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JP2013021469

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DESCRIPTION JP2013021469
Abstract: PROBLEM TO BE SOLVED: To provide a high efficiency speaker with high reproduction
sound pressure level by reducing the time and effort of manufacturing. SOLUTION: A magnetic
circuit 10 is accommodated in a frame 5 and has parallel parallel linear and open magnetic gaps
17a and 17b, and an elongated vibration supported by the frame 5 and having a longitudinal
direction and a lateral direction. An elongated coil bobbin 6 fixed to the plate 2 and the
diaphragm 2 and having a plane perpendicular to the vibration direction of the diaphragm has a
longitudinal direction and a lateral direction, and opposing sides parallel to each other, and the
coil bobbin In the speaker provided with the voice coil 7 wound around, the coil bobbin 6 is
arranged such that the linear intermediate portion is disposed in the magnetic gap of the
magnetic circuit, while the both ends 19 are located outside the magnetic gap. A thin plate-like
support member 8 is provided which is disposed and connected to lower portions 19 of the coil
bobbin and the frame 5 to support the coil bobbin 6. [Selected figure] Figure 2
スピーカ
[0001]
The present invention relates to an elongated speaker such as a track shape, and more
particularly to a speaker that is excellent in sound reproduction capability and is suitable for
electronic devices such as thin televisions and displays.
[0002]
In an apparatus such as a thin display to which a speaker for reproducing sound is attached, it is
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desired to reduce the area other than the display portion, and there is also a demand for
downsizing of the space required to attach the speaker.
In particular, an elongated (rectangular, oval (elliptical, track-shaped)) speaker can be suitably
used for these devices because of its shape. However, the elongated speaker has a limited
diaphragm area in the short direction, and the effect of divided vibration unique to the elongated
speaker diaphragm is large, making it difficult to obtain flat reproduction sound pressure
frequency characteristics. There are disadvantages in sound reproduction capability for reasons.
Therefore, in order to solve these problems, various speakers as shown below have been
proposed conventionally.
[0003]
For example, in a track-type speaker in which the longitudinal and lateral dimensions of the
speaker shape are the longitudinal side and the short side, the magnet constituting the magnetic
circuit has a large shape within a range substantially falling within the speaker outer shape, and
the magnetic circuit is configured. As for the shape of the voice coil, there is known a track type
speaker having an elongated shape extending along the direction of the longitudinal side (Patent
Document 1).
[0004]
In addition, a magnetic circuit in which at least two rod-like magnets are held in parallel by an
upper plate and a lower plate across a rod-shaped center pole portion provided on the lower
plate, a frame coupled to the magnetic circuit, and There is a speaker comprising a diaphragm
coupled to an outer peripheral portion of a frame and a voice coil coupled to the diaphragm and
a part of which is disposed in a magnetic gap of the magnetic circuit (Patent Document 2).
[0005]
However, in the case of a long and thin speaker having a short direction as compared with the
longitudinal direction, the voice coil length intersecting the magnetic flux is increased by forming
the magnetic gap of the magnetic circuit and the voice coil including two sides in the longitudinal
direction. By increasing the driving force generated in the voice coil, a speaker with high
efficiency can be realized.
On the other hand, when the length of the voice coil intersecting the magnetic flux is increased,
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the size of the bobbin around which the elongated coil is wound increases, so that the strength of
the speaker, particularly the diaphragm supporting the voice coil and the edge tend to be
insufficient.
For this reason, the strength is required for the material of the diaphragm supporting the voice
coil, distortion of the sound is easily generated during the reproduction operation, and the
reproduction sound pressure level is lowered, and the efficiency is deteriorated. .
[0006]
In order to solve this problem, as shown in Patent Document 3 and Patent Document 4, as shown
in FIG. A speaker with an increased playback sound pressure level is also disclosed.
[0007]
JP-A-2000-197190 JP-A-2004-266337 JP-A-2006-311174 JP-A-2011-10167
[0008]
However, in a speaker in which voice coils are installed at a plurality of locations of the
diaphragm, the labor for wiring the plurality of voice coils is large, and there is a problem that
the manufacturing cost is increased.
Further, since the plurality of voice coils 102 move independently, a large driving force is applied
to the portion where the voice coil 102 is provided, as shown by the arrow 90 in FIG. There is a
problem that, for example, resonance occurs as a whole of the diaphragm and the divided
resonance modes of the diaphragm are easily generated.
For this reason, the length of the diaphragm is substantially limited, and it has been difficult to
realize an elongated speaker having a large ratio of the long side to the short side.
[0009]
Further, in order to reduce the problem of the occurrence of the split resonance mode, in order
to configure the diaphragm to be strong, as disclosed in Patent Document 4, means such as
providing a reinforcing member to the diaphragm is taken. However, all of these configurations
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increase the weight of the diaphragm, which causes a problem of causing a decrease in
reproduced sound pressure level.
[0010]
Therefore, the technical problem to be solved by the present invention is to provide an elongated
speaker which can reduce the manufacturing time and realize high efficiency with high
reproduced sound pressure level.
[0011]
The present invention provides a speaker having the following configuration in order to solve the
above technical problems.
[0012]
According to a first aspect of the present invention, there is provided a magnetic circuit housed
in a frame and having parallel parallel linear open-ended magnetic gaps, and an elongated
vibration supported in the frame and having a longitudinal direction and a lateral direction. An
elongated coil bobbin fixed to the diaphragm, having a plane perpendicular to the vibration
direction of the diaphragm having a longitudinal direction and a lateral direction, and opposing
surfaces facing the lateral side being parallel to each other; In the speaker provided with the
voice coil, the coil bobbin is disposed such that a linear intermediate portion is disposed in the
magnetic gap of the magnetic circuit, and both ends are positioned outside the magnetic gap,
According to another aspect of the present invention, there is provided a speaker including a
support member connected to the lower ends and the frame and supporting the coil bobbin.
[0013]
According to a second aspect of the present invention, the coil bobbin has bottom walls at the
both ends, and the support member is connected to the bottom wall and the inner bottom surface
of the frame. Provide a speaker.
[0014]
According to a third aspect of the present invention, there is provided the speaker of the first or
second aspect, wherein the coil bobbin has a track shape.
[0015]
According to a fourth aspect of the present invention, there is provided the speaker according to
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any one of the first to third aspects, wherein the coil bobbin is provided with deformation
preventing ribs all around the side wall.
[0016]
According to a fifth aspect of the present invention, any one of the first to fourth aspects,
wherein the coil bobbin is provided with a diaphragm attachment portion for supporting a
diaphragm disposed so as to be fitted, on an inner surface. Provide one speaker.
[0017]
According to the sixth aspect of the present invention, the support member has a thin plateshaped outer portion and an inner portion concentric with the outer portion, and the inner
portion is a main surface of the outer portion. The speaker according to any one of the first to
fourth aspects is characterized in that it is configured to be displaced in a direction.
[0018]
According to a seventh aspect of the present invention, any one of the first to sixth aspects,
wherein the support member has a pleat connecting the disk-like outer portion and the inner
portion provided concentrically. Provide one speaker.
[0019]
According to the eighth aspect of the present invention, a plurality of the magnetic circuits are
intermittently provided, and a surface of the coil bobbin is opposed in a lateral direction to a
portion where the gaps of the plurality of magnetic circuits are provided. A speaker according to
any one of the first to seventh is provided, which comprises a reinforcing member connecting the
two.
[0020]
According to the present invention, the magnetic gap of the magnetic circuit can be made into a
simple configuration by forming linear gaps parallel to each other with both ends open, and since
the gap adjustment with the voice coil is easy, manufacturing is possible. The process can be
facilitated.
Furthermore, by setting the coil bobbin to have an elongated shape in which the surfaces facing
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in the short direction are parallel, the driving force can be transmitted widely and uniformly to
the diaphragm, and the vibration linearity of the diaphragm can be increased. The occurrence of
the split resonance mode can be suppressed.
[0021]
Further, in the speaker having the elongated diaphragm, since the length of the voice coil
intersecting the magnetic flux can be increased by making the coil bobbin elongated, the driving
force generated by the voice coil can be increased.
Furthermore, by supporting the lower end portions of the coil bobbin by the support member,
the distance between the diaphragm supporting the coil bobbin and the support member can be
increased.
Therefore, the stability of the vertical vibration of the diaphragm can be improved.
Thus, the height dimension of the speaker can be reduced.
Therefore, according to the present invention, it is possible to provide a speaker that can be
easily manufactured while having high sound level and input resistance.
[0022]
According to the second aspect of the present invention, since the coil bobbin and the support
member can be easily fixed and the coil bobbin can be reinforced, the speaker can be
miniaturized by reducing the thickness and weight of the coil bobbin. can do.
[0023]
According to the sixth aspect of the present invention, by using the thin-plate shaped support
member, the mounting space of the support member provided on the lower side of the coil
bobbin can be reduced, and the height dimension of the speaker can be reduced. .
[0024]
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According to the fourth and fifth aspects of the present invention, the deformation of the coil
bobbin can be prevented by the deformation preventing rib and the diaphragm fitted into the
inside, and the assembling accuracy of the speaker can be improved. .
[0025]
According to the seventh aspect of the present invention, by using a disk-shaped support
member having concentric pleats, it is possible to support the force from any direction along the
main surface and to be orthogonal to the main surface The direction of movement does not
impede the movement of the diaphragm.
Thus, the coil bobbin can be efficiently supported.
[0026]
According to the eighth aspect of the present invention, since the deformation of the linear
portion of the coil bobbin can be reduced, the positioning accuracy of the magnetic gap can be
enhanced, and the coil bobbin has a long longitudinal direction with respect to the short side
direction. Can also be a speaker with high input tolerance.
[0027]
It is a perspective view showing the appearance composition of the speaker concerning the
embodiment of the present invention.
It is an assembly disassembled perspective view of the speaker of FIG.
It is sectional drawing in the AA of the speaker of FIG.
It is sectional drawing in the BB line of the speaker of FIG.
It is sectional drawing in the CC line of the speaker of FIG.
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It is sectional drawing in the DD line of the speaker of FIG.
It is sectional drawing in the EE line of the speaker of FIG.
It is a speaker partial enlarged view of FIG.
FIG. 3 is a partial enlarged cross-sectional view of FIG. 2;
It is a figure which shows typically the structure of the diaphragm used for the conventional
speaker. It is a figure which shows typically generation | occurrence | production of the division |
segmentation vibration of the diaphragm in the conventional speaker.
[0028]
Hereinafter, a speaker according to an embodiment of the present invention will be described
with reference to the drawings.
[0029]
FIG. 1 is a perspective view showing an appearance of a speaker according to an embodiment of
the present invention.
FIG. 2 is an exploded view of the speaker of FIG. The speaker 1 of the present invention is a
speaker mounted on an electronic device such as a flat-screen TV, a notebook computer, and the
like for which a reduction in the mounting space is required.
[0030]
The speaker 1 of this embodiment has an elongated shape with a longitudinal length L1 of about
100 mm and a short side length L2 of about 15 mm, and the diaphragm 2 is provided on the top
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surface of the frame 5 accommodating the magnetic circuit and the like. The diaphragm 2 has a
track shape in which the sides in the short direction are configured to be parallel to each other,
and both longitudinal end portions are configured to be semicircular.
[0031]
The edge 3 is bonded to the outer peripheral end of the diaphragm 2, and the upper frame 4 is
provided on the outer peripheral side of the edge 3. The upper frame 4 is formed in an elongated
shape corresponding to the track-shaped diaphragm 2.
[0032]
In the present embodiment, the edge 3 is formed of a flexible material, and for example, foamed
rubber is suitably used. It supports the entire circumference of the diaphragm 2 including the
track-shaped long side linearly extending in the longitudinal direction of the diaphragm 2 and the
track-shaped short side which is arc-shaped in the short direction. The diaphragm 2 is flexibly
supported by the edge 3 and is integrally and vertically oscillatably supported.
[0033]
The vibrating plate 2 and the elongated frame 5 corresponding to the shape of the vibrating plate
are connected via the edge 3. The magnetic circuit 10 and the like are accommodated in the
frame 5.
[0034]
Further, as shown in FIG. 2, a track-shaped coil bobbin 6 is provided on the back surface of the
diaphragm 2. The voice coil 7 is wound around the entire circumference of the side wall 6 a of
the track-shaped coil bobbin 6 to which the audio current is supplied. The coil bobbin 6 is
configured to substantially conform to the outer diameter of the diaphragm.
[0035]
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The frame 5 is an elongated box-like shape having an upper opening corresponding to the shape
of the diaphragm 2, and engages with the upper frame 4 at the opening. The frame 5 is
manufactured by insert molding the yoke of the magnetic circuit 10, and the diaphragm fixing
portion 11 which engages the diaphragm 2, the yoke fixing portion 12 which fixes the yoke of
the magnetic circuit 10, and the support member 8 A support member arrangement portion 13
to be arranged is provided.
[0036]
The diaphragm fixing portion 11 is a step provided on the inner side surface of the side wall 51
of the frame 5, and the diaphragm is disposed at a specific position by locking the upper frame 4.
Therefore, in the coil bobbin 6 provided on the diaphragm 2, the reference position in the frame
5 is determined uniformly in the normal state.
[0037]
The yoke fixing portion 12 for fixing the magnetic circuit 10 at a specific position is a wall-like
member provided in parallel to the side wall 51 of the frame 5 and guides between the side wall
of the frame and the yoke fixing portion as described later. The groove 53 is formed.
[0038]
FIG. 3 is a cross-sectional view of the speaker of FIG. 1 taken along line AA.
FIG. 4 is a cross-sectional view of the speaker of FIG. 1 taken along the line B-B. FIG. 5 is a crosssectional view of the speaker of FIG. 1 taken along the line C-C. 6 is a cross-sectional view of the
speaker of FIG. 1 taken along line D-D. FIG. 7 is a cross-sectional view of the speaker of FIG. 1
taken along the line E-E.
[0039]
As shown in FIGS. 3 and 5, the magnetic circuit 10 fixed to the yoke fixing portion 12 includes an
elongated yoke 14 fixed to a specific location of the frame 5, and a magnet 15 disposed at the
bottom of the yoke 14. , And a pole 16 provided on the magnet.
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10
[0040]
The yoke 14 is made of magnetic metal having a U-shaped cross section, and the magnet 15 is
disposed on the bottom surface.
The elongated magnet 15 has an outer shape elongated in the longitudinal direction of the frame
5, and the pole 16 also has a substantially elongated shape corresponding to the shape of the
magnet 15. Two magnets 15 and poles 16 are disposed in the yoke 14 with a gap 15 a
therebetween. The reinforcing member 20a of the coil bobbin 6 described later is located in the
gap 15a.
[0041]
Between the long side of the yoke 14 and the long side of the pole 16, linear magnetic gaps 17a
and 17b having two sides parallel to each other and having an equal width are formed. The
magnetic gaps 17a and 17b are open at both ends, and the width dimension is configured to be
about several mm although a slight difference may be seen depending on the size of the speaker.
[0042]
The magnet 15 of this embodiment uses a Nd-Fe-B rare earth magnet having high residual
magnetization and coercivity and high coercivity even in a small volume, but is not particularly
limited, and is a ferrite magnet It is also good. 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.
[0043]
The coil bobbin 6 provided on the diaphragm 2 is an annular cylindrical body substantially along
the outer frame shape of the diaphragm, and can be manufactured by press-forming a light metal
such as duralmin or aluminum, a heat-resistant resin film, etc. . In the present embodiment, an
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aluminum pressed product having a large heat dissipation effect is used. As shown in FIG. 6, the
coil bobbin 6 is formed in a track shape in which an intermediate portion is a straight portion 18
and both ends 19 have a semicircular shape. The two opposing surfaces of the coil bobbin 6
constituting the linear portion 18 in the short direction are parallel to each other.
[0044]
As shown in FIG. 6, a portion of the linear portion 18 is disposed in the magnetic gaps 17 a and
17 b of the magnetic circuit 10, while both ends 19 are disposed outside the magnetic gaps 17 a
and 17 b of the magnetic circuit 10. By arranging only the linear portion 18 in the opposing
magnetic gap of the magnetic circuit 10, the positional relationship between the magnetic gaps
can be facilitated by the widths of the yoke 14 and the magnet 15. Furthermore, the yoke fixing
portion 12 makes the frame Since the attachment position in the lateral direction of the magnetic
circuit 10 in 5 can be uniformly determined, the position in the lateral direction of the voice coil
7 in the magnetic gaps 17a and 17b can be performed with high accuracy. it can.
[0045]
Further, since the linear portions 18 and the magnetic gaps 17a and 17b of the coil bobbin 6 are
configured in parallel to each other, some relative positional relationship between the magnetic
circuit 10 and the voice coil 7 in the longitudinal direction is allowed to deviate.
[0046]
As shown in FIGS. 6 and 7, the coil bobbin 6 is provided with a reinforcing member 20 a at the
center.
The reinforcing member 20 a connects the lower ends of two opposing middle portions in order
to prevent the deformation of the track-shaped coil bobbin 6. As described above, since the
magnet 15 and the pole 16 are divided into two parts, the reinforcing member 20 a is disposed
in the gap 15 a between the two magnets 15 and the pole 16.
[0047]
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12
Further, as shown in FIG. 8, the coil bobbin 6 is provided with a voice coil locking portion 31 and
a reinforcing rib 33 all around the outer wall 30. The voice coil 7 formed by being wound around
in the form of a track is inserted into the voice coil locking portion 31 and abutted against the
step 32 at the upper end, so that the position of the sticking position can be aligned.
[0048]
A diaphragm attachment portion 34 is provided on the entire inner wall of the coil bobbin 6
along the entire circumference of the side wall, and the diaphragm 2 inserted from the upper end
side of the coil bobbin 6 is abutted and positioned. As described above, the opening of the coil
bobbin 6 and the diaphragm 2 have the same shape, and by inserting the diaphragm 2 into the
diaphragm attachment portion 34, deformation of the side wall upper end side of the coil bobbin
6 can be prevented.
[0049]
The deformation of the linear portion 18 of the coil bobbin 6 is prevented by the reinforcing rib
33 provided on the outer side wall 30, the diaphragm attachment portion 34 provided on the
upper end, and the reinforcing member 20a provided at the lower center of the coil bobbin 6. it
can.
[0050]
When the diaphragm 2 is attached to the coil bobbin 6, as shown in FIG. 8, the upper surfaces 2a
and 6a of the both are configured to have substantially the same height, and the edge 3 is formed
on the upper surfaces 2a and 6a of the diaphragm 2 and the coil bobbin 6. By bonding, strength
can be obtained.
[0051]
FIG. 9 is a partially enlarged partial sectional view of the vicinity of both ends of the coil bobbin.
A thin plate-like support member 8 is provided below the coil bobbin 6 at both ends and fixed to
the frame 5 as described later, and supports the coil bobbin 6 from the lower side.
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In the present embodiment, a disk-shaped support member 8 having substantially the same size
as the semicircular shape at both ends of the coil bobbin is used.
[0052]
As shown in FIG. 9, the bottom plate 20 is provided at both ends of the coil bobbin 6, and is
connected to the end of the surface facing in the lateral direction and the semicircular curved
surface. A projecting portion 21 is provided on the lower surface of the bottom plate 20. The
projecting portion 21 extends downward and is inserted into the fixing hole 22 of the support
member 8 to fix the support member 8.
[0053]
The support member has a configuration in which the outer peripheral portion and the inner
peripheral portion having substantially the same shape are disposed at concentric positions, and
connects the outer peripheral portion and the inner peripheral portion so that they can move in
the thickness direction.
[0054]
In the present embodiment, the support member 8 is formed of a disc-shaped cloth-formed
product, and the flange 24 located at the outermost periphery by the pleat 23 having a
concentric inner portion having the fixing hole 22 provided at the center. And connected.
The protruding portion 21 is inserted through the fixing hole 22 and connected to the coil
bobbin, and the flange 24 is fixed to the support member disposition portion 13 of the frame 5.
[0055]
The support member disposition portion 13 of the frame 5 has a central portion in order to
prevent interference between the projecting portion 21 of the coil bobbin 6 and the frame 5 and
to open the lower portion of the support member to ensure smooth movement of the coil bobbin
6. The through hole 54 is provided in the
[0056]
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The support member 8 deforms the pleats 23 to absorb displacement in the height direction of
the flange 24 and the fixing hole 22 when a force in a direction crossing the surface is applied.
In addition, the support member 8 does not need to be comprised with a cloth molded article, for
example, a metal etc. can be used.
[0057]
The positional relationship between the support member 8 and the coil bobbin 6 is arranged
such that the support member 8 supports the coil bobbin 6 from the lower side in a steady state.
In addition, since the support member 8 is provided with the pleats 23 in a concentric shape, the
support member 8 can exert a supporting force with respect to stress from any direction along
the surface, for example, the diaphragm 2 faces the front. Even if the speaker 1 is laid and laid as
described above, the coil bobbin 6 can be supported.
[0058]
When the speaker 1 is used, the support member 8 is deformed with the vibration of the coil
bobbin 6. As described above, the upper end of the coil bobbin 6 is fixed to the diaphragm 2, and
the lower end is supported by the support member 8. Therefore, the distance between the
support portions is wide, and stable vertical vibration can be secured. Moreover, since the height
of the coil bobbin 6 can be reduced while securing stable vertical vibration, the thickness
dimension of the speaker can be reduced.
[0059]
With the above configuration, the coil bobbin 6 is supported from above and below by the
diaphragm 2 and the support member 8, and the stress applied to the diaphragm 2 is reduced.
Therefore, even if the coil bobbin 6 is made large to increase the sound pressure level, the stress
applied to the diaphragm 2 is reduced, so the diaphragm can be made thinner and lighter.
Therefore, in addition to the improvement of the sound pressure level by the large sized coil
bobbin 6, the improvement of the sound pressure level accompanying weight reduction of a
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diaphragm is realizable.
[0060]
The lead wire 7a of the voice coil 7 starts from the vicinity of the both ends 19 as described later,
passes through the guide groove 53 of the lead wire 7a provided along the side wall 51 of the
frame 5, and the outside of the frame 5 from the insertion hole 52 Drawn out.
[0061]
The lead wire 7 a drawn to the outside of the frame 5 from the insertion hole 52 provided in the
side wall 51 of the frame 5 reaches the terminal plate 9 provided on the outside of the side wall
51.
For this reason, most of the lead wires 7a are concealed and can not be visually recognized from
the outside, and they do not break in contact with other members.
[0062]
As described above, according to the speaker according to the embodiment of the present
invention, the coil bobbin 6 is supported so as to be held between the support member 8 and the
diaphragm 2, so even if the coil bobbin 6 is enlarged, The level of the reproduction sound
pressure can be increased because the reinforcement is less. Moreover, since the coil bobbin 6
can be enlarged, the vibration linearity of the diaphragm 2 can be improved.
[0063]
Further, in the speaker having the track-shaped diaphragm, since the voice coil length
intersecting the magnetic flux can be made long by making the coil bobbin elongated, the driving
force generated by the voice coil can be increased.
[0064]
The present invention is not limited to the above embodiment, and can be practiced in various
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other aspects.
For example, the connection structure between the coil bobbin 6 and the support member 8 can
be widely applied as long as a thin plate-like support member is attached to lower end portions
of the coil bobbin.
[0065]
The shape and material of the support members provided at the lower end portions of the coil
bobbin 6 are not particularly limited as long as they are thin plates, and may be, for example,
rectangular.
[0066]
The speaker of the present invention can be used for a relatively small electronic device, and can
prevent breakage of the lead wire, thereby providing an electronic device having excellent
durability.
[0067]
Reference Signs List 1 speaker 2 diaphragm 3 edge 4 upper frame 5 frame 6 coil bobbin 7 voice
coil 8 support member 10 magnetic circuit 11 diaphragm fixing portion 12 yoke fixing portion
13 support member disposition portion 14 yoke 15 magnet 16 pole 17a, 17b magnetic gap 18
straight Section 19 end 20 bottom plate 20a reinforcing member 21 projecting portion 22 fixing
hole 23 pleat 24 flange
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