach the speaker. In particular, in the case of an
electrodynamic speaker for achieving the elongated shape, the elongated shape may be limited
depending on the configuration of the magnetic circuit. In addition, an elongated (rectangular,
oval (elliptical, track, etc.)) electrodynamic speaker adopts a speaker magnetic circuit having a
high magnetic flux density of the magnetic gap, which has a limited diaphragm area in the minor
axis direction. When trying to do so, there are disadvantages in sound reproduction capability for
various reasons such as the width of the magnetic circuit being wider than the speaker
diaphragm and the size can not be reduced. Therefore, in order to solve these problems, various
speaker magnetic circuits and electrodynamic speakers using the same have conventionally been
proposed.
[0003]
Conventionally, there is a speaker provided with a plate-like driving force transmission member
in which a voice coil is formed in order to make the electrodynamic speaker thinner. For
example, a frame, a magnetic circuit fixed to the frame, a diaphragm fixed to the frame so as to
be able to vibrate in a predetermined direction, a driving force transmission member coupled to
the diaphragm, the driving force And a damper for supporting the transmission member, wherein
the magnetic circuit is disposed between a first plane and a second plane, and the first plane is a
plane parallel to the diaphragm. The second plane is defined as a plane parallel to the diaphragm
and defined as a plane in contact with at least a portion of the magnetic circuit. The driving force
transmitting member has a region in which a voice coil is formed, and the driving force
transmitting member is generated by the action of the current flowing through the voice coil and
the magnetic flux provided by the magnetic circuit. A driving force in a fixed direction is
transmitted to the diaphragm, and one end of the damper is coupled to the driving force
transmitting member at a position between the first plane and the second plane. A speaker, the
other end of the damper being coupled to the frame at a position between the first plane and the
second plane. (Patent Document 1).
[0004]
In addition, as a speaker provided with a plate-like driving force transmission member in which a
voice coil is formed, for example, a flat diaphragm and the back surface of the flat diaphragm are
attached along the vibration direction in the surface direction, There is a flat drive speaker
characterized by comprising a drive plate on which a coil is formed and a magnet which applies a
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magnetic field to the coil of the drive plate, the drive plate being a printed wiring board on which
a coil is printed. (Patent Document 2).
[0005]
In addition, even if the flat drive power transmission member is not provided, a voice coil formed
by flat coils having opposing straight two side surfaces at the center of the rectangular or oblong
diaphragm is subjected to the vibration. A square dynamic formed by joining one linear side to a
diaphragm so as to be substantially orthogonal to a plate, and arranging a magnetic circuit so
that a magnetic flux interlinking with the voice coil is orthogonal to a coil plane. There is a
speaker (patent document 3).
Alternatively, a diaphragm supported so as to be able to vibrate in a predetermined direction, a
pair of magnets opposed to each other in a direction orthogonal to the vibration direction of the
diaphragm, and a direction parallel to the opposed directions of the pair of magnets A voice coil
wound in a direction of a winding axis, and the voice coil has a portion in which current flows in
one direction orthogonal to the winding axis direction and the vibration direction is joined to the
diaphragm, and the current is There is a speaker device in which a portion flowing in the other
direction is disposed to face the pair of magnets (Patent Document 4).
[0006]
Patent No. 3891481 (FIGS. 1 to 11) Japanese Utility Model Application Publication No. 5848194 (Figs. 1 to 3) Japanese Utility Model Application Publication No. 59-189398 (Figs. 1 to 3)
Japanese Patent Application Laid-Open No. 2007-129665 (FIGS. 9)
[0007]
However, it is a slender electrodynamic speaker having a short diameter direction shorter than
the long diameter direction, and includes a flat coil arranged such that the direction of the
winding axis of the coil is orthogonal to the vibration direction of the speaker diaphragm. In such
a case, for example, in the case of providing a plate-like driving force transmitting member as in
Patent Document 1, the weight of the speaker vibration system increases, and the magnetic flux
density in the linear magnetic gap decreases, As a result, the playback efficiency as a speaker for
playing back may be reduced, and problems such as this may easily occur.
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On the other hand, for example, in the case where the plate-like driving force transmitting
member as in Patent Document 4 described above is not provided, the driving force acting on the
portion disposed in the magnetic gap of the magnetic circuit of the flat coil is the rigidity of the
flat coil. Due to the shortage, the signal is not sufficiently transmitted to the speaker diaphragm
joined to the flat coil, the high frequency limit frequency is lowered, and a sufficient audio
reproduction band can not be secured. As a result, an electrodynamic speaker having inferior
audio reproduction capability There is a problem of becoming In addition, in a long-sized
electrodynamic speaker including a flat coil, there is a problem that it is difficult to center the
voice coil with respect to the magnetic circuit.
[0008]
The present invention has been made to solve the above-described problems of the prior art, and
its object is to provide an electrodynamic system using a flat coil having a winding axis direction
orthogonal to the vibration direction of the speaker diaphragm. Type speaker, which is an
elongated electrodynamic speaker having a short diameter direction shorter than the major axis
direction, which is excellent in sound reproduction capability and suitable for being attached to a
device such as a display .
[0009]
In the electrodynamic speaker of the present invention, each winding axis of each of the first coil,
the second coil and the third coil, which is a flat air core coil wound in a multilayer, without
shifting the flat wire with respect to the winding axis The respective coil end faces are pasted
together so as to coincide with each other, and the first coil, the second coil and the third coil
which are pasted together are connected in series or in parallel so that the audio signal current
flows in the same direction. Voice coil, a speaker diaphragm connected to the voice coil, a
magnetic circuit having a linear magnetic gap in which the voice coil is disposed, a frame
connected to the magnetic circuit, and an outer peripheral end fixed to the frame Voice coil
formed by bonding the first coil and the second coil and the third coil to the edge supporting the
outer peripheral end of the speaker diaphragm A reinforcing plate portion accommodated in an
inner circumferential space defined by the inner circumferential end portion and whose outer
circumferential end portion engages with the inner circumferential end portion, and is vibratably
extended from the reinforcing plate portion to a frame or a magnetic circuit And a movable
portion coupled to the damper.
[0010]
Further, in the electrodynamic speaker according to the present invention, the damper is
constituted by a pair of damper members arranged in a direction along the winding axis of the
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voice coil, and each damper member is an inner peripheral end of the voice coil. And a movable
plate which is accommodated in an inner peripheral space defined by the part and whose outer
peripheral end is vibratably extended from the reinforcing plate and engaged with the inner
peripheral end and connected to a frame or a magnetic circuit The thickness of the reinforcing
plate portion of the two damper members stacked one on another is smaller than the thickness
dimension of the voice coil defined by the combined thickness of the first coil, the second coil
and the third coil.
[0011]
In the electrodynamic speaker according to the present invention, the inner peripheral end of
each of the second and third coils sandwiching the first coil is larger in inner diameter than the
inner peripheral diameter of the inner peripheral end of the first coil. The inner peripheral end of
the voice coil formed by bonding the first coil and the second coil and the third coil includes an
engagement step with which the reinforcing plate of the damper is engaged.
[0012]
Preferably, in the electrodynamic speaker according to the present invention, the second coil and
the third coil reduce the winding of the inner peripheral end of a flat air core coil having the
same number of turns as the first coil by one or more turns. An inner peripheral end of the
second coil and the third coil is configured to have an inner diameter that is larger than an inner
diameter of an inner peripheral end of the first coil.
[0013]
In addition, preferably, in the electrodynamic speaker according to the present invention, the
reinforcing plate portion of the damper includes an engagement step portion which engages with
the engagement step portion of the inner peripheral end of the voice coil at the outer peripheral
end.
[0014]
Further, in the electrodynamic speaker according to the present invention, the first coil, the
second coil, and the third coil each have a track shape including one set of straight portions and
one set of arc portions, or a rectangular shape including two sets of straight portions. The outer
peripheral end of the reinforcing plate portion of the damper includes a pair of straight portions
engaged with at least a pair of straight portions of the first coil and the second coil and the third
coil. .
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[0015]
Hereinafter, the operation of the present invention will be described.
[0016]
In the electrodynamic speaker of the present invention, the voice coil includes a flat wire (square
wire, square wire, edgewise wire) having a rectangular cross section.
Of three first, second, and third coils, which are flat air-core coils wound in multiple layers
without shifting the winding axis) relative to the winding axis, so that their winding axes coincide
with each other. It is a voice coil formed by pasting together.
The first coil and the second coil and the third coil bonded with an adhesive or varnish or the like
are connected in series or in parallel so that the audio signal current flows in the same direction.
Therefore, the voice coil of the present invention is formed into a thin flat plate whose thickness
is about three times the thickness of the flat wire.
Although the first coil and the second coil and the third coil which are multi-layeredly wound
without shifting the flat wire with respect to the winding axis respectively have a problem that
they are easily warped and deformed alone, respectively, like the voice coil of the present
invention When the coil end faces are pasted together, it is possible to prevent deformation and
maintain a flat flat shape.
[0017]
The voice coil is formed into an elongated track shape or a rectangular shape as a whole, and
when a part of the voice coil is disposed in the linear magnetic gap of the magnetic circuit, the
elongated in the short diameter direction compared to the long diameter direction An
electrodynamic speaker of the form can be realized.
The electrodynamic speaker according to the present invention comprises a speaker diaphragm
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connected to a voice coil, a frame connected to a magnetic circuit, an edge whose outer
peripheral end is fixed to the frame to support the outer peripheral end of the speaker
diaphragm. The inner periphery is connected to the voice coil, and the outer periphery is
provided with a damper connected to the frame or the magnetic circuit.
The first coil and the second coil and the third coil are formed in either a track shape including a
set of straight portions and a pair of arc portions, or a rectangular shape including two sets of
straight portions, and the damper The outer peripheral end of the reinforcing plate portion may
include a pair of straight portions engaged with at least the first and second coils and a pair of
straight portions of the third coil.
[0018]
Here, the damper is accommodated in an inner peripheral space defined by an inner peripheral
end of the voice coil formed by bonding the first coil, the second coil and the third coil, and the
outer peripheral end is an inner peripheral. A reinforcement plate portion engaged with the end
portion, and a movable portion which is vibratably extended from the reinforcement plate
portion and coupled to the frame or the magnetic circuit.
Preferably, the damper is constituted by a pair of damper members arranged in a direction along
a winding axis of the voice coil, and each damper member is disposed in an inner circumferential
space defined by an inner circumferential end of the voice coil. And a reinforcing plate portion
accommodated at an outer peripheral end thereof engaged with an inner peripheral end, and a
movable portion vibratably extending from the reinforcing plate portion and coupled to a frame
or a magnetic circuit, The thickness of the reinforcing plate portion of the two damper members
is smaller than the voice coil thickness dimension defined by the thickness obtained by bonding
the first coil, the second coil and the third coil.
[0019]
That is, in the electrodynamic speaker according to the present invention, a voice is formed by
bonding the first coil and the second coil and the third coil, which are flat air-core coils, in a track
shape or a rectangular shape. Since the coil has an inner circumferential space defined by an
inner circumferential end formed by bonding the first coil, the second coil and the third coil, the
damper is accommodated in the inner circumferential space, and the outer periphery thereof The
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end portion forms a reinforcing plate portion engaged with the inner peripheral end portion, and
the voice coil is centered with respect to the magnetic gap of the magnetic circuit and is
vibratably held without contact therewith.
The thickness of the reinforcing plate portion of the damper is smaller than the thickness
dimension of the voice coil defined by the combined thickness of the first coil, the second coil
and the third coil, and does not protrude from the inner circumferential space. That is, since the
reinforcing plate portion of this damper is smaller than the thickness dimension of the voice coil
obtained by bonding the first coil, the second coil and the third coil, an inner peripheral space
defined by the inner peripheral end of the voice coil It is housed without protruding from and
reinforces the voice coil. The voice coil is formed in a track shape in which the first coil and the
second coil and the third coil include a pair of straight portions and a pair of arc portions, or in a
rectangular shape including two pairs of straight portions. Preferably, the outer peripheral end of
the reinforcing plate includes a pair of straight portions engaged with at least a pair of straight
portions of the first coil and the second coil.
[0020]
Therefore, in the electrodynamic speaker according to the present invention, the damper
connected to the voice coil can enhance the rigidity by providing the reinforcing plate portion,
and the driving force acting on the portion disposed in the magnetic gap of the magnetic circuit
of the voice coil. Sufficiently transmit the driving force to the speaker diaphragm coupled to the
voice coil. As a result, this electrodynamic speaker can increase the high frequency limit
frequency to secure a wide audio reproduction band. Further, since the reinforcing plate portion
of the damper can be realized with the minimum volume accommodated in the inner
circumferential space of the voice coil, weight reduction is possible, and from the linear magnetic
gap size suitable for the thickness dimension of the voice coil There is no need to widen, and a
high magnetic flux density can be maintained. Therefore, it is possible to enhance the sound
reproduction efficiency and to provide an electrodynamic speaker excellent in sound
reproduction capability.
[0021]
Further, in the voice coil of the present invention, the track-shaped or rectangular inner
peripheral end may include an engagement step with which the reinforcing plate is engaged.
Specifically, the inner peripheral end of each of the second coil and the third coil sandwiching the
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first coil has an inner diameter larger than the inner diameter of the inner peripheral end of the
first coil to be bonded. If it is, the engagement step part which a reinforcing board engages with
the inner peripheral end is formed in both sides. When the second and third coils are formed by
reducing the number of turns of the inner peripheral end of the flat air core coil having the same
number of turns as the first coil by one or more turns, these turns The difference in the inner
diameter dimension due to the difference in the number may be used to form an engagement
step with which the reinforcing plate engages.
[0022]
Further, the reinforcing plate portion of the damper of the electrodynamic speaker of the present
invention may include an engagement step portion engaged with the engagement step portion of
the inner peripheral end portion of the voice coil at the outer peripheral end portion thereof. .
The reinforcing plate portion of the damper having the engagement step portion at the outer
peripheral end portion is engaged with both the inner peripheral end portion of the first coil and
the inner peripheral end portion of the second coil or the third coil. The mounting accuracy can
be enhanced to further enhance the rigidity. Therefore, the voice coil of the present invention can
balance the improvement of the reproduction efficiency of the electrodynamic speaker using it
and the lengthening, and can realize the electrodynamic speaker excellent in the reproduction
sound quality.
[0023]
The present invention relates to an electrodynamic speaker using a flat coil having a winding axis
direction orthogonal to the vibration direction of the speaker diaphragm, and in particular, a
track shape formed by multilayer winding without shifting a flat wire with respect to the winding
axis direction. An electrodynamic speaker having a coil having a short diameter direction shorter
than that of the long diameter direction, the electrodynamic speaker being excellent in sound
reproduction capability and suitable for being attached to a device such as a display it can.
[0024]
It is a figure explaining the electrodynamic-type speaker 1 by preferable embodiment of this
invention.
(Example 1) Fig. 1 is a partially enlarged cross-sectional view for explaining the configuration of
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an electrodynamic speaker 1 according to a preferred embodiment of the present invention.
(Example 1) FIG. 6 is a view for explaining a voice coil 4 and a damper 5 according to a preferred
embodiment of the present invention. (Example 1) FIG. 5 is a cross-sectional view for explaining
the configuration of the voice coil 4 and the damper 5 according to a preferred embodiment of
the present invention. Example 1
[0025]
Hereinafter, although a voice coil and an electrodynamic speaker according to preferred
embodiments of the present invention will be described, the present invention is not limited to
these embodiments.
[0026]
1 and 2 illustrate an electrodynamic speaker 1 according to a preferred embodiment of the
present invention.
3 and 4 are diagrams for explaining the voice coil 4 and the damper 5 according to a preferred
embodiment of the present invention. Specifically, FIG. 1 is a perspective view of the
electrodynamic speaker 1 viewed from the front side, and FIG. 2 is a partially enlarged view of a
cross section of the electrodynamic speaker 1 in the minor axis direction. 3 (a) is a sectional
perspective view of the voice coil 4 and the damper 5 in the minor axis direction, FIG. 3 (b) is a
sectional view thereof, and FIG. 4 is a developed view of the voice coil 4 and the damper 5. It is.
In addition, as described later, a part of the structure of the electrodynamic speaker 1, an internal
structure, and the like are omitted. Also, the direction in which the straight line (long axis)
connecting the points A-O-A 'is the major axis direction, and the direction in which the straight
line (short axis) connecting the points B-O-B' is the short axis direction .
[0027]
The electrodynamic speaker 1 of this embodiment is a slender electrodynamic speaker having a
track-shaped speaker diaphragm 2 having a major axis length L1 of about 135.6 mm and a
minor axis length L2 of about 10.0 mm. Even if elongated, it is a speaker having a diaphragm
area equal to that of a circular diaphragm having a diameter of about 35 mm. The speaker
diaphragm 2 is supported at its outer peripheral end by the edge 3, and the outer peripheral end
of the edge 3 is fixed to the frame 6. In addition, a coil 4 is connected from the back side to a
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central portion of the speaker diaphragm 2, and the coil 4 is vibratably supported by a damper 5
whose outer peripheral side is fixed to the frame 6. The coil 4 of the present embodiment is a
track-shaped coil, and is a flat coil having a winding axis direction in a direction substantially
orthogonal to the vibration direction in which the speaker diaphragm 2 vibrates. Further, the
frame 6 has an elongated shape corresponding to the track-shaped speaker diaphragm 2, and the
magnetic circuit 10 fixed so as to be accommodated in the frame 6 also has an elongated shape
having a narrow width equal to or less than the minor axis length L2. Have. Therefore, the
electrodynamic speaker 1 is a speaker suitable for a device having a small width for attaching the
speaker, such as a side surface of a display unit of a device such as a display. A terminal 7 (not
shown) to which an audio signal current is supplied is attached to the back side of the frame 6,
and a part of the magnetic circuit 10 is exposed.
[0028]
The inner peripheral side of the edge 3 is bonded to the outer peripheral end of the speaker
diaphragm 2 of the electrodynamic speaker 1, and one linear portion 4b of the track-shaped coil
4 described later is a slit on the central back surface. It is inserted into the connector and glued
with adhesive. The speaker diaphragm 2 is formed by forming a foamed thermoplastic resin in
order to reduce the weight of the speaker diaphragm. In the case of the present embodiment, the
speaker diaphragm 2 having the unevenness is obtained by using the vacuum forming method in
which the extruded thermoplastic resin foam sheet (specifically, polystyrene paper) is used in
combination with the plug assist molding. It has gained. That is, since the speaker diaphragm 2 of
the elongated shape in which the major axis direction length L1 and the minor axis direction
length L2 differ significantly, the influence of the divisional vibration in the major axis direction
tends to be remarkable. In such a manner, the shape has rigidity in the major axis direction.
[0029]
In the present embodiment, the edge 3 is formed by injecting a flexible foam rubber into a mold
and performing heat foaming. A thin-walled corrugation (or a long side of the track shape
extending linearly in the long diameter direction of the speaker diaphragm 2 and a short side of
the track shape that is arc-shaped in the short diameter direction so as to freely support the
speaker diaphragm 2 A free edge is formed by the roll. In addition, at the short side of the track
shape, an edge which is arc-shaped in the minor axis direction may be formed as a thick, thick,
fixed edge that does not vibrate freely so as to fix and support the speaker diaphragm 2 . As a
result, the elongated speaker diaphragm 2 is flexibly supported by the compliance of the free
edge portion of the edge 3 in the minor axis direction, while the foamed sheet of thermoplastic
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resin forming the loudspeaker diaphragm 2 in the major axis direction Flexibility makes it
possible to vibrate in bending.
[0030]
The coil 4 is a flat coil having a winding axis direction in a direction substantially orthogonal to
the vibration direction in which the speaker diaphragm 2 vibrates, corresponding to the magnetic
circuit 10 described later, and has a length in the major axis direction of about It is a coil with a
length of 36.2 mm, a minor axis length of about 8.2 mm, and a thickness of 4 t of about 0.75
mm. Specifically, coil 4 has a thickness of 41 t, 42 t, 43 t = about 0.25 mm, by winding a flat
rectangular wire having a thickness of 0.12 mm × 0.20 mm without shifting it relative to the
winding axis. ) Includes three air core coils 41 and 42 and 43 formed in a flat plate shape having
a winding thickness dimension of about 2.3 mm and substantially equal to the flat wire thickness
dimension. The coils 4 are formed by bonding the respective coil end faces with an adhesive (or
varnish) so that the winding axes of the coils 41 and 42 and 43 coincide with each other, and the
bonded coils 41 and 42 and 43 are It is a voice coil connected in series so that voice signal
current flows in the same direction. Since the coils 41 and 42 and 43 are multi-layeredly wound
without shifting the flat wire with respect to the winding axis, there is a problem that each of
them is easily warped and deformed alone, but when the respective coil end faces are pasted
together, It is possible to prevent deformation and maintain a flat plate shape.
[0031]
In the track-shaped coil 4 to which the coils 41 and 42 and 43 are bonded, one linear portion 4a,
the other linear portion 4b, one arc portion 4c, and the other arc portion 4d are formed, An inner
circumferential space 4f, which is a track-shaped hole, is formed on the inner circumferential
side of the track-shaped inner circumferential end 4e. The central coil 41 is arranged to be
sandwiched between the coils 42 and 43. The coils 41 and 42 and 43 constituting the coil 4 may
be coils having substantially the same number of turns. Preferably, the coils 42 and 43 may be
formed by reducing the number of turns of the inner peripheral end of a flat air core coil having
the same number of turns as the coil 41 sandwiched in the center by one or more turns. . Since
the inner peripheral ends of the coils 42 and 43 are configured to have an inner diameter
dimension larger than the inner diameter of the inner peripheral end of the coil 41, the damper 5
described later is provided to the inner peripheral end 4 e of the coil 4. An engagement step
portion is formed in which the reinforcing plate portion 5a is engaged.
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[0032]
The damper 5 is composed of a pair of damper members 51 and 52 arranged in a direction along
the winding axis of the voice coil 4. The damper members 51 and 52 are dampers that have a
common configuration and are formed by impregnating a phenolic resin with a flexible fiber
woven fabric as a base material. Damper 5 may be a damper formed by injection molding of a
resin, or may be one in which two damper members 51 and 52 are integrated, or a resin plate is
pressed It may be a member to be formed. The damper 5 is connected to the coil 4 or the frame
6 by an adhesive. The damper members 51 and 52 include a reinforcing plate portion 5a
connected to the voice coil 4, a down roll movable portion 5b extending vibratably from the
reinforcing plate portion 5a, and a frame 6 extending from the movable portion 5b. And a fixed
part 5c connected to the The reinforcing plate portions 5a of the damper members 51 and 52
are adhered so as to be in close contact with each other, and an inner peripheral space defined
by the inner peripheral end 4e of the voice coil 4 formed by laminating the coils 41 and 42 and
43. The outer peripheral end 5e is accommodated in the inner peripheral end 4e.
[0033]
In the damper 5, a voice coil thickness dimension in which the thickness 5 at (= 0.75 mm or less)
of the reinforcing plate portion 5 a of the two damper members 51 and 52 overlapped is
specified by the thickness obtained by bonding the coils 41 and 42 and 43 It becomes smaller
than 4t (= 0.75 mm). In the coil 4, two parallel sides of the outer peripheral end 5e of the
reinforcing plate 5a of the damper 5 accommodated in the inner peripheral space 4f are two
parallel sides of the track-shaped inner peripheral end 4e of the coil 4. Engage in The outer
peripheral end 5 e of the reinforcing plate 5 a of the damper 5 is engaged with the inner
peripheral end 4 e of the track shape of the coil 4 and is bonded with an adhesive. That is, the
outer peripheral end 5 e of the reinforcing plate 5 a of the damper 5 engages with the inner
peripheral surface of the innermost winding of the coils 42 and 43. The reinforcing plate portion
5a of the damper 5 of the present embodiment has a rectangular shape having a length in the
major axis direction of about 28.0 mm and a length in the minor axis direction of about 3.8 mm.
Since the thickness of reinforcing plate portion 5 a of damper members 51 and 52 is smaller
than the thickness dimension 42 t or 43 t of each of coils 42 and 43, reinforcing plate portion 5
a of damper 5 is formed from inner circumferential space 4 f of coil 4. It does not stand out. The
reinforcing plate portion 5 a of the damper 5 enhances the rigidity of the coil 4, so that the
deformation in which the flat coil 4 is warped is suppressed. The reinforcing plate portion 5a of
the damper 5 may be made of nonmagnetic metal such as copper, duralumin, or aluminum alloy,
or may be formed of synthetic resin such as ABS, PI, or PET.
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[0034]
The frame 6 is a resin injection-molded into a slender basket shape corresponding to the shape
of the speaker diaphragm 2, and a substantially rectangular fixing portion for fixing the edge 3
and a fixing portion for fixing the magnetic circuit 10; It has a connection part which connects
these fixing parts, a window defined between a plurality of connection parts, and a mounting
hole which attaches a terminal (not shown). Therefore, a speaker vibration system including the
speaker diaphragm 2, the edge 3, the coil 4 and the damper 5 is vibratably supported with
respect to the frame 6 and the magnetic circuit 10. The frame 6 may be a metal frame formed by
press-forming a steel plate.
[0035]
The magnetic circuit 10 is composed of the yokes 11 and 12 and two bar-like magnets 13 having
a rectangular cross section which are connected to the yokes 11 and 12, respectively, to form a
linear magnetic air gap 14. The magnet 13 of this embodiment is a bar-like rare earth magnet,
and is magnetized so that the flat surfaces connected to the yokes 11 or 12 have different
magnetic polarities, so a magnetic field of high magnetic flux density in the linear magnetic gap
14 Generate Each member constituting the magnetic circuit 10 is fixed by an adhesive. The
magnetic circuit 10 is also fixed to the fixing portion of the frame 6 with an adhesive. The
magnetic circuit 10 is an elongated magnetic circuit having an outer dimension of about 40.0
mm in the major axis direction and about 6.2 mm in the minor axis direction, and is disposed
inside the frame 6 whose front view is substantially the whole. Since the size is accommodated,
the electrodynamic speaker 1 can be elongated. The magnetic circuit 10 is not limited to the
configuration of the present embodiment as long as it forms a linear magnetic gap 14.
[0036]
In the electrodynamic speaker 1 of the present embodiment, in the coil 4, one linear portion 4 a
of the track shape is disposed in the linear magnetic gap 14 of the magnetic circuit 10, and the
other linear portion 4 b is the speaker diaphragm 2. Connect to the central part. In this
embodiment, the two coils 41 and 42 and 43 to be bonded together constituting the coil 4 are
the bonded portions (for example, one straight portion 4 a of the coil 41 and one straight portion
4 a of the coil 42 and the coil 3 One straight portion 4a. ) Are connected in series so that the
audio signal current flows in the same direction as each other. Of course, the coils 41 and 42 and
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43 may be connected in parallel. Further, a tinsel wire (not shown) connected to the coil 4
solders and electrically connects the terminal (not shown) fixed to the frame 6 and the lead wire
of the coil 4 from the terminal, and the voice is transmitted to the coil 4 Supply current.
However, for the tinsel wire, a metal eyelet may be provided on the speaker diaphragm 2 so as to
conduct to the terminal.
[0037]
When an audio signal current is supplied to the coil 4 of the electrodynamic speaker 1, a driving
force acts on one linear portion 4 a of the coil 4 disposed in the linear magnetic gap 14 of the
magnetic circuit 10. The coil 4 includes the reinforcing plate portion 5a of the damper 5 engaged
between one linear portion 4a and the other linear portion 4b, thereby reinforcing the coils 41
and 42 and 43 to enhance rigidity. It is done. Therefore, the driving force acting on the portion
(the one linear portion 4 a of the coil 4) disposed in the magnetic gap 14 of the magnetic circuit
10 of the coil 4 is connected to the speaker diaphragm 2 coupled to the other linear portion 4 b
of the coil 4 It is transmitted well. As a result, the electrodynamic speaker 1 using the coil 4 can
secure a wide sound reproduction band by raising the high frequency limit frequency. Further,
since the reinforcing plate portion 5a of the damper 5 can be realized with the minimum volume
accommodated in the inner circumferential space 4f of the coil 4, weight reduction is possible,
and a linear shape suitable for the thickness dimension 4t of the coil 4 A high flux density can be
maintained without having to be wider than the magnetic gap size. In addition, since the damper
5 is structured to support substantially the center of the track-shaped coil 4, the coil 4 can be
well centered with respect to the magnetic gap 14 of the magnetic circuit 10.
[0038]
Specifically, the central track-shaped coil 41 constituting the coil 4 has about 18 turns, and an
inner circumferential space 4f defined between one linear portion 4a and the other linear portion
4b. The dimension 41r of the inner peripheral end portion which is the distance in the minor axis
direction of is approximately 3.32 mm. The track-shaped coils 42 and 43 have a number of turns
of about 16 and a distance in the minor axis direction of the inner circumferential space 4f
defined between one straight portion 4a and the other straight portion 4b. The dimension 42r of
the inner peripheral end is about 3.8 mm, and the inner diameter dimensions 42r to 43r of the
inner peripheral ends of the coils 42 and 43 are larger than the inner diameter dimension 41r of
the inner peripheral end of the coil 41. The coils 42 and 43 are formed by reducing the number
of turns of the inner peripheral end of the flat air core coil having the same number of turns as
the coil 41 by three turns. As a result, in the coil 4 of the present embodiment, the inner
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15
peripheral end 4 e formed by bonding the coils 41 and 42 and 43 includes an engagement step
with which the reinforcing plate 5 a of the damper 5 described later engages. Formed as.
[0039]
That is, the engagement step portion of the inner peripheral end 4e of the coil 4 is formed by the
difference in inner diameter 41r of the inner peripheral end of each of the coils 41 and 42 and
43 to be bonded and 42r and 43r. When the coils 41 and 42 and 43 are formed using coils
having the same number of turns, the winding of the inner peripheral end of the coils 42 and 43
may be rewound so as to reduce the number of turns by one or more. Therefore, as illustrated in
FIGS. 3 and 4, the reinforcing plate 5 a constituting the damper 5 of the present embodiment
engages with the inner peripheral end 4 e including the engagement step of the coil 4. That is,
the outer peripheral end 5e of the reinforcing plate portion 5a of the damper 5 is an end surface
of the winding of several turns on the innermost side of the coil 41 and an inner peripheral
surface of the innermost side of the coils 42 and 43. Engage in
[0040]
Further, since the reinforcing plate portion 5a of the damper 5 can be realized with the minimum
volume accommodated in the inner peripheral space 4f of the coil 4 by utilizing a part of the
damper 5 constituting the vibration system, weight reduction is possible. Also, there is no need to
make the magnetic gap size wider than the linear magnetic gap suitable for the thickness
dimension 4t of the coil 4, and a high magnetic flux density can be maintained. The reinforcing
plate portion 5a of the damper 5 of the present embodiment is a rectangular flat plate which is
easy to process, but a through hole or a thickness theft may be provided to achieve weight
reduction. Therefore, the sound reproduction efficiency can be enhanced, and the electrodynamic
speaker 1 excellent in sound reproduction capability can be obtained. Since the electrodynamic
speaker 1 can increase the rigidity of the coil 4, it is possible to increase the high frequency limit
frequency to secure a wide audio reproduction band. Further, the reinforcing plate portion 5 a is
provided on the damper 5 constituting the vibration system, and the damper 4 is vibratably
supported at a substantially central position of the coil 4, so that the rolling of the coil 4 can be
suppressed.
[0041]
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The electrodynamic speaker according to the present invention can be applied not only to a
speaker incorporated in video and audio equipment such as a display, but also to a game
machine such as a game machine having a cabinet incorporating a speaker for reproducing audio
and a slot machine etc. It is. In addition, the electrodynamic speaker including the magnetic
circuit for a speaker according to the present invention can realize a speaker system that
reproduces audio in a small-sized and thin cabinet having a narrow width, and is particularly
applicable to a vehicle speaker having a limited installation space. Suitable.
[0042]
Reference Signs List 1 electrodynamic speaker 2 speaker diaphragm 3 edge 4, 41, 42, 43 coil 5
damper 51, 52 damper member 6 frame 10 magnetic circuit 11, 12 yoke 13 magnet
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