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JP2009194583

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DESCRIPTION JP2009194583
PROBLEM TO BE SOLVED: To be easy to manufacture and generate rolling etc. even if a tinsel
wire is drawn out from a long diameter direction of a damper, which is a narrow-width
electrodynamic speaker whose short diameter direction is shorter than the long diameter
direction. To provide an electrodynamic speaker in which the quality is stable and the tinsel wire
does not contact the speaker diaphragm or the like to generate abnormal noise. SOLUTION: A
damper base having an elongated frame having a fixing part fixed to a damper base at an outer
peripheral end in a long axis direction and having an elongated frame having a long axis
direction and a short axis direction is a damper A middle diameter side frame portion to which
the fixing portion is fixed, and a short diameter side frame portion having an inner dimension
larger than the length between the short diameter side end portions on both sides of the damper
and separated The part is fixed to the tinsel wire fixing part of the frame of the damper base.
[Selected figure] Figure 3
Electrodynamic speaker and method of manufacturing the same
[0001]
The present invention 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, and a method of manufacturing the
same. About.
[0002]
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1
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, the elongated (rectangular, oval (elliptical, track, etc.)) electrodynamic speaker is
affected by the divided vibration unique to the elongated speaker diaphragm in which the
diaphragm area is limited in the minor axis direction. It is difficult to obtain a large, flat
reproduction sound pressure frequency characteristic. If it is attempted to adopt a speaker
magnetic circuit having a high magnetic flux density in the magnetic gap, the width of the
magnetic circuit becomes wider than the speaker diaphragm and can not be miniaturized. There
are disadvantages in audio playback capabilities for various reasons. Therefore, in order to solve
these problems, various speaker diaphragms, magnetic circuits for speakers, and electrodynamic
speakers using the same have conventionally been proposed.
[0003]
For example, conventionally, a magnetic circuit having a magnetic gap, a frame formed in an
oval, rectangular, or oval shape coupled to the upper surface of the magnetic circuit, and a voice
to be fitted in the magnetic gap Elliptical, rectangular, in which the coil is coupled to the center
and the peripheral edge is coupled to the outer periphery of the frame, and the inner periphery is
coupled to the middle of the voice coil and the outer periphery in the major diameter direction is
coupled to the frame There is a speaker which consists of a damper formed in either shape of a
shape and a long circle (patent documents 1). With this configuration, the speaker has a
structure that can increase the area of the damper, increase the degree of flexibility, and increase
the amplitude, thus providing a high-quality speaker with a wide reproduction band and low
distortion. The purpose is to
[0004]
Also, conventionally, a magnetic circuit having a magnetic gap, an elongated frame coupled to the
upper surface of the magnetic circuit, a voice coil fitted to the magnetic gap, and an outer
periphery coupled to the voice coil A diaphragm coupled to the frame, and a damper having an
inner periphery coupled to the voice coil and an outer periphery coupled to only the major axis
direction of the frame while one of the major axis directions is set shorter than the other There is
a speaker constituted by a tinsel wire of a voice coil drawn from a short side of the damper set in
the major axis direction (Patent Document 2). In this speaker, the drawn side of the tinsel wire of
the damper is shortened to balance the weight of the vibration system, thereby suppressing
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2
rolling in the longitudinal direction at the time of large input to the speaker and preventing
contact with the voice coil plate. Trying to prevent the generation of abnormal noise (Fig. 1, Fig.
2).
[0005]
However, the speaker described in Patent Document 2 uses a special damper in which one of the
major axis directions is shorter than the other in the distance from the other, and the voice from
the shorter side of this damper is set. The problem is solved by pulling out the tinsel wire of the
coil, and there is a problem that a normal elongated damper can not be used.
[0006]
In addition, as described in Patent Document 1, in a long-shaped electrodynamic speaker, a tinsel
wire that bridges between a voice coil and a terminal for external connection may be drawn out
from the longitudinal direction of the damper, and as a result In a speaker having a low minimum
resonance frequency, if a large input is applied and the amplitude becomes large, rolling in the
long diameter direction may occur, and the voice coil may hit the plate to generate an abnormal
sound.
Furthermore, when the tinsel wire is drawn out from the longitudinal direction of the damper, the
tinsel wire becomes long, and as a result, a jumping motion of the tinsel wire occurs, and the
tinsel wire becomes a speaker diaphragm, damper, or frame There is a possibility that abnormal
noise may be generated upon contact, resulting in malfunction. FIGS. 7 and 8 of Patent Document
3 describe a speaker for fixing an intermediate portion of a tinsel cord to a bonding margin
portion of a damper.
[0007]
Japanese Patent Application Laid-Open No. 8-51695 Japanese Patent Application Laid-Open No.
11-27794 Japanese Utility Model Application Laid-Open No. 2-896
[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 loudspeaker having a slender shape in which the minor
axis direction is shorter than the major axis direction. Even if the damper is drawn out from the
long diameter direction of the damper, it is easy to manufacture and stable in quality without
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3
rolling and the like, and the tinsel wire contacts the speaker diaphragm and the like to generate
abnormal noise The goal is to provide an electrodynamic speaker that has nothing to do with it.
[0009]
The electrodynamic speaker according to the present invention is a slender electrodynamic
speaker having a major axis direction and a minor axis direction, wherein a damper for movably
arranging a voice coil in a magnetic gap of a magnetic circuit and a voice coil are conducted. And
a damper base for fixing the damper to the magnetic circuit, wherein a long and narrow damper
having a long diameter direction and a short diameter direction is fixed to the damper base at the
outer peripheral end of the long diameter direction. A damper base having an elongated frame
body having a major axis direction and a minor axis direction, between the major axis side frame
portion to which the fixing portion of the damper is fixed and the minor axis end portions on
both sides of the damper The short diameter side frame part which has an inner dimension larger
than a length and is separated, The middle part of a tinsel wire is fixed to the frame of a damper
stand.
[0010]
Preferably, in the electrodynamic speaker according to the present invention, a jig for inserting a
shaping jig for shaping a tinsel wire between the short diameter side frame portion of the
damper base and the short diameter end portion of the elongated damper Define the insertion
gap.
[0011]
Also preferably, in the electrodynamic speaker according to the present invention, the tinsel cord
is shaped by a shaping jig between one end fixed to the voice coil and the intermediate portion
fixed to the frame of the damper base. The top of the arc defining the curved portion is shaped so
as to be positioned outside the jig insertion gap in the short diameter direction.
[0012]
Preferably, in the electrodynamic speaker according to the present invention, the damper
includes a plurality of elongated dampers spaced apart in the vibrating direction of the voice coil,
and the damper base fixes the plurality of elongated dampers respectively The elongated frames
of each of the plurality of damper bases are overlapped and connected.
[0013]
A method of manufacturing an electrodynamic speaker according to the present invention is a
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method of manufacturing an elongated electrodynamic speaker having a major axis direction and
a minor axis direction, wherein the elongated damper has a major axis direction and a minor axis
direction. Forming a fixing portion at the outer peripheral end in the major axis direction,
conducting one end of the tinsel cord through the voice coil, and fixing one end of the tinsel cord
to the bobbin of the voice coil, and A damper base having an elongated frame having a short
diameter direction is formed, and an inner side larger than a length between a long diameter side
frame portion to which a fixed portion of the damper is fixed and a short diameter side end
portion on both sides of the damper Securing the bobbin of the voice coil and the inner
peripheral end of the damper so as to form the dimensioned and separated short diameter side
frame, and disposing the voice coil in the magnetic gap of the magnetic circuit so as to be
vibratable And fix the fixed part of the damper on the damper base And, and a step of fixing the
damper base to the magnetic circuit, the intermediate portion of the tinsel wire, and fixing to the
frame of the damper base, a.
[0014]
Preferably, in the method of manufacturing an electrodynamic speaker according to the present
invention, in the step of fixing the middle part of the tinsel cord to the frame of the damper base,
the short diameter side frame part of the damper base and the short diameter side of the damper
The method further includes the step of defining a jig insertion gap for inserting a shaping jig for
shaping the tinsel wire between the end portion, and the shaping jig is inserted into the jig
insertion void and fixed to the voice coil of the tinsel wire Forming a curved portion to be shaped
by a shaping jig between the one end to be fixed and the intermediate portion fixed to the frame
of the damper base, and inserting the jig at the apex of the arc defining the curved portion
Shaping the tinsel wire and removing the shaping jig so as to be positioned on the outer side in
the minor axis direction than the air gap.
[0015]
Preferably, in the method of manufacturing an electrodynamic speaker according to the present
invention, the dampers include a plurality of elongated dampers provided apart in the vibrating
direction of the voice coil, and the damper base fixes the plurality of dampers respectively. And
including a plurality of damper bases, wherein the plurality of damper bases are connected by
overlapping the respective elongated frames.
[0016]
Hereinafter, the operation of the present invention will be described.
[0017]
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5
The electrodynamic speaker according to the present invention is a magnetic circuit, a speaker
diaphragm, or an electrodynamic loudspeaker whose frame has a major axis direction and a
minor axis direction, and the voice coil wound around a bobbin is magnetically A damper is
disposed movably in the magnetic gap of the circuit, a tinsel wire electrically connected to the
voice coil, and a damper base for fixing the damper to the magnetic circuit.
The damper is a slender frame having a major axis direction and a minor axis direction, and has a
fixed portion fixed to the damper base at an outer peripheral end in the major axis direction, and
has a slender frame body having a major axis direction and a minor axis direction. Is fixed to a
damper base having
Further, the damper base includes a long diameter side frame portion to which the fixed portion
of the damper is fixed, and a short diameter side frame portion having an inner dimension larger
than a length between the short diameter side ends on both sides of the damper And.
The major axis direction is the direction in which the major axis defining the elongated shape
including the rectangular, oval, elliptical, or track shape extends, and the minor axis direction is
the direction in which the minor axis orthogonal to the major axis extends It is.
[0018]
Specifically, the damper may include a plurality of elongated dampers spaced apart in the
vibrating direction of the voice coil, and the damper base fixes a plurality of elongated dampers
respectively. Each elongated frame of a plurality of damper stands may be piled up and
connected including a damper stand.
For example, the elongated damper is a double damper consisting of a front damper and a rear
damper in the front-rear direction in which the voice coil vibrates, and the damper base is a
rectangular frame shaped from resin. It is a body and each fixed part of a front side damper and
a rear side damper should just be fixed to a major axis side frame part of a damper stand fixed
corresponding to each.
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6
When the elongated frame bodies constituting the plurality of damper bases are overlapped and
connected, the fixed positions of the plurality of dampers with respect to the voice coil can be
determined, and the manufacturing process can be facilitated.
[0019]
Here, in the electrodynamic speaker having a slender shape in the short diameter direction
compared to the long diameter direction of the present invention, the tinsel wire is drawn out
from the long diameter direction of the damper, and the middle portion of the tinsel wire is the
tinsel wire of the frame of the damper base. It is fixed to the wire fixing part.
The tinsel wire, one end of which is fixed to the bobbin of the voice coil and the other end of
which is fixed to the terminal, becomes longer by being drawn out from the longer diameter
direction than when drawn out from the shorter diameter direction. By fixing the middle portion
to the frame, it is possible to prevent contact with the damper which is also long in the major axis
direction and other components.
Therefore, in the electrodynamic speaker according to the present invention, the tinsel cord does
not contact the speaker diaphragm or the like to generate noise.
[0020]
Further, in the electrodynamic speaker of the present invention, since the short diameter side
frame portions of the damper base are separated with an inner dimension larger than the length
between the short diameter side ends on both sides of the damper, A jig insertion gap for
inserting a shaping jig for shaping a tinsel wire is defined between the short diameter end of the
damper, and as a result, in the manufacturing process using the shaping jig, other component
parts can be easily obtained. The tinsel wire can be shaped to prevent contact.
That is, the curved portion is shaped with a shaping jig between one end fixed to the voice coil of
the tinsel cord and the intermediate portion fixed to the frame of the damper base, and the apex
of the arc defining the curved portion is By being positioned outside the jig insertion gap in the
minor axis direction, it is possible to prevent the tinsel wire from coming into contact with a long
damper in the major axis direction, a speaker diaphragm, or the like.
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[0021]
In the method of manufacturing an electrodynamic speaker according to the present invention,
the tinsel wire is shaped using a shaping jig, and the middle portion thereof is fixed to the frame
of the damper base. Even if the speaker diaphragm and damper of the above are used, the quality
is stabilized without the occurrence of rolling or the like in the vibration system.
Therefore, even in the case of an electrodynamic speaker in which a tinsel wire is drawn out in
the direction of the major axis of the damper, generation of abnormal noise can be suppressed,
and an electrodynamic speaker excellent in reproduction sound quality can be realized.
[0022]
Elongated electrodynamic speaker with a short diameter direction shorter than the long diameter
direction, even if the tinsel wire is drawn out from the long diameter direction of the damper, it is
easy to manufacture and no rolling etc. occur. It is possible to provide an electrodynamic speaker
which is stable in quality, and in which the tinsel wire does not contact the speaker diaphragm or
the like to generate abnormal noise.
[0023]
Elongated electrodynamic speaker with a short diameter direction shorter than the long diameter
direction, even if the tinsel wire is drawn out from the long diameter direction of the damper, it is
easy to manufacture and no rolling etc. occur. The purpose is to provide an electrodynamic
speaker in which the quality is stable and the tinsel wire does not contact the speaker diaphragm
or the like to generate abnormal noise, and has an elongated shape having a major axis direction
and a minor axis direction. The damper has a fixed portion fixed to the damper base at the outer
peripheral end in the long diameter direction, and the fixed portion of the damper is fixed to the
damper base having a slender frame having a long diameter direction and a short diameter
direction. A long diameter side frame portion and a short diameter side frame portion having an
inner dimension larger than the length between the short diameter side end portions on both
sides of the damper and separated, and the middle portion of the tinsel wire is the damper base It
was realized by being fixed to the frame.
[0024]
Hereinafter, an electrodynamic speaker according to a preferred embodiment of the present
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8
invention and a method of manufacturing the same will be described, but the present invention is
not limited to these embodiments.
[0025]
1 and 2 illustrate an electrodynamic speaker 1 according to a preferred embodiment of the
present invention.
FIG. 1A is a perspective view of the electrodynamic speaker 1 viewed from the front side, and
FIG. 1B is a perspective view of the electrodynamic speaker 1 viewed from the back side.
FIG. 2A is a cross-sectional view of the electrodynamic speaker 1 taken along the line O-A, and
FIG. 2B is a cross-sectional view of the electrodynamic speaker 1 taken along the line B-B '.
In addition, as described later, a part of the structure of the electrodynamic speaker 1, an internal
structure, and the like are omitted.
The direction in which the straight line (long axis) connecting the points O-A extends is the major
axis direction, and the direction in which the straight line (short axis) connecting the points O-B
extends is the short axis direction.
[0026]
The electrodynamic speaker 1 of this embodiment is a slender electrodynamic speaker having a
track-type speaker diaphragm 2 having a major axis length L1 of about 262.5 mm and a minor
axis length L2 of about 25.5 mm. Even if it is elongated, it is a speaker having a diaphragm area
equal to that of a circular diaphragm having a diameter of about 130 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. Further, the voice coil 4 is connected to the back side of the
speaker diaphragm 2 and is supported so as to be vibrated by the damper 5 (the front damper 5a
and the rear damper 5b). In the case of the present embodiment, the voice coil diameter of the
voice coil 4 is about 20 mm. The frame 6 has an elongated shape corresponding to the trackshaped speaker diaphragm 2, and the magnetic circuit 10 fixed to the frame 6 also has an
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9
elongated shape having a narrow width equal to or less than the minor axis length L2. 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.
[0027]
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 a bobbin 4a (not shown) constituting the voice
coil 4 is bonded to the central back surface. 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, a speaker diaphragm 2 having a rib is obtained by using a vacuum
forming method in which the extruded thermoplastic resin foam sheet (specifically,
polypropylene) is used in combination with plug assist molding. ing. That is, since the speaker
diaphragm 2 of the elongated shape in which the major axis length L1 and the minor axis length
L2 are significantly different is likely to be significantly affected by the divisional vibration in the
major axis direction, it has a rib extending in the major axis direction The radial cross-sectional
shape is substantially W-shaped, and the shape has rigidity in the major axis direction.
[0028]
In the present embodiment, the edge 3 is formed by injecting a flexible foam rubber into a mold
and performing heat foaming. A free edge is formed by a thin corrugation (or a roll) so as to
support the speaker diaphragm 2 freely on the long side of the track shape extending linearly in
the major axis direction of the speaker diaphragm 2, and is arced in the minor axis direction. In
the short side of the track shape, there is formed a thick, non-oscillating fixed edge 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 resin forming the loudspeaker diaphragm 2 in the major
axis direction Flexibility makes it possible to vibrate in bending.
[0029]
The voice coil 4 is formed of a bobbin 4a formed in a cylindrical shape, and a coil 4b (not shown)
wound around one end side and supplied with an audio current. The other end of the bobbin 4 a
on which the coil 4 b is not wound is connected to the center of the back surface of the speaker
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10
diaphragm 2 by an adhesive. The coil 4 b is disposed in a circular magnetic air gap 13 of the
magnetic circuit 10 described later. As will be described later, the tinsel wire 8 solders and
electrically connects the terminal 7 fixed to the frame 6 and the lead wire of the coil 7 from the
terminal 7 to supply an audio current to the coil 4b.
[0030]
The damper 5 is a two-stage damper including a front damper 5a and a rear damper 5b, and is a
long and thin shape by cutting a circular corrugation damper formed by impregnating a phenolic
resin with a flexible fiber woven fabric as a base material. (Track type). The inner peripheral ends
of the front damper 5a and the rear damper 5b are connected to the cylindrical outer surface
side of the bobbin 4a to support the rear central side of the speaker diaphragm 2. The outer
peripheral end sides of the front side damper 5a and the rear side damper 5b are fixed to the
fixing portion of the frame 6 via a damper base 9 composed of a front side damper base 9a and a
rear side damper base 9b described later. Damper 5 may be a corrugation damper having
another shape or may not be formed in two stages, and may be formed of another material, and
the inner ring and the outer ring are connected. Even in the case of a butterfly damper formed of
metal or resin, it has an elongated arm having a major axis direction and a minor axis direction,
and has a fixing portion fixed to the damper base at the outer peripheral end in the major axis
direction. It should be done.
[0031]
The frame 6 is an iron plate frame press-formed 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 And a connecting portion
connecting the fixing portions, a window defined between the plurality of connecting portions,
and a mounting hole for mounting the terminal 7. A damper base 9 for fixing the dampers 5a and
5b is fixed to the frame 6. Therefore, the speaker vibration system including the speaker
diaphragm 2, the edge 3, the voice coil 4, the damper 5, and the damper stand 9 is vibratably
supported with respect to the frame 6.
[0032]
The terminals 7 are provided in longitudinal directions in the elongated shapes of the speaker
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11
diaphragm 2, the damper 5 and the frame 6, and are attached to the mounting holes of the frame
6. The terminal 7 has positive and negative terminals fixed to the insulating base, and the
positive and negative terminals are soldered to the tinsel cords 8a and 8b drawn from the long
diameter direction of the damper 5, respectively. It is fixed. Further, as shown in the crosssectional view of FIG. 2A, in the tinsel cords 8a and 8b, an intermediate portion between the
voice coil 4 and the terminal 7 is fixed to the damper base 9a.
[0033]
The magnetic circuit 10 comprises an elongated top plate 11 fixed to the frame 6, a center pole
12 which is cylindrical and inserted in a circular hole formed at the center of the top plate 11,
and an elongated under plate 14. And two main magnets 15a and 15b magnetized in the same
direction. The top plate 11 and the center pole 12 form a circular magnetic air gap 13 having a
uniform width. The main magnets 15 a and 15 b are sandwiched between the top plate 11 and
the under plate 14, and are arranged symmetrically with the center pole 12 in between in the
major axis direction. The two main magnets 15 a and 15 b have a substantially elongated shape
corresponding to the shape of the elongated top plate 11 and the under plate 14, and the center
side close to the center pole 12 has the circular shape of the center pole 12. A recess is formed
that includes a corresponding cylindrical surface. The center pole 12 may be integrally formed
with the under plate 14, or another piece may be fixed by an adhesive.
[0034]
The two main magnets 15a and 15b of this embodiment are ferrite magnets, and may be Nd-Fe-B
rare earth magnets having larger residual magnetization and coercivity, smaller volume or strong
coercivity. The rare earth magnet is a Nd-Fe-B neodymium magnet or a Sm-Co samarium cobalt
magnet, and is a magnet having a large maximum energy product (BH) max of the magnet. The
magnetic circuit 10 is an external magnet type magnetic circuit in which a magnet is disposed
outside the area to be projected when the coil 4b of the voice coil 4 is viewed in a plan view, and
the main magnets 15a and 15b having high coercive force are in the major axis direction.
Because it is disposed in the above, it is suitable for an elongated speaker such as the
electrodynamic speaker 1 of the present invention. This is because if the maximum width of the
magnetic circuit 10 can be reduced, the magnetic circuit 10 fits within the area formed when the
elongated speaker diaphragm 2 is viewed from the front. Therefore, an efficient dynamic speaker
1 is realized including the adoption of a lightweight speaker diaphragm 2.
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12
[0035]
When a voice current is supplied to the coil 4b of the voice coil 4, a driving force acts on the
voice coil 4 disposed in the magnetic gap 13, and the voice coil 4 vibrates in the vertical
direction in FIG. The speaker diaphragm 2 also vibrates in the vertical direction. The speaker
diaphragm 2 flexibly supports the free edge portion of the edge 3 supporting the outer
peripheral end in the minor axis direction. On the other hand, in the major axis direction, the
bending vibration becomes possible due to the flexibility of the thermoplastic resin foam sheet
forming the speaker diaphragm 2, and the voice coil 4 is largely displaced at a frequency near or
lower than the lowest resonance frequency f0. The speaker diaphragm 2 to which both ends in
the major axis direction are fixed bends and deforms in an arc shape in the major axis direction.
[0036]
The two main magnets 15a and 15b are disposed in the major axis direction of the magnetic
circuit 10 of the present embodiment, while the magnet (magnet) for generating the magnetic
force is not disposed in the minor axis direction. 10 has an elongated shape overall, and has an
open window 16 communicating with the magnetic gap in the minor axis direction. The two main
magnets 15a and 15b are arranged symmetrically with the center pole 12 at the center of point
symmetry in the major axis direction, that is, with the center pole 12 in between, and the main
magnet 15a and the center pole 12 One main magnet 15b is arranged in the major axis direction.
When the magnetic circuit 10 is viewed from the side in the short diameter direction, the open
window 16 where the magnets 15a and 15b are not disposed is formed, and a hole is formed
such that the cylindrical side surface of the center pole 12 can be directly viewed. Specifically,
the open window 16 is defined by the top plate 11, the two main magnets 15 a and 15 b, and the
under plate 14. The open window portion 16 may be covered with a non-woven fabric having air
permeability so as to prevent foreign matter such as iron powder from invading the magnetic gap
13.
[0037]
In the magnetic circuit 10, even if the circular magnetic gap 13 has an equal width in the radial
direction, the magnetic flux density distribution is different in the major axis direction and the
minor axis direction, and the substantially cylindrical main magnets 15a and 15b; An extremely
strong magnetic flux density is generated in the major axis direction in which the circular
magnetic air gaps 13 are closest to each other, and the magnetic flux density in the major axis
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13
direction becomes higher than the magnetic flux density in the minor axis direction. Since the
magnetic flux density distribution in the circumferential direction in the circular magnetic gap 13
is different in the major axis direction and the minor axis direction, the driving force for driving
the speaker diaphragm 2 can also be different in the major axis direction and the minor axis
direction. The peak dip of the frequency characteristic can be reduced.
[0038]
FIG. 3 is a view for explaining the assembly parts of the vibration system of the dynamic speaker
1. As shown in FIG. That is, FIG. 3A is a perspective view of a pre-assembly including the voice
coil 4 constituting the vibration system of the electrodynamic speaker 1, the damper 5, the
damper stand 9, and the tinsel cord 8, 3 (b) is a plan view of this pre-assembly. In the process of
manufacturing the electrodynamic speaker 1, the vibration system pre-assembly is assembled on
a jig (not shown) and the vibration system pre-assembly is mounted on the frame 6 and the
magnetic circuit 10 which are bonded and fixed in advance. When the damper base 9 is fixed, the
coil 4 b can be disposed in the magnetic gap 13 of the magnetic circuit 10. Also, as described
above, the upper end of the bobbin 4 a is bonded to the central back surface of the speaker
diaphragm 2.
[0039]
In the present embodiment, since two front dampers 5a and two rear dampers 5b are used in
common, the description of the rear damper 5b common to the description of the front damper
5a is omitted. Of course, the front damper 5a and the rear damper 5b may have different
materials and stiffness. Similarly, in the present embodiment, since the front damper base 9a and
the rear damper base 9b use two common damper bases, the description of the rear damper base
9b common to the description of the front damper base 9a is as follows. I omit it.
[0040]
The cylindrical outer curved surface of the bobbin 4a of the voice coil 4 is fitted and bonded to
the inner diameter end of the front damper 5a and the rear damper 5b. Further, the elongated
front damper 5a and the rear damper 5b having the major axis direction and the minor axis
direction respectively have the fixing portion 5ax fixed to the front damper stand 9a and the rear
damper stand 9b at the outer peripheral end in the major axis direction. (Not shown) 5bx, each
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fixed by an adhesive. Then, by superposing and connecting the front damper stand 9 a and the
rear damper stand 9 b, a pre-assembled part of a vibration system of the dynamic loudspeaker 1
consisting of a double damper is configured.
[0041]
The front damper 5a and the rear damper 5b are formed by cutting a circular corrugation
damper having an outer diameter of about 60.0 mm into an elongated shape (track shape), so in
the plan view shown in FIG. 5 (b) As shown in the perspective view of FIG. 5A, unevenness of the
corrugation of the damper appears at the short diameter side end portions 5ay and 5by which
define the linear portion. The front damper stand 9a and the rear damper stand 9b are, for
example, elongated frames formed of an ABS resin and having a major axis direction and a minor
axis direction, and the fixing portion 5ax of the front damper 5a is fixed thereto. A long diameter
side frame portion 9 ax and a short diameter side frame portion 9 ay having an inner dimension
larger than the length between the short diameter side end portions 5 ay on both sides of the
front side damper 5 a are provided. For example, when the length between the short diameter
side end portions 5 ay on both sides of the front damper 5 a of the present embodiment (that is,
the width in the short diameter direction of the front damper 5 a) is about 26.0 mm, the front
damper stand 9 a The inner dimension of the short diameter side frame part 9ay which is
separated on both sides of is approximately 29.0 mm, which is larger than the short diameter
side end 5ay. Therefore, in this vibration system preassembly, a gap 20 having a width of 1.5 mm
is a short diameter between the short diameter side frame 9ay of the front damper stand 9a and
the short diameter end 5ay of the front damper 5a. It forms in the both sides of the front side
damper 5a along side edge part 5ay. As described later, this air gap 20 functions as a jig
insertion air gap 20 for inserting shaping jigs Jga and Jgb for shaping the tinsel cords 8a and 8b.
[0042]
In the vibration system pre-assembly shown in FIG. 3, the tinsel cords 8 a and 8 b conducted to
the coil 4 b of the voice coil 4 contact other components when assembled and operate as the
electrodynamic speaker 1. The middle portion is pre-shaped and fixed so as not to generate
sound. Specifically, the middle portions 8ax and 8bx of the tinsel cords 8a and 8b are fixed to the
tinsel cord fixing portion which is a plane formed on the long diameter side frame portion 9ax of
the front damper base 9a with an adhesive. The wires 8 a and 8 b are drawn out from the major
axis direction of the damper 5. Further, as shown in the drawing, the tinsel cords 8a and 8b are
fixed at one end fixed to the voice coil 4 by soldering and an adhesive, and an intermediate
portion fixed to the long diameter side frame 9ax of the front damper base 9a by an adhesive. It
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is shaped by a shaping jig so as to have a curved portion including arc apexes 8ay and 8by
between 8ax and 8bx. That is, the tinsel cords 8 a and 8 b are shaped such that the apexes 8 ay
and 8 by of the arc defining the curved portion thereof are located outside the jig insertion gap
20 in the short diameter direction. The terminal ends of the tinsel cords 8a and 8b are not
shown, and the tinsel cords 8a and 8b are respectively soldered to the positive and negative
terminals of the terminal 7 and fixed so as to be conductive. It is done.
[0043]
Therefore, not only is the method of manufacturing the electrodynamic speaker 1 simplified and
the number of man-hours reduced by using the pre-assembled parts of this vibration system, the
cost can be reduced, but the tinsel cords 8 a and 8 b Even if it is pulled out from the long
diameter direction, the quality is stable without the occurrence of rolling etc., and the generation
of abnormal noise is suppressed by preventing the tinsel wires 8a and 8b from coming into
contact with the speaker diaphragm 2 etc. be able to. The vibration system pre-assembly
supports the voice coil 4 vibratably on the inner peripheral side of the front damper 5a and the
rear damper 5b, and the outer peripheral sides of the front damper 5a and the rear damper 5b
are mutually connected. Since it is fixed to the front damper stand 9a and the rear damper stand
9b, the coil 4b in the magnetic gap 13 of the magnetic circuit 10 can vibrate stably, and further,
the tinsel cords 8a and 8b are other components. It is possible to vibrate so as not to touch the
[0044]
FIG. 4 is a view for explaining a part of a method of manufacturing a vibration system of the
electrodynamic speaker 1. FIG. 4 (a) is a cross-sectional view taken along the line A-A 'for
explaining the longitudinal cross section of the pre-assembly of the vibration system of the
electrodynamic speaker 1, and FIG. 4 (b) is a plan view of this pre-assembly It is a figure
containing shaping jigs Jga, Jgb, and Jgc which are used at a manufacturing process, respectively.
That is, in the method of manufacturing the elongated electrodynamic speaker 1, the elongated
speaker diaphragm 2 having the major axis direction and the minor axis direction and the edge 3
and one end of the tinsel cords 8a and 8b are electrically conducted to the coil 4b The
components such as the voice coil 4 fixed to 4a, the elongated damper 5 having a fixing portion
at the outer peripheral end in the long diameter direction, or the elongated frame 6 and the
damper base 9 having an elongated frame are manufactured respectively. In addition to the
above-described process, the process of assembling the vibration system pre-assembly described
below is included.
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16
[0045]
As shown in FIG. 4, the bobbin 4a of the voice coil 4 and the inner peripheral end of the front
damper 5a and the rear damper 5b are fixed with an adhesive, and the fixing portion 5ax of the
front damper 5a and the rear damper 5b (not shown ) 5bx is fixed to the long diameter side
frame portions 9ax and 9bx of the front side damper base 9a and the rear side damper base 9b
with an adhesive. The front damper stand 9a and the rear damper stand 9b are connected by
overlapping respective elongated frames. The tinsel wires 8a and 8b whose one end is fixed to
the bobbin 4a of the voice coil 4 are formed using the shaping jigs Jga and Jgc crossing each
other and the shaping jigs Jgb and Jgc crossing each other. After being shaped into a shape along
the set of tools, the intermediate portions 8ax and 8bx are fixed to the long diameter side frame
portion 9ax of the front damper base 9a with an adhesive.
[0046]
The shaping jigs Jga and Jgb are thin round bars, and are inserted into jig insertion gaps 20
formed on both sides of the front damper 5a along the short diameter end 5ay. That is, the
shaping jigs Jga and Jgb have a diameter substantially equal to the width of the jig insertion gap
20, and the tinsel wires 8a and 8b are provided outside of the jig insertion gap 20 in the short
diameter direction. It is possible to form a curve comprising the apexes 8ay and 8by of the
located arc. On the other hand, the shaping jig Jgc is a rod-like member having a substantially
rectangular cross section and is mounted on the upper surface side of the front damper 5a to
separate the front damper 5a from the tinsel cords 8a and 8b. Therefore, the tinsel cords 8a and
8b are drawn out in the major axis direction so as to wrap around the upper sides of the shaping
jigs Jgc that are outside the shaping jigs Jga and Jgb, respectively, and the middle portions 8ax
and 8bx The curved portion which is fixed to the long diameter side frame 9ax of the damper
base 9a with an adhesive and as a result has a bulge on the side of the speaker diaphragm 2 and
bulges outward in the minor diameter direction than the jig insertion gap 20 In this case, the
apexes 8 ay and 8 by of the arc of the curved portion are shaped so as to be located outside the
jig insertion gap 20 in the short diameter direction.
[0047]
When securing middle portions 8ax and 8bx of tinsel cords 8a and 8b to long-diameter side
frame 9ax of front damper base 9a with an adhesive, using notches (not shown) for temporarily
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fixing tinsel cords 8a and 8 It is also good. The notch may be provided in the long diameter side
frame portion 9 ax of the front damper base 9 a, and the tinsel cords 8 a and 8 b may be hooked
and pulled out from the long diameter direction of the damper 5. The shaping jigs Jga, Jgb and
Jgc may be removed when the adhesive for fixing the middle portions 8ax and 8bx of the tinsel
wires 8a and 8b is solidified, but the tinsel wires 8a and 8b may be temporarily In the case of
fixing, the shaping jig can be removed quickly when the adhesive is partially solidified.
[0048]
After removing the shaping jigs Jga, Jgb and Jgc, the tinsel cords 8a and 8b are shaped so as not
to contact other components including the front damper 5a. Therefore, the pre-assembly part of
the vibration system of the electrodynamic speaker 1 in which the middle parts 8ax and 8bx of
the tinsel cords 8a and 8b are fixed to the long diameter side frame 9ax of the front damper
stand 9a with an adhesive is the rear damper stand 9b. By fixing the frame 6 to the magnetic
circuit 10 to which the frame 6 is fixed, the coil 4 b of the voice coil 4 can be easily disposed in
the magnetic gap 13.
[0049]
Of course, when the voice coil 4 is disposed in the magnetic gap 13, a voice coil holder which is a
jig to be inserted into the magnetic gap 13 may be used in combination. A voice coil 4 including
tinsel cords 8a and 8b using a voice coil holder for the magnetic circuit 10 to which the frame 6
is fixed other than the case where the pre-assembly parts are preliminarily assembled separately
from the magnetic circuit 10 The rear side damper base 9b and the rear side damper 5b, the
front side damper base 9a and the front side damper 5a may be assembled in order to shape the
tinsel cords 8a and 8b.
[0050]
The shaping jigs Jga and Jgb are not limited to the members having the above-mentioned shape,
and a shape in which the apexes 8ay and 8by of the arcs of the curved portions of the tinsel
cords 8a and 8b are positioned outside the jig insertion gap 20 in the short diameter direction As
long as it can be inserted into the jig insertion gap 20, it is sufficient. Further, the jig insertion
gaps 20 formed on both sides of the front damper 5a are not limited to the case where they are
linear depending on the shape of the front damper 5a. The short diameter side frame portion 9ay
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of the front damper table 9a may have a fitting portion that defines the insertion position of the
shaping jigs Jga and Jgb. The shaping jig Jgc is not required to be separated from the shaping
jigs Jga and Jgb as long as the curved portions of the tinsel cords 8a and 8b can be shaped in
three dimensions and can be easily inserted or removed.
[0051]
The electrodynamic speaker 1 of the present embodiment may have dampers of different
dimensions corresponding to other voice coil diameters. In addition, the electrodynamic speaker
1 is not limited to the track-type speaker diaphragm, but it is an elongated electrodynamic
speaker having a large ratio of major axis dimension to minor axis dimension such as oval,
oblong, rectangular, or rectangular. Good.
[0052]
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, since the electrodynamic speaker of the present
invention can realize a speaker system that reproduces audio in a narrow and thin cabinet with a
narrow overall width, it is particularly suitable for a vehicle speaker having a limited installation
space.
[0053]
It is a figure explaining the electrodynamic-type speaker 1 by preferable embodiment of this
invention. (Example 1) A diagram illustrating an electrodynamic speaker 1 according to a
preferred embodiment of the present invention. (Example 1) It is a figure explaining the assembly
part of the vibration system of the electrodynamic-type speaker 1 by preferable embodiment of
this invention. (Example 1) It is a figure explaining a part of manufacturing method of the
vibration system of the electrodynamic speaker 1 by preferable embodiment of this invention.
Example 1
Explanation of sign
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[0054]
Reference Signs List 1 electrodynamic speaker 2 speaker diaphragm 3 edge 4 voice coil 5a front
damper 5b rear damper 6 frame 7 terminal 8a, 8b tinsel wire 9a front damper base 9b rear
damper base 10 magnetic circuit 11 top plate 12 center pole 13 magnetic Air gap 14 Under
plate 15a, 15b Main magnet 16 Open window 20 Jig insertion air gap Jga, Jgb, Jgc Shaping jig
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